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ADAPTIVE SWEPT-FREQUENCY ACTIVE RADAR SEEKER

  • US 3,728,724 A
  • Filed: 02/12/1971
  • Issued: 04/17/1973
  • Est. Priority Date: 02/12/1971
  • Status: Expired due to Term
First Claim
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1. In an active radar seeker, the combination comprising:

  • a. a microwave energy generating means for generating continuour wave microwave energy, b. transmitting circuit means and receiving circuit means coupled to said microwave energy generating means for transmitting microwave energy in the direction of a target to be detected and for receiving microwave energy reflected from the target to be detected, c. an offset frequency oscillator for generating a desired offset frequency signal, d. two frequency tripler circuits connected in series and to said offset oscillator for providing an output signal nine times the offset frequency signal, e. a first mixer circuit coupled to the output of said frequency triplers and to said microwave energy generating means for generating a first intermediate frequency, f. three frequency doubler circuits connected in series and to said offset oscillator for providing an output signal eight times the offset frequency signal, g. a second mixer circuit coupled to the output of said frequency doubler circuits and to the output of said first mixer circuit for providing the heterodyning signal at the desired offset frequency to said transmitting and receiving circuit means, h. a sweep generator coupled to said microwave energy generating means for controlling the output frequency of said microwave energy, i. circuit control means coupled to said sweep generator and to said transmitting and receiving circuit means and being responsive to a measure of the distance to the target reflecting the transmitted energy for controlling the amplitude and frequency of the sweep generator output voltage.

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