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APPARATUS AND METHOD FOR RADAR IMAGING BY MEASURING SPATIAL FREQUENCY COMPONENTS

  • US 20080291077A1
  • Filed: 05/16/2008
  • Published: 11/27/2008
  • Est. Priority Date: 05/21/2007
  • Status: Active Grant
First Claim
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1. A radar imaging system comprising:

  • a transmit antenna adapted to transmit radar waveforms to illuminate a target region extending in a range direction and in an azimuth direction;

    a receive antenna divided into a plurality of array segments, wherein the receive antenna is adapted to receive a radar return from the target region and to generate a plurality of return signals associated with corresponding ones of the plurality of array segments;

    a range processor adapted to receive the plurality of return signals from the receive antenna and to divide them into a plurality of range slices, wherein each one of the plurality of range slices comprises a plurality of azimuth signals associated with corresponding ones of the plurality of array segments;

    at least one modulation-transfer-function (MTF) processor adapted to receive the plurality of azimuth signals from one of the plurality of range slices at a time and to auto-correlate the plurality of azimuth signals to generate a plurality of spatial-frequency signals;

    at least one Fourier transform processor adapted to receive the plurality of spatial-frequency signals and to generate an inverse Fourier transform of the spatial-frequency signals to generate an azimuth image slice associated with the one of the plurality of range slices received by the at least one MTF processor; and

    an image processor adapted to combine azimuth images slices associated with ones of the plurality of range slices to create a two-dimensional radar image.

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