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Ground proximity warning system having modified terrain closure rate warning on glide slope approach

  • US 4,684,948 A
  • Filed: 07/08/1983
  • Issued: 08/04/1987
  • Est. Priority Date: 07/08/1983
  • Status: Expired due to Term
First Claim
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1. A ground proximity warning system for an aircraft comprising:

  • means responsive to a signal representative of the altitude of the aircraft above ground and to a signal representative of the terrain closure rate of the aircraft for generating a first signal when the terrain closure rate is within a predetermined envelope for the altitude at which the aircraft is flying;

    means responsive to a glid slope radio beam for generating a second signal if the aircraft deviates by more than a predetermined limit from the glide slope; and

    means for altering said predetermined envelope according to a predetermined relationship between the closure rate and the altitude of the aircraft above ground when said glide slope is detected and said aircraft has not deviated more than the predetermined limit from said glide slope.

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