摘要
精确测定地心运动是建立毫米级地心参考框架的前提。随着北斗三号全球系统(BDS-3)的建成运行及BDS-3全球跟踪站的不断完善,研究利用BDS-3估计高精度的地心运动,对建立我国独立自主的参考框架具有重要的科学价值。本文利用BDS-3全球观测数据反演地心运动,分析了BDS-3地心运动中的周期性信号及其与轨道参数之间的相关性。结果表明,BDS-3地心运动与IGS组合产品在X和Y方向具有较好的一致性,差异小于7 mm,Z方向差异较大约21.6 mm。BDS-3地心运动X、Y和Z方向估计误差分别为2.7、2.8和5.3 mm。在地心运动X和Y方向发现与BDS-3卫星轨道重复周期有关的7 d信号,振幅约3 mm;Z方向存在显著的交点年信号的奇数谐波。Z方向估计误差的量级与BDS-3卫星空间构型有关,主要变化周期为1/2、1/4和1/6交点年。当3个轨道面太阳高度角的绝对值差异较小时,地心运动Z方向和轨道参数之间的相关性显著增大,最高可达0.8。
Accurate estimating of geocenter motion is an essential prerequisite for the establishment of geocenter-based terrestrial reference frame at millimeter level.With the commissioning of BDS-3 system and the increasing of BDS-3 tracking stations,determining geocenter motion by BDS-3 is of great scientific value to building the independent terrestrial reference frame of China.This paper determines geocenter motion based on the BDS-3 observations,investigating the spurious periodic signals in geocenter motion time series and the correlation between geocenter motion and orbital parameters.The results indicate that the discrepancy of geocenter motion between BDS-3 estimates and IGS combinations is at the level of 7 mm for the X and Y components,and is about 21.6 mm for the Z component.The formal errors of geocenter motion parameters are 2.7,2.8 and 5.3 mm for the X,Y and Z components,respectively.An evident 7 d signal with the amplitude of about 3 mm is detected over the geocenter X and Y components,which is related to the BDS-3 orbit repeat time.Anomalous odd harmoncis of BDS draconitic year are found in the geocenter Z component.Besides,the magnitude of formal errors of the geocenter Z component is closely related to the geometry of satellite orbit planes,showing the variability with periods at 1/2,1/4 and 1/6 of the draconitic year.When the absolute values of the Sun elevation angle of all the orbital planes are close,the correlation between the geocenter Z component and orbit parameters gets obviously increased,reaching up to 0.8.
作者
郭仕伟
施闯
范磊
魏娜
张涛
方欣颀
周凌昊
GUO Shiwei;SHI Chuang;FAN Lei;WEI Na;ZHANG Tao;FANG Xinqi;ZHOU Linghao(School of Electronic and Information Engineering,Beihang University,Beijing 100191,China;Research Institute for Frontier Science,Beihang University,Beijing 100191,China;GNSS Research Center,Wuhan University,Wuhan 430079,China)
出处
《测绘学报》
EI
CSCD
北大核心
2023年第12期2054-2065,共12页
Acta Geodaetica et Cartographica Sinica
基金
国家自然科学基金(41931075,42174028,42274041)
北京航空航天大学博士研究生卓越学术基金。
