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Airborne SAR on circular trajectories to reduce layover and shadow effects of urban scenes

: Palm, S.; Sommer, R.; Pohl, N.; Stilla, U.


Erbertseder, T. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Remote Sensing Technologies and Applications in Urban Environments : 26-27 September 2016, Edinburgh, United Kingdom
Bellingham, WA: SPIE, 2016 (Proceedings of SPIE 10008)
ISBN: 978-1-5106-0420-9
ISBN: 978-1-5106-0421-6
Paper 100080N, 8 S.
Conference "Remote Sensing Technologies and Applications in Urban Environments" <2016, Edinburgh>
Fraunhofer FHR ()

Circular synthetic aperture radar (CSAR) can provide a full aspect coverage on interesting scenes in one run. Over the city of Karlsruhe a Ka-band dataset was generated in CSAR mode. The data was focused using subapertures in a step of 1.5°, each SAR image representing the scene from a slightly different aspect. The potential of non-coherent fusion of full aspect coverage to reveal small targets was demonstrated. By a manual selection of the viewing angle, parking cars next to high buildings could be revealed and a full view on selected targets with reduced shadow and overlay effects was shown. We studied the effect of varying aspects on the focused image pixels and developed a first metric to automatically select the best viewing angle to a local scene. Areas containing ground information like grass or asphalt and which are not hidden between high objects could be identified and used to deliver a good aspect view on neighboring areas which suffer from shadowing effects.