基于极性变换的伪码引信宽带干扰抑制技术

The Oppressive Broadband Interference Excision Technique Based on Polar Transformation for Pseudo Noise Phase Modulation Fuze System

提出了一种基于极性变换的干扰抑制新技术,接收信号首先经过极性变换分别得到幅度序列和相位序列,其中幅度序列在变换域通过门限滤波去除有用信号和白噪声成分,相位序列和滤波后的幅度序列通过极性反变换重构出干扰信号,最后将从接收信号中将重构出的干扰信号减去,即得到所需信号。通过仿真分析发现该方法能较好地抑制干扰,尤其是强干扰,相关输出得到明显改善。

A new simple technique of excising interference based on Polar transformation is put forward.The received signal is first polar transformed to magnitude and phase sequences.The magnitude sequence is then discrete fourier transformed to frequency domain.A notch filter to excise the useful signal in transform domain is set up.The magni- tude sequence is directed to notch filter and the magnitude sequence of the interference is got.At last the interference is reconstructed using notched magnitude sequence and the phase sequence by taking inverse polar transformation.Then the reconstructed interference is subtracted from the received signal.It is found by simulation that the technique pro- posed in this paper can effectively excise the broadband interference,especially for strong interference.And the correla- tion output is improved obviously.