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Integrity monitoring method and apparatus for GPS and DGPS receivers

  • US 5,663,732 A
  • Filed: 05/25/1995
  • Issued: 09/02/1997
  • Est. Priority Date: 05/25/1995
  • Status: Expired due to Term
First Claim
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1. In combination with an aircraft being controlled to move along a desired trajectory:

  • a first GPS system operable to receive signals from a plurality of satellites and to produce a first signal indicative of the aircraft position and a second signal indicative of a departure of the aircraft from a desired trajectory which is greater than a predetermined amount;

    a second GPS system operable to receive signals from the plurality of satellites and to produce a first signal indicative of the aircraft position and a second signal indicative of the departure of the aircraft from a desired trajectory which is greater than the predetermined amount;

    means transmitting only one of the first signals to the aircraft to provide position information thereto;

    an alarm; and

    means transmitting the second signal of both the first and second GPS systems to the alarm so that an alarm will occur whenever the aircraft departs from the desired trajectory by more than the predetermined amount.

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