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Method of correcting rotational motion error in SAR and ISAR imagery

  • US 5,250,952 A
  • Filed: 07/01/1991
  • Issued: 10/05/1993
  • Est. Priority Date: 07/01/1991
  • Status: Expired due to Fees
First Claim
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1. A method of correcting rotational motion error in SAR and ISAR imagery, comprising the steps of:

  • shifting the center of the image of a target to zero doppler and thus at the center of rotation of the target being imaged;

    selecting a dominant scatterer in a range cell to provide a phase reference;

    calculating the rotational motion error function from the phase reference provided by the selected scatterer;

    interpolating raw radar return image data between the original unequal angular samples by using the rotational motion error function to obtain equal angular samples of a reflectivity function for the target; and

    performing an image quality check to produce a value which constitutes a relative measure of focus of the corrected image.

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