Three-channel processing for improved geo-location performance in SAR-based GMTI interferometry

Ross W. Deming; Scott MacIntosh; Matthew Best

doi:10.1117/12.917700

7 May 2012 Three-channel processing for improved geo-location performance in SAR-based GMTI interferometry

Ross W. Deming, Scott MacIntosh, Matthew Best

Proceedings Volume 8394, Algorithms for Synthetic Aperture Radar Imagery XIX; 83940F (2012) https://doi.org/10.1117/12.917700
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

This paper describes a method for accurately geo-locating moving targets using three-channel SAR-based GMTI interferometry. The main goals in GMTI processing are moving target detection and geo-location. In a 2011 SPIE paper we showed that reliable target detection is possible using two-channel interferometry, even in the presence of main-beam clutter. Unfortunately, accurate geo-location is problematic when using two-channel interferometry, since azimuth estimation is corrupted by interfering clutter. However, we show here that by performing three-channel processing in an appropriate sequence, clutter effects can be diminished and significant improvement can be obtained in geo-location accuracy. The method described here is similar to an existing technique known as Clutter Suppression Interferometry (CSI), although there are new aspects of our implementation. The main contribution of this paper is the mathematical discussion, which explains in a straightforward manner why three-channel CSI outperforms standard two-channel interferometry when target signatures are embedded in main-beam clutter. Also, to our knowledge this paper presents the first results of CSI applied to the Gotcha Challange data set, collected using an X-band circular SAR system in an urban environment.

Citation Download Citation

Ross W. Deming, Scott MacIntosh, and Matthew Best "Three-channel processing for improved geo-location performance in SAR-based GMTI interferometry", Proc. SPIE 8394, Algorithms for Synthetic Aperture Radar Imagery XIX, 83940F (7 May 2012); https://doi.org/10.1117/12.917700

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