The method of analysis frequency table is using the meter of frequency table to test all kinds of frequency and then calculate the distortionof the wave.
频谱分析法是用频率分析仪测量各次谐波的方法计算出波形失真度，但采用此种方法的仪器价格较昂贵。
2
To verify the accuracy and efficiency of this method, the distortionof the wave propagation on two typical mild slopes are simulated numerically.
为了验证方法的精度和效率问题，对两种典型缓坡地形上的波浪传播变形进行了数值模拟。
3
The rigorous coupled-wave theory is used to analyze the characteristics of grating diffraction, and the results indicate that this method produces no phase distortion.