PDS_VERSION_ID        = PDS3
RECORD_TYPE           = FIXED_LENGTH
RECORD_BYTES          = 80
OBJECT                = TEXT
  INTERCHANGE_FORMAT    = ASCII
  PUBLICATION_DATE      = 2012-09-01
  NOTE                  = "N/A"
END_OBJECT            = TEXT

END

                Mars Exploration Rover Radio Science Data Archive
                           Surface Operations
                      (MER1-M-RSS-1-EDR-V1.0)

                              AAREADME.TXT
                              2012-09-01
                             W. M. Folkner
                       Jet Propulsion Laboratory


==============================================================================
INTRODUCTION
==============================================================================

The MER1 Radio Science EDR archive 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 MER1 and with the Mars Odyssey orbiter, providing measurements of the
range-rate (Doppler) between MER1 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 MER1-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.

No MER1-Odyssey Doppler measurements are included on this volume. They are
included on the previous volume, MER1RS_0001.

The MER1-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 this volume, starting from
the volume root.

           root
            |
            |- AAREADME.TXT               Overview of archive (this file)
            |- ERRATA.TXT                 Release notes and errata, if any
            |- VOLDESC.CAT                Volume description for PDS catalog
            |
            |- CALIB
            |     |
            |     |- CALINFO.TXT          Overview of Directory
            |     |- ION                  Directory of ionosphere calibrations
            |     |   |- MER1_mmmyyyy.ION DSN Ionosphere calibrations
            |     |   |- *.LBL            PDS labels for each data file
            |     |- TRO
            |         |- DSN_mmmyyyy.TRO DSN daily troposphere corrections
            |         |- SEASONAL.TRO    DSN seasonal troposphere calibration
            |         |- *.LBL           PDS labels for each data file
            |
            |- CATALOG
            |     |
            |     |- CATINFO.TXT         Overview of directory
            |     |- RS_MER1_DS.CAT      Data set description for PDS catalog
            |     |- RS_INST.CAT         Instrument description
            |     |- MER1_INSTHOST.CAT   Spacecraft description
            |     |- MISSION.CAT         Mission description
            |     |- PERSON.CAT          Personnel contact information
            |     |- REF.CAT             References
            |
            |- DOCUMENT
            |     |
            |     |- DOCINFO.TXT     Overview of directory
            |     |- TRK_2_18.TXT    ODF file format description
            |     |- TRK_2_23.TXT    Troposphere/ionosphere calibration format
            |
            |- INDEX
            |     |
            |     |- INDXINFO.TXT    Overview of directory
            |     |- INDEX.LBL       Label of INDEX.TAB
            |     |- INDEX.TAB       List of data product on this volume
            |     |- CUMINDEX.LBL    Label pf CUMINDEX.TAB
            |     |- CUMINDEX.TAB    List of data products on all RSS volumes
            |
            |- ODF
                  |
                  |- yyddd_ddd.DAT   Binary tracking ODF data
                  |- *.LBL           Detached PDS labels

This volume contains ODFs and associated calibration data from December 2011
through May 2012. The rover was stationary from December 25, 2011, through
May 7, 2012.

The low gain antenna (LGA) is fixed with respect to the rover. The LGA is 66 
cm above the rover main deck. The high gain antenna (HGA) is 28 cm in 
diameter and mounted on an arm which rotates in azimuth and elevation with 
respect to the rover, with the antenna boresight 33 cm from the pivot rigidly 
mounted to the rover.  The HGA moves with respect to the rest of the rover 
during the tracking pass to remain pointed at Earth. As a consequence of the 
HGA motion, the distance from Earth to the antenna pivot point remains the 
same as the distance from Earth to the HGA during the tracking pass. So the 
effect of the HGA motion on the Doppler measurements is negligible.

The following table entails whether the rover was transmitting on the
high gain antenna (HGA) or the log gain antenna (LGA) during the times of the
archived closed-loop data.

