PDS_VERSION_ID = PDS3 RECORD_TYPE = STREAM OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2015-10-09 NOTE = "N/A" END_OBJECT = TEXT END MESSENGER Radio Science MESSENGER Radio Science Raw Data Archive (MESSRS_0XXX) AAREADME.TXT 12 June 2015 Mark Perry Mike Reid Johns Hopkins University Applied Physics Laboratory ============================================================================= INTRODUCTION ============================================================================= This volume contains archival raw, and ancillary/supporting radio science data for the MESSENGER Radio Science investigations. The volume contains all the archived data, which includes data from the second flyby of Venus and all data captured from the MESSENGER spacecraft's trajectory correction maneuver (TCM) #19 in December 2007 through orbital operations which commenced in March 2011 and concluded on April 30, 2015. These data are contained in one volume. The radio observations were carried out using the MESSENGER Spacecraft and Earth-based receiving stations of the NASA Deep Space Network (DSN). ============================================================================= VOLUME INFORMATION ============================================================================= This volume is divided into five directories, which are CATALOG DOCUMENT INDEX ANCILLARY DATA There are four primary data types: the Orbit Data Files (ODFs), which are stored in the directory DATA/ODF/; the Tracking and Navigation Files (TNF), which are less compact than the TNFs and are stored in the directory DATA/TNF/; the Radio Science Receiver (RSR) data, which are used primarily for occultation analysis and are stored in the directory DATA/RSR/; and the DDOR data, which provide information on the spacecraft position normal to the line of sight and are stored in the DATA/DDOR directory. The primary data files are accompanied by secondary data files which are found in the ANCILLARY directory. These files include information on the antenna configurations and on maneuver performance. The Software Interface Specification (SIS), MESSENGER_EDR_SIS.HTM, contains a complete listing of all ancillary data, including data that are archived at other facilities such as the Navigation Ancillary Information Facility (NAIF). The CATALOG directory contains summary information on the MESSENGER mission, the spacecraft, radio science instrumentation, the data set, and listings of references and personnel. These files are structured to facilitate machine handling but are also intended to be human readable. Archive Volume Directory Structure ---------------------------------- --------- ------- ---- ----- -------- |ANCILLARY| |CATALOG| |DATA| |INDEX| |DOCUMENT| --------- ------- ---- ----- -------- | | | --------------------- --------- ------ | | | | | | | | | --- --- | --- --- --- | --- --------------- | |ANT| |MDM| | |ION| |LTF| |ODF| | |TNF| | DOCINFO.TXT |-- --- --- | --- --- --- | --- --------------- | | | | --------------------- --------- | | | | | | | | --- --- --- --- ---- --- --------------- | |MPD| |SFF| |TRO| |WEA| |DDOR| |RSR| | SIS Documents |-- --- --- --- --- ---- --- --------------- ============================================================================= ERRATA ============================================================================= A cumulative list of errors and changes is maintained in the ERRATA.TXT file. ============================================================================= DELIVERY FORMAT ============================================================================= The deliverable products are organized according to the PDS standard for a single volume. This file (AAREADME.TXT), a PDS volume object definition (VOLDESC.CAT), and the listing of errors and changes (ERRATA.TXT) are included at the root level. The following directories of descriptive material are also at the root level: CATALOG contains descriptive files for cataloging the data in this volume. DOCUMENT contains a plain text Software Interface Specification (SIS) for the data types that do not have a full PDS label. It also contains supporting documentation that are not specific to MESSENGER. (Some of the ancillary product directories contain *info.txt files, which provide additional information about the product.) INDEX contains index information on each of the data files included in this volume. ============================================================================= FILE FORMAT ============================================================================= All data files in the volume are accompanied by detached or attached PDS labels, which describe their contents. Detached labels have the same file name as the data file except that the label name has the suffix ".LBL". Detailed documentation on file structure and contents formatting is available for all file types either through complete PDS labels or through Software Interface Specifications (SISs) in the DOCUMENT directory. Text files (*.TXT file names) and catalog files (*.CAT file names) are stream files. ============================================================================= SOFTWARE ============================================================================= No software has been included as part of this archival product. ============================================================================= ACKNOWLEDGMENTS ============================================================================= These data were collected under the auspices of the MESSENGER Project. Members of the JPL Radio Science Systems Group (RSSG) involved in data acquisition included Daniel Kahan and Sami Asmar. ============================================================================= DISCLAIMER ============================================================================= Although considerable care has gone into making this volume, errors are both possible and likely. Users of the data are advised to exercise the same caution as they would when dealing with any other unknown data set. Reports of errors or difficulties would be appreciated. Please contact one of the persons listed below. ============================================================================= COGNIZANT PERSONNEL ============================================================================= The person most directly responsible for construction and release of this volume is Mark Perry, a staff scientist at the Johns Hopkins University Applied Physics Laboratory. Although many people contributed to the volume set, any faults in the product are his alone. Mark Perry MESSENGER RS Data Archive Task Lead Johns Hopkins University Applied Physics Laboratory 11100 Johns Hopkins Road Laurel, MD 20723 Tel: 240-228-0699 FAX: 240-228-8939 mark.perry@jhuapl.edu Mike Reid MESSENGER RS Data Archive Software Lead Johns Hopkins University Applied Physics Laboratory 11100 Johns Hopkins Road Laurel, MD 20723 Tel: 240-228-4537 mike.reid@jhuapl.edu ============================================================================= ACRONYMS AND ABBREVIATIONS ============================================================================= DDOR Delta Differential One-way Range DSN Deep Space Network JPL Jet Propulsion Laboratory NASA National Aeronautics and Space Administration NAIF Navigation Ancillary Information Facility ODF Orbit Data File (file and/or directory) RS Radio Science RSSG Radio Science Systems Group RSR Radio Science Receiver Data File (file and/or directory) SIS Software Interface Specification TCM Trajectory Correction Manuever TNF Tracking and Navigation Files