伪码调相脉冲引信抗线性调频干扰分析与仿真

Performance Analysis and Simulation of Anti-LFM Interference of Pseudo-random Code and Pulse-doppler Combined Fuze

在对伪码调相脉冲多普勒引信工作原理和抗干扰原理分析的基础上,对占空比为4%、码长为127的伪码调相脉冲多普勒引信在LFM干扰下的相关解调输出信号和伪码序列自相关函数进行了仿真,结果发现,当信干比(SJR)为-30 dB时,该引信仍能正常工作,并且当脉冲伪码序列自相关函数的旁瓣超过门限值时,并不能引起伪码调相脉冲多普勒引信的误启动。通过仿真分析。

The operation principle and anti -interference principle of pseudo -random code phase -modulation and pulse - doppler combined fuze are analyzed. On this basis, the output signal of correlation demodulation and the self - correlation function of pulse pseudo - random code train about the combined fuze are simulated under LFM interference. The combined fuzeg duty ratio is 4% and its code length is 127. The simulation results show that the fuze can still work when 30 dB signal -to -jamaing ration（SJR） is and when the side lobe of the correlation function of pulse pseudo - random code train is bigger than the fuze＇s threshold the fuze will not carry out falsely. Simulation and analysis shows the performance of anti - LFM interference of pseudo- random code phase -modulation and pulse -doppler combined fuze.