结果表明：该方法提取的缺陷回波信号特征值，其可分性测度均值达91.7%，从而证明该方法对超声检测缺陷回波信号的特征提取是相当有效的。
The average value of separability measure is as high as 91.7%, which indicates that this method is quite effective in the feature extraction of ultrasonic flaw echoes.
研究了一种基于非相参雷达目标回波的特征提取算法。
The method of radar target waveform feature extraction is studied based on non coherent radar target echo.
在阵列信号处理中，提取回波信号中的空间频率，可以得到目标的方位信息。
In processing of array signal, Direction of Arrival (DOA) of target can be obtained by extracting spatial frequency of echo.
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