中文说明：
基于matlab运用最小二乘法对信号进行消除趋势项处理以及五点三次平滑法对信号进行平滑处理，消除毛刺等。
English Description：
Based on MATLAB, the least square method is used to eliminate the trend item of the signal, and the five point cubic smoothing method is used to smooth the signal and eliminate burrs