PRPPM-PRBC复合引信抗线性调频干扰性能分析

Performance Research of Anti-LFM Jamming of PRPPM-PRBC Compound Fuze

伪码调相引信抗干扰能力较弱,PRPPM-PRBC复合引信是伪码复合体制引信发展的一个重要方向,有必要对该体制引信进行研究。推导了系统输入信干比和输出信干比,仿真计算了线性调频干扰对相关性的影响。频带完全覆盖时,PRPPM-PRBC复合引信对线性调频干扰的信干比增益略大于1。当干扰方采用压制性瞄准式线性调频干扰,只要JSR大于5dB,系统相关接收的归一化输出峰值将低于0.5。在JSR一定的情况下,系统相关输出峰值与干扰和信号的频带重叠比例成反比。研究表明,对于瞄准式线性调频干扰,PRPPM-PRBC复合引信必须具备相应的抗干扰措施。

The pseudo-random code phase modulation fuze has inferior antijanning performance, and pseudo random pulse modulation and pseudo random coded phase-modulation compound fuze is one of the most important developing aspects in the future, so it is necessary to study this compound fuse. Input and output SJR was deduced, and the effect of LFM disturbance to correlating result was calculated and simulated. When the band of LFM jamming signal and PRPPM - PRBC overlaps, the signal to jamming ratio of PRPPM- PRBC compound fuze is only a little bigger than one. If the disturbance side chooses the oppressive aiming LFM jamming mode, the unitary peak value of correlator would descend down to 0.5 so long as the JSR exceeds 5dB. And the correlating result is opposite to the overlapping rate of frequency band between the jamming signal and actual reflecting wave. Studies show that the PRPPM-PRBC compound fuze must offer relating antijamming method while facing oppressive aiming LFM disturbance.