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Proceedings Paper

Spatially variant incoherence trimming for improved SAR CCD
Author(s): Daniel B. André; David Blacknell; Keith Morrison
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Paper Abstract

Conventional synthetic aperture radar (SAR) Coherent Change Detection (CCD) has been found to be of great utility in detecting changes that occur on the ground. The CCD procedure involves performing repeat pass radar collections to form a coherence product, where ground disturbances can induce detectable incoherence. However there is always a difference in the radar collection geometry which can lead to incoherent energy noise entering the CCD. When sensing flat terrain in a far-field regime, the incoherence due to collection geometry difference can be removed through a conventional global Fourier image support trimming process. However, it has been found that when the terrain is either in a near-field regime or 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. The new algorithm removes incoherent energy from the SAR CCD collection pair on a per-pixel basis according to the local radar geometry and topography, leaving a higher coherence CCD product. In order to validate the approach, change detection measurements were conducted with GB-SAR, a ground-based indoor radar measurement facility.

Paper Details

Date Published: 23 May 2013
PDF: 12 pages
Proc. SPIE 8746, Algorithms for Synthetic Aperture Radar Imagery XX, 87460K (23 May 2013); doi: 10.1117/12.2015377
Show Author Affiliations
Daniel B. André, Defence Science and Technology Lab. (United Kingdom)
David Blacknell, Defence Science and Technology Lab. (United Kingdom)
Keith Morrison, Cranfield Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 8746:
Algorithms for Synthetic Aperture Radar Imagery XX
Edmund Zelnio; Frederick D. Garber, Editor(s)

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