Radar Anti-jamming Technology based on Waveform Watermarking

摘要

Concerning the difficulty in guarantee the ability of the radar in the complex antagonism environment without prior information and the radar itself passively against the interference of the receiver after the jamming signal enters the radar receiver. An interference suppression approach based on waveform watermarking technology is presented(A method of interference suppression based on waveform watermarking technology is proposed.). First of all, the influence of modulation parameters on the time domain waveform and spectrum of MPPSK signal is analyzed, then a radar waveform watermarking technique using MPPSK modulated waveform as medium frequency carrier is presented. On this basis, the interference suppression method based on two pulse cancellation is proposed, and the effect of inhibiting performance to SNR(Signal to Noise Ratio) and modulation parameters are analyzed by computer simulation. The simulation results show that using the ultra narrow band spectrum characteristics of 2PPSK, it can be embedded as a watermark to transmitted radar signals. The method has good anti-jamming effect at SNR ≥10dE, and can achieve the extraction of target distance information, but it needs accurate phase compensation between adjacent pulses.