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PDS_VERSION_ID      = PDS3                                            
RECORD_TYPE         = STREAM                                          
OBJECT              = TEXT                                            
  PUBLICATION_DATE    = 1992-04-01                                    
  NOTE                = "DSN Software Interface Specification for     
                         Radio Science Open-Loop Data (ODR). Adapted  
                         from a version provided by PDS PPI Node.     
                         Formatted for 58 lines/page with constant    
                         width characters."                           
END_OBJECT          = TEXT                                            
END                                                                   
                                                                      
                        DOCUMENT 820-13; REV. A                       
                        DSN SYSTEM REQUIREMENTS                       
                       DETAILED INTERFACE DESIGN                      
----------------------------------------------------------------------
                               RSC-11-11                              
                       DSN RADIO SCIENCE SYSTEM                       
                    ORIGINAL DATA RECORD (ODR) AND                    
                      ORIGINAL DATA STREAM (ODS)                      
           (Insert this module in Document 820-13; Rev. A.)           
                                                                      
EFFECTIVE DATE: October 1992          EFFECTIVE SERVICE: Mars Observer
 Initial Release Date: April 1, 1992                                  
 NOTE: This module supersedes RSC-11-1OA.                             
                                                                      
Approved by:                                                          
                                                                      
  s/Jay A. Holladay       (SFOC)       s/S. Dolinsky            (430) 
  ------------------------------       ------------------------------ 
                                       s/Eric Nicolich                
  s/Michael J. Connally     (MO)         for Steve Silverman     (368)
  ------------------------------       ------------------------------ 
                                                                      
                                        s/Gene Winn             (440) 
                                        ----------------------------- 
                                                                      
Prepared by:                                                          
                                                                      
  s/Eric Nicolich                                                     
  ------------------------------                                      
                                                                      
A.    PURPOSE                                                         
                                                                      
      1.    Purpose and Scope                                         
                                                                      
      This interface module defines and controls the format of the    
Radio Science Original Data Record (ODR) and Original Data Stream     
(ODS).  This stream is composed of records generated by the Spectrum  
Processing Assembly (SPA) of the DSCC Spectrum Processing Subsystem   
(DSP), using the Radio Science software of the DSP, which is          
designated SPA-R.  Additionally, this module details the standard     
format data unit (SFDU) header used in transmitting the Radio         
Science ODS records in real time to the Space Flight Operations       
Center (SFOC).                                                        
                                                                      
                               NOTE                                   
                                                                      
      This module is generated by SPA-R software versions             
      beginning with OP-F as of the effective date stated             
      above.  Versions OP-A, OP-B, and OP-C generated the             
      ODR format defined in Module RSC-11-1O.  Versions OP-D          
      and OP-E generated the format defined in Module                 
      RSC-11-1OA.                                                     
                                                                      
      2.    Applicable Documents                                      
                                                                      
            The interface requirements established in this module     
were derived from guidelines and criteria contained in the following  
documents:                                                            
                                                                      
     820-13 (RSC-6-19)     Network-Level data Flow Standard           
                                                                      
     820-13 (GCF-1O-11)    SFOC/GCF Interface Agreement               
                                                                      
     820-13 (RSC-11-4A)    Wideband GCF Radio Science Playback Blocks 
                           and DSN Radio Science System Interface     
                                                                      
     820-13 (IDR-12-1A)    DSN Interfaces - IDR Formats (Mark IVA)    
                                                                      
     890-201               Network-Level Data Flow Standard           
                                                                      
B.    REVISION AND CONTROL                                            
                                                                      
      Revisions or changes to the information herein presented may    
be initiated according to the procedures in Section I (Introduction)  
of this document.                                                     
                                                                      
C.    GENERAL INFORMATION                                             
                                                                      
      The DSP-R is a computer-controlled subsystem that digitally     
samples a received spacecraft signal through the use of four analog-  
to-digital (A-D) converters.  The digitized samples, along with the   
monitor data necessary to reconstruct the signal, are recorded on     
tape, and/or transmitted in real time to SFOC.  Analysis of           
variations in the amplitude, phase, and frequency of the signal       
provides information on the ring structure, atmospheric density,      
magnetic field, and charged-particle environment of planets which     
occult the spacecraft.  Additionally, this signal information is      
needed for gravity wave detection.                                    
                                                                      
      The Radio Science ODR tapes, also referred to as Original Data  
Stream (ODS) tapes in this document, are shipped to the Network Data  
Control (NDC) subsystem for delivery to the appropriate project Radio 
Science team, or they may be played back via wideband data lines      
(refer to Module RSC-11-4A of this document) to the Ground Communica- 
tions Facility (GCF), where they can be processed in order to produce 
an Intermediate Data Record (IDR).  (Refer to Module IDR-12-1A of this
document.)  Each record, when transmitted to SFOC in real time, also  
contains an SFDU header, which together are encased in Standard DSN   
Blocks (SDBs).  The SFDU header is detailed in Paragraph F below. The 
communication protocol, the header, and the trailer of the SDBs are   
defined and controlled by Modules OPS-6-19, GCF-1O-11, and Document   
890-201.                                                              
                                                                      
            Table 1.  Record Length Tabulation                        
                                                                      
|==========================================================|          
|     Rate*   |  Samples** | Records |   Data   |  Total   |          
|(Samples/sec | per Record |   per   | Words*** |  Words   |          
|     per AD  |  per A/D   |  Second |    per   |   per    |          
|   Converter)| Converter  |         |  Record  |  Record  |          
|----------------------------------------------------------|          
|                     8-Bit Resolution                     |          
|----------------------------------------------------------|          
|  50,000**** |    1000    |    50   |   2000   |   2083   |          
|  31,25O**** |     625    |    50   |   1250   |   1333   |          
|  25,0O0**** |    1000    |    25   |   2000   |   2083   |          
|  20,000     |    1000    |    20   |   2000   |   2083   |          
|  15,625     |     625    |    25   |   1250   |   1333   |          
|  12,500     |     625    |    20   |   1250   |   1333   |          
|  10,000     |    1000    |    10   |   2000   |   2083   |          
|   6,250     |     625    |    10   |   1250   |   1333   |          
|   5,000     |    1000    |     5   |   2000   |   2083   |          
|   4,000     |    1000    |     4   |   2000   |   2083   |          
|   3,125     |     625    |     5   |   1250   |   1333   |          
|   2,500     |     625    |     4   |   1250   |   1333   |          
|   2,000     |    1000    |     2   |   2000   |   2083   |          
|   1,250     |     625    |     2   |   1250   |   1333   |          
|   1,000     |     500    |     2   |   1000   |   1083   |          
|     500     |     250    |     2   |    500   |    583   |          
|     400     |     200    |     2   |    400   |    483   |          
|     250     |     125    |     2   |    250   |    333   |          
|     200     |     100    |     2   |    200   |    283   |          
|----------------------------------------------------------|          
|                     12-Bit Resolution                    |          
|----------------------------------------------------------|          
|  10,000     |     500    |    20   |   1500   |   1583   |          
|   5,000     |     500    |    10   |   1500   |   1583   |          
|   2,000     |     500    |     4   |   1500   |   1583   |          
|   1,000     |     250    |     4   |    750   |    833   |          
|     200     |      50    |     4   |    150   |    233   |          
|----------------------------------------------------------|          
|                           NOTES                          |          
|----------------------------------------------------------|          
|* Maximum effective sampling rate of 4 times the          |          
|  individual converter rate is obtained when all four A-D |          
|  converters sample the same input channel sequentially,  |          
|  but separated by 1/4 cycle.                             |          
|                                                          |          
|** The total number of samples per record is 4 times the  |          
|  number of samples per record per A-D converter.         |          
|                                                          |          
|*** A word contains 16 bits.                              |          
|                                                          |          
|**** Only available when recording at 6250-bpi density.   |          
|                                                          |          
===========================================================|          
                                                                      
                                                                      
                                                                      
                                                                      
D.    DATA RECORDS AND CONTENT                                        
                                                                      
      The DSP-R digitally samples the received spacecraft signal      
with 8-bit or 12-bit resolution and creates records of varying        
lengths, depending on the sample rate and resolution.  Table 1 lists  
the record length for each sample rate.  (Tables 2 and 3 list time    
consumption data and sample time offsets.) Each record is composed    
of (1) a header containing information on system configuration, time- 
tagged receiver local oscillator values, etc., and (2) a block of     
digital data from the four A-D converters.                            
                                                                      
      The DSP-R records data on 9-track tapes with either (1) a tape  
density of 6250 bytes per inch (bpi), using the Group-Coded Recording 
(GCR) format with a 0.3-inch inter-record gap, or (2) a density of    
1600 bpi, using the Phase Encoding (PE) format  with an 0.6-inch      
inter-record gap.  American National Standards Institute (ANSI)       
formats are used.  Only one tape density may be used per recording    
session.                                                              
                                                                      
                                                                      
     Table 2.  Time Consumption for 6250-bpi Tape                     
                                                                      
|======================================================|              
| Samples| Samples per | Records | Records | Time Used |              
|   per  | Record per  |   per   |   per   |     to    |              
| Second |     A-D     | Second  |   Tape  | Fill/Tape |              
| (Rate) |  Converter  |         |         | (minutes) |              
|------------------------------------------------------|              
|                   8-Bit Resolution                   |              
|------------------------------------------------------|              
| 50,000 |    1000     |    50   |  24,000 |      8    |              
| 31,250 |     625     |    50   |  30,000 |     10    |              
| 25,000 |    1000     |    25   |  24,000 |     16    |              
| 20,000 |    1000     |    20   |  24,000 |     20    |              
| 15,625 |     625     |    25   |  30,000 |     20    |              
| 12,500 |     625     |    20   |  30,000 |     25    |              
| 10,000 |    1000     |    10   |  24,000 |     40    |              
|  6,250 |     625     |    10   |  30,000 |     50    |              
|  5,000 |    1000     |     5   |  24,000 |     80    |              
|  4,000 |    1000     |     4   |  24,000 |    100    |              
|  3,125 |     625     |     5   |  30,000 |    100    |              
|  2,500 |     625     |     4   |  30,000 |    125    |              
|  2,000 |    1000     |     2   |  24,000 |    200    |              
|  1,250 |     625     |     2   |  30,000 |    250    |              
|  1,000 |     500     |     2   |  36,000 |    300    |              
|    500 |     250     |     2   |  36,000 |    300    |              
|    400 |     200     |     2   |  55,000 |    458.3  |              
|    250 |     125     |     2   |  55,000 |    458.3  |              
|    200 |     100     |     2   |  55,000 |    458.3  |              
|------------------------------------------------------|              
|                   12-Bit Resolution                  |              
|------------------------------------------------------|              
| 10,000 |     500     |    20   |  30,000 |     25    |              
|  5,000 |     500     |    10   |  30,000 |     50    |              
|  2,000 |     500     |     4   |  30,000 |    125    |              
|  1,000 |     250     |     4   |  41,000 |    170.83 |              
|    200 |      50     |     4   |  58,000 |    241.6  |              
=======================================================|              
                                                                      
      Table 3. Time Consumption for 1600-bpi Tape                     
                                                                      
|======================================================|              
| Samples| Samples per | Records | Records | Time Used |              
|   per  | Record per  |   per   |   per   |     to    |              
| Second |     A-D     | Second  |   Tape  | Fill/Tape |              
| (Rate) |  Converter  |         |         | (minutes) |              
|------------------------------------------------------|              
|                   8-Bit Resolution                   |              
|------------------------------------------------------|              
| 50,000 |     N/A     |         |         |           |              
| 31,250 |     N/A     |         |         |           |              
| 25,000 |     N/A     |         |         |           |              
| 20,000 |    1000     |     20  |  7,000  |     5.83  |              
| 15,625 |     N/A     |         |         |           |              
| 12,500 |     625     |     20  |  7,000  |     5.83  |              
| 10,000 |    1000     |     10  |  7,000  |    11.6   |              
|  6,250 |     625     |     10  |  7,000  |    11.6   |              
|  5,000 |    1000     |      5  |  7,000  |    23.3   |              
|  4,000 |    1000     |      4  |  7,000  |    29.16  |              
|  3,125 |     625     |      5  |  7,000  |    23.3   |              
|  2,500 |     625     |      4  |  7,000  |    29.16  |              
|  2,000 |    1000     |      2  |  7,000  |    58.3   |              
|  1,250 |     625     |      2  |  7,000  |    58.3   |              
|  1,000 |     500     |      2  | 12,000  |   100     |              
|    500 |     250     |      2  | 12,000  |   100     |              
|    400 |     200     |      2  | 20,000  |   166.6   |              
|    250 |     125     |      2  | 20,000  |   166.6   |              
|    200 |     100     |      2  | 20,000  |   166.6   |              
|------------------------------------------------------|              
|                   12-Bit Resolution                  |              
|------------------------------------------------------|              
| 10,000 |     500     |     20  |  9,000  |     7.5   |              
|  5,000 |     500     |     10  |  9,000  |    15     |              
|  2,000 |     500     |      4  |  9,000  |    37.5   |              
|  1,000 |     250     |      4  | 14,000  |    58.3   |              
|    200 |      50     |      4  | 25,000  |   104.16  |              
|======================================================|              
                                                                      
                                                                      
      1.    Beginning of Tape Header                                  
                                                                      
            A special 16-word record is written at the beginning of   
each tape as part of the tape-initialization process.  The first 10   
words of the record are ASCII characters, identifying the program and 
version currently in use; e.g., DMO-52O5-OP-E v 8.04.  The remaining  
six words are nulls.  This information does not appear in the data    
transmitted to SFOC.                                                  
                                                                      
      2.    Time Tag Offset                                           
                                                                      
            The sampled data are later than the reported time tag by  
two intervals of the sample rate of a single A-D converter.  This     
means that in each record the ADC data which corresponds with the     
time tag is the third set of ADC samples in the record, not the first 
set.  (See Words 7 and 8 in paragraph E below.)                       
                                                                      
      3.    Printed Tape Label Format                                 
                                                                      
            The following description refers to the information in    
Figure 1.                                                             
                                                                      
DRIVE = x                                                             
DSP tape drive number (1-6) on which the tape was generated           
                                                                      
