Bistatic SAR coherence over non-planar topographies

Daniel B. Andre; Keith Morrison

doi:10.1117/12.919440

7 May 2012 Bistatic SAR coherence over non-planar topographies

Daniel B. Andre, Keith Morrison

Proceedings Volume 8394, Algorithms for Synthetic Aperture Radar Imagery XIX; 83940C (2012) https://doi.org/10.1117/12.919440
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

Monostatic Synthetic Aperture Radar (SAR) Coherent Change Detection (CCD) has been found to be of great utility in detecting changes that occur on the ground. Detectable changes of interest include vehicle tracks and water flow. The CCD procedure involves performing repeat pass radar collections, to form a coherence product, where ground disturbances can induce detectable incoherence. However there is usually a difference in the radar collection geometry which can lead to incoherent energy noise entering the CCD, which reduces the detectability of tracks. When sensing flat terrain, the incoherence due to collection geometry difference can be removed through a conventional Fourier image support trimming process. However, it has been found that when the terrain contains non-flat topography, the optimal trimming process is substantially more involved, so much so that a new per-pixel SAR back-projection imaging algorithm has been developed. This algorithm trims off incoherent energy on a per-pixel basis according to the local topography. In order to validate the bistatic SAR generalization to the monostatic per-pixel formalism and algorithm, bistatic change detection measurements were conducted with the GB-SAR system, and these are reported here.

Citation Download Citation

Daniel B. Andre and Keith Morrison "Bistatic SAR coherence over non-planar topographies", Proc. SPIE 8394, Algorithms for Synthetic Aperture Radar Imagery XIX, 83940C (7 May 2012); https://doi.org/10.1117/12.919440

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