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.
Stephan Palm, Rainer Sommer, Nils Pohl, and Uwe Stilla, "Airborne SAR on circular trajectories to reduce layover and shadow effects of urban scenes," Proc. SPIE 10008, Remote Sensing Technologies and Applications in Urban Environments, 100080N (Presented at SPIE Remote Sensing: September 27, 2016; Published: 26 October 2016); https://doi.org/10.1117/12.2242269.
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