对输入的原始数据qqqq4444，qqqq4444数据需自己手动输入，进行低通滤波，然后进行快速傅里叶变换，最后算出距离(For input raw data, qqqq4444, qqqq4444 data need to be manually input, low-pass filtering, and then fast Fourier transform, and finally calculate the distance)