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Synthetic aperture radar processor to handle large squint with high phase and geometric accuracy

  • US 5,179,383 A
  • Filed: 07/15/1991
  • Issued: 01/12/1993
  • Est. Priority Date: 07/15/1991
  • Status: Expired due to Fees
First Claim
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1. A digital signal processing method for focusing samples of two-dimensional signals reflected form targets in a synthetic aperture radar or analogous system, the samples representing azimuth lines (columns) and range lines (rows), the method comprising the steps of:

  • (a) transforming the azimuth lines from the signal domain to the frequency domain;

    (b) rotating the phase of each sample in the range-signal, azimuth-frequency domain to make the zero-range-frequency loci of each target congruent with each other target;

    (c) transforming the range lines form the signal domain to the frequency domain;

    (d) rotating the phase of each sample in the range-frequency, azimuth-frequency domain so that after step (e) the range energy is focused, and aligned in the azimuth direction;

    (e) transforming the range lines from the frequency domain to the image domain;

    (f) rotating the phase of each sample in the range-image, azimuth-frequency domain, so that after step (g) the azimuth energy is focused; and

    (g) transforming the azimuth lines from the frequency domain to the image domain.

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