本文提出了一种利用高阶谱相位数据进行时延估计的新方法。
The method of phase data time delay estimation based on high order spectrum is put forward.
研究了基于高阶谱（主要是三阶谱）和主元分析的故障特征提取方法。
The extracting fault features approach based on high-order spectral for pump valves of reciprocating pump was investigated, especially third order spectral analysis.
高阶谱所具有的特殊性质，有助于人们从新的角度对雷达回波进行分析。
Having the special property, higher spectrum is very useful for us to analyse radar echoes from a new view.
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