PDS_VERSION_ID = PDS3
RECORD_TYPE = FIXED_LENGTH
RECORD_BYTES = 80
OBJECT = DATA_SET
DATA_SET_ID = "GO-X-RSS-1-ODR-V1.0"
OBJECT = DATA_SET_INFORMATION
DATA_SET_NAME = "GALILEO RAW ODR GRAVITATIONAL
WAVE DATA V1.0"
DATA_SET_COLLECTION_MEMBER_FLG = "N"
DATA_OBJECT_TYPE = TABLE
START_TIME = 1994-04-28T14:16:19Z
STOP_TIME = "UNK"
DATA_SET_RELEASE_DATE = 1997-06-27
PRODUCER_FULL_NAME = "RADIO SCIENCE SUPPORT TEAM"
DETAILED_CATALOG_FLAG = "N"
DATA_SET_DESC = "
Data Set Overview
=================
This data set contains raw open-loop Radio Science data from the
Galileo (GLL) Gravitational Wave Experiments (GWE). There are
two Gravitational Wave experiments conducted over the following time
periods:
GWE 1: April 28, 1994, to June 11,1994
GWE 2: May 20, 1995, to June 2, 1995
The data set includes Original Data Records (ODRs) and the supporting
information necessary to reduce the data. Other data sets contain
radio tracking data for the same periods.
The experiment is described in detail in DESCRIPT.TXT in the DOCUMENT
directory. Another explanation of the experiment, as well as the
ground equipment, spacecraft, and operations procedures, may be found
in the Radio Science Handbook. This handbook is also in the DOCUMENT
directory.
Parameters
==========
Open loop data records (ODRs) contain 8-bit samples of receiver
output. Each block of 400 data samples is accompanied by a 166
byte header. The ODR is described by a Software Interface
Specification (SIS), included as RSC11_11.TXT in the
DOCUMENT directory.
Data
====
Original Data Records (ODRs) were the primary data type for this raw
data archive. ODRs were generated at stations of the NASA Deep Space
Network (DSN) and were distributed on 6250 bpi tape. Those tapes have
been copied to disk files, defined as PDS TABLE Objects, and archived
on these CD-WO volumes. ODRs are stored on CD-WO volumes in
chronological order; ancillary data files (to support analysis)
accompany ODRs in the CALIB and DOCUMENT directories.
A nominal ODR contains 55000 records, each record having 166 bytes
of header data and 400 bytes of 8-bit sample data. Each of four
receiver channels (X-RCP, S-RCP, X-LCP, and S-LCP) was sampled at
200 samples per second; these channels appear in the output record
as channels 1 through 4, respectively [see RSC11_11.TXT in the
DOCUMENT directory of the archival volume]. Only the S-RCP
channel contains a true signal for Galileo.
Each ODR data file is accompanied by a full PDS detached label
with name ydddhhmm.LBL which completely describes the contents
of the ODR file. The format and content of the ODR are also described
in or RSC11_11.TXT in the DOCUMENT directory of each
archival volume.
Ancillary Data
==============
The ancillary files are stored in the CALIB and DOCUMENT directories.
Each ancillary file is accompanied by a detached PDS minimal label
having the same file name except for the suffix 'LBL'.
Low-Gain Antenna (LGA) Radiation Pattern
-----------------------------------------
The radiation pattern of the low-gain antenna (LGA) is described
in files LGA1_DL.TAB and LGA1_UL.TAB in the CALIB directory.
These files provide the radiation patterns for downlink and
uplink, respectively.
Post-Operations Report
----------------------
The Post-Operations Report describes the tracking coverage,
spacecraft activity, and DSN equipment problems in a graphical
format. This report is in the DOCUMENT directory.
Coordinate System
=================
Most data types are not dependent on definition of a coordinate
system; for those that are, the user should consult the appropriate
SIS for information.
Software
========
Software for parsing, reducing, and analyzing data such as these has
been developed at the Jet Propulsion Laboratory and elsewhere.
Because parsing must be done at the bit level, its implementation may
be very sensitive to platform and operating system. No parsing
has been written and tested on a variety of platforms, so none has
been included with the archival data set. Users are referred to PDS
labels, to files in the DOCUMENT directory, and to hard copy Software
Interface Specifications for detailed information on file formats.
Media/Format
============
The archival data set is written on CD-WO media using the Young Minds
CD Studio authoring system. The CD-WO volume conforms to ISO 9660
standards."
CONFIDENCE_LEVEL_NOTE = "
Overview
========
There are no known limitations to use of these data, subject to
signal-to-noise considerations which would be typical for systems
of this type.
Review
======
Prior to creation of the final version of the archival data set,
key elements of the archive were distributed for preliminary review.
These included electronic versions of example PDS labels, CATALOG
files, and Software Interface Specifications. These materials were
distributed to PDS personnel and the PDS Radio Science advisor.
Data Coverage and Quality
=========================
The data cover the periods of Gravitational Wave between April,
1994, and June, 1995. There are no known quality issues which
would limit use of these data other than the normal signal-to-noise
constraints.
Limitations
===========
None."
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