详细画出了时域和频域的相关图，对于初学者具有参考意义，仿真图是速度、距离、幅度三维图像。- Correlation diagram shown in detail the time domain and frequency domain, For beginners with a reference value, FIG simulation speed, distance, amplitude three-dimensional image.

数学方法是部分子空间法，仿真图是速度、距离、幅度三维图像，详细画出了时域和频域的相关图。- Mathematics is part of the subspace, FIG simulation speed, distance, amplitude three-dimensional image, Correlation diagram shown in detail the time domain and frequency domain.