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System for monitoring aircraft position

  • US 5,262,784 A
  • Filed: 06/15/1992
  • Issued: 11/16/1993
  • Est. Priority Date: 06/15/1992
  • Status: Expired due to Fees
First Claim
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1. A system for generating signals which identify aircraft which are on the ground comprising:

  • an IFF transponder on board said aircraft, having an antenna input for receiving ground initiated interrogation pulse, and issuing a reply transmission in response thereto;

    a directional coupler means having one port connected to said transponder antenna input, and two additional ports one of which is connected to an antenna of said aircraft for receiving said interrogation pulses;

    a DME suppression circuit for supplying a signal to said IFF transponder for inhibiting replies of said transponder;

    landing gear detection means for providing a signal indicating that said aircraft is on the ground; and

    ,circuit means connected to receive said landing gear detection means signal and said DME suppression circuit signal, said circuit means supplying a DME inhibit signal to said IFF transponder and a suppression signal to a remaining port of said directional coupler means to suppress interrogation of said transponder by ground-initiated interrogation pulses, and for introducing interrogation pulses to said IFF transponder at a rate less than the rate of said ground interrogation pulses.

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