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Moving obstacle detection system for a vehicle

  • US 4,549,181 A
  • Filed: 09/29/1982
  • Issued: 10/22/1985
  • Est. Priority Date: 10/31/1981
  • Status: Expired due to Fees
First Claim
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1. A moving obstacle detection system for a vehicle, comprising:

  • (a) a Doppler radar transceiver for transmitting an electromagnetic radiation signal of known frequency, receiving the reflected radiation from moving objects within a specified detection area exposed to the transmitted radiation, and outputting a Doppler beat signal comprising a linear function of the transmitted and received radiation signals;

    (b) means responsive to said Doppler signal for indicating that an obstacle is moving towards or away from the vehicle when the rate of change of frequency of said Doppler signal exceeds a first predetermined value; and

    (c) inhibiting means responsive to said Doppler signal for preventing operation of said indicating means when the rate of change of frequency of said Doppler signal exceeds a second predetermined value exceeding the first predetermined value.

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