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Alarm suppressing system in aircraft collision avoidance system

  • US 4,978,945 A
  • Filed: 06/30/1989
  • Issued: 12/18/1990
  • Est. Priority Date: 10/17/1985
  • Status: Expired due to Fees
First Claim
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1. An alarm suppressing system for an aircraft collision avoidance system which has a function of determining whether or not a subject aircraft is in danger of colliding with other aircraft and which generates an alarm when it has determined that the subject aircraft is in danger of colliding with another aircraft, through utilization of a response signal received from said other aircraft, said alarm suppressing system comprising a filtering circuit and said collision avoidance system comprising:

  • a receiver for receiving at least said response signal from said other aircraft;

    a first encoder for encoding said received response signal into a required signal;

    an altitude information detector for detecting altitude information of said subject aircraft;

    a second encoder for encoding the output signal of said altitude information detector into a required signal;

    a first comparator for comparing the outputs of said first and second encoders;

    a collision avoidance system logic circuit which receives the output of said receiver via filtering circuit of said alarm suppressing system and determines whether or not said subject aircraft is in danger of midair collision with said other aircraft in accordance with said output of said receiver.said alarm suppressing system comprising;

    a second comparator for comparing the output of said first comparator and the output of said second encoder;

    said filtering circuit which is supplied with the output of said receiver and is controlled by the output of said second comparator;

    wherein when an altitude difference between said subject aircraft and said other aircraft is equal to the altitude of said subject aircraft and said other aircraft is at an altitude lower than said subject aircraft, it is determined that said subject aircraft is staying on the ground, and the generation of an alarm is prevented on the basis of said response signal received from said other aircraft.

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