PDS_VERSION_ID = PDS3 RECORD_TYPE = FIXED_LENGTH RECORD_BYTES = 80 OBJECT = TEXT INTERCHANGE_FORMAT = ASCII PUBLICATION_DATE = 2004-08-14 NOTE = "N/A" END_OBJECT = TEXT END Mars Exploration Rover Radio Science Data Archive Surface Operations (MER2-M-RSS-1-EDR-V1.0) AAREADME.TXT 2004-08-14 W. M. Folkner Jet Propulsion Laboratory ============================================================================== INTRODUCTION ============================================================================== This compact disc contains archival raw radio science data and supporting media calibration acquired during the Mars Exploration Rover surface operations. The radio observations were carried out using the Earth- based receiving stations of the NASA Deep Space Network (DSN), providing measurements of the range-rate (Doppler) between Earth and MER2 and with the Mars Odyssey orbiter, providing measurements of the range-rate (Doppler) between MER2 and the Odyssey orbiter. ============================================================================== VOLUME SET INFORMATION ============================================================================== Each archive volume has the structure illustrated in the diagram below. The INDEX directory notes the volume location of all data files and calibration files. The MER2-Earth Doppler measurements are contained in the DSN Orbit Data Files (ODFs) in the ODF directory. The ODF files are binary files; the format is described in the associated LBL files. The MER2-Odyssey Doppler measurements are contained in the Ultra-High Frequency Doppler Files (UHFDs) in the UHF directory. The UHF files are spreadsheet files; the format is described in the associated LBL files. The MER2-DSN Doppler measurements need to be calibrated for media delays due to the Earth's troposphere and ionosphere. The CALIB directory contains these calibrations based on measurements made at the DSN stations. The troposphere calibrations are comprised of a seasonal model and daily corrections to the seasonal model produced for each tracking station. The ionosphere calibrations files are specifically produced for each MER tracking pass. The troposphere and ionosphere calibrations are collected into one file for each month. The diagram below shows the organization of each volume, starting from the root of the compact disc. root | |- AAREADME.TXT |- VOLDESC.CAT | |- CALIB | | | |- CALINFO.TXT Overview of Directory | |- DSN_2004_2006.TRO DSN seasonal troposphere calibration | |- DSN_mmmyyyy.TRO DSN daily troposphere corrections | |- MER2_mmmyyyy.ION DSN Ionosphere calibrations | |- *.LBL Detached PDS labels | |- CATALOG | | | |- CATINFO.TXT Streamlined PDS catalog files | |- RS_MER2_DS.CAT for mission, host, instrument, | |- RS_INST.CAT data set (files evolve as | |- MER2_INSTHOST.CAT mission progresses). | |- MISSION.CAT | |- PERSON.CAT | |- REF.CAT | |- DOCUMENT | | | |- DOCINFO.TXT Overview of directory | |- TRK_2_18.TXT ODF file format description | |- TRK_2_23.TXT Troposphere/ionosphere calibration format | |- UHFODP_S.ASC ASCII version of UHF file description | |- UHFODP_S.DOC Word version of UHF file description | |- UHFODP_S.LBL PDS label for UHF file description | |- INDEX | | | |- INDXINFO.TXT Overview of directory | |- INDEX.LBL Label to INDEX.TAB | |- INDEX.TAB List of data products | |- ODF | | | |- yyddd_ddd.DAT Binary tracking ODF data | |- *.LBL Detached PDS labels | |- UHF | | | |- ODYyyyyddd_S254.CSV Spreadsheet tracking UHF Doppler data | |- *.LBL Detached PDS labels | This volume contains data for the first 30 days of landed operations, January 4, 2004 to February 3, 2004. Future volumes will include data from later time periods. ============================================================================== FILE FORMAT ============================================================================== Measurement data and calibration files on the disc are accompanied by detached 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". Detached PDS labels for multi-file documents have distinctive file names ending with ".LBL". Detailed documentation on file structure is available for some file types in Software Interface Specifications in the DOCUMENT directory. ODF and UHF files have full PDS labels which describe format and content completely. For other file types, where no electronic version of the SIS was available, the PDS label provides a reference to a hard copy document. See the DESCRIPTION keyword in each PDS label. Text files, including data files of ASCII text and all labels (*.LBL files), are delimited with carriage-return (ASCII 13) line-feed (ASCII 10) pairs at the end of each line. Detached labels and text files (*.TXT file names) have fixed length records of 80 bytes to facilitate their use as either fixed-length record files or as stream files with carriage-return line-feed delimiters. ============================================================================== SOFTWARE ============================================================================== Software for parsing the binary data files has been developed at several institutions to support NASA flight projects. Because parsing must be done at the bit level and the code is usually written for a narrow platform-specific application, no software has been included as part of this archival product. ============================================================================== ACKNOWLEDGMENTS ============================================================================== These data were collected under auspices of the Mars Exploration Rover Project. Much of the format information and generation of file labels was done based on the work of Dick Simpson, Stanford University, who developed formats for the Mars Global Surveyor Project. At PDS the assistance of Betty Sword was appreciated. ============================================================================== DISCLAIMER ============================================================================== Although considerable care has gone into making this volume set, 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 the person listed below. ============================================================================== COGNIZANT PERSONNEL ============================================================================== William M. Folkner JPL m/s 238-600 4800 Oak Grove Dr. Pasadena, CA 91109 Tel: 818-354-0443 FAX: 818-393-4965 William.Folkner@jpl.nasa.gov