Research On Anti-DRFM Jamming For FMCW Radio Fuze Based On Waveform Hybrid Modulation

The electromagnetic environment on modern battlefield is becoming more and more complicated.Digital radio frequency memory(DRFM)jamming poses a serious threat to the survivability of frequency modulated continuous wave(FMCW)radio fuze.This paper studies the anti-DRFM jamming method for FMCW radio fuze from the perspective of transmission waveform aperiodic modulation.Research in this paper has important theoretical significance and military application value for FMCW radio fuze to improve anti-jamming performance and battlefield survivability.Firstly,this paper analyzes the failure machenism of FMCW radio fuze under DRFM jamming.Based on the anti-jamming research perspective of aperiodic modulation,an anti-DRFM jamming general scheme using triangular wave linear frequency modulated transmission waveform with random hopping dual modulation frequency is designed.The mathematical expressions of transmitting signal are derived and the transmission waveform parameters designed are optimized.The characteristic differences of beat signal between the action of target echo signal and DRFM jamming are analyzed.A signal processing method combined with dual channel harmonic wave rangding and timing detection based on FFT is designed,by analyzing the deficiency of the traditional harmonic detection method based on filter design.Secondly,the FMCW radio fuze system model is built based on Simulink,and the ranging and anti-jamming performance of the fuze system is analyzed.Simulation results show that the FMCW radio fuze design using triangular wave modulated transmission waveform with random hopping dual modulation frequency has good ranging performance,which can also improve its anti-DRFM jamming ability.The hardware circuit design and Verilog programming of the signal processing system are completed based on simulation results.The effectiveness of the signal processing method is verified by Modelsim function simulation rusults.Finally,the ranging and anti-jamming performance of the singal processing system is tested under the actions of simulated target echo and DRFM jamming signal respectively.The simulation coincides with the test results,which show that the general scheme of anti-DRFM jamming and the signal processing hardware system designed in this paper can achieve accurate ranging and anti-jamming performance.