LFM Interference Cancellation Algorithm Based on MDPT-WC for Mark XIIA Mode 5

Mark XIIA identification foe or friend (IFF) system is the main battle equipment that used by the U.S. and NATO forces. Mode 5 is the latest development mode of the system with a stronger anti-interference ability than the previous mode. However, it is still limited and difficult to transmit reliably in the interference environment of linear frequency modulation (LFM). Therefore, this paper proposes a LFM interference cancellation algorithm based on multiple discrete polynomial phase transform and weighted combination (MDPT-WC) for Mark XIIA Mode 5 system, which can reconstruct LFM interference and eliminate it effectively. The simulation results demonstrate that the LFM cancellation algorithm proposed in this paper can improve the transmission accuracy of Mode 5 system in a wide range of interference to signal ratio (ISR), so the proposed algorithm is valuable in application.