GPS小波去噪的误差方差建模技术与试验

Technique and Test of Error Variance Modeling of GPS’s Reducing Noise Using Wavelet Transform

摘要:

如何消除GPS观测数据的噪声以提高定位精度并估算消噪信号的误差方差对工程测量具有重要意义。在介绍小波多尺度分析的基础上,推导了在小波多尺度分析中平滑信号误差的理论方差模型,并通过实际的GPS单点静态定位试验给予验证。试验结果表明,该方法在有效消除噪声的同时,计算得到的各尺度平滑信号的误差方差与理论方差模型基本一致。

Abstract:

It has important sense for the engineering measurement to remove the noise in GPS’s observation data and estimate the error variance of the reduced-noise GPS signal. On the basis of the wavelet’s multi-scale analysis introduced, the theoretical error variance model of smooth signal was deduced in the process of wavelet’s multi-scale analysis. At last the experiment of practical GPS single-point static position was carried out to validate the above model. The experiment results show that this method can reduce the noise of GPS, at the same time the calculated error variance of smooth signal in every scale is nearly consistent with the theoretical error variance model.