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Aircraft collision warning system

  • US 3,114,147 A
  • Filed: 08/04/1959
  • Issued: 12/10/1963
  • Est. Priority Date: 08/04/1959
  • Status: Expired due to Term
First Claim
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1. IN COMBINATION, A COLLISION WARNING SYSTEM COMPRISING:

  • A SOURCE OF CARRIER FREQUENCY ENERGY;

    A SOURCE OF SINUSOIDAL SIGNAL;

    A MODULATOR FOR FREQUENCY-MODULATING SAID ENERGY WITH SAID SIGNAL;

    MEANS FOR RADIATING SAID FREQUENCYMODULATED ENERGY TOWARD A MOVING TARGET;

    MEANS FOR RECEIVING REFLECTIONS OF SAID ENERGY FROM SAID MOVING TARGET;

    MEANS FOR COMPARING THE MEDIAN FREQUENCY OF SAID RADIATED ENERGY WITH SAID REFLECTED ENERGY, AND FOR DERIVING A VOLTAGE PROPORTIONAL TO THE DIFFERENCE BETWEEN THE MEDIAN FREQUENCY OF SAID RADIATED ENERGY AND THE FREQUENCY OF SAID REFLECTED ENERGY;

    MEANS FOR COMPARING THE PHASE OF SAID SIGNAL WITH THE PHASE OF THE MODULATION SIGNAL OF SAID REFLECTED ENERGY, AND FOR DERIVING A VOLTAGE PRO-

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