Wideband and Wide Null Direct Path Interference Suppression Algorithm for Bistatic Detection and Its Embedded Implementation

Direct path interference (DPI) is inevitable in bistatic detection systems. To address existing limitations, this paper proposes a wideband and wide null DPI suppression algorithm from a spatial processing perspective by integrating null boarding techniques and subband decomposition, and implements real-time embedded processing. Simulation results show that this approach effectively suppresses wideband DPI while reducing the dead zone [1] area and enhancing target detection capability near the baseline. Furthermore, the algorithm outperforms conventional methods within certain signal-to-noise ratio (SNR) ranges and maintains deep null depths under achievable fabrication tolerance.