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FFT-based aperture monitor for scanning phased arrays

  • US 4,926,186 A
  • Filed: 03/20/1989
  • Issued: 05/15/1990
  • Est. Priority Date: 03/20/1989
  • Status: Expired due to Fees
First Claim
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1. The method of monitoring the performance of a scanning phased array antenna to identify faults in said antenna, said antenna having a plurality of radiating elements and plurality of phase shifters associated with said elements to control the direction of a beam of energy transmitted by said radiating elements, said antenna scanning between the maximum angles of +θ

  • o and -θ

    o, θ

    being the angle between the axis of said beam and the normal to the axis of the array of said antenna, comprising;

    collecting, from a single detector of signals transmitted by said antenna, at equal increments of arcsin θ

    , a plurality of signal samples;

    analyzing said collected samples by means of a Fourier transform to provide a sequence of data indicating the amplitude and phase of the signal radiated by each of said antenna radiating elements when the beam of said antenna was directed toward said detector; and

    comparing the data of said sequence with known values of the amplitude and phase of the signal radiated by each of the radiating elements of said antenna when said antenna is perfectly functioning and the beam thereof is directed toward said detector.

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