利用GPS观测数据研究高频地球自转参数  

On the High-Frequency ERPs with GPS Observations

作　　者：魏二虎[1] 李广文[1] 畅柳[1] 曹起[2] 

机构地区：[1]武汉大学测绘学院,武汉市珞喻路129号430079 [2]上海岩土工程勘察设计研究院有限公司,上海市小木桥路681号200032

出　　处：《武汉大学学报（信息科学版）》2013年第7期818-821,886,共4页Geomatics and Information Science of Wuhan University

基　　金：国家863计划资助项目(2008AA12Z308);国家自然科学基金资助项目(40974003);卫星导航定位系列课程国家级教学团队资助项目(214275482)

摘　　要：介绍了利用GPS解算地球自转参数的理论与方法,选取80个左右的IGS参考站以8h观测弧段进行GPS数据处理,分析解算了2h时间间隔地球自转参数序列值。对以上基于GPS观测解算的高频时间序列值进行小波降噪,并利用FFT频谱分析的结果获得了地球自转参数的周日项、半周日项。This paper introduces the theory and method for Earth rotation parameter solu- tions using GPS observations. After several tests and comparisons, more than 80 IGS refer- ence stations distributed globally averagely were to provide observation data with a length of eight hours as a calculation epoch. The ERP time series at the middle point of an epoch with an interval of two hours was obtained by utilizing precise positioning software, GAMIT. The high-frequency time series of earth rotation parameter was initially de-noised by wavelet and then analyzed with fast Fourier spectrum analysis to get the diurnal and semi-diurnal ERP variations. Finally, high-frequency ERP variations with compared with tidal informa- tion to determine the excitation mechanism.

关 键 词：GPS 地球自转参数 GAMIT 频谱分析 

分 类 号：P228.41[天文地球—大地测量学与测量工程]