基于时频分析的伪码调相引信自适应干扰对消器设计

The Design of Adaptive Interference Cancellation Unit of Pseudo-random Code Phase Modulation Fuze Based on Time-frequency Analysis

时频分析是识别宽带扩频信号中窄带干扰的有效方法。采用扩展离散Wigner-Ville分布(EDTWD)的时频分析方法提取和重构伪码调相引信回波信号中的窄带干扰,然后通过自适应干扰对消将干扰消除。该方法不需要干扰信号的先验知识,滤除干扰的同时使目标回波信号失真很小,也适用于存在多个干扰源的情况。介绍其算法原理和设计过程,并给出仿真结果。

Time-frequency analysis method is an effective method of identifying the narrow-band interference in the wide-band spread spectrum signal. A time-frequency analysis method of extended discrete-time Wigner-Ville distribution （EDTWD） was used to extract and reconstruct the narrow-band interference in the received signal of pseudo-random code phase modulation fuze in the thesis. Then the interference was cancelled by the adaptive interference cancellation. The method doesn＇ t require any prior knowledge of interference signal, makes the received signal distorted little and can also be used in the circumstance of some interference sources. The algorithm theory and design process of the method was proposed, and the simulation result was offered.