调频多普勒引信EMD数字包络检波算法

FM Doppler Fuze Digital Envelope Detection Algorithm Based on Empirical Mode Decomposition

针对传统的数字检波算法无法对调频多普勒引信系统中的谐波信号进行检波这一问题,对谐波信号进行特性分析,提出一种基于经验模式分解(EMD)的数字检波算法,通过获取信号的极值点信息并做最小二乘曲线拟合来实现数字检波。传统的数字检波算法适用于受到幅度调制的单频正弦波,而EMD数字包络检波算法对于待检波信号表达式没有严格要求,对调频多普勒引信系统中谐波信号可以正常实现检波功能。

A digital detector algorithm based on Empirical Mode Decomposition(EMD)was proposed to solve the problem that the conventional digital detector algorithm cannot detect the harmonic signal in FM Doppler fuze system.This algorithm aimed to achieve digital detection by obtaining the extreme point information of the signals and performing least square curve fitting.The conventional digital detector algorithm was suitable for single frequency sine waves subject to amplitude modulation.,the improved algorithm had less strict requirements for the expression of signals to be detected,and could produce good detection results for harmonic signals in FM Doppler fuze systems.