| 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
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