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US 7,397,418 B1Granted
SAR image formation with azimuth interpolation after azimuth transform
AssigneeSandia Corporation
InventorsArmin W. Doerry, Grant D. Martin, Michael W. Holzrichter
Life of this patent
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Abstract
Two-dimensional SAR data can be processed into a rectangular grid format by subjecting the SAR data to a Fourier transform operation, and thereafter to a corresponding interpolation operation. Because the interpolation operation follows the Fourier transform operation, the interpolation operation can be simplified, and the effect of interpolation errors can be diminished. This provides for the possibility of both reducing the re-grid processing time, and improving the image quality.
Claims18
A synthetic aperture radar (SAR) method, comprising:
- receiving SAR data that has been collected to provide a two-dimensional representation of a target scene;
- processing the collected SAR data into a rectangular grid format for use in SAR image processing, including applying to the collected SAR data a Fourier transform operation with respect to a first direction to produce Fourier-transformed SAR data, and applying to the Fourier-transformed SAR data an interpolation operation with respect to said first direction to produce interpolated SAR data, wherein said first direction is defined by the rectangular grid;
- and,
- applying to said interpolated SAR data a Fourier transform operation with respect to a second direction defined by the rectangular grid.
1 more element
A SAR apparatus, comprising:
- an input for receiving SAR data that has been collected to provide a two-dimensional representation of a target scene;
- an apparatus coupled to said input for processing the collected SAR data into a rectangular grid format for use in SAR image processing, including a transform processing unit for applying to the collected SAR data a Fourier transform operation with respect to a first direction to produce Fourier-transformed SAR data, and an interpolation unit coupled to said transform processing unit for applying to the Fourier-transformed SAR data an interpolation operation with respect to said first direction to produce interpolated SAR data, wherein said first direction is defined by the rectangular grid;
- and,
- a further Fourier transform processing unit coupled to said interpolation unit for applying to said interpolated SAR data a Fourier transform operation with respect to a second direction defined by the rectangular grid.
1 more element
Dependencies are inferred from the claim text.