YEAR = xxxx                                                           
Year in which tape was generated, such as "1988"                      
                                                                      
SCN = xxx                                                             
Spacecraft number                                                     
                                                                      
PASS xxxx                                                             
Pass number                                                           
                                                                      
SPC xx                                                                
SPC number                                                            
                                                                      
P xx   S xx                                                           
Primary and secondary antenna numbers as received from CMC in setting 
up the link in which the DSP resides.  If only one antenna is used,   
the secondary antenna number will be 0.                               
                                                                      
START TIME xxx:xx:xx:xx.xxx                                           
Time tag of first record on the tape in DOY:HH:MM:SS.sss format.  An  
example is 325:12:02:00.000, which would indicate the first data on   
the tape corresponds to a time of DOY 325 at 12:02:00.                
                                                                      
END TIME xxx:xx:xx:xx.xxx                                             
Time tag of last record on the tape                                   
                                                                      
ERRORS = xxxxx                                                        
Number of write errors detected while recording on this tape          
                                                                      
TAPE#  = xxx                                                          
The number of this tape in this recording session.  The first tape of 
a recording session is numbered 1.                                    
                                                                      
VERSION xxxxxxxxxxxxxxxxxxxx                                          
The ID of the SPA-R software version which generated the tape, such   
as "DM0-5205-0P-E v 8.04".                                            
                                                                      
|-----------------------------------------|                           
| DSPR       DRIVE = x     YEAR = xxxx    |                           
| SCN xxx    PASS xxxx  SPC xx    Pxx Sxx |                           
|                                         |                           
|                                         |                           
| START TIME xxx:xx:xx:xx.xxx             |                           
| END   TIME xxx:xx:xx:xx.xxx             |                           
|                                         |                           
| ERRORS = xxxxx        TAPE# = xxx       |                           
| VERSION xxxxxxxxxxxxxxxxxxxx            |                           
|-----------------------------------------|                           
                                                                      
         Figure 1.  Table Label Format                                
                                                                      
        |===============================================|             
    BIT |01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
WORD 01 | O| S| E| C|COMP FACTOR|      TAPE NUMBER      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     02 |                 RECORD NUMBER                 |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     03 |                LENGTH OF RECORD               |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     04 |       PRIME FEA       |     SECONDARY FEA     |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     05 |   SPACECRAFT NUMBER   |        SPC CODE       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     06 |         YEAR       |        DAY OF YEAR       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     07 |    UNUSED    |    MILLISECONDS PAST 0 h UTC   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     08 |        MILLISECONDS PAST 0 h UTC (cont)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     09 |           PREDICT SET IDENTIFICATION          |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     10 |       PREDICT SET IDENTIFICATION (cont)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     11 |       PREDICT SET IDENTIFICATION (cont)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     12 |       PREDICT SET IDENTIFICATION (cont)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     13 |       PREDICT SET IDENTIFICATION (cont)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     14 |      POCA STATUS      |  POCA FREQ (READBACK) |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     15 |        POCA FREQUENCY (READBACK) (cont)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     16 |        POCA FREQUENCY (READBACK) (cont)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     17 |        POCA FREQUENCY (READBACK) (cont)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     18 |    UNUSED    |  TIME TAG OF POCA FREQ (RDBK)  |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     19 |  TIME TAG OF POCA FREQUENCY (READBACK) (cont) |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     20 |         UNUSED        | POCA FREQ (CALCULATED)|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     21 |       POCA FREQUENCY (CALCULATED) (cont)      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     22 |       POCA FREQUENCY (CALCULATED) (cont)      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     23 |       POCA FREQUENCY (CALCULATED) (cont)      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     24 |    UNUSED    |TIME TAG OF POCA FREQ (UD CYCLE)|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     25 |  TIME TAG OF POCA FREQ (UPDATE CYCLE) (cont)  |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     26 |RFCNF| RFIF|   UNUSED  |  POCA FREQUENCY RATE  |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
    BIT |01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|             
        |===============================================|             
                           (continued)                                
        |===============================================|             
    BIT |01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
WORD 27 |        POCA FREQUENCY RATE        |MULTPLIER S|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     28 |    FREQUENCY COUNTER NO. 1 CUMULATIVE PHASE   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     29 |    FREQUENCY COUNTER NO. 1 CUMULATIVE PHASE   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     30 |    FREQUENCY COUNTER NO. 1 CUMULATIVE PHASE   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     31 |    FREQUENCY COUNTER NO. 2 CUMULATIVE PHASE   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     32 |    FREQUENCY COUNTER NO. 2 CUMULATIVE PHASE   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     33 |    FREQUENCY COUNTER NO. 2 CUMULATIVE PHASE   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     34 |TEST SIGNAL|SAMP CONTRL|CNTR 1 MODE|CNTR 2 MODE|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     35 |    UNUSED    |   TIME TAG OF FMS MEASUREMENT  |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     36 |          TIME TAG OF FMS MEASUREMENT          |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     37 |PREDICT TIME OFFSET (DAYS)|    UNUSED    |T OFF|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     38 |          TIME OFFSET (SECONDS) (cont)         |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     39 |               PREDICT SET OFFSET              |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     40 |            PREDICT SET OFFSET (cont)          |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     41 |            PREDICT SET OFFSET (cont)          |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     42 |                 FILTER OFFSET                 |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     43 |              FILTER OFFSET (cont)             |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     44 |FIL SEL CH1|FIL SEL CH2|FIL SEL CH3|FIL SEL CH4|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     45 |FIL RPT CH1|FIL RPT CH2|FIL RPT CH3|FIL RPT CH4|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     46 |     CH1 ATTENUATOR    |     CH2 ATTENUATOR    |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     47 |     CH3 ATTENUATOR    |     CH4 ATTENUATOR    |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     48 |  ADDITIONAL ATTENUATION (rsvd for future use) |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     49 |  ADDITIONAL ATTENUATION (rsvd for future use) |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     50 |    UNUSED    |  TIME TAG OF RIV ATTEN SETTING |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     51 |      TIME TAG OF RIC RMS VOLTAGE READING      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     52 |           RIV CHANNEL 1 RMS VOLTAGE           |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
    BIT |01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|             
        |===============================================|             
                          (continued)                                 
        |===============================================|             
    BIT |01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
WORD 53 |           RIV CHANNEL 2 RMS VOLTAGE           |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     54 |           RIV CHANNEL 3 RMS VOLTAGE           |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     55 |           RIV CHANNEL 4 RMS VOLTAGE           |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     56 |       RMS VOLTAGE (rsvd for future use)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     57 |       RMS VOLTAGE (rsvd for future use)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     58 |       RMS VOLTAGE (rsvd for future use)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     59 |       RMS VOLTAGE (rsvd for future use)       |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     60 |    UNUSED    |TIME TAG OF RIC RMS VOLT READING|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     61 |   TIME TAG OF RIC RMS VOLTAGE READING (cont)  |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     62 |    A-D #1 RMS MEASUREMENT (S/W CALCULATED)    |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     63 |    A-D #2 RMS MEASUREMENT (S/W CALCULATED)    |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     64 |    A-D #3 RMS MEASUREMENT (S/W CALCULATED)    |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     65 |    A-D #4 RMS MEASUREMENT (S/W CALCULATED)    |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     66 |    A-D #1 MAX VALUE   |    A-D #1 MIN VALUE   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     67 |       A-D #1 NUMBER OF OCCURENCES OF MAX      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     68 |       A-D #1 NUMBER OF OCCURENCES OF MIN      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     69 |    A-D #2 MAX VALUE   |    A-D #2 MIN VALUE   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     70 |       A-D #2 NUMBER OF OCCURENCES OF MAX      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     71 |       A-D #2 NUMBER OF OCCURENCES OF MIN      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     72 |    A-D #3 MAX VALUE   |    A-D #3 MIN VALUE   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     73 |       A-D #3 NUMBER OF OCCURENCES OF MAX      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     74 |       A-D #3 NUMBER OF OCCURENCES OF MIN      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     75 |    A-D #4 MAX VALUE   |    A-D #4 MIN VALUE   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     76 |       A-D #4 NUMBER OF OCCURENCES OF MAX      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     77 |       A-D #4 NUMBER OF OCCURENCES OF MIN      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     78 |    UNUSED    |  TIME TAG OF RMS MEASUREMENT   |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
    BIT |01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|             
        |===============================================|             
                          (continued)                                 
        |===============================================|             
    BIT |01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
WORD 79 |       TIME TAG OF RMS MEASUREMENT (cont)      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     80 |           A-D CONVERTER SAMPLE RATE           |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     81 |     A     |     5     |     5     |     A     |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     82 |      "24" COUNTER     |      "N" COUNTER      |             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
     83 |   CONV MODE REGISTER  | SIGNAL SELECT REGISTER|             
        |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|             
    BIT |01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|             
        |===============================================|             
                                                                      
