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Bistatic experiment with ultra-wideband VHF-band synthetic- aperture radar


Ulander, L; Flood, B; Frölind, P-O; Gustavsson, A; Jonsson, T; Rasmusson, J; Stenström, G; Barmettler, A; Meier, E (2008). Bistatic experiment with ultra-wideband VHF-band synthetic- aperture radar. In: Informationstechnische Gesellschaft im VDE. EUSAR 2008. Berlin: VDE Verlag, 131-134.

Abstract

We describe a bistatic ultra-wideband VHF-band SAR experiment and present measurement results. The bistatic SAR system, operating in the band 28-73 MHz, is based on CARABAS-II as airborne transmitter and LORA as ground-based receiver. Monostatic SAR data can also be acquired simultaneously. In September 2007, a measurement campaign was conducted in Switzerland with the ground-based receiver located on Mount Niesen in Berner Oberland. The objective was to investigate the hypothesis that the bistatic signal-to-clutter ratio for a vehicle in a background of forested terrain or urban environment increases as the bistatic elevation angle increases. Both mono- and bistatic SAR images have been formed using backprojection techniques. Images with bistatic elevation angle of 4° (quasi-monostatic case) show similar characteristics as the monostatic images. The images with bistatic elevation angle of 10° and 20°, however, indicate that the clutter level decreases over both forested and urban areas. Measurements show that the signal-to-clutter ratio for a truck vehicle in a forest background increases by up to 10 dB compared with the quasi-monostatic case. The corresponding increase in signal-to-clutter ratio for an urban background is 2-8 dB, with the higher value obtained for multi-level buildings. These observations indicate that target detection can be significantly improved by using bistatic VHF-band SAR geometries.

We describe a bistatic ultra-wideband VHF-band SAR experiment and present measurement results. The bistatic SAR system, operating in the band 28-73 MHz, is based on CARABAS-II as airborne transmitter and LORA as ground-based receiver. Monostatic SAR data can also be acquired simultaneously. In September 2007, a measurement campaign was conducted in Switzerland with the ground-based receiver located on Mount Niesen in Berner Oberland. The objective was to investigate the hypothesis that the bistatic signal-to-clutter ratio for a vehicle in a background of forested terrain or urban environment increases as the bistatic elevation angle increases. Both mono- and bistatic SAR images have been formed using backprojection techniques. Images with bistatic elevation angle of 4° (quasi-monostatic case) show similar characteristics as the monostatic images. The images with bistatic elevation angle of 10° and 20°, however, indicate that the clutter level decreases over both forested and urban areas. Measurements show that the signal-to-clutter ratio for a truck vehicle in a forest background increases by up to 10 dB compared with the quasi-monostatic case. The corresponding increase in signal-to-clutter ratio for an urban background is 2-8 dB, with the higher value obtained for multi-level buildings. These observations indicate that target detection can be significantly improved by using bistatic VHF-band SAR geometries.

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Contributors:Informationstechnische Gesellschaft im VDE (ITG), Deutsche Forschungsanstalt für Luft- und Raumfahrt (DLR), European Aeronautic Defense and Space Company (EADS), Forschungsgesellschaft für Angewandte Naturwissenschaften (FGAN)
Item Type:Book Section, not refereed, original work
Communities & Collections:07 Faculty of Science > Institute of Geography
Dewey Decimal Classification:910 Geography & travel
Language:English
Date:2008
Deposited On:21 Jan 2009 16:51
Last Modified:05 Apr 2016 12:50
Publisher:VDE Verlag
ISBN:978-3-8007-3084-1
Additional Information:7th European Conference on Synthetic Aperture Radar, June 2-5 2008, Friedrichshafen
Official URL:http://www.vde-verlag.de/data/prcd.php?docid=453084031&loc=de
Related URLs:http://www.vde-verlag.de/data/buecher.php?action=bookdetail&vertriebsnr=453084&rubrik=Proceedings&sort=ERSCHJAHR&direction=DESC&pg=1
Permanent URL: https://doi.org/10.5167/uzh-10583

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