时频分析方法分为线性、二次型和自适应等多种方法，它们提供了在时频二维平面上，分析信号时变功率谱的有效手段。
The methods of time frequency analysis include linear, quadratic and adaptive methods. They provide effective tools for analyzing signal time varying spectrum in time frequency plane.
方法14名受试者分别参加肱二头肌和腰部脊竖肌等长运动负荷实验，取表面肌电信号进行FF T功率谱及其功率谱二维地形图分析。
Methods Static isometric loading of the biceps and low back muscle was performed in 14 subjects, using FFT power spectrum and its two dimensional mapping to analyze SEMG signals from these muscles.
本文在分析SAR相干干扰原理、用于SAR相干干扰信号产生的二维卷积算法的基础上，提出了一种快速算法。
This thesis has analyzed SAR coherent jamming theory, 2-d convolution algorithm for SAR coherent jamming signal generation, and provided a fast algorithm.
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