Direct Signal Interference Suppression in DVB-S Based on Passive Bistatic Radar

Passive bistatic radar (PBR) frequently experiences interference from direct signal waves when detecting maritime targets, which can completely mask target echoes, particularly for distant targets or weak targets with low radar cross-section (RCS). To mitigate this, the paper proposes a direct signal interference (DSI) suppression method. The approach involves dual-channel reception of digital video broadcast satellites (DVB-S) signals from the China Sat-9, followed by signal preprocessing. The reference and surveillance channel signals are then segmented. After segmentation, the signals undergo fast Fourier transformation (FFT), and an adaptive filtering clutter suppression method is applied at each frequency point. Finally, an inverse fast Fourier transform (IFFT) is performed on the suppressed signals to obtain the DSI-suppressed output. Compared to traditional clutter suppression techniques, this method is not only faster but also achieves more effective suppression. Simulation experiments involving both single and multiple targets validate the superiority of the proposed algorithm.