Reduced Rank Interference Suppression for Multichannel SAR

Conference: EUSAR 2006 - 6th European Conference on Synthetic Aperture Radar
05/16/2006 - 05/18/2006 at Dresden, Germany

Proceedings: EUSAR 2006

Pages: 4Language: englishTyp: PDF

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Rosenberg, Luke; Gray, Doug (University of Adelaide, Australia)
Rosenberg, Luke (Defence Science and Technology Organisation, Australia)

Large regions of a Synthetic Aperture Radar (SAR) image can potentially be destroyed by an airborne broadband jammer. Jammer components include both the direct-path and multipath reflections from the ground, known as hot-clutter (HC) or terrain scattered interference. Using multiple antennas on a SAR provides spatial degrees of freedom and allows for beamforming to reject the direct-path signal. Previous studies have shown that derivative constraints when combined with fast-time taps can suppress HC while maintaining a reasonable SAR image. This approach however requires an expensive matrix inverse and may not be implementable in real time. This paper therefore presents a fast-time Space Time Adaptive Processing (STAP) algorithm with a reduced rank constrained Generalised Sidelobe Canceller (GSC).