针对伪码引信的瞄准式噪声调频干扰机理及硬件实现

Spot and Noise FM Jamming of Pseudo-Random Code Phase-Modulation Fuze and Hardware Implemented Circuit

首先从理论上分析了瞄准式噪声调频干扰对伪码调相引信相关检测的影响，分析表明当噪声调频干扰超出伪码调相引信自身抗干扰容限时，相关输出严重恶化，引信不能正常工作。基于此提出了一种瞄准式噪声调频干扰方案。该方案中，干扰机先搜索、接收伪码引信信号，提取伪码引信信号的载波频率，并把它存储下来，在引信工作频率上进行噪声调频干扰，使引信早炸或使引信失去识别目标信号的能力。给出了该方案的主要电路的工作原理和硬件实现，主要包括载波提取电路、低频噪声源的产生和锁相环噪声调频电路。从实验结果来看，系统设计原理正确，干扰方案有效可行。

The effect of spot and noise FM jamming on correlation detection of pseudo-random code phase-modulation fuze was analyzed theoretically in the paper. It is indicated that the correlation output is deteriorated when the jamming power is higher than the anti-jamming limit of the fuze system. The fuze works abnormally. The scheme of spot and noise FM jammer was put forward in the paper based on it. The jammer received the radiant signal from the fuze, captured and stored the carder frequency of the fuze, then transmitted noise FM jamming signal at the working frequency of the fuze. The fuze was detonated ahead or lost the capability of target recognition. The working principles and hardware implementation of key circuits of the scheme were given in the paper, which included the circuit of carrier extract, the generation of low frequency noise and the circuit of noise FM with PLL. The testing results show that the system design principle is correct and its scheme is effective and feasible.