PDS_VERSION_ID                =  PDS3
PRODUCT_VERSION_ID            =  "1.0"
RECORD_TYPE                   =  UNDEFINED
MISSION_NAME                  =  "MESSENGER"
INSTRUMENT_HOST_NAME          =  "MESSENGER"
INSTRUMENT_HOST_ID            =  "MESS"
INSTRUMENT_NAME               =  "RADIO SCIENCE SUBSYSTEM"
INSTRUMENT_ID                 =  "RSS"
DSN_STATION_NUMBER            =  25
TARGET_NAME                   =  "MERCURY"
DATA_SET_ID                   =  "MESS-V/H-RSS-1-EDR-RAWDATA-V1.0"
PRODUCER_ID                   =  "DSN"
PRODUCT_ID                    =  "092811400SC236DSS25DDOR_234"
PRODUCT_TYPE                  =  TNF
FILE_NAME                     =  "092811400SC236DSS25DDOR_234.DAT"
PRODUCT_CREATION_TIME         =  2009-295T21:22:19
MISSION_PHASE_NAME            =  "MERCURY 3 FLYBY"
START_TIME                    =  2009-281T13:52:00
STOP_TIME                     =  2009-281T22:30:59
SPACECRAFT_CLOCK_START_COUNT  =  "N/A"
SPACECRAFT_CLOCK_STOP_COUNT   =  "N/A"
DESCRIPTION                   =  "
    Delta-Differential One-way Range (D-DOR) measurements compliment the
    normal Doppler and ranging data, which are best along the
    Earth-spacecraft line. D-DOR measurements provide measurements orthogonal
    to the Earth-spacecraft line, a measurement that is only inferred
    indirectly from Doppler and ranging measurements. The D-DOR measurements
    are largely independent of some common tracking and navigation errors
    such as media, station locations, UT1 and polar motion.  D-DORs are the
    difference between two Very Long Baseline Interferometer (VLBI)
    measurements of the spacecraft and a nearby quasar. In essence, this ties
    Earth-spacecraft direction to a quasar location in the plane-of-sky. This
    achieves highly-accurate measurements of the location of the spacecraft
    perpendicular to the line of sight, or the angular (not range) location of
    the spacecraft with respect to Earth.  Accuracies can be 10 nanoradians
    (1.5 km at 1AU) or better. A single D-DOR determines angle relative to one
    baseline. To get both declination and azimuth (location in two dimensions)
    requires different baselines such as Madrid-Goldstone (east-west) and
    Goldstone-Canberra (north-south).

   Format and content of the TNF data product are documented in:

                             820-013
                  Deep Space Mission System (DSMS)
                  External Interface Specification
                           JPL D-16765
                            TRK-2-34
              DSMS Tracking System Data Archival Format
                     Jet Propulsion Laboratory
                       4800 Oak Grove Drive
                     Pasadena, CA  91109-8099
                     Revision J:  May 31, 2007

   The PDS label described in Appendix B of the above document is
   inconsistent with current archiving standards of the Planetary
   Data System.  It has been replaced by the label you are now
   reading.  For more information, see

         Planetary Data System Standards Reference (version 3.8)
                    JPL Publication D-7669, Part 2
                       Jet Propulsion Laboratory
                          4800 Oak Grove Drive
                        Pasadena, CA  91109-8099

   Background information on the radiometric system may be found in:

             Formulation for Observed and Computed Values
           of Deep Space Network Data Types  for Navigation
                         by Theodore D. Moyer
                  JPL Publication 00-7, October 2000
      Monograph 2, Deep Space Communications and Navigation Series
                       Jet Propulsion Laboratory
                          4800 Oak Grove Drive
                        Pasadena, CA  91109-8099"

NOTE                          =  "The binary D-DOR TNF data begin at byte 494
from the beginning of the file.  The data are preceded by 15 lines of text
header containing metadata and CCSDS markers."
END