Bistatic Clutter Suppression in Low-frequency SAR

Konferenz: EUSAR 2006 - 6th European Conference on Synthetic Aperture Radar
16.05.2006 - 18.05.2006 in Dresden, Germany

Tagungsband: EUSAR 2006

Seiten: 4Sprache: EnglischTyp: PDF

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Ulander, Lars M. H.; Martin, Torleif (Swedish Defence Research Agency (FOI), Sweden)

This paper discusses the possibilities of suppressing clutter returns in low-frequency (VHF-band) SAR using bistatic radar geometries. It is noted that strong clutter returns in many low-frequency SAR scenes are caused by a dihedral-like scattering mechanism. For example, this is often the case in forest-covered terrain or urban scenes. The bistatic scattering lobes of such clutter returns are, however, rather narrow and the clutter may therefore be reduced by a sufficiently large separation in angle of the transmitter and receiver using a bistatic configuration. Target scattering, on the other hand, is less sensitive to bistatic angular separation. In the paper, we show results from electromagnetic simulations in the frequency band 20-90 MHz, which illustrate the principle and indicate a significant improvement of the target-to-clutter ratio.