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Collision avoidance system for aircraft

  • US RE32,368 E
  • Filed: 06/14/1984
  • Issued: 03/10/1987
  • Est. Priority Date: 08/15/1975
  • Status: Expired due to Term
First Claim
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2. said one aircraft..]. .Iadd.12. A collision avoidance system for aircraft which are each equipped with an ATC transponder comprising:

  • an interrogation station located on a first aircraft and having a secondary surveillance radar function, said interrogation station emitting an interrogation signal which is to be responded to by an ATC transponder of a second aircraft;

    a detection means located on said first aircraft for detecting the existence of said second aircraft in proximity to said first aircraft;

    an output control means operatively connected to said detection means for altering at least one of an output power and a transmission period of said interrogation signal emitted by said interrogation station when said detection means detects information concerning said second aircraft which exceeds a predetermined value. .Iaddend. .Iadd.13. A collision avoidance system as recited in claim 12, wherein said detection means deduces distance between said first and second aircraft by detecting a time difference between reception of a second interrogation signal by said first aircraft which has been sent from a ground secondary surveillance radar and a response signal sent from said ATC transponder located on said second aircraft, said response signal being generated in response to said second interrogation signal. .Iaddend. .Iadd.14. A collision avoidance system as recited in claim 12, wherein said detection means deduces distance between said first and second aircraft by detecting a time difference between transmission of said interrogation signal sent from said interrogation station located on said first aircraft and a response signal sent from said ATC transponder located on said second aircraft, said response signal being generated in response to said interrogation

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