A reference signal extraction technique of passive radar

A technique of reference signal extraction of passive radar from multipath interference is proposed, which is based on the second-order statistics of the signal utilized. The interference model of reference channel and the cyclostationarity of oversampled signal are analyzed. Also the signal processing and algorithm parameter selection are addressed. Simulation results indicate that the method needs neither priori knowledge of channel nor the synchronization of time and frequency and performs well with a few data samples.