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Transponder landing system

  • US 6,469,654 B1
  • Filed: 10/24/2000
  • Issued: 10/22/2002
  • Est. Priority Date: 05/09/2000
  • Status: Expired due to Term
First Claim
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1. A method of determining a position of an aircraft having a transponder which transmits a reply signal in response to an interrogation signal, the method comprising:

  • receiving the reply signal on a plurality of antennas disposed as a vertically oriented array;

    estimating a position of the aircraft from the received reply signal;

    determining selected characteristics of the reply signal; and

    , analyzing the selected characteristics to determine whether selected reply signals originate from different antennas on the aircraft.

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