FFT-based displaced phase center array/along-track interferometry architecture
First Claim
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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Abstract
A radar architecture comprising a computing device having a DC subtraction module, programmed to average a first value of a first pixel from a first received SAR image and a second value of a second pixel from a second received SAR image, to produce an averaged value, and to subtract the averaged value from the first value, resulting in a first DC subtracted pixel value, and to subtract the averaged value from the second value, resulting in a second DC subtracted pixel value; a DFT processing module programmed to receive the first DC subtracted pixel value and the second DC subtracted pixel value and to output a first DFT output comprising a plurality Doppler bins; and a detector module programmed to determine if the output of the DFT represents the presence of a target, and to estimate range-rate via a lookup table.
17 Citations
18 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A radar system for detecting the motion of a moving target, comprising:
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a computing device having a nontransitory storage medium comprising; a clutter cancelation processing module, programmed to receive a first value of a first pixel from a first SAR image, and a second value of a second pixel from a second SAR image, the second SAR image being spatially aligned with the first SAR image, the second SAR image having been formed after the first SAR image, and to output a first clutter canceled pixel value and a second clutter canceled pixel value; a DFT processing module programmed to receive the first clutter canceled pixel value and the second clutter canceled pixel value and to output a first DFT output comprising a plurality Doppler bins; and a detector module programmed to compare 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, wherein the detector module is further programmed to receive from the DFT processing module a second DFT output comprising a second plurality of Doppler bins, and to compare 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. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification