@prefix ns0: <http://gcmd.gsfc.nasa.gov/kms#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/a904ebc2-37ae-49ba-8655-f691dbb443c3>
  ns0:altLabel [ ] ;
  skos:definition """The GRACE Instrument Processing Unit (IPU) is part of the GRACE
      Instrument System (IS) consisting of an Ultrastable Oscillator (USO), a
      K-band Ranging Assembly (KBR), a Star Camera Assembly (SCA) and an
      Accelerometer (ACC). Most of these systems are fully redundant.

      The function of the IPU is to
      + receive, downconvert and digitize GPS signals,
      + extract observables from KBR and SCA and report,
      + provide timing reference to the satellite bus and ACC, and
      + calculate GPS navigation solution (position, velocity and time).

      [Summary from GRACE IPU Specification Document]


Group: Instrument_Details
   Entry_ID: IPU
   Group: Instrument_Identification
      Instrument_Category: Earth Remote Sensing Instruments
      Instrument_Class: Passive Remote Sensing
      Instrument_Type: Positioning/Navigation
      Short_Name: IPU
      Long_Name: Instrument Processing Unit
   End_Group
   Group: Associated_Platforms
      Short_Name: GRACE
   End_Group
   Online_Resource: http://www.csr.utexas.edu/grace/spacecraft/sis.html#sis2
   Online_Resource: http://www.csr.utexas.edu/grace/
   Online_Resource: http://nasascience.nasa.gov/missions/grace
   Online_Resource: http://podaac.jpl.nasa.gov/grace/
   Creation_Date: 2007-05-02
   Group: Instrument_Logistics
      Instrument_Owner: USA/NASA
   End_Group
End_Group"""@en ;
  skos:prefLabel "IPU"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/instruments> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/596a5700-b3fd-4261-b8f8-a054d052e3fe> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/596a5700-b3fd-4261-b8f8-a054d052e3fe>
  skos:prefLabel "Positioning/Navigation"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/a904ebc2-37ae-49ba-8655-f691dbb443c3> .