                Figure 2.  Record Header Information                  
                                                                      
E.    DETAIL RECORD DESCRIPTION                                       
                                                                      
      1.    Header* - (See Figure 2)                                  
                                                                      
WORD 1                                                                
      BIT                                                             
             1          Origin of Narrow Band Occultation Converter   
                        (NBOC) time tag (Words 7 and 8) and           
                        configuration information (Words 81 thru 83)  
                                                                      
                              = O  if time tag (Words 7 and 8) was    
                              generated by DSP-R software counting    
                              from last Frequency and Timing          
                              Subsystem (FTS) 1-second pulse and      
                              configuration information (Words 81     
                              thru 83) was copied forward by software 
                              and not read directly from NBOC buffer. 
                                                                      
                              = 1 if time tag is from FTS and Words 81
                              thru 83 came directly from NBOC buffer. 
                                                                      
                                 NOTES                                
                                                                      
                        If bit 1 is set to "1" the following          
                        additional validity checks may be made:       
                        (a)   Word 81 should be "A55A"                
                        (b)   Word 83, bits 1 thru 8 should indicate  
                              correct configuration from the          
                              Conversion Mode Register.               
                                                                      
                        After bit 1 is set to "1" it will read "O"    
                        for the next L-1 Records, where L is the      
                        number of "Records Per Second" (shown in the  
                        third column) in Table 1 of this module.      
                                                                      
             2          Start of recording session flag:              
                        O if other than first record on recording     
                        session.                                      
                        1 if this is the first record of recording    
                        session.                                      
                                                                      
                                NOTES                                 
                                                                      
                        Each time the program mode is changed from    
                        IDLE to RUN, this bit is set to 1 in the first
                        record.  When the SPA-R software is in its    
                        auto-start/stop operating mode, this bit is   
                        set to 1 in the first record after a BEGIN    
                        RECORDING directive is processed from the     
                        active predict set.                           
                                                                      
            3          Error flag (can only occur during tape copy    
                       process):                                      
                       O  if Master Tape contains no error,           
                       1  if error occurred while reading record on   
                       Master Tape                                    
                                                                      
            4          A-D Conversion:                                
                       1  indicates 8-bit resolution                  
                       0  indicates 12-bit resolution                 
                                                                      
            5 thru 8   0001 = Narrow Band, no compression (for        
                       compatibility with Mk III 0DR)                 
                                                                      
            9 thru 16  Tape Number (binary) in this recording session;
                       first tape is No. 1.                           
                                                                      
                                     NOTE                             
                       A new recording session is indicated each time 
                       the program mode is changed from IDLE to RUN.  
                       Cycling between these two modes will cause each
                       tape to be labeled No. 1.  The recording time  
                       listed on the tape label must be used to       
                       properly verify the tape sequence.  During     
                       auto-start/stop operating mode, the BEGIN      
                       RECORDING and END RECORDING directives do not  
                       alter the Tape Number.                         
                                                                      
WORD 2                                                                
      BIT                                                             
            1 thru 6   Record Number (unsigned binary, reset to 1 at  
                       beginning of each tape)                        
                                                                      
WORD 3                                                                
      BIT                                                             
            1 thru 16  Record Length (binary unsigned integer), number
                       of total words per record:  See Table 1, column
                       titled "Total Words per Record."               
                                                                      
WORD 4                                                                
      BIT                                                             
            1 thru 8   Prime Front End Area (FEA) Number (e.g., 14,   
                       43) (binary)                                   
            9 thru 16  Secondary FEA Number                           
                                                                      
WORD 5                                                                
      BIT                                                             
            1 thru 8   Spacecraft Number (binary) from predicts (see  
                       Module OPS-6-8 of this document)               
            9 thru 16  Signal Processing Center (SPC) Designator      
                       (i.e., 10, 40, 60, or 21); (binary) (see       
                       Module OPS-6-8)                                
                                                                      
WORD 6                                                                
      BIT                                                             
            1 thru 7   Last two digits of year from Monitor and       
                       Control Subsystem (DMC) monitor data (binary)  
            8 thru 16  Day of Year (binary representation if decimal  
                       1 through 366, from FTS system)                
                                                                      
WORD 7                                                                
      BIT                                                             
            1 thru 5   Unused                                         
            6 thru 16  Time of first sample in record, in milliseconds
                        past 0 h Universal Time Coordinated (UTC)     
                        (Binary representation in milliseconds of     
                        decimal 0 thru 86,399,999.)  See Word 1, bit  
                        1, for origin of time tag.  (See paragraph D.2
                        for time tag offset information.)             
                                                                      
WORD 8                                                                
      BIT                                                             
            1 thru 16  Time tag (continued)                           
                                                                      
WORD 9 THRU 13                                                        
      BIT                                                             
            1 thru 16   Predict Set ID; Identification of predicts set
                        used to tune the receiver frequency (ten 8-bit
                        ASCII characters)                             
                                                                      
WORD 14                 POCA Status          Status When Status When  
      BIT                Function              Bit = 1    Bit = O     
            1           Control              Manual      Computer*    
            2           Control              Ready*      Not Ready    
            3           Synthesizer Power    0n*         Off          
            4           Synthesizer In-Lock  In-Lock*    Out-of-Lock  
            5           Limit Enable         On          Off*         
            6           Track                On*          Off         
            7           Acquisition          On           Off*        
            8           Sweep                On*          Off         
            9 thru 16   Frequency value back from the Programmed      
                         Oscillator - Control Assembly (POCA)         
                         frequency registers - binary coded decimal   
                         (BCD) representation in microHertz.          
                                (* Denotes Normal Radio Science Use)  
                                                                      
