PDS_VERSION_ID     = PDS3
RECORD_TYPE        = STREAM
OBJECT             = TEXT
  PUBLICATION_DATE = 2025-07-01
  NOTE             = "aareadme.txt describes this volume"
END_OBJECT         = TEXT
END


The Venus Climate Orbiter RS Doppler Profiles Data Archive
==============================================================================


Introduction
============

   This document provides an overview of Doppler Profiles data archive
   obtained by radio science experiments using Ultra-Stable Oscillator (USO)
   onboard the Venus Climate Orbiter (VCO, also known as PLANET-C and
   AKATSUKI), including a description of the directory structure. Additional
   documents included in this data set provide more details, especially the
   'dataset.cat' data set description and the various directory-specific
   '/*/*info.txt' files.

   This data set contains Doppler Profiles data taken by radio science
   experiments using USO onboard the Venus Climate Orbiter spacecraft. See the
   file 'rsinst.cat' in the '/catalog' directory for a description of the
   instrument used for Radio Science experiments (RS), and the file
   'mission.cat' for a description of the Venus Climate Orbiter mission and
   the file 'vcohost.cat' for a description of the Venus Climate Orbiter
   spacecraft.


File Formats
============

   All '*.txt' documents and other meta information files such as
   descriptions, PDS object definitions and detached PDS labels are stream
   format files, with a carriage return (ASCII 13) and a line feed character
   (ASCII 10) at the end of the record. This allows the files to be read by
   MS-DOS/Windows, Unix, and macOS operating systems.

   The data product files and the 'index.tab' file are ASCII text tables made
   of fixed-byte records. The detailed format specification for these files
   can be found in the label files. The file 'indxinfo.txt' provides
   additional information for the 'index.tab' file.

   All data files in the archive have detached PDS labels. The PDS label
   provides descriptive information about the associated file. The PDS label
   is an object-oriented structure consisting of sets of 'keyword=value'
   declarations. The object to which the label refers (e.g. IMAGE, TABLE,
   etc.) is denoted by a statement of the form:

      ^object = location

   in which the carat character (^, also called a pointer in this context)
   indicates where to find the object. For all detached labels, the location
   contains the name of the file containing the object. For most labels the
   location consists only of the name of the file being referenced, but for
   the label files corresponding to data product files, it also includes a
   byte offset indicating how far into the file to read before the data itself
   begins. (Each data product file has a variable-length header.) along with
   the starting record or byte number, if there is more than one object in the
   file.

   For example:

      ^DOPPLER_TABLE = "rs_20160303_223100_udsc64_l2_v10.tab"

   This indicates that the table data is located in the file
   'rs_20160303_223100_udsc64_l2_v10.tab'.


Volume Contents
===============

   Files on this volume are organized into a set of subdirectories below the
   top-level directory. The following table shows the structure and content of
   these directories. In this table, directory names are enclosed in square
   brackets ([]). See the '*info.txt' files in each directory for specific
   information on the files in the directory, including naming schemes.


   [top-level-directory]
   |
   |-- aareadme.txt         This file.
   |
   |-- errata.txt           Comments and errata on this volume.
   |
   |-- voldesc.cat          Description of the contents of this volume.
   |
   |--[catalog]             Directory containing PDS catalog objects.
   |  |
   |  |-- catinfo.txt       Description of files in the 'catalog' directory.
   |  |
   |  |-- dataset.cat       Description of the data set.
   |  |
   |  |-- rsinst.cat        Description of the instrument.
   |  |
   |  |-- rsref.cat         List of instrument-specific publications
   |  |                     mentioned in 'rsinst.cat' file.
   |  |
   |  |-- mission.cat       Description of the mission.
   |  |
   |  |-- person.cat        References for personnel who created this
   |  |                     volume.
   |  |
   |  |-- ref.cat           List of mission-wide publications mentioned in
   |  |                     '*.cat' files.
   |  |
   |  |-- target_dust.cat   Description of the target, cosmic dust.
   |  |
   |  |-- target_earth.cat  Description of the target, the Earth.
   |  |
   |  |-- target_sun.cat    Description of the target, the Sun.
   |  |
   |  |-- target_venus.cat  Description of the target, Venus.
   |  |
   |  +-- vcohost.cat       Description of the spacecraft.
   |
   |--[data]                Directory containing data files and PDS labels
   |  |                     describing the contents of those files.
   |  |
   |  +--[l2]               Subdirectory for level 2 (l2) data.
   |     |
   |     |-- *.tab          A data product file in ASCII text table format.
   |     |
   |     +-- *.lbl          The corresponding detached PDS label file.
   |
   |--[document]            Directory containing volume related documents.
   |  |
   |  |-- docinfo.txt       Description of files in the 'document' directory.
   |  |
   |  |-- onlabels.txt      Description of PDS labels for this data set.
   |  |
   |  +-- rscalc.txt        Description of principle and calculation in Radio
   |                        Science experiment.
   |
   +--[index]               Directory containing index files.
      |
      |-- indxinfo.txt      Description of files in the 'index' directory.
      |
      |-- checksum.tab      Table of MD5 checksums for files in this data set.
      |
      |-- checksum.lbl      PDS label for 'checksum.tab' file.
      |
      |-- index.tab         Index table of the data on this volume.
      |
      +-- index.lbl         PDS label for 'index.tab' file.


Whom to Contact for Information
===============================

   Institute of Space and Astronautical Science (ISAS),
   Japan Aerospace Exploration Agency (JAXA)
   3-1-1 Yoshinodai, Chuo-ku, Sagamihara-shi,
   Kanagawa 252-5210, Japan
   WWW Site: https://darts.isas.jaxa.jp/en/about
   Electronic mail address: darts-admin@ml.isas.jaxa.jp


Cognizant Persons
=================

   This archive was designed and produced by Shin-ya Murakami,
   Hiroki Ando, Takeshi Imamura, and Yukio Yamamoto.
