Method and system for providing along-track alignment and formatting of synthetic aperture radar (SAR) data, and SAR image formation algorithms using such method and system
First Claim
1. A method of generating a synthetic aperture radar (SAR) image from a SAR signal, the SAR signal being indicative of a scene having a multitude of point scatterers and distributed area scatterers, the method comprising:
- performing a first partial data stabilization to a point operation on the SAR signal to generate a partially stabilized SAR signal, the first partial data stabilization including removing a high bandwidth azimuth chip from the SAR signal;
performing an along-track migration operation on the partially stabilized SAR signal to migrate SAR signal support of the scatterer in the scene as a function of along-track location of the scatterer in order to generate an along-track aligned partially stabilized SAR signal;
performing a second partial data stabilization to a point operation on the along-track aligned partially stabilized SAR signal in order to complete the performance of the data stabilization to a point operation on the SAR signal and thereby generate an azimuth formatted SAR signal; and
processing the azimuth formatted SAR signal to generate the SAR image.
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Abstract
An along-track alignment and formatting system (ATAFS) formats synthetic aperture radar (SAR) data to align and format signals from scatterers in a scene to achieve an ideal data format in the along-track dimension in which such ideal data format leads to improved image quality of an image based on the SAR data and/or reduced computational burden for generating an image based on the SAR data. Two aspects of the ATAFS include: 1) the division of data stabilization into two distinct steps; and 2) the along-track (or slow-time) migration of signal support of scatterers as a function of their along-track location. A suite of SAR image formation algorithms use the ATAFS in conjunction with conventional signal processing stages to transform input coherent signal data into a complex image with image quality and geometric accuracy commensurate with the inherent information content of the input data.
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Citations
21 Claims
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1. A method of generating a synthetic aperture radar (SAR) image from a SAR signal, the SAR signal being indicative of a scene having a multitude of point scatterers and distributed area scatterers, the method comprising:
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performing a first partial data stabilization to a point operation on the SAR signal to generate a partially stabilized SAR signal, the first partial data stabilization including removing a high bandwidth azimuth chip from the SAR signal;
performing an along-track migration operation on the partially stabilized SAR signal to migrate SAR signal support of the scatterer in the scene as a function of along-track location of the scatterer in order to generate an along-track aligned partially stabilized SAR signal;
performing a second partial data stabilization to a point operation on the along-track aligned partially stabilized SAR signal in order to complete the performance of the data stabilization to a point operation on the SAR signal and thereby generate an azimuth formatted SAR signal; and
processing the azimuth formatted SAR signal to generate the SAR image. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A method of generating a synthetic aperture radar (SAR) image from a SAR signal, the method comprising:
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performing a first partial data stabilization to a point operation on the SAR signal to generate a partially stabilized SAR signal, the first partial data stabilization including removing a high bandwidth azimuth chirp from the SAR signal;
performing an along-track migration operation of the partially stabilized SAR signal to generate an along-track aligned partially stabilized SAR signal;
performing a second partial data stabilization to a point operation on the along-track aligned partially stabilized SAR signal in order to complete the performance of the data stabilization to a point operation on the SAR signal and thereby generate an azimuth formatted SAR signal; and
processing the azimuth formatted SAR signal to generate the SAR image.
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Specification