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<Product_Collection
   xmlns="http://pds.nasa.gov/pds4/pds/v1"
   xmlns:pds="http://pds.nasa.gov/pds4/pds/v1" 
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   xsi:schemaLocation="
      http://pds.nasa.gov/pds4/pds/v1
      https://pds.nasa.gov/pds4/pds/v1/PDS4_PDS_1D00.xsd
    ">
  <Identification_Area>
    <logical_identifier>urn:nasa:pds:mess-rs-raw:calib</logical_identifier>
    <version_id>1.0</version_id>
    <title>MESSENGER Radio Science Calibration Data Products Collection</title>
    <information_model_version>1.13.0.0</information_model_version>
    <product_class>Product_Collection</product_class>
    <Citation_Information>
      <author_list>Simpson, R. A.</author_list>
      <publication_year>2020</publication_year>
      <description>
          This calibration collection contains data products which support the 
          MESSENGER Radio Science Subsystem (RSS) raw data archive.
      </description>
    </Citation_Information>
    <Modification_History>
      <Modification_Detail>
        <modification_date>2022-05-20</modification_date>
        <version_id>1.0</version_id>
        <description>
          Collection of MESSENGER radio science calibration files.
          Created for migration of radio science data from PDS3 to PDS4.
        </description>
      </Modification_Detail>
    </Modification_History>  
  </Identification_Area>
  
  <Context_Area>
    <Time_Coordinates>
      <start_date_time>2006-01-10T15:00:05.829Z</start_date_time>
      <stop_date_time>2015-05-10T23:59:59.999Z</stop_date_time>
    </Time_Coordinates>
    <Primary_Result_Summary>
      <purpose>Calibration</purpose>
      <processing_level>Calibrated</processing_level>
    </Primary_Result_Summary>
    <Investigation_Area>
      <name>NASA Deep Space Network Media Calibration</name>
      <type>Other Investigation</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:investigation:other_investigation.media.dsn</lid_reference>
        <reference_type>collection_to_investigation</reference_type>
      </Internal_Reference>
    </Investigation_Area>
    <Investigation_Area>
      <name>MErcury Surface, Space ENvironment, GEochemistry, and Ranging Mission</name>
      <type>Mission</type>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:investigation:mission.messenger</lid_reference>
        <reference_type>collection_to_investigation</reference_type>
      </Internal_Reference>
    </Investigation_Area>
    
    <Observing_System>
      <Observing_System_Component>
        <name>NASA Deep Space Network</name>
        <type>Observatory</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:facility:observatory.dsn</lid_reference>
          <reference_type>is_facility</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
      <Observing_System_Component>
        <name>DSN Media Calibration Instrumentation</name>
        <type>Instrument</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument:dsn.media</lid_reference>
          <reference_type>is_instrument</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
      <Observing_System_Component>
        <name>MESSENGER</name>
        <type>Spacecraft</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.mess</lid_reference>
          <reference_type>is_instrument_host</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
      <Observing_System_Component>
        <name>RSS</name>
        <type>Instrument</type>
        <Internal_Reference>
          <lid_reference>urn:nasa:pds:context:instrument:rss.mess</lid_reference>
          <reference_type>is_instrument</reference_type>
        </Internal_Reference>
      </Observing_System_Component>
    </Observing_System>
    <Target_Identification>
      <name>Earth</name>
      <type>Planet</type>
      <description>
          Dual-frequency GPS radio signals penetrate the terrestrial ionosphere and
          troposphere and meteorological data characterize ground level conditions, 
          both providing information on path delay that can be used to calibrate
          ranging and Doppler data.
      </description>     
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:target:planet.earth</lid_reference>
        <reference_type>collection_to_target</reference_type>
      </Internal_Reference>
    </Target_Identification>
    <Target_Identification>
      <name>MESSENGER</name>
      <type>Equipment</type>
      <description>
        The spacecraft propulsion system is the source of SFF and maneuver performance data.
        The spacecraft downlink engineering data stream is the source of antenna configuration data.
      </description>
      <Internal_Reference>
        <lid_reference>urn:nasa:pds:context:instrument_host:spacecraft.mess</lid_reference>
        <reference_type>collection_to_target</reference_type>
      </Internal_Reference>
    </Target_Identification>
  </Context_Area>
  
  <Collection>
    <collection_type>Data</collection_type>
    <description>
      This collection contains various calibration data products:

      (1) Antenna configuration state files:  The MESSENGER project produces 
          antenna configuration data from each contact for which they
          are available. They give the state of the antenna. The data
          file is accompanied by detached full PDS label. The file
          contains antenna configuration status indicators. For each
          day, there is an entry at 00:00 that describes the antenna
          configuration at the start of the day, and additional
          entries for each change in the antenna configuration. This
          product is cumulative over the course of the mission.

      (2) Ionosphere Calibration Files: These files are DSN TRK-2-23 Media
          Calibration files.  These provide ionospheric calibration
          information.  They are of two types, Doppler and range
          data and Delta Differenced One-way Ranging (VLBI).  The
          file naming convention differs from the others in that
          the stop date contains only the day of year (not the year)
          and 'tt' is either VL for the VLBI files and DP for the
          Doppler and range files.  These are generated periodically
          by the DSMS and provided by JPL.
                                  
      (3) Light Time Files: These files provide one way light
          travel time values for both the upleg and downleg
          directions between the MESSENGER spacecraft and the three
          Deep Space Communications Complex (DSCC) facilities.
                        
      (4) Momentum Dump Maneuver files: This is a cumulative file
          that contains angular momentum dump data associated with
          each propulsive event. It is updated with each release and
          the newer version replaces the older one.

      (5) Maneuver Performance Data Files:  These are generated by the MESSENGER
          project when there is a propulsive event.  These contain
          estimates of spacecraft mass and center of mass; moments
          of inertia; thruster locations, directions, and
          magnitudes; and propellant flow rate.   
                                  
      (6) Small Forces Files:  These are generated by the MESSENGER
          project when there is a propulsive event.  They give
          information on the cumulative delta-V effect on the
          spacecraft due to thruster firing, mass loss due to the
          expenditure of propellant, and cumulative on-times for
          each individual thruster.
          
      (7) Troposphere Calibration Files: These files are DSN TRK-2-23 Media
          Calibration files.  These provide tropospheric calibration
          information.  These are generated periodically by the DSMS
          and provided by JPL.
            
      (8) DSN Weather Files: These files are DSN TRK-2-24 Weather files.  They give
          information about the weather conditions at a given DSCC.
          The file naming convention differs from the others in that
          the stop date contains only the day of year (not the year)
          and 'ss' is the DSCC number (10 - Goldstone, 40 - Canberra,
          60 - Madrid).  These are generated periodically by the
          DSMS and provided by JPL.
          
      </description>
  </Collection>
  
  <File_Area_Inventory>
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      <file_name>collection_mess-rs-raw_calib.csv</file_name>
      <creation_date_time>2020-10-20T02:29:14Z</creation_date_time>
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      <offset unit="byte">0</offset>
      <parsing_standard_id>PDS DSV 1</parsing_standard_id>
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</Product_Collection>
