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Abstract—A bistatic synthetic aperture radar uses a separated
transmitter and receiver flying on different platforms to achieve
benefits like exploitation of additional information contained
in the bistatic reflectivity of targets, reduced vulnerability for
military applications, forward looking SAR imaging or increased
RCS. A particular constellation, where the transmitter is in space
and the receiver near or on the earth surface (e.g. aircraft,
tower) is called a hybrid bistatic SAR system. Besides technical
challenges, like the synchronization of transmitter and receiver,
the overlap of the two antenna footprints is of vital importance.
Due to the extreme platform velocity differences, SAR modes with
flexible steering of the antenna beams are necessary. The sliding
spotlight mode offers such a beam steering, where the antenna
footprint velocity can be chosen slower or faster than the platform
velocity. If both tra

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