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Inexpensive monitoring technique for achieving high level integrity monitoring for differential GPS

  • US 5,969,670 A
  • Filed: 01/22/1998
  • Issued: 10/19/1999
  • Est. Priority Date: 01/22/1998
  • Status: Expired due to Term
First Claim
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1. An integrity monitor global positioning system (GPS) navigation system, comprising:

  • a primary GPS receiver adapted to determine a first position, said primary GPS receiver certified to a first certification level, said primary GPS receiver further adapted to provide GPS navigation data; and

    a secondary GPS receiver coupled to said primary GPS receiver, said secondary GPS receiver certified to a second certification level having less stringent requirements than said first certification level, said secondary GPS receiver adapted to determine a second position and monitor said primary GPS receiver to detect a fault condition by comparing said first position and said second position, such that said secondary GPS, receiver ensures the integrity of said primary GPS receiver and ensures said GPS navigation data is provided in accordance with said first certification level.

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