WORDS I5 THRU 17                                                      
      BIT                                                             
            1 thru 16  Value from POCA Frequency registers (continued)
                                                                      
                                     NOTE                             
                                                                      
                        Examples of POCA frequency values:            
                                                                      
                        Word 14,  bits 9 thru 16 (hex) =   41         
                        Word 15   (hex)                = 5624         
                        Word 16                        = 21           
                        Word 17                        = 3152         
                        Indicates a POCA frequency 41,562,421.673152  
                                                                      
WORD 18                                                               
      BIT                                                             
            1 thru 5    Unused                                        
            6 thru 16   Actual FTS time read from the POCA register in
                        milliseconds past O h UTC.  This is the time  
                        value that should be used for reconstructing  
                        POCA frequency values.                        
                                                                      
WORD 19                                                               
      BIT                                                             
            1 thru 16   Time tag (continued)                          
                                                                      
WORD 20                                                               
      BIT                                                             
            1 thru 8    Unused                                        
            9 thru 16   POCA frequency (calculated) - BCD             
                        representation in microHertz.  Value of the   
                        predicted frequency (plus filter offset and   
                        operator-entered offset) interpolated by the  
                        DSP-R for the time recorded in Words 18 and   
                        19.  The predicted frequency is supplied by   
                        the NSS Radio Science prediction software.    
                                                                      
WORDS 21 THRU 23                                                      
      BIT                                                             
            1 thru 16   POCA frequency (calculated) (continued)       
                                                                      
WORD 24                                                               
      BIT                                                             
            1 thru 5    Unused                                        
            6 thru 16   Time tag of POCA frequency update cycle in    
                        milliseconds past O h UTC.  This time value is
                        for diagnostic purposes only, and should not  
                        be used for data reconstruction.              
                                                                      
WORD 25                                                               
      BIT                                                             
            1 thru 16   Time tag for POCA frequency (update cycle)    
                        (continued)                                   
                                                                      
WORD 26                                                               
      BIT                                                             
             1 thru  2   Antenna RF configuration code which reflects 
                         configuration of IF-video switch selection.  
                         (Operator input selection)                   
                         Modes used are:                              
                         O1 = PRIME mode (70 m)                       
                         10 = CROSS mode (34 m HEF)                   
                         11 = FAROT mode (Faraday rotation)           
             3 thru  4   Antenna RF configuration as reported by the  
                         IF switch assembly.  Same value codes in bits
                         1-2.                                         
             5 thru   8  Unused                                       
             9 thru  16  POCA frequency rate from POCA rate registers 
                         in Hertz per second (5 BCD digits following  
                         the decimal point; i.e., 0.12345)            
                                                                      
WORD 27                                                               
      BIT                                                             
            1 thru 12   POCA Frequency Rate (continued)               
            12 thru 15  Power of 10 multiplier for POCA frequency rate
                        (binary)                                      
            16          Sign for POCA Frequency Rate:                 
                        if 0, rate is negative                        
                        if 1, rate is positive                        
                                                                      
                                     NOTE                             
                                                                      
                  The following are examples of POCA rates:           
                                                                      
                      Word 26                          Decimal Rate   
                   (hex. bits 9-16)  Word 27 (hex)     Conversion     
                         12             3452         -1.2345  Hz/sec  
                         12             3457         123.45   Hz/sec  
                         12             3451         .12345   Hz/sec  
                                                                      
WORDS 28 THRU 30                                                      
      BIT                                                             
            1 thru 16   One-second accumulated phase from frequency   
                        counter No. 1.  Scaled to 2^-20 cycles.  Last 
                        20 bits are fractional part of one cycle.     
                        This is a "running count," not the difference 
                        count from the previous second.               
                                                                      
WORDS 31 THRU 33                                                      
      BIT                                                             
            1 thru 16   One-second accumulated phase from counter No. 
                        2.  Scaled to 2^-20 cycles.  Last 20 bits are 
                        fractional part of one cycle.                 
                                                                      
WORD 34                                                               
      BIT                                                             
             1 thru  4   FMS Test Facility Input Signal Selection:    
                         0001 =  Live input of Counter 1 (POCA "J1")* 
                         0010 =  Live input of Counter 2 ("J2", not   
                                 used)                                
             5 thru  8   FMS Sample Control Register                  
                         Bit 5 = 1 Enable live sample to counter*     
                               = O Disable live sample                
                         Bit 6 = 1 Enable test sample to counter*     
                               = O Disable test sample                
                         Bit 7 = 1 Enable internal 10 MHz to          
                                   resolvers*                         
                               = 0 Enable reference 10 MHz to         
                                   resolvers                          
                         Bit 8 = 1 Enable internal 10 MHz to test     
                                  facilities*                         
                               = 0 Enable reference 10 MHz to test    
                                   facilities                         
             9 thru  12  Frequency Counter Number 1 Mode Register     
                         0000  = Test facility output frequency to    
                                  counter                             
                         0001  =  Live frequency to counter (POCA)*   
             13 thru 16  Frequency Counter Number 2 Mode Register     
                         0000  =  Test facility output frequency to   
                                  counter*                            
                         0001  =  Live frequency to counter (not      
                                  presently connected)                
                              (* Denotes Normal Radio Science Use)    
                                                                      
WORD 35                                                               
      BIT                                                             
            1 thru 5    Unused                                        
            6 thru 16   Time tag Frequency Monitoring Subassembly     
                        (FMS) counter readings (Words 28-33) in       
                        millisecond past 0 h UTC.  This is the FTS    
                        time at which the program stored the FMS      
                        phases described in Words 28 thru 33.         
                        (This time tag is for diagnostic purposes     
                        only.)                                        
                                                                      
WORD 36                                                               
      BIT                                                             
            1 thru 16  Time tag of FMS counter (continued)            
                                                                      
WORD 37 AND 38                                                        
      BIT                                                             
            1 thru 9   Predict Time offset (Days) (binary, positive   
                        value)                                        
            10 thru 14  Unused                                        
            15         Sign of Predict Time Offset:  this sign is     
                        applied to the days and seconds portion       
                        1 = Negative                                  
                        0 = Positive                                  
            16         Predict Time Offset in seconds (17-bit         
                       integer); MSB is Word 37, bit 16; LSB is Word  
                       38, bit 16.  This time offset is input by the  
                       operator in real time as a last-minute         
                       correction to the time domain of the predict   
                       set.  This value is added to the predict set   
                       times, and the results are tracked relative to 
                       real (current FTS).  Therefore, positive time  
                       offsets will cause the original predict times  
                       to occur later, and negative values cause the  
                       times to occur earlier.                        
                                                                      
WORD 38                                                               
      BIT                                                             
            1 thru 16  Predict Time Offset in seconds (continued)     
                                                                      
WORD 39 THRU 41                                                       
      BIT                                                             
            1 thru 16  The S-band Frequency Offset to the predict set;
                       formatted as a 48-bit binary number with LSB   
                       (Word 41, bit 16) equal to 2-20 Hz.  Value may 
                       be positive or negative (2's complement        
                       format).  Maximum value is 2 MHz.  This value  
                       is entered by the operator in real time as a   
                       last-minute correction to the frequency domain 
                       of the predict set.                            
                                                                      
