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Method for the improved utilization of response signals in a _secondary radar system and a secondary radar system for implementing the method

  • US 4,174,519 A
  • Filed: 10/23/1978
  • Issued: 11/13/1979
  • Est. Priority Date: 10/26/1977
  • Status: Expired due to Term
First Claim
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1. A method for the improved utilization of response signals transmitted by receivers aboard aircraft in the vicinity of a ground-based secondary radar station transmitting interrogating signals consisting of time-spaced pulse pairs, the time interval T between the pulses of a pair being characteristic of the interrogation, the airborne receivers being of the type providing response signals to all interrogation signals have a time interval T comprised in a nominal time interval, response signals to a percentage of interrogation signals for ranges of time intervals T greater and/or lesser than the nominal time interval and no responses to interrogation signals having time intervals beyond predetermined limits,the improvement comprising varying the time interval T between the pulses of an interrogation signal as a function of the number of response signals and/or the time relationship of the response signals received at the ground-based radar station from the airborne responders so as to improve the overall reception decoding of response signals in accordance with air traffic conditions by taking advantage of variations in the response signal rate as a result of variations of the time interval T.

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