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雷达回波信号的有效提取是影响后续膛内多普勒信号处理的关键环节,目前内弹道工程应用中通常采用手动截取,该方法的误差较大、精度较低。针对上述问题,提出了一种雷达回波信号的自动提取方法。首先截掉明显的无用噪声部分,然后根据短时傅里叶变换(STFT)时频分析方法结合多普勒原理求出整段信号的速度,并判断出最大速度点作为有效信号的终点,利用改进的多时窗能量比法判定信号的起点。仿真信号及实际信号的实验结果表明,该方法对有效信号起点与终点提取的平均误差为0.1875 ms。
The effective extraction of radar echo signal is the key to the Doppler signal processing in the subsequent bore. Currently, manual interception is usually used in the application of the internal ballistic engineering. The error of this method is large and the accuracy is low. In view of the above problems, an automatic radar echo signal extraction method is proposed. First of all, the obvious part of unwanted noise is cut off, and then the velocity of the whole signal is obtained according to the STFT time-frequency analysis combined with the Doppler principle and the maximum velocity point is determined as the end point of the effective signal. Improved multi - window energy ratio method to determine the starting point of the signal. Experimental results of the simulated signal and the actual signal show that the average error of the method for extracting the start and end of the effective signal is 0.1875 ms.