A simple and effective adaptive filter is used to decrease statisticnoise of the curve.
最后为了降低曲线的统计噪声，给出了一种简单适用的自适应滤波技术。
2
Because the system equation is changed with time, during the measurement, the statistic character of the system noise and the observation noise cannot be estimated or be determined accurately.
In case of the noisestatistic being unknown or variable, adaptive Kalman filter is used to get drift speed of each axle at each test position, and then drift parameter is calculated.