摘要
针对利用中国区域全球卫星导航系统(GNSS)站网求解极移参数存在Y分量精度显著低于X分量的问题,提出利用姿态测量几何分析方法分析GNSS不同区域站网分布对极移精度的影响:利用9个不同区域站网求解极移参数探究站网区域分布的影响;并以国际地球自转服务组织(IERS)产品为基准评估精度。结果表明,当区域站网的平均子午面与0°子午面的夹角小于45°时,X分量差异的标准差通常大于Y分量;夹角大于45°时,Y分量差异标准差通常大于X分量。为最小代价地进一步提升Y分量精度,通过在中国区域站网基础上引入全球不同位置的单个测站,评估精度提升比例。结果表明,在非洲东南部和澳大利亚地区引入单个测站将Y分量均值平均减小了80%,标准差减小了50%,较全球其他地区测站的提升效果更明显;新增美洲地区测站时存在测量奇点,易造成法方程的矩阵奇异,这是由于美洲测站、国内测站地心矢量及地球自转轴共面,从而削弱了方程结构。
Aiming at the problem that the pole Y coordinate accuracy is significantly worse than the X coordinate when determining Earth rotation parameters(ERP)with regional ground network in China,the paper proposed to use attitude measurement geometric analysis method to analyze the impact of GNSS network’s regional distribution on pole coordinate accuracy:nine regional networks were selected to determine the pole coordinate parameters for exploring the influence of regional distribution of station networks,and the accuracy was evaluated with reference to the International Earth Rotation Service(IERS)14 C04 product.Result showed that when the angle between the mean meridian plane of the regional network and the 0°meridian plane is less than 45°,the standard deviation of the X coordinate difference would be usually greater than that of the Y coordinate;while,when the angle is greater than 45°,the difference standard deviation of Y component would be usually greater than that of X portion.Furthermore,in order to further improve the accuracy of Y component with minimum cost,the accuracy improvement ratio was evaluated by introducing individual stations in different locations around the world based on the Chinese regional station network.Result showed that the added station in southeastern Africa and Australia would bring a maximum mean offset improvement of around 80%,and the standard deviation improvement of around 50%,which could be more significant than the improvement by stations in other parts of the world;however,there would be singularities when new stations in the Americas are added,which may easily cause the matrix singularity of the normal equation,and this is because the stations in South and North America,the Chinese station's geocentric vector and the Earth's rotation axis are in the same plane,the equation structure could be weakened.
作者
方欣颀
范磊
李宗楠
施闯
FANG Xinqi;FAN Lei;LI Zongnan;SHI Chuang(Key Laboratory of Navigation and Communication Fusion Technology,Ministry of Industry and Information Technology,Beijing 100191,China;School of Electronic Information Engineering,Beihang University,Beijing 100191,China;Research Institute for Frontier Science,Beihang University,Beijing 100191,China;School of Electronic Science,National University of Defense Technology,Changsha 410073,China)
出处
《导航定位学报》
CSCD
北大核心
2024年第2期70-78,共9页
Journal of Navigation and Positioning
基金
国家重点研发计划(2023YFB3907302)
国家自然科学基金项目(41931075,42274041)
云南省科技项目(202102AE090051)。
关键词
极移参数
姿态测量几何分析
全球卫星导航系统(GNSS)
不同区域站网
pole coordinate parameters
attitude measurement geometry analysis
global navigation satellite system(GNSS)
different regional ground network
