CLEAN algorithm based direct-path-interference and multi-path-interference suppression in Bistatic MIMO Radar

Transceiver arrays of Bistatic MIMO Radar are separated in airspace, which transmit orthogonal signals in space, forming a wide, low-gain transmit beam. With the DBF technique, the receiver can form multiple integrated transmit and receive beams. As multiple orthogonal signals are transmitted, direct-path interference and multi-path interference are combination of multiple signals, and meanwhile, considering the correlativity of target signal and interference, the methods such as transmit nulling, sidelobe cancellation and subspace-projection are inapplicable. The method of CLEAN algorithm based direct-path interference and multi-path interference suppression is proposed in this paper with the characters of this radar and the lack of existing methods considered. This method suppresses the direct-path and multi-path interference, highlighting the weak target signal by stripping strong interference signals layer by layer. Simulation results prove the validity of the method.