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FFT-based displaced phase center array/along-track interferometry architecture

  • US 10,459,061 B2
  • Filed: 05/07/2015
  • Issued: 10/29/2019
  • Est. Priority Date: 05/08/2014
  • Status: Active Grant
First Claim
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1. A method for detecting the motion of a moving target, with a radar system including an antenna and a computing device including a nontransitory storage medium, comprising:

  • receiving a first set of inputs from the antenna;

    receiving a second set of inputs from the antenna, wherein the second set of inputs are substantially sequentially spatially aligned with the first set of inputs;

    forming a first SAR image, at the computing device, from the first set of inputs, the first SAR image having at least a first pixel comprising a first value;

    forming a second SAR image, at the computing device, from the second set of inputs, the second SAR image having at least a second pixel comprising a second value, the second SAR image having been formed after the first SAR image;

    inputting the first value and second value to a clutter cancelation processing module, programmatically defined by the computing device, and receiving from the clutter cancelation processing a first clutter canceled pixel value and a second clutter canceled pixel value;

    inputting the first clutter canceled pixel value and the second clutter canceled pixel value into an DFT processing module programmatically defined by the computing device; and

    receiving from the DFT processing module a first DFT output comprising a plurality of Doppler bins;

    comparing a first value of at least one Doppler bin from the first plurality of Doppler bins to a predetermined value to determine whether the first value of the at least one Doppler bin from the first plurality of Doppler bins is representative of a moving target;

    receiving from the DFT processing module a second DFT output comprising a second plurality of Doppler bins;

    comparing a second value of at least one Doppler bin of the second plurality of Doppler bins to a predetermined lookup table, the lookup table associating a plurality of Doppler bins values with a plurality of range-rate values, to correlate the second value to at least one of the range-rate values within the lookup table.

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