vbICA方法用于GNSS坐标序列共模误差提取研究  

Study on the vbICA Common Mode Error Extraction on GNSS Coordinate Series

作　　者：张双成[1,2] 李军 安宁康 冯智杰 吕佳明 王杰 叶志磊 ZHANG Shuangcheng;LI Jun;AN Ningkang;FENG Zhijie;LU Jiaming;WANG Jie;YE Zhilei(School of Geological Engineering and Geomatics,Chang’an University,126 Yanta Road,Xi’an 710054,China;State Key Laboratory of Geo-Information Engineering,1 Mid-Yanta Road,Xi’an 710054,China)

机构地区：[1]长安大学地质工程与测绘学院,西安市710054 [2]地理信息工程国家重点实验室,西安市710054

出　　处：《大地测量与地球动力学》2024年第5期450-455,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(42074041);地理信息工程国家重点实验室开放基金(SKLGIE2022-ZZ2-07);自然资源部陕西西安地裂缝与地面沉降野外科学观测研究站开放课题(2022-04)。

摘　　要：全球导航卫星系统(global navigation satellite system,GNSS)坐标序列精度主要受共模误差(common mode error,CME)影响。为提高GNSS坐标序列精度,采用变分贝叶斯独立分量分析方法(variational Bayesian independent component analysis,vbICA)提取实验区20个GNSS测站坐标序列的CME,并对比分析vbICA与主成分分析(principal component analysis,PCA)和独立分量分析(independent component analysis,ICA)的滤波性能。结果表明,vbICA滤波效果优于PCA和ICA;经vbICA滤波后,E、N、U方向坐标残差序列均方根(RMS)平均降低36.57%、31.63%、10.97%,距离相关系数平均降低60.53%、56.84%、25.80%;扣除CME后,GNSS速度场估计更加可靠和精确,可有效提高GNSS坐标序列精度,为地球动力学研究提供可靠的数据支撑。Global navigation satellite system(GNSS)coordinate series accuracy is mainly affected common mode error(CME)influence.In order to improve the accuracy of GNSS coordinate series,this paper adopts variational bayesian independent component analysis(vbICA)method to extract CME of coordinate series of 20 GNSS stations in the experimental site,and uses distance correlation coefficient and root mean square(RMS)as indicators to evaluate the filtering effect of the original coordinate series.The filtering performance of vbICA method is compared with PCA and ICA.The results show that the filtering effect of vbICA is obviously better than PCA and ICA.After vbICA filtering,the RMS of residual coordinate series in E,N,U direction decreases by 36.57%,31.63%and 10.97%on average.Distance correlation coefficient decreased by 60.53%,56.84%and 25.80%on average.Considering the optimal noise model and excluding CME,GNSS velocity field estimation is more reliable and accurate,effectively improving GNSS coordinate series accuracy,and providing reliable data support for geodynamic research.

关 键 词：GNSS坐标序列 变分贝叶斯独立分量分析 共模误差 距离相关系数 速度场 

分 类 号：P228[天文地球—大地测量学与测量工程]