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Collision avoidance system for aircrafts

  • US 4,107,674 A
  • Filed: 08/13/1976
  • Issued: 08/15/1978
  • Est. Priority Date: 08/15/1975
  • Status: Expired
First Claim
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1. A collision avoidance system for aircraft each equipped with an ATC transponder comprising;

  • an interrogation station mounted on one aircraft, having secondary surveillance radar function emitting an interrogation signal to be responded to by the ATC transponder of a second aircraft,coarse detection means on said one aircraft for detecting the existence of the second aircraft in proximity to said one aircraft, andoutput control means for altering at least one of output power and transmission period of the interrogation signal so as to effect fine detection of said second aircraft when said coarse detection means delivers a signal representing information concerning said second aircraft which exceeds a certain value.

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