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The Global Positioning System A Shared National Asset (1995) / Chapter Skim
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Pages 106-107

The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
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From page 106...
... Although these values would intuitively be lower than the 1 nautical miles terminal area protection limit value, availability improves for the 0.3 nautical miles non-precision protection limit because the barometric altimeter inputs improve in this phase of flight. Overall System Improvements Improved Monitor Station Receivers.
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From page 107...
... 4S Block IIR satellites have a military requirement to maintain a specified position accuracy for up to 180 days without clock and ephemeris updates from the MCS. This mode of operation is called autonomous navigation, or autonav.
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Key Terms

  • multipath error
  • monitor station
  • block iir
  • operational control
  • control segment

  • individual satellite
  • iir satellites
  • carrier phase
  • protection limit
  • station receivers

  • nautical mile
  • nautical miles
  • gps accuracy
  • monitor stations
  • satellite signals

  • multipath errors
  • force plans
  • pseudorange measurements
  • altimeter inputs
  • limit value

  • iir satellite
  • phase data
  • mask angle
  • control station
  • barometric altimeter

  • space command
  • backup master
  • clock offset
  • master control
  • availability improves


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