GNSS测站坐标非线性变化影响机制的研究  

Research on the influence mechanism of the nonlinear variations of GNSS stations'coordinates

作　　者：朱新慧[1] 傅彦博 蔡富 戴海亮 ZHU Xin-hui;FU Yan-bo;CAI Fu;DAI Hai-liang(Institute of Geomatics,Information Engineering University,Zhengzhou 450001,China)

机构地区：[1]信息工程大学地理空间信息学院,郑州450001

出　　处：《地球物理学进展》2020年第1期79-85,共7页Progress in Geophysics

基　　金：国家自然科学基金(41804018)资助.

摘　　要：对影响地球参考框架稳定度与精确度的地球动力学因素进行深入研究,能更好地促进毫米级地球参考架的建立.而研究GNSS测站坐标的非线性变化及其相关机制,是实现毫米级地球参考框架的前提,也为提升GNSS坐标精度、研究地球物理因素等提供参考.首先研究了GNSS测站坐标非线性变化的影响机制与理论改正模型,给出了季节性温度效应、地表物质负荷效应、GNSS周年性系统误差和高阶电离层延迟这四种因素的研究进展,并提出了在机制和模型研究方面一些改进的方向.然后通过以高阶电离层延迟对GNSS测站坐标时间序列的影响为例,进行分组实验,研究了高阶电离层延迟对GNSS测站坐标非线性变化的影响,并进一步将影响进行了量化.研究结果有助于对测站坐标非线性变化的机制做出更精确合理的解释,同时也有助于削弱与限制高阶电离层延迟对建立高精度地球参考框架的影响;为我国北斗地球参考框架的建立与维持提供了可靠的理论基础,具有一定的参考价值.In order to establish a millimeter-scale terrestrial reference frame,it is necessary to study the geodynamic factors that affect the stability and accuracy of the terrestrial reference frame.The research on the nonlinear variations of GNSS stations'coordinates and the mechanism is the premise of realizing the millimeter-scale terrestrial reference frame,and also provides a reference for improving the accuracy of GNSS stations'coordinates and studying geophysical factors.Firstly,the influence mechanism and theoretical correction model of nonlinear variations of GPS stations'coordinates are studied.The research progress of four factors,seasonal temperature effect,surface material load effect,annual error of GPS system and high-order ionospheric delay,is given.Some improvements in mechanism and model research are proposed too.Then,taking the influence of higher-order ionospheric delay on the time series of coordinates of stations as an example,the influence of higher-order ionospheric delay on the nonlinear variations of GPS stations'coordinates is studied by setting up group experiments,and the contribution of higher-order ionospheric delay to the nonlinear variations of GPS stations'coordinates is quantitatively analyzed.The results are helpful to make a more accurate and reasonable explanation for the mechanism of the nonlinear variations of GPS stations'coordinates,and to weaken and limit the influence of higher-order ionospheric delay on the establishment of a high-precision terrestrial reference frame.The research on the influence mechanism of the nonlinear variations of GPS stations'coordinates can provide a reliable theoretical basis for the establishment and maintenance of Beidou Terrestrial Reference Frame in China,and has a certain reference value.

关 键 词：地球参考框架 非线性变化 影响机制 高阶电离层延迟 

分 类 号：P228[天文地球—大地测量学与测量工程]