WORD 42 AND 43                                                        
       BIT                                                            
            1 thru 16  Filter Offset; value used by software to tune  
                       carrier signal to center of filter.  This      
                       offset compensates for the unique              
                       characteristics and placement of the filter in 
                       the RF spectrum.  Value is 32-bit signed       
                       binary, scaled in Hertz, applied to the predict
                       set frequencies to obtain the final frequency  
                       result for the POCA.                           
                                                                      
                                     NOTE                             
                                                                      
                       The following station-dependent formulas are   
                       used to determine POCA settings where          
                                                                      
                           Fs = S-Band frequency value                
                           Ff = Filter offset value                   
                                                                      
   POCA =  ((Fs - (3OOMHz) - Ff)*1/3) - 6OOMHz)*2/3  (DSS 7 and 42)   
                                                                      
   POCA =  (Fs - (3OOMHz) - Ff)*1/48                 (DSS 12 and 61)  
                                                                      
   POCA =  ((Fs - Ff)*1/3) - (721 + 9/11)MHz      (all other stations)
                                                                      
                        All values are in MHz, and filter offset is   
                        the value found in Words 42 and 43.  The      
                        offsets found in Words 37 through 41 are      
                        applied to the S-band values before this      
                        formula is used.                              
                                                                      
WORD 44                                                               
      BIT                                                             
             1 thru 4   IF-VF Downconverter Controller (RIC) Operator 
                        filter selection for Channel 1.  Value is     
                        binary representation with a range from 1     
                        to 6.                                         
             5 thru 8   RIC Operator filter selection for Channel 2.  
             9 thru 12  RIC Operator filter selection for Channel 3.  
            13 thru 16  RIC Operator filter selection for Channel 4.  
                                                                      
WORD 45                                                               
      BIT                                                             
            1 thru 4    IF-VF RIC reported filter selection for       
                        Channel 1.  Value is binary representation    
                        with a  range from 1 to 6.                    
            5 thru 8    RIC reported filter selection for Channel 2.  
            9 thru 12   RIC reported filter selection for Channel 3.  
           13 thru 16   RIC reported filter selection for Channel 4.  
                                                                      
WORD 46                                                               
      BIT                                                             
             1 thru 8   RIV Attenuator setting for Channel 1.  Value  
                        is positive, binary representation.  Range of 
                        values from 0 to 119 dB.                      
             9 thru 16  RIV Attenuator setting for Channel 2.         
                                                                      
WORD 47                                                               
      BIT                                                             
             1 thru 8   RIV Attenuator "A" setting for Channel 3.     
             9 thru 16  RIV Attenuator "A" setting for Channel 4.     
                                                                      
WORD 48                                                               
      BIT    1 thru 8   RIV Attenuator "B" setting for future use.    
                        Value is positive, binary representation.     
                        Range of values from O to 119 dB.             
             9 thru 16  RIV Attenuator "B" setting for future use.    
                                                                      
WORD 49                                                               
      BIT                                                             
             1 thru 16  RIV Attenuator "B" setting for future use.    
                                                                      
WORD 50                                                               
      BIT                                                             
             1 thru 5   Unused; set to zeros                          
                                                                      
             6 thru 16  Time tag of RIV Attenuator readings (Words    
                        46-47) in millisecond past O h UTC.           
                                                                      
WORD 51                                                               
      BIT                                                             
             1 thru 16  Time tag of RIV Attenuator readings           
                        (continued)                                   
                                                                      
WORD 52                                                               
      BIT                                                             
             1 thru 16  Receiver Channel 1 RMS voltage as reported by 
                        RIC.  Positive binary representation of       
                        voltage scaled in millivolts.                 
                                                                      
WORD 53                                                               
      BIT                                                             
             1 thru 16  Receiver Channel 2 RMS voltage as reported    
                        by RIC                                        
                                                                      
WORD 54                                                               
      BIT                                                             
             1 thru 16  Receiver Channel 3 RMS voltage as reported    
                        by RIC                                        
                                                                      
WORD 55                                                               
      BIT                                                             
             1 thru 16  Receiver Channel 4 RMS voltage as reported    
                        by RIC.                                       
                                                                      
WORDS 56 THRU 59                                                      
      BIT                                                             
            1 thru 16  Reserved; for future RMS voltage readings.     
                                                                      
WORD 60                                                               
      BIT                                                             
             1 thru 5   Unused                                        
             6 thru 16  Time tag of RIC RMS voltage readings (Words 52
                        thru 55) in milliseconds past O h UTC.  This  
                        is the FTS time that the DSP received the     
                        monitor data from the RIC reporting the       
                        voltmeter readings on the receiver channels.  
                                                                      
WORD 61                                                               
      BIT                                                             
             1 thru 16  Time tag of RIC RMS voltage readings          
                        (continued)                                   
                                                                      
WORD 62                                                               
      BIT                                                             
             1 thru 16  Software-calculated RMS voltage for A-D       
                        channel "1".  Signed two's-complement         
                        representation, scaled in millivolts.         
                                                                      
WORD 63                                                               
      BIT                                                             
             1 thru 16  Software-calculated RMS voltage for A-D       
                        channel "2".                                  
                                                                      
WORD 64                                                               
      BIT                                                             
             1 thru 16  Software-calculated RMS voltage for A-D       
                        channel "3".                                  
                                                                      
WORD 65                                                               
      BIT                                                             
             1 thru 16  Software-calculated RMS voltage for A-D       
                        channel "4".                                  
                                                                      
WORD 66                                                               
      BIT                                                             
             1 thru 8   Maximum A-D value found in A-D "1" data during
                        RMS sample.  Value is same format as A-D data 
                        found starting in Word 84 and following.  (In 
                        12-bit recordings, this is the MSB 8 bits of  
                        the 12-bit sample.)                           
             9 thru 16  Minimum A-D value found in A-D "1" data during
                        EMS sample.                                   
                                                                      
WORD 67                                                               
      BIT                                                             
             1 thru 16  Number of occurrences of maximum value found  
                        in A-D "1".  Two's complement binary format,  
                        range 0-1000.                                 
                                                                      
WORD 68                                                               
      BIT                                                             
             1 thru 16  Number of occurrences of minimum value found  
                        in A-D "1".  Two's complement binary format,  
                        range 0-1000.                                 
                                                                      
WORD 69                                                               
      BIT                                                             
             1 thru 8   Maximum A-D value found in A-D "2" data during
                        RMS sample.                                   
             9 thru 16  Minimum A-D value found in A-D "2" data during
                        RMS sample.                                   
                                                                      
WORD 70                                                               
      BIT                                                             
             1 thru 16  Number of occurrences of maximum value found  
                        in A-D "2".                                   
                                                                      
WORD 71                                                               
      BIT                                                             
             1 thru 16  Number of occurrences of minimum value found  
                        in A-D "2".                                   
                                                                      
WORD 72                                                               
      BIT                                                             
             1 thru 8   Maximum A-D value found in A-D "3" data during
                        RMS sample.                                   
             9 thru 16  Minimum A-D value found in A-D "3" data during
                        EMS sample.                                   
                                                                      
