一种双调制率调频引信抗DRFM干扰方法

Anti-DRFM Jamming Method Using Dual Modulation Frequency for Frequency Modulated Fuze

现代战场电磁环境日趋复杂,数字射频存储(DRFM)干扰对调频引信的战场生存能力构成了严重威胁。在分析DRFM干扰下调频引信失效机理的基础上,设计了以双调制频率随机跳变的三角波线性调频信号作为发射波形的调频引信抗DRFM干扰方法。理论分析了目标回波与DRFM干扰下中频输出信号特征差异,设计了基于快速傅里叶变换(FFT)的谐波时序检测算法判别目标,并完成了硬件实现。半实物仿真结果表明,该方法可以在精确定距的同时,提高调频引信抗DRFM干扰性能。

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)fuze.Based on the failure mechanism analysis of FMCW fuze under DRFM jamming,an anti-DRFM jamming general scheme using triangular wave linear frequency modulated transmission waveform with random hopping dual modulation frequency is designed.The characteristic differences of beat signals between the action of target echo signals and DRFM jamming are analyzed.A harmonic wave timing detection algorithm based on fast Fourier transform (FFT)is designed for target recognition which is implemented with hardware experiments.The semi-physical simulation results show that the method can achieve accurate ranging and improve the anti-DRFM jamming performance for FMCW fuze.