Communications: directive radio wave systems and devices (e.g. – Synthetic aperture radar
Patent
1996-05-31
1997-08-19
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
Synthetic aperture radar
342156, 342196, G01S 1390
Patent
active
056593180
ABSTRACT:
An interferometric Synthetic Aperture Radar (SAR) system having a special-purpose processor to integrate motion compensation, interferogram coregistration, and a spectral shifting for optimal interferogram correlation together to achieve efficient, accurate, and robust three-dimensional imaging. A simple radar mapping coordinate system is implemented in the present invention to enhance the overall image processing and in particular to improve the accuracy and efficiency. The present invention substantially improves the fidelity and efficiency of phase unwrapping by incorporating phase-bootstrapping process, a correlation filter, and other processes. Absolute phase determination is implemented without known ground references by two proposed techniques employing cross-correlation of sub-patches to generate a number of estimates within a patch and weighting correlation processes.
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S.N. Madsen, On absolute phase determination techniques in SAR interferometry, SPIE conf. on Radar Sensor Technology, 2487:393, Apr. 19-21, 1995.
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Madsen, et al., Automated Absolute Phase Retrieval in Across-track Interferometry, Proc. of the International Geoscience and Remote Sensing Symposium, IGARSS'92, 2:1582, May 26-29, 1992.
Hensley Scott
Imel David A.
Kim Yunjin
Madsen Soren N.
Martin Jan M.
California Institute of Technology
Sotomayor John B.
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