Abstract: The failure mechanism of frequency modulation(FM) Doppler fuze under the frequency-shifting digital radio frequency memory (DRFM) jamming is analyzed, and an anti-jamming method of dual channel harmonic correlation detection based on the variable chirp rate transmitting signal is proposed to enhance the anti-jamming performance of FM fuze against the type of DRFM jamming. The chirp rate of the transmitting signal is changed alternately in the same period, the envelope peaks of two channel harmonic signals are extracted based on fast Fourier transform, and then put into an instantaneous correlation detection unit to get the ranging information and depress the jamming signal. The ranging and anti-jamming performances of the proposed method were verified through the hardware-in-the-loop simulation. The simulated results show that the proposed method has better anti-DRFM jamming performance and higher ranging resolution compared to the traditional FM Doppler fuze. Key

Key words: frequencymodulationfuze, anti-digitalradiofrequencymemoryjamming, variablechirprate, dual-channelharmonic, correlationdetection