高速运动目标多普勒有效信号自动提取方法

A method of automatic extraction of doppler effective signal of high-speed moving target

雷达多普勒信号的有效提取是膛内多普勒信号处理的关键环节,目前在内弹道工程应用中,常采用手动截取,这种方法的操作繁琐、误差较大、精度较低。针对上述问题,提出了一种雷达多普勒信号的自动提取方法。首先观察采集到的信号,截取明显的有用信号部分,对信号进行去噪,然后根据短时傅里叶变换(STFT)时频分析方法进行,选取合适的窗进行初步截取,最大速度点即为有效信号的终点,再根据高阶统计量方法,求出信号的起点,对信号进行提取。

Effective extraction of Doppler radar signal is the key to bore Doppler signal processing, it often uses manual interception wi thin the current trajectory engineering applica tions,which has a large error of this method,a complicated operation and low precis io n. To solve these pro blem s,the automatic extraction method is proposed for Doppler radar signal. First, it observes collected signal, intercepts usefull part of the signal and de-nose the signal. Then it uses STFT method based on the frequency analysis,selects the appropriate window to get the interception point of the maximum speed,which is the end of a val id signal. Last,according to higher-order statistics method,it can get the starting signal obtained of the signal extract ion.