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Voyager Radio Science Archive
Titan Open-Loop Raw Data
(VG1-SSA-RSS-1-ROCC-V1.0)
Introduction
============
This volume contains archival raw, partially processed, and
ancillary/supporting data acquired during the Voyager 1 (VG1) radio
occultation by Titan.
Observations were carried out using the VG1 spacecraft and Earth-based
receiving stations of the NASA Deep Space Network (DSN). The observations
were designed so that physical structure of Titan's atmosphere (including
surface temperature and pressure) could be determined. The data also allowed
estimation of Titan's radius and a marginal detection of an ionosphere.
The spacecraft S- and X-band carrier signals served as coherent signal
sources, probing the atmosphere at various depths. Output from the DSN
receivers was sampled and recorded for later analysis. Two recording systems
were used, running in parallel with staggered start/stop times. The original
data tapes were converted to computer-compatible tapes (CCTs) later at the
NASA Jet Propulsion Laboratory. The data from these CCTs (with names of the
form VJnnnn) represent the primary archival product here.
Data that may appear on this volume as version 1.1 was previously archived
with the NSSDC and PDS as version 1.0. Changes include reformatting of the
time column, standardization of flag values, and upgrading of labels and
catalog templates to PDS version 3.2. Data found on this volume supersede
all previous versions.
Every effort has been made to insure that the data are of the best quality
available. However, the PDS and the Planetary Plasma Interactions (PPI) Node
in particular, assume no liability for this volume or its contents. Users are
encouraged to verify the 'correctness' of the data prior to submitting any
publications or other work based on these data.
Brief Volume Description
----------------------
This data set is organized into 8 principal sub-directories:
CATALOG PDS catalog templates describing the Voyager mission,
spacecraft, instruments, data sets, key personnel and references
DATA raw data collected during the Titan radio occultation of VG1
DOCUMENT documents describing instruments, data sets, or software
contained on this volume
GEOMETRY ephemerides and files describing the pointing of the Voyager 1
High-Gain Antenna (HGA) during the radio occultations at Titan
INDEX index of all user files contained on this volume
BROWSE Contains browse plots depicting the data
EXTRAS additional information
CALIB contains files of receiver tuning data
More information on directory structure is contained in the section entitled
'Volume Contents and Structure.' Novice users, however, may ignore all files
and directories except for the 'Important Files and Directories' listed
below.
Important Files and Directories
-------------------------------
All data files are stored, either in ASCII (.TAB) or binary (.DAT) format
files, in the /DATA branch of the directory tree. The content of each data
file is described by a detached PDS label file (.LBL). A single format file
(.FMT), which is pointed to by the label file (^STRUCTURE), describes the
data file's internal structure or record format. The files DATASET.TXT and
INFO.TXT provide additional information about data set and directory
contents.
An *INFO.TXT file (e.g. CATINFO.TXT, etc.), containing a description of the
directory tree and sub-directory contents, is located in every directory
immediately below the root. The INFO.TXT files provided on selected data
sub-directories contain detailed descriptions of the directories on which
they are located.
Documents
=========
The documents provided on this volume (in the /DOCUMENT sub-directory)
include copyrighted materials previously published in Space Science Reviews,
Vol. 21, No. 2, pp. 77-101, November 1977, and Space Science Reviews,
Vol. 21, No. 3, pp. 235-376, December 1977. These materials appear on this
volume with the permission of Kluwer Academic Publications (Kluwer). Kluwer
retains Copyright over these articles. Please see the Copyright statement
appearing at the beginning of each of the Space Science Reviews articles.
File Formats
============
All of the label, table, and text files are ASCII format.
All files in this volume are described by detached or combined detached PDS
labels. PDS labels have a file extension of '.LBL' and generally have the
same name as the file which it describes. All PDS label files in this volume
are completely PDS Standards Version 3.8 compliant.
Data files are either stored in ASCII (.TAB), or binary (.DAT) format. ASCII
file records are generally fixed length with space delimited
fields or columns. Refer to the label (.LBL) and format (.FMT) files for
information about the format and structure of a specific data file.
This volume contains copies of documents associated with the data provided.
These documents are reproduced in both plain ASCII text (.ASC) and PDF(.PDF)
versions.
Errata
======
For a description of any errors known at the time of the production of this
volume, please refer to the file ERRATA.TXT found in the root directory.
Volume Contents and Structure
=============================
The tree diagram below provides a listing and brief description of the
contents and key files of the root directory and instrument sub-directories
of the /DATA directory. Note that some files may be omitted from this
description. Each file in this volume (with the exception of *.CAT files) is
associated with a PDS label file (.LBL) which describes its content and
characteristics. For more information, please refer to the *INFO.TXT files
located on each of the sub-directories of the root directory, or the
INFO.TXT files located on the individual data sub-directories.
Square brackets ([]) denote directories.
VG1_9056 (root directory)
|
|- AAREADME.TXT describes volume contents and organization (this file)
|
|- ERRATA.TXT file describing errors and anomalies found in this
| volume
|
|- VOLDESC.CAT high level description of volume contents
|
|-[CALIB} contains files of receiver tuning data
|
|-[CATALOG] Contains metadata associated with this volume including
| mission, instrument host (spacecraft), instrument,
| data set, personnel and reference descriptions and
| information (*.CAT files)
|
|-[DOCUMENT] Contains mission, software, and instrument
| sub-directories which contain documents relating to
| the data set.
|
|-[BROWSE] Contains browse plots depicting the data.
|
|-[INDEX] Contains a listing including file name and location,
| for all user files contained in this volume.
|
|-[EXTRAS] Bonus content not necessarily conforming to
| PDS archive standards.
|-[DATA] raw data collected during the Titan radio
occultation of VG1
Contacts
========
The person most directly responsible for the construction and release of
this volume is Mr. Steven Joy. He was the PPI Node Data Administrator at the
time this volume was created and understands as much about the structure
and data organization as anyone. The construction of the PDS labels and
templates was done by Mr. Joe Mafi. Other PPI personnel who may be aware of
about issues related to this volume include Dr. Raymond Walker, the PDS/PPI
node manager.
For questions or problems regarding this Clime, please contact the PDS/PPI
PDS operator:
Email pds_operator@igpp.ucla.edu
Telephone (310) 206-6073
U.S. Mail PDS Operator
c/o Dr. Raymond Walker
3845 Slichter Hall
UCLA - IGPP
Los Angeles, CA 90095-156704
For questions regarding PDS Standards or other volumes available from PDS,
please contact PDS Operator at the PDS Central Node (at JPL):
Email pds_operator@jpl.nasa.gov
Telephone (818) 354-4321
U.S. Mail Planetary Data System, PDS Operator
Jet Propulsion Laboratory
4800 Oak Grove Drive
Mail Stop 202-101
Pasadena, CA 91109
|