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: Prepared by: A. PURPOSE 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. 820-13; Rev. A RSC-11-11 2. Applicable Documents The interface requirements established in this module were derived from guidelines and criteria contained in the following documents: 820-13 Network-Level data Flow Standard (RSC-6-19) 820-13 SFOC/GCF Interface Agreement (GCF-1O-11) 820-13 Wideband GCF Radio Science Playback Blocks (RSC-11-4A) and DSN Radio Science System Interface 820-13 DSN Interfaces - IDR Formats (Mark IVA) (IDR-12-1A) 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 Communications 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. 2 820-13; Rev. A RSC-11-11 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. 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.) 3 820-13; Rev. A RSC-11-11 Table 1. Record Length Tabulation |==============================================================================| | Rate* | | | | | | (Samples/second | Samples** | | | | | per AD | per Record per | Records | Data Words*** | Total Words | | Converter) | A-D Converter | per Second | per Record | per 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. | | | ===============================================================================| 4 820-13; Rev. A RSC-11-11 Table 2. Time Consumption for 6250-bpi Tape |==============================================================================| | | Samples/ | | | Time Used to | | Samples/Second | Record per A-D | Record/ | | Fill/Tape | | (Rate) | Converter | Second | Record/Tape | (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 | ===============================================================================| 5 820-13; Rev. A RSC-11-11 Table 3. Time Consumption for 1600-bpi Tape |==============================================================================| | | Samples/ | | | Time Used to | | Samples/Second | Record per AD | Record/ | | Fill/Tape | | (Rate) | Converter | Second | Record/Tape | (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 | |==============================================================================| 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 6 820-13; Rev. A RSC-11-11 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 7 820-13; Rev. A RSC-11-11 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. BIT 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. 8 820-13; Rev. A RSC-11-11 ________________________________________ ___________________________________________ BIT |1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16| BIT |1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16| WORD 1 |O S E C COMPRESSION TAPE NUMBER | WORD 43 |FILTER OFFSET | FACTOR 2 |RECORD NUMBER 44 |RIC CH1 F OPR RIC CH1 2 F OPR RIC CH1 3 F OPR RIC CH1 4 F OPR 3 |LENGTH OF RECORD 45 |RIC CH1 F LTR RIC CH1 2 F LTR RIC CH1 3 F LTR RIC CH1 4 F LTR 4 |PRIME FEA SECONDARY FEA 46 |CH 1 ATTENUATOR CH 2 ATTENUATOR 5 |SPACECRAFT NUMBER SPC CODE 47 |CH 3 ATTENUATOR CH 4 ATTENUATOR 6 |YEAR DAY OF YEAR 48 |FUTURE ATTENUATOR FUTURE ATTENUATOR 7 |UNUSED MILLISECONDS PAST O UTC 49 |FUTURE AT 8 |MILLISECONDS OF DAY 50 |UNUSED TIME TAG OF RIC ATTENUATOR READING 9 |PREDICT SET IDENTIFICATION 51 |TIME TAG OF RIC RMS VOLTAGE READING 10 | "" 52 |RIV CHANNEL 1 RMS VOLTAGE 11 | "" 53 |RIV CHANNEL 2 RMS VOLTAGE 12 | "" 54 |RIV CHANNEL 3 RMS VOLTAGE 13 |PREDICT SET IDENTIFICATION 55 |RIV CHANNEL 4 RMS VOLTAGE 14 |POCA STATUS POCA FREQ (RDBK) 56 |FUTURE RMS VOLTAGE 15 |POCA FREQUENCY (READBACK) 57 |FUTURE RMS VOLTAGE 16 |POCA FREQUENCY (READBACK) 58 |FUTURE RMS VOLTAGE 17 |POCA FREQUENCY (READBACK) 59 |FUTURE RMS VOLTAGE 18 |UNUSED TIME TAG OF POCA FREQ (RDBK) 60 |UNUSED TIME TAG OF RIG RM$ VOLTAGE READING 19 |TIME TAG OF POCA FREQUENCY (READBACK) 61 |TIME TAG OF RIC RMS VOLTAGE READING 20 |UNUSED POCA FREQ (CALCULATED) 62 |A-D "1" RMS MEASUREMENT(SOFTWARE CALCULATED) 21 |POCA FREQUENCY (CALCULATED) 63 |A-D "2" RMS MEASUREMENT 22 |POCA FREQUENCY (CALCULATED) 64 |A-D "3" RMS MEASUREMENT 23 |POCA FREQUENCY (CALCULATED) 65 |A-D "4" RMS MEASUREMENT 24 |UNUSED TIME TAG OF POCA FREQ (UPDATE CYCLE) 66 |A-D "1" MAX VALUE A-D "1" MAX VALUE 25 |TIME TAG OF POCA FREQUENCY (UPDATE CYCLE) 67 |A-D "1" NUMBER OF OCCURENCES OF MAX. 26 |RFCNF RFIF UNUSED POCA FREQUENCY RATE 68 |A-D "1" NUMBER OF OCCURENCES OF MIN. 27 |POCA FREQUENCY RATE MULTIPLIER: S 69 |A-D "2" MAX VALUE A-D "2" MIN. VALUE 28 |FREQUENCY COUNTER NO. 1 CUMULATIVE PHASE 70 |A-D "2" NUMBER OF OCCURENCES OF MAX. 29 |FREQUENCY COUNTER NO. 1 CUMULATIVE PHASE 71 |A-D "2" NUMBER OF OCCURENCES OF MIN. 30 |FREQUENCY COUNTER NO. 1 CUMULATIVE PHASE 72 |A-D "3" MAX VALUE A-D "3" MIN. VALUE 31 |FREQUENCY COUNTER NO. 2 CUMULATIVE PHASE 73 |A-D "3" NUMBER OF OCCURENCES OF MAX. 32 |FREQUENCY COUNTER NO. 2 CUMULATIVE PHASE 74 |A-D "3" NUMBER OF OCCURENCES OF MIN. 33 |FREQUENCY COUNTER NO. 2 CUMULATIVE PHASE 75 |A-D "4. MAX VALUE A-D "4" MIN. VALUE |TEST SIGNAL SAMPLE CNTR #1 MODE CNTR #2 MODE 76 |A-D "4" NUMBER OF OCCURENCES OF MAX. | CONTROL 35 |UNUSED TIME TAG OF FMS MEASUREMENT 77 |A-D "4" NUMBER OF OCCURENCES OF MIN. 36 |TIME TAG OF FMS MEASUREMENT 78 | TIME TAG OF RMS MEASUREMENT 37 |PREDICT TIME OFFSET (DAYS) UNUSED SGN MSB 79 |TIME TAG OF RMS MEASUREMENT 38 |TIME OFFSET (SECONDS) LSB 80 |A-D CONVERTER SAMPLE RATE 39 | PREDICT FREQUENCY OFFSET 81 | A 5 5 A 40 |PREDICT FREQUENCY OFFSET 82 |24" COUNTER "N" REGISTER 41 |PREDICT FREQUENCY OFFSET 83 |CONVERSION MODE REGISTER SIGNAL SELECT REGISTER 42 |FILTER OFFSET |1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 |1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Figure 2. Record Header Information 9 820-13; Rev. A RSC-11-11 WORD 1 (Continued) BIT 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) 10 820-13; Rev. A RSC-11-11 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* WORD 14 POCA Status Status When Status When BIT Function Bit = 1 Bit = 0 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. WORDS IS THRU 17 BIT 1 thru 16 Value from POCA Frequency registers (continued) 11 820-13; Rev. A RSC-11-11 NOTE Examples of POCA frequency values: Word 14, bits 9 thru 16 (hex) = 41 Word 15 (hex) = 5624 Word 16 = 2167 Word 17 = 3152 Indicates a POCA frequency of 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) _________________________________ *Denotes Normal Radio Science Use 12 820-13; Rev. A RSC-11-11 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 8 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. 13 820-13; Rev. A RSC-11-11 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* =ňO 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) 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 _________________________________ *Denotes Normal Radio Science Use 14 820-13; Rev. A RSC-11-11 WORD 37 AND 38 (Continued) BIT 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 5-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 POCA = (((S-Band Value) - (3OOMhz) - (Filter Offset value))*1/3) - 6OOMhz)*2/3 DSS 7 and 42 15 820-13; Rev. A RSC-11-11 POCA = ((S-Band Value) - (3OOMhz) - (Filter Offset value))*1/48 DSS 12 and 61 POCA = (((S-Band Value) - (Filter Offset value))*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. 16 820-13; Rev. A RSC-11-11 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. 17 820-13; Rev. A RSC-11-11 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. 18 820-13; Rev. A RSC-11-11 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". 19 820-13; Rev. A RSC-11-11 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 20 820-13; Rev. A RSC-11-11 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 and 10: A-D 1 00 = Input Signal Channel 1 (J1) 11 and 12: A-D 2 01 = Input Signal Where Channel 2 (J2) WORD 83 (Continued) BIT 13 and 14: A-D 3 10 = Input Signal Channel 3 (J3) 15 and 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 21 820-13; Rev. A RSC-11-11 -------------------------------------------------------- BIT| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16| WORD ~ ~ 84| A-D 1 A-D 2 | 85| A-D 3 A-D 4 | 86| | ~ ~ | | N*-1 | A-D 1 A-D 2 | N | A-D 3 A-D 4 | | | | 1 2 3 4 5 6 7 8 9 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 -------------------------------------------------------- BIT| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16| WORD ~ ~ 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 | | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16| -------------------------------------------------------- Figure 4. 12-bit Quantization Format 22 820-13; Rev. A RSC-11-11 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 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. 23 820-13; Rev. A RSC-11-11 F. SFDU HEADER Figure 5 details the SFDU header structure, which is pre-pended to each ODS record for transmission to SFOC. BIT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 WORD 1 2 SFDU Type = `NJPL2IOOC371' 3 4 5 6 ----------------------------------------------------------- 7 | | | | 8 | | | SFDU Length = xxxx | 9 | | | (value dependent on | 10 | ODS record length) | | | 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 | ---------------------------------------------------------- Figure 5. SFDU Header (Sheet 1 of 2) 24 820-13; Rev. A RSC-11-11 ---------------------------------------------------------- 17| Secondary Header CHDO type 76 | 18| Secondary Header CHDO type 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 Day | 26| | 27| General Data CHDO type 10 | 28| General Data CHDO length = xxxx (0DS dependent) | ---------------------------------------------------------- Figure 5. SFDU Header (Sheet 2 of 2) 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. 25 820-13; Rev. A RSC-11-11 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). 26 820-13; Rev. A RSC-11-11 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). 27 820-13; Rev. A RSC-11-11 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 28