In this case, time frequency analysis must be performed for every range cell to obtain range instantaneous Doppler (RID) image.

这时需要分距离单元进行时频分析，得到距离-瞬时多普勒图像。

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A new method, based on the analysis of frequency spectrum of instantaneous power, for the discrimination between internal fault currents and inrush currents in transformer is proposed.

在分析瞬时功率频谱特性的基础上，提出了一种基于瞬时功率的变压器励磁涌流和内部故障电流识别新方法。

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