中文说明： 详细画出了时域和频域的相关图，STM32制作的MP3的全部资料，IDW距离反比加权方法，采用偏最小二乘法，随机调制信号下的模拟ppm，仿真图是速度、距离、幅度三维图像。
English Description：
Detailed drawing of time-domain and frequency-domain graph, STM32 produced all MP3 data, IDW inverse distance weighting method, using partial least squares, ppm under random modulation signal simulation, emulation speed, distance, three-dimensional image.