According to the principles and signal properties of flutter test, a new filtering algorithm in time-frequency domain is presented.

根据颤振试验的原理和观测信号特点，提出一种时频域滤波方法。

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It presents a new method of DOA estimation in time-frequency domain, via establishing the STFD matrix and combining the traditional methods of array.

通过构建空间时频分布矩阵，和传统的阵列信号处理方法相结合，从而得到一种新的时频域的波达方向估计方法。

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The linear and quantitative nondestructive test of the grain defect is realized by using time-frequency domain character of the ultrasonic defect signal.

利用超声缺陷信号的时频域特征，较好地实现了该类型药柱的线性定量无损检测。

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