System and method for synthetic aperture radar image formation
First Claim
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1. A method for generating a synthetic aperture radar image of a ground region, the method comprising:
- performing a coarse image formation operation on a plurality of sub-band sub-dwell arrays to form a plurality of two dimensional coarse image arrays;
performing a pixel interpolation operation on each of the plurality of coarse image arrays to form a corresponding plurality of two dimensional first interpolated image arrays, each of the first interpolated image arrays being larger, in each of the two dimensions, than the corresponding coarse image array;
performing a first coherent subimage formation operation on the plurality of first interpolated image arrays to form a plurality of first summed images;
performing a pixel interpolation operation on the plurality of first summed images to form a corresponding plurality of two dimensional second interpolated image arrays, each of the second interpolated image arrays being larger, in each of the two dimensions, than the corresponding first summed image; and
performing a second coherent subimage formation operation on the plurality of second interpolated image arrays to form a plurality of second summed images,wherein each of the two dimensional coarse image arrays is a coarse ground plane image of the ground region,wherein each of the first interpolated image arrays is a ground plane image of the ground region,wherein each of the second interpolated image arrays is a ground plane image of the ground region, andwherein the performing a pixel interpolation operation on a first coarse image array of the plurality of coarse image arrays to form the corresponding first interpolated image array comprises forming a pixel of the corresponding first interpolated image array as a weighted sum of pixels of a contiguous subarray of the first coarse image array.
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Abstract
A system and method for forming synthetic aperture radar images. Radar return pulses are grouped into sub-dwells, and their frequency content is separated into frequency sub-bands. A coarse image is formed for each sub-band/sub-dwell combination. The coarse images are iteratively interpolated to higher resolution and combined, to form a single high-resolution synthetic aperture radar image.
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Citations
16 Claims
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1. A method for generating a synthetic aperture radar image of a ground region, the method comprising:
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performing a coarse image formation operation on a plurality of sub-band sub-dwell arrays to form a plurality of two dimensional coarse image arrays; performing a pixel interpolation operation on each of the plurality of coarse image arrays to form a corresponding plurality of two dimensional first interpolated image arrays, each of the first interpolated image arrays being larger, in each of the two dimensions, than the corresponding coarse image array; performing a first coherent subimage formation operation on the plurality of first interpolated image arrays to form a plurality of first summed images; performing a pixel interpolation operation on the plurality of first summed images to form a corresponding plurality of two dimensional second interpolated image arrays, each of the second interpolated image arrays being larger, in each of the two dimensions, than the corresponding first summed image; and performing a second coherent subimage formation operation on the plurality of second interpolated image arrays to form a plurality of second summed images, wherein each of the two dimensional coarse image arrays is a coarse ground plane image of the ground region, wherein each of the first interpolated image arrays is a ground plane image of the ground region, wherein each of the second interpolated image arrays is a ground plane image of the ground region, and wherein the performing a pixel interpolation operation on a first coarse image array of the plurality of coarse image arrays to form the corresponding first interpolated image array comprises forming a pixel of the corresponding first interpolated image array as a weighted sum of pixels of a contiguous subarray of the first coarse image array. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for generating a synthetic aperture radar image of a ground region, the system comprising a receiver comprising a processing circuit, the processing circuit being configured to:
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perform a coarse image formation operation on a plurality of sub-band sub-dwell arrays to form a plurality of two dimensional coarse image arrays; perform a pixel interpolation operation on each of the plurality of coarse image arrays to form a corresponding plurality of two dimensional first interpolated image arrays, each of the first interpolated image arrays being larger, in each of the two dimensions, than the corresponding coarse image array; perform a first coherent subimage formation operation on the plurality of first interpolated image arrays to form a plurality of first summed images; perform a pixel interpolation operation on the plurality of first summed images to form a corresponding plurality of two dimensional second interpolated image arrays, each of the second interpolated image arrays being larder, in each of the two dimensions, than the corresponding first summed image; and perform a second coherent subimage formation operation on the plurality of second interpolated image arrays to form a plurality of second summed images, wherein each of the two dimensional coarse image arrays is a coarse ground plane image of the ground region, wherein each of the first interpolated image arrays is a ground plane image of the ground region, wherein each of the second interpolated image arrays is a ground plane image of the ground region, and wherein the performing a pixel interpolation operation on a first coarse image array of the plurality of coarse image arrays to form the corresponding first interpolated image array comprises forming a pixel of the corresponding first interpolated image array as a weighted sum of pixels of a contiguous subarray of the first coarse image array. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification