Bistatic 3D Subsurface Radar Imaging

Conference: EUSAR 2008 - 7th European Conference on Synthetic Aperture Radar
06/02/2008 - 06/05/2008 at Friedrichshafen, Germany

Proceedings: EUSAR 2008

Pages: 4Language: englishTyp: PDF

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Hayashi, Naoki (Graduate School of Environmental Studies, Tohoku University, Sendai, Japan)
Sato, Motoyuki (Center for Northeast Asian Studies, Tohoku University, Sendai, Japan)

Two design methods of a filter in frequency-spatial frequency domain (f-k filter) have been developed for bistatic radar to suppress direct wave which causes significant artifacts in a radar image. One method is to reject a region in f-k domain, where the region is determined from a position information of a transmitter and a receiver. The other method uses time shift to eliminate a difference of arrival time of the direct wave. Then, f-k spectrum of the direct wave concentrates around frequency axis, and filter to reject DC component in spatial direction is designed. Both methods are verified with a laboratory measurement. They can suppress strong artifacts caused by the direct wave clearly, and give more reliable image to detect a buried object.