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WARNING INDICATOR TO ALERT AIRCRAFT PILOT TO PRESENCE AND BEARING OF OTHER AIRCRAFT

  • US 3,792,472 A
  • Filed: 08/14/1972
  • Issued: 02/12/1974
  • Est. Priority Date: 08/14/1972
  • Status: Expired due to Term
First Claim
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1. A pilot warning indicator installed in a first aircraft for alerting the pilot thereof to the presence of other aircraft at substantially the altitude of said first aircraft and for indicating the relative bearing to such other aircraft, said other aircraft being equipped with transponders for replying to interrogation signals, comprising:

  • a receiver having first, second and third antenna means for receiving transponder reply signals from said other aircraft;

    said third antenna means including an array of antennas and feed means therefor whereby signals from said third antenna means vary in phase according to the bearing of said other aircraft relative to said first aircraft;

    means for combining signals from said first and second antenna means so as to accept and further process said reply signals from other aircraft located within a limited space above and below the pitch plane of said first aircraft and to reject said replay signals from other aircraft located outside said limited space;

    means for comparing the phase of signals accepted by said combining means with corresponding signals received by said third antenna means to provide information of the bearing of said other aircraft within said limited space relative to said first aircraft; and

    , means for displaying said bearing information to the pilot thereby directing his attention to a region in space containing said other aircraft.

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