/----------------------\
| 11337_337.DAT  | HGA |
| 11342_342.DAT  | LGA |
| 11345_345.DAT  | LGA |
| 11347_347.DAT  | HGA |
| 11349_349.DAT  | LGA |
| 11354_354.DAT  | LGA |
| 11355_355.DAT  | LGA |
| 11356_356.DAT  | LGA |
| 11363_363.DAT  | LGA |
| 12002_002.DAT  | HGA |
| 12005_005.DAT  | HGA |
| 12005_006.DAT  | HGA |
| 12007_007.DAT  | LGA |
| 12008_008.DAT  | HGA |
| 12010_010A.DAT | HGA |
| 12010_010B.DAT | LGA |
| 12011_011.DAT  | HGA |
| 12012_013.DAT  | LGA |
| 12013_013.DAT  | HGA |
| 12015_015.DAT  | HGA |
| 12016_016.DAT  | HGA |
| 12018_018.DAT  | HGA |
| 12020_020A.DAT | LGA |
| 12020_020.DAT  | HGA |
| 12021_021.DAT  | LGA |
| 12024_024.DAT  | HGA |
| 12027_027.DAT  | HGA |
| 12030_030.DAT  | HGA |
| 12031_031A.DAT | LGA |
| 12031_031B.DAT | HGA |
| 12032_032.DAT  | HGA |
| 12033_033.DAT  | HGA |
| 12035_035A.DAT | LGA |
| 12035_035B.DAT | HGA |
| 12036_036.DAT  | HGA |
| 12040_040.DAT  | LGA |
| 12041_041.DAT  | HGA |
| 12042_042.DAT  | LGA |
| 12044_044.DAT  | LGA |
| 12045_045.DAT  | LGA |
| 12047_047.DAT  | HGA |
| 12049_049.DAT  | HGA |
| 12051_051.DAT  | HGA |
| 12054_054.DAT  | HGA |
| 12055_055.DAT  | HGA |
| 12056_056.DAT  | HGA |
| 12058_058.DAT  | HGA |
| 12059_059.DAT  | HGA |
| 12060_060.DAT  | LGA |
| 12061_061.DAT  | HGA |
| 12062_062.DAT  | HGA |
| 12064_064.DAT  | HGA |
| 12066_066.DAT  | HGA |
| 12067_067.DAT  | HGA |
| 12070_070.DAT  | LGA |
| 12071_071.DAT  | HGA |
| 12073_073.DAT  | LGA |
| 12074_074.DAT  | HGA |
| 12076_076.DAT  | HGA |
| 12077_077.DAT  | LGA |
| 12078_078.DAT  | HGA |
| 12080_080.DAT  | LGA |
| 12081_081.DAT  | HGA |
| 12082_082.DAT  | LGA |
| 12084_085.DAT  | HGA |
| 12085_085.DAT  | HGA |
| 12089_089.DAT  | HGA |
| 12091_091.DAT  | HGA |
| 12094_094.DAT  | HGA |
| 12095_095.DAT  | HGA |
| 12098_098.DAT  | HGA |
| 12100_100.DAT  | HGA |
| 12102_102.DAT  | LGA |
| 12103_103.DAT  | HGA |
| 12104_104.DAT  | HGA |
| 12105_105.DAT  | LGA |
| 12106_106.DAT  | HGA |
| 12107_107.DAT  | HGA |
| 12109_109.DAT  | HGA |
| 12110_110.DAT  | LGA |
| 12113_113.DAT  | HGA |
| 12115_115.DAT  | HGA |
| 12117_117.DAT  | HGA |
| 12118_118.DAT  | HGA |
| 12119_119.DAT  | HGA |
| 12120_120.DAT  | HGA |
| 12124_124.DAT  | HGA |
| 12125_125.DAT  | HGA |
| 12126_126.DAT  | HGA |
| 12127_127.DAT  | LGA |
| 12131_131.DAT  | HGA |
| 12132_132.DAT  | LGA |
| 12133_133.DAT  | HGA |
| 12136_136.DAT  | LGA |
| 12137_137.DAT  | LGA |
| 12138_138.DAT  | LGA |
| 12140_140.DAT  | HGA |
| 12143_143.DAT  | HGA |
| 12145_145.DAT  | LGA |
| 12147_147.DAT  | LGA |
| 12149_149.DAT  | HGA |
| 12152_152.DAT  | LGA |
\----------------------/

==============================================================================
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
