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Method of strip-map synthetic aperture radar auto-focus processing

  • US 8,102,299 B2
  • Filed: 10/26/2009
  • Issued: 01/24/2012
  • Est. Priority Date: 10/24/2008
  • Status: Active Grant
First Claim
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1. A method of strip-map synthetic aperture radar auto-focus image generation, comprising the steps of:

  • forming, by an image processing circuit, one or more batch images from batches of radar return data, said radar return data and batches of radar return data having a chronological order, wherein at least one batch image has a valid region abutted to a valid region of another batch image and an overlap region overlapped with the valid region of another batch image, the valid region of the one or another batch image being the portion of the batch image that is used to form a final strip-map image;

    for one or more batches of radar return data, performing the steps of;

    determining, by an image analysis circuit, an estimated first derivative of a phase error in a batch image, substantially at an end of the valid region;

    determining, by a time analysis circuit, a chronological shift corresponding to said first derivative at an end of the valid region; and

    determining, by a triggering circuit, a start of a next batch of radar return data dependent on said chronological shift.

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