Overcoming spatial denial in non-cooperative bistatic radar

Several methods have recently been developed to prevent a radar from being used by a non-cooperative bistatic radar receiver as an illuminator. The main requirement for non-cooperative bistatic operation is the estimation of a coherent reference signal which is typically obtained by interception of the direct path signal via the sidelobes of the illuminator. These techniques are based on the idea of radiating a masking signal orthogonal to the radar signal, with sufficient power to mask the radar signal to a bistatic receiver. In this paper we show that signal diversity is an insufficient technique for non-cooperative bistatic denial by presenting a method for overcoming such denial techniques using a blind signal separation method. We also provide an estimator for the velocity of the target in bistatic denial conditions as well as performance analysis and simulation results.