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Method and apparatus for identifying radar targets

  • US 4,633,251 A
  • Filed: 09/15/1983
  • Issued: 12/30/1986
  • Est. Priority Date: 09/18/1982
  • Status: Expired due to Term
First Claim
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1. A method of identifying a selected radar target from a plurality of other such targets which method comprises:

  • transmitting from a base station an initial interrogation radar signal;

    receiving the initial interrogation radar signal at the selected radar target and said other such radar targets;

    applying said signal to a responder of each said radar target thereby causing the responder to generate a monitor response signal with a pulse separation not less than the duration of an identification signal;

    receiving at each said radar target one or more monitor response signals from the responders of any other said radar targets;

    detecting at each said radar target any monitor response signals received partly overlapping the monitor response signal of any of said radar targets and setting a garble flag means thereat;

    detecting at said base station any garbling between monitor response signals received from the selected radar target and any other such radar target;

    transmitting from said base station a suppression radar signal for suppressing any radar target having garble flag means conditions different from the garble flag means condition of said selected radar target;

    receiving said suppression radar signal at at least one said other such radar target and suppressing such radar target;

    repeating, if necessary, the suppression radar signal transmission until all said other such radar targets have been suppressed;

    transmitting from the base station a first, identification signal seeking, interrogation radar signal;

    receiving the first interrogation radar signal at the target, applying said interrogation radar signal to the responder thereof, thereby causing the responder to generate a first identification signal containing a first portion of data concerning the specific individual identity of the target;

    transmitting the first identification signal from the target;

    receiving the first identification signal at the base station;

    transmitting from the base station, in response to receipt of said first identification signal, at least a second, identification signal seeking, interrogation radar signal;

    receiving the at least second interrogation radar signal at the target, applying said second interrogation radar signal to the responder, thereby causing the responder to generate at least a second identification signal containing additional data concerning the specific individual identity of the target;

    transmitting the at least second identification signal from the target;

    receiving the at least second identification signal at the base station; and

    processing the identification signals received by the base station so as to produce a signal containing all of the data concerning the specific individual identity of the target.

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