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High speed synthetic radar processing system

  • US 4,910,520 A
  • Filed: 07/30/1987
  • Issued: 03/20/1990
  • Est. Priority Date: 04/08/1985
  • Status: Expired due to Fees
First Claim
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1. The method of partitioning and processing data in a synthetic aperture radar mapping system for use with a moving craft receiving a time sequence of pulse return data from each of a plurality of pulses sequentially transmitted at a predetermined PRF to a surface being mapped and having range and cross range dimensions, the return data from each transmitted pulse being sequentially sampled to form sequence of sample words at a rate determined by the radar PRF, said surface including swaths each divided into range subswaths with each subswath including adjacent cross range patches with corresponding patches in all subswaths forming columns in range, said system forming a sequence of sampled data from the pulse return data from each transmitted pulse, said method comprising the steps of:

  • dechirping said sequences of sampled data for each subswath into a plurality of doppler frequency bands, each representing a patch filter band;

    patch filtering said sequences of sampled data for each subswath to pass data in said patch filter band with said sequences of data for each patch passing through one of said filter bands, wherein said patch filtering includes the steps of;

    skipping a selected number of sequences of sampled data to provide a reduced number of sequences of sampled data for each patch, anddata turning the reduced number of sequences of sampled data to provide one half of the sequences of sampled data for each patch to be applied to the patch filtering steps;

    sequentially selecting patch filter bands for each subswath that pass corresponding column data;

    frequency shifting the data passed through each of said patch filter bands for each subswath to a selected center frequency;

    interpolator filtering for passing at said selected center frequency, the sequences of data passed through said patch filter bands in a time sequence corresponding to the positions of said columns; and

    ,processing the sequences of data that are interpolator filtered for forming pixel display data in a time sequence corresponding to the positions of said columns.

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