安徽省CORS坐标时间序列共模误差与噪声分析

Common mode error and noise analysis of AHCORS coordinate time series

针对目前鲜有学者依据GNSS坐标时间序列数据对安徽省地区共模误差及噪声分析的问题,该文以安徽省卫星定位综合服务系统(AHCORS)2013年1月—2018年6月数据解算得到坐标时间序列为研究对象,采用主成分分析的方法进行空间区域滤波,并计算水文负载、非潮汐大气和非潮汐海洋负载引起的位移单日时间序列,进一步对滤波前后的坐标时间序列进行噪声分析。结果表明,第一主成分对应的空间响应具有非常一致的空间分布模式,通过分析共模误差序列和地表负载均值序列周期性特征发现地表负载并不能很大程度上解释共模误差的来源,且滤波后WN+FN和WN+PL的噪声特性比重均有所下降,但是WN+FN噪声仍然占主导地位,即当共模误差存在时,受其影响会掩盖其测站本身的噪声特性。

In view of the problem that few scholars analyze the common mode error and noise in Anhui Province based on the GNSS coordinate time series data,this paper took the coordinate time series of Anhui Continuously Operation Reference System(AHCORS)from January 2013 to June 2018 as a research object.Common mode error was extracted by principal component analysis based on spatial region filtering.The daily time series of displacements caused by Non-tidal atmospheric loading,Non-tidal oceanic loading and Hydrological loading were calculated.Then the noise of the coordinate time series before and after filtering was analyzed.The results showed that the spatial response of the first principal component had a very consistent spatial distribution pattern.By analyzing the periodical characteristics of common mode error series and average mass loading series,it was found that mass loading could not explain the source of common mode error to a large extent.After filtering,the proportion of WN+FN and WN+PL decreased,but WN+FN noise still dominated,which indicated that when common mode error existed,it would cover the noise characteristics of the station itself due to its influence.