基于平方变换原理的伪码引信中噪声调频干扰抑制方法

分析了噪声调频干扰对伪码引信相关输出的影响．分析发现当干扰强度超出伪码引信的抗干扰容限时．其相关输出严重恶化．因此必须对其进行抑制。考虑到噪声调频干扰和有用信号之间存在着强的时频耦合．文中采用两次平方变换方法以实现干扰和有用信号的频谱分离．然后通过传统滤波方法将有用信号提取出来。通过仿真分析发现该方法能有效消除干扰．相关输出得到显著改善．尤其是对强干扰．干扰抑制效果更佳。

The Method of Excising Noise Frequency Modulation Interference for Pseudo-random Coded Fuze Based on Square Transformation

The effect of noise frequency modulation interference on pseudo-random coded fuze system is analyzed. It is found that the correlation output is deteriorated when the interference power is larger than the anti-interference limit of the fuze system. It is very necessary to excise the above interference. Because there is strong time and frequency coupling between the interference and useful signal, so twice square transformation is put forward in this paper to separate the interference and useful signal in frequency domain. Then the useful signal is extracted through traditional filtering. It is found by simulation that this method can effectively excise noise frequency modulation interference and the correlation output is improved obviously, especially for the strong interference.