测站坐标时间序列跳变探测研究及对TRF的影响  

Research on the detection of station coordinate time series jumps and its impact on the terrestrial reference frame

作　　者：李秋霞 王小亚[2,3,4] 冯加良 LI Qiuxia;WANG Xiaoya;FENG Jialiang(School of Environmental and Chemical Engineering,Shanghai University,Shanghai 200444,China;Shangha iAstronomical Observatory,ChineseAcademy of Sciences,Shanghai 200030,China;University of Chinese Academyof Sciences,Beijing 100049,China;Shanghai KeyLaboratoryof Space Navigation and Positing Techniques,Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China)

机构地区：[1]上海大学环境与化学工程学院,上海200444 [2]中国科学院上海天文台,上海200030 [3]中国科学院大学,北京100049 [4]中国科学院上海天文台上海市空间导航与定位技术重点实验室,上海200030

出　　处：《测绘科学》2021年第6期38-46,共9页Science of Surveying and Mapping

基　　金：国家重点研发计划项目(2016YFB0501405);科技部基础性工作专项(2015FY310200);国家自然科学基金面上项目(11973073,11173048,10873029);上海市空间导航与定位技术重点实验室项目(06DZ22101)。

摘　　要：针对地球参考架测站坐标残差数据中仍存在一些较大的未被标注的跳变,这会引起该测站坐标和速度因未标注的跳变而估计有误的问题,该文利用广义离群检测(GESD)算法的粗差和野值探测及基于t-检验序贯格局转换分析(STARS)法的跳变探测,更好地剔除了野值、标志出了未被标注的跳变。由于测站坐标时间序列的复杂性,跳变检测的误报率和漏检时有发生,故该文采用了与STARS方法相结合的差值法和人眼观察法综合检测跳变;然后基于上海天文台建立的中国地球自转与地球参考系服务地球参考架和地球定向参数确定软件包,重新进行地球参考框架建立和维持,消除未标注跳变对地球参考框架的不利影响。结果表明,重新解算的测站坐标残差明显减小,对测站非连续性也有了很好修复,不仅提高了地球参考架精度和稳定性,而且有助于后续周期性信号的拟合和提取。For the fact that there are still some large unlabeled jumps in the coordinate residual data of the terrestrial reference frame station, which will cause the station coordinates and velocity to be estimated incorrectly. For this purpose, this paper used the generalized extreme studentized deviate(GESD) algorithm for gross errors detection and based on the sequential t-test analysis of regime shifts(STARS) method to better eliminate outliers and mark unlabeled jumps. Owing to the complexity of the time series of station coordinates,the false alarm rate and missed detection of jump detection often occur.Therefore,in this paper,we used the differential method and the human eye observation method combined with the STARS method to comprehensively detect the jump.Then,we used the Chinese Earth rotation and reference system service(CERS)establish SHAO terrestrial reference frame(STRF)and Earth orientation parameters(EOP)determination software package developed by the Shanghai Observatory to re-calculated the terrestrial reference frame and eliminate its adverse effects on the terrestrial reference frame.The results showed that the recalculated station coordinate residuals were significantly reduced,and the station discontinuities were also well repaired,which not only improved the accuracy and stability of the terrestrial reference frame,but also facilitated the fitting and extraction of the periodic signals.

关 键 词：跳变 地球参考框架 广义离群检测算法 t-检验序贯格局转换分析法 

分 类 号：P228[天文地球—大地测量学与测量工程]