WORD 73                                                               
      BIT                                                             
             1 thru 16  Number of occurrences of maximum value found  
                        in A-D "3".                                   
                                                                      
WORD 74                                                               
      BIT                                                             
             1 thru 16  Number of occurrences of minimum value found  
                        in A-D "3".                                   
                                                                      
WORD 75                                                               
      BIT                                                             
             1 thru 8   Maximum A-D value found in A-D "4" data during
                        EMS sample.                                   
             9 thru 16  Minimum AD value found in A-D "4" data during 
                        EMS sample.                                   
                                                                      
WORD 76                                                               
      BIT                                                             
             1 thru 16  Number of occurrences of maximum value found  
                        in A-D "4".                                   
                                                                      
WORD 77                                                               
      BIT                                                             
             1 thru 16  Number of occurrences of maximum value found  
                        in AD "4".                                    
                                                                      
WORD 78                                                               
      BIT                                                             
             1 thru 5   Unused                                        
             6 thru 16  Time tag of NBOC buffer sample used to        
                        calculate RMS voltages and obtain maximum and 
                        minimum values in Words 66 thru 77 in         
                        milliseconds past O h UTC.  This time tag     
                        corresponds to the time tag found in Words 7  
                        and 8 of an earlier tape record.  The AD data 
                        from this earlier record was saved to run the 
                        calculations found in Words 63 through 66 of  
                        this (current) record.                        
                                                                      
WORD 79                                                               
      BIT                                                             
             1 thru 16  Time tag of RIC RMS Voltage readings          
                        (continued)                                   
                                                                      
WORD 80                                                               
      BIT                                                             
             1 thru 16  Single A-D Converter Sample Rate (16-bit      
                        unsigned binary integer, see Table 2).        
                                                                      
WORD 81      First two bytes of the six bytes of sync data received   
             from the NBOC at the beginning of each second.           
      BIT                                                             
             1 thru 4   Hex 'A' (binary '1010')                       
             5 thru 8   Hex '5' (binary '0101')                       
             9 thru 12  Hex '5' (binary '0101')                       
             13 thru 16 Hex 'A' (binary '1010')                       
                                                                      
WORD 82                                                               
      BIT                                                             
             1 thru 16  Reserved for diagnostic use.                  
                                                                      
WORD 83                                                               
      BIT                                                             
             1 thru 8   Conversion Mode Register (Bytes 4 and 5 of    
                        NBOC Sync Data)                               
                                                                      
                        Where:                                        
                           Bit 1: = 1 if an NBOC converter overflow   
                                    occurred                          
                                  = 0 if nominal                      
                                                                      
                           Bit 2:   Not used                          
                           Bit 3: = 1 NBOC PLL in lock                
                                  = 0 NBOC PLL out of lock            
                                                                      
                           Bit 4: = 1 for 50-, 20-, 10-, 5-, and      
                                      2-kilosamples/second rates      
                                  = 0 for 1000- and 200 samples/second
                                      rates                           
                           Bit 5: = 1 for test mode                   
                                      0 for normal operational mode   
                           Bit 6: = 1 for 8-bit resolution            
                                      0 for 12-bit resolution         
                           Bits 7 thru 8: = Mode:                     
                                         00   4 input signals, each   
                                              sampled by a separate   
                                              converter               
                                         01   1 input signal sampled  
                                              sequentially by 4 A-D   
                                              converters              
                                         10   2 input signals, each   
                                              sampled sequentially by 
                                              2 A-D converters        
                                         11   1 signal sampled        
                                              sequentially by 3 A-D   
                                              converters              
             9 thru 16  Signal Select Register where:                 
                        Bits:                                         
                         9-10: A-D 1  00 = Input Signal Channel 1 (J1)
                        11-12: A-D 2  01 = Input Signal Channel 2 (J2)
                        13-14: A-D 3  10 = Input Signal Channel 3 (J3)
                        15-16: A-D 4  11 = Input Signal Channel 4 (J4)
                                                                      
             (Example:  If bits 9 thru 16 = 10101010, then all 4 A-D  
             converters will sample input Signal Channel 3.)          
                                                                      
2.    Data Portion of Tape Record                                     
                                                                      
      a.     8-bit Quantization Type (See Figure 3).                  
                                                                      
WORD 84                                                               
      BIT                                                             
             1 thru 8   A-D 1 data sample                             
             9 thru 16  A-D 2 data sample                             
                                                                      
WORD 85                                                               
      BIT                                                             
             1 thru 8   A-D 3 data sample                             
             9 thru 16  A-D 4 data sample                             
                                                                      
                                                                      
      |===============================================|               
   BIT|01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
      /                                               /               
      /                                               /               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   84 |         A-D 1         |         A-D 2         |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   85 |         A-D 3         |         A-D 4         |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   86 |         A-D 1         |         A-D 2         |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
      /                                               /               
      /                                               /               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
  N-1 |         A-D 1         |         A-D 2         |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   N  |         A-D 3         |         A-D 4         |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   BIT|01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|               
      |===============================================|               
                                                                      
            *TO FIND THE VALUE OF "N" REFER TO                        
               TABLE 1 FOR EACH SAMPLE RATE.                          
                                                                      
            Figure 3.  8-bit Quantization Format                      
                                                                      
                                                                      
WORDS 86 THRU N                                                       
      BIT                                                             
             1 thru 16  Data Samples of AD 1, A-D 2, A-D 3, and A-D 4 
                        in the same sequence as that in Words 84 and  
                        85                                            
                                                                      
      b.     12-bit Quantization Type (See Figure 4).                 
                                                                      
WORD 84                                                               
      BIT                                                             
             1 thru 4    A-D 1 data sample LSB                        
             5 thru 8    A-D 2 data sample LSB                        
             9 thru 12   A-D 3 data sample LSB                        
             13 thru 16  A-D 4 data sample LSB                        
                                                                      
                                                                      
      |===============================================|               
   BIT|01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
      /                                               /               
      /                                               /               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   84 | A-D 1 LSB | A-D 2 LSB | A-D 3 LSB | A-D 4 LSB |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   85 |       A-D 1 MSB       |       A-D 2 MSB       |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   86 |       A-D 3 MSB      |        A-D 4 MSB       |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
      /                                               /               
      /                                               /               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
  N-2 | A-D 1 LSB | A-D 2 LSB | A-D 3 LSB | A-D 4 LSB |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
  N-1 |       A-D 1 MSB       |       A-D 2 MSB       |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   N  |       A-D 3 MSB       |       A-D 4 MSB       |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   BIT|01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|               
      |===============================================|               
                                                                      
               Figure 4.  12-bit Quantization Format                  
                                                                      
                                                                      
WORD 85                                                               
      BIT                                                             
             1 thru 8    A-D 1 data sample MSB                        
             9 thru 16   A-D 2 data sample MSB                        
                                                                      
WORD 86                                                               
      BIT    1 thru 8    A-D 3 data sample MSB                        
             9 thru 16   A-D 4 data sample MSB                        
                                                                      
