An Extended Chirp Scaling imaging algorithm for bistatic SAR with unparallel flight paths

Bistatic SAR uses separated transmitter and receiver flying on different platforms, and has the ability of the exploitation of additional information contained in the bistatic reflectivity of targets. Besides of technical problems-like the synchronization of the oscillators-the processing of bistatic raw data imaging is not well studied theoretically all the same, which is a major area in bistatic SAR. This paper firstly describes the imaging of bistatic SAR with special case of parallel flight paths of transmitter and receiver, and then provides an efficient extended chirp scaling (ECS) algorithm for arbitrary bistatic SAR configure, which is based on the bistatic-to-monostatic application (BTMA). The method described is a feasible solution for the image formation of bistatic SAR with arbitrary bistatic configure. The problem of Doppler ambiguity during the ECS processing is also discussed at last. This ECS imaging algorithm is verified with a simulation experiment.