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Portable FM-CW radar device with frequency conversion by first and second frequencies

  • US 5,381,153 A
  • Filed: 01/21/1994
  • Issued: 01/10/1995
  • Est. Priority Date: 08/08/1991
  • Status: Expired due to Term
First Claim
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1. A portable FM-CW radar device with transmit and receive antennas, comprising:

  • a transmitting oscillator operatively coupled to the transmit antenna to transmit a modulated high frequency transmit signal at a first frequency from the transmit antenna in range of a target object so that a reflected signal is reflected by the target object;

    modulation signal generating means for generating a second frequency which is far lower than the first frequency and twice as much as a Doppler frequency generated by a sum or difference of a relative velocity of the reflected signal and the transmit signal and a beat frequency generated by a sum or difference of the propagation delay time of the reflected signal and the transmit signal;

    a modulator operatively connected between said transmitting oscillator and the transmit antenna to modulate the transmit signal;

    first frequency converting means for frequency modulating the reflected signal reflected by the target object with the first frequency; and

    second frequency converting means for frequency modulating the reflected signal with the second frequency.

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