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Collision predicting operation system

  • US 4,008,473 A
  • Filed: 01/14/1974
  • Issued: 02/15/1977
  • Est. Priority Date: 01/20/1973
  • Status: Expired due to Term
First Claim
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1. A collision predicting operation system comprising:

  • electromagnetic wave generating means whose oscillation frequency is varied in accordance with an input voltage thereto;

    antenna means for radiating said electromagnetic wave and for receiving a reflected wave reflected from a target due to the encounter of said electromagnetic wave with said target;

    means for causing said reflected wave to interfere with a part of said electromagnetic wave to generate a doppler signal;

    periodic wave generating means connected to said doppler signal generating means and including circuitry responsive only to a doppler signal having an amplitude higher than a predetermined value and a frequency within a predetermined range to produce a periodic wave synchronized with said doppler signal and having a rise portion occurring when the phase angle of the doppler signal is zero;

    frequency modulating means connected to said electromagnetic wave generating means and said periodic wave generating means, said frequency modulating means including circuit means response to the rise of said periodic wave for changing the input voltage to said electromagnetic wave generating means in synchronization with the occurrence of said zero phase angle of said doppler signal thereby changing the oscillation frequency of said electromagnetic wave generating means; and

    means for detecting the polarity and phase of the modulated portion of said doppler signal.

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