WORDS 87 THRU N                                                       
      BIT                                                             
             1 thru 16  Data samples of A-D 1, A-D 2, A-D 3, and      
                        A-D 4 in the same sequence as that in Words   
                        84 thru 86.                                   
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
      |===============================================|               
   BIT|01|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|               
WORD  |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   01 |                                               |               
      /                                               /               
      |           SFDU Type = 'NJPL2IOOC371'          |               
      /                                               /               
   06 |                                               |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   07 |                                               |               
      |                                               |               
   08 |               SFDU Length = xxxx              |               
      |                                               |               
   09 |   (value xxxx depends on ODS record length)   |               
      |                                               |               
   10 |                                               |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   11 |        Label Aggregation CHDO type = 1        |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   12 |       Label Aggregation CHDO length = 28      |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   13 |         Primary Header CHDO type = 2          |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   14 |         Primary Header CHDO length = 4        |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   15 | Major Data Class = 21 |  Minor Data Class = 1 |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   16 |       Mission ID      |    Format Code = 0    |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   17 |        Secondary Header CHDO type = 76        |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   18 |       Secondary Header CHDO length = 16       |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   19 |                     RS-BSN                    |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   20 |                    SPA-R ID                   |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   21 |       Prime FEA       |     Secondary FEA     |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   22 |   Spacecraft Number   |       SPC Number      |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   23 |Originator ID =48 (DSN)|    Year (hundreds)    |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   24 | Year (tens and units) |      Day of Year      |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   25 |                 Milliseconds                  |               
      |                      of                       |               
   26 |                     Day                       |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   27 |          General Data CHDO type = 10          |               
      |--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--|               
   28 |General Data CHDO length = xxxx (ODS dependent)|               
      |===============================================|               
                                                                      
                   Figure 5.  SFDU Header                             
                                                                      
F.    SFDU HEADER                                                     
                                                                      
      Figure 5 details the SFDU header structure, which is prepended  
to each ODS record for transmission to SFOC.                          
                                                                      
WORD 1 THRU 6           Radio Science Real Time Data Delivery SFDU    
                        label; ASCII value   `NJPL2IOOC371'.          
                                                                      
WORD 7 THRU 10          SFDU length; 64-bit binary integer, value     
                        equals the number of bytes in the SFDU        
                        starting from word 11 to the end of the SFDU  
                        (length dependent on ODS record length).      
                                                                      
WORD 11                 Label Aggregation CHDO type; binary integer,  
                        value=1.                                      
                                                                      
WORD. 12                Label Aggregation CHDO length; binary integer,
                        value = 28, the number of bytes in words 13   
                        through 26.                                   
                                                                      
WORD 13                 Primary Header CHDO type; binary integer,     
                        value = 2.                                    
                                                                      
WORD 14                 Primary Header CHDO length; binary integer,   
                        value = 4.                                    
                                                                      
WORD 15                                                               
      BIT                                                             
             1 thru 8   Major Data Class; binary integer, value = 21. 
             9 thru 16  Minor Data Class; binary integer, value = 1.  
                                                                      
WORD 16                                                               
      BIT                                                             
             1 thru 8   Mission ID; binary integer; (see SFOC-5-SYS-  
                        *D-NJPL for values).                          
             9 thru 16  Format code; binary integer; value = 0.       
                                                                      
WORD 17                 Secondary Header CHDO type; binary integer,   
                        value = 76.                                   
                                                                      
WORD 18                 Secondary Header CHDO length; binary integer, 
                        value = 16, the number of bytes in words 19   
                        through 26.                                   
                                                                      
WORD 19                 RS-BSN, Radio Science Block Serial Number;    
                        incrementing integer value used for SFOC      
                        processing.                                   
                                                                      
WORD 20                 SPA-R ID, identifier of Radio Science Spectrum
                        Processing Assembly generating this data      
                        stream; hexadecimal binary integer OE3O =     
                        SPA-R 1, 0E31 = SPA-R 2.                      
                                                                      
WORD 21                                                               
      BIT                                                             
             1 thru 8   Prime Front End Area (FEA) Number             
                        (e.g., 14, 43)                                
             9 thru 16  Secondary FEA Number                          
                                                                      
WORD 22                                                               
      BIT                                                             
             1 thru 8   Spacecraft Number (binary) from predicts (see 
                        module OPS-6-8 of this document)              
             9 thru 16  Signal Processing Center (SPC) Designator     
                        (i.e., 10, 40, 60, or 21); (binary) (see      
                        module OPS-6-8)                               
                                                                      
WORD 23                                                               
      BIT                                                             
             1 thru 8   Originator ID; binary integer; value = 48,    
                        representing the DSN as the originator of this
                        data.                                         
             9 thru 16  First two digits of year from Monitor and     
                        Control Subsystem (DMC) monitor data (binary).
                                                                      
WORD 24                                                               
      BIT                                                             
             1 thru 7   Last two digits of year from Monitor and      
                        Control Subsystem (DMC) monitor data (binary) 
             8 thru 16  Day of Year (binary representation if decimal 
                        1 through 366, from FTS system)               
                                                                      
WORD 25                                                               
      BIT                                                             
             1 thru 5   Unused; set to zeros.                         
             6 thru 16  Time of first sample in record, in            
                        milliseconds past 0 h Universal Time          
                        Coordinated (UTC) (Binary representation in   
                        milliseconds of decimal 0 thru 86,399,999.)   
                        See Word 1, bit 1, for origin of time tag.    
                        (See Paragraph D.2 for time tag offset        
                        information.)                                 
                                                                      
WORD 26                                                               
      BIT                                                             
             1 thru 16  Time tag (continued)                          
                                                                      
WORD 27                 General Data CHDO type; binary integer,       
                        value =  10.                                  
WORD 28                 General Data CHDO length; binary integer,     
                        value = xxxx, (length dependent on, and equal 
                        to, the ODS record length in bytes).          
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                                                      
                                   GLOSSARY                           
                                                                      
A-D       Analog To Digital                                           
ANSI      American National Standards Institute                       
ASCII     American Standard Code for Information Interchange          
BCD       Binary Coded Decimal                                        
bpi       Bits Per Inch                                               
CHDO      Compressed Header Data Object                               
DMC       DSCC Monitor and Control Subsystem                          
DSN       Deep Space Network                                          
DSCC      Deep Space Communications Complex                           
DSP-R     Radio Science DSCC Spectrum Processor                       
FAROT     Faraday Rotation                                            
FEA       Front End Area                                              
FMS       Frequency Monitor Subassembly                               
FTS       Frequency and Timing Subsystem                              
GCF       Ground Communication Facility                               
GCR       Group Coded Recording                                       
IDR       Intermediate Data Record                                    
LSB       Least Significant Bit                                       
MSB       Most Significant Bit                                        
NBOC      Narrow Band Occultation Converter                           
NDC       Network Data Control                                        
ODR       Original Data Record                                        
ODS       Original Data Stream                                        
PE        Phase Encoding                                              
POCA      Programmed Oscillator Control Assembly                      
RIC       Receiver-Exciter Subsystem IF-Video Downconverter Controller
RIV       Receiver-Exciter Subsystem IF-Video Downconverter           
RMS       Root Mean Square                                            
SFDU      Standard Formatted Data Unit                                
SFOC      Space Flight Operations Center                              
SPAR      Radio Science Spectrum Processor Assembly                   
SPC       Signal Processing Center                                    
UTC       Universal Time Coordinated