Interference suppression using joint spatio-temporal domain filtering in passive radar

This paper addresses the problem of interference cancellation in passive bistatic radar. The impact of fractional time delay, channel linearity and reference channel signal-to-noise-ratio (SNR) on the interference cancellation performance is analyzed, and the results show that the performance of adaptive cancellation algorithm is degraded by the fractional time delay, the difference between the frequency responses of the surveillance channel and the reference channel, and a low reference channel SNR. To solve this problem, a signal reconstruction method is adopted to improve the reference signal quality, and a joint spa-tiotemporal domain interference suppression method is proposed to effectively mitigate direct-path interference and multi-path interference resulting in significant target SNR improvement The effectiveness of the proposed methods is verified by real data experiments.