System and method for assisting the prevention of controlled flight into terrain accidents

  • US 6,122,570 A
  • Filed: 06/19/1998
  • Issued: 09/19/2000
  • Est. Priority Date: 07/31/1995
  • Status: Expired due to Term
First Claim
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1. A system for assisting in the prevention of controlled flight into terrain accidents comprising:

  • (a) a database of stored terrain information;

    (b) a signal processing device, coupled to receive signals representative of a position of the aircraft, a flight path of an aircraft and a speed of the aircraft, and coupled to said database, for;

    (i) defining a look ahead distance as a function of the speed of the aircraft;

    (ii) defining a first alert envelope, indicative of a first severity of terrain threat, wherein boundaries of said first alert envelope are determined as a first function of the flight path angle, said look ahead distance, and a terrain floor boundary;

    (iii) defining a second alert envelope, indicative of a second severity of terrain threat, wherein boundaries of said second alert envelope are determined as a second function of the flight path angle, said look ahead distance and said terrain floor boundary; and

    (iv) outputting an alert signal when a subset of the stored terrain information is located with in the boundaries of at least one of said first and said second alert envelopes; and

    (c) a display, coupled to receive a subset of said terrain information, for displaying terrain in a vicinity of the aircraft.

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