利用高斯平滑法提取GPS观测序列中的结构振动监测信号

Using Gaussian smoothing method for extracting structural vibrations from GPS displacement time series

利用GPS进行结构振动监测时,GPS观测信号噪声非常大。文章分析了GPS信号误差来源,根据相邻两天GPS观测值多路径误差强相关性,提出了利用高斯平滑法从带有噪声的GPS位移序列中提取真正的振动信号。实测数据分析表明,该方法能有效地抑制GPS多路径效应与测量噪声,成功提取结构振动信息。

The observation signal of the GPS is usually very noisy when it is used for structural vibration monitoring.The error source of GPS signals is analyzed in this paper.Based on the fact that the multipath error of GPS observations in sequent two days is awfully correlative,the Gaussian smoothing method is proposed to extract the real structural vibrations from the noisy GPS displacement time series.Experimental data analysis results show that this method can mitigate the multipath error and observation noise,and it can extract real structural vibration signals successfully.