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MODULATION CORRELATED FM RANGING SYSTEM

  • US 3,623,097 A
  • Filed: 07/17/1969
  • Issued: 11/23/1971
  • Est. Priority Date: 07/17/1969
  • Status: Expired due to Term
First Claim
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1. A frequency-modulated system for use as a distance measuring device comprising, in combination:

  • a. signal-generating means for producing a voltage waveform for use as a modulating signal and as a reference signal, b. transmitting means responsive to said modulating signal for producing a frequency-modulated signal and propagating said frequency-modulated signal toward a target area, c. receiving means for receiving said frequency-modulated signal from said target area, d. frequency-comparing means for comparing the frequencies of said received signal and said transmitted signal and for producing A first output signal whose polarity is based on said comparison, e. correlating means for correlating said first output signal with said reference signal and producing a second output signal whenever a target is in the said target area.

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