顾及卫星姿态的多系统精密钟差产品综合  

Multi-GNSS clock combination with satellite attitude correction

作　　者：毛姝尹 魏娜[1] 温强 闫哲 MAO Shuyin;WEI Na;WEN Qiang;YAN Zhe(GNSSResearch Center,Wuhan University,Wuhan 430079,China;School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学卫星导航定位技术研究中心,武汉430079 [2]武汉大学测绘学院,武汉430079

出　　处：《全球定位系统》2022年第2期13-20,共8页Gnss World of China

基　　金：国家自然科学基金(41774007);国家自然科学基金(42025401);国家重点研发项目(2018YFC1504002)。

摘　　要：国际GNSS服务(IGS)提供的GPS综合产品被广泛应用于各种高精度科学研究中.随着各国卫星导航系统的发展,亟需研究针对多系统全球卫星导航系统(GNSS)产品的综合策略.由于卫星姿态与钟差相互耦合,综合钟差时额外考虑姿态改正将进一步提高综合产品精度,因此研究了一种顾及卫星姿态的GNSS钟差综合策略,改正姿态后GPS综合残差最大可减小80%.对142个IGS测站进行精密单点定位(PPP)解算发现,综合产品比单个分析中心产品更加稳定,东(E)、北(N)、高(U)方向的动态定位精度最大可提升22.7%、16.7%和18.3%.相对于未顾及姿态改正的综合产品,顾及姿态改正的综合产品的动态定位精度最大可提升65.3%.International GNSS Service(IGS)has been continuously providing high-precision combined GPS orbit and clock products,which is widely used in various scientific research and operational applications.However,with the prosperity of Global Navigation Satellite System(GNSS),combination strategies of multi-GNSS(GPS,GLONASS,Galileo and BDS)products is now urgently needed.Besides,due to the coupling relationship between satellite attitudes and clocks,the clock consistency during combination can be further improved by considering attitude differences.Therefore,we proposed a multi-GNSS clock combination strategy considering attitude correction.It is found that GPS clock combination residuals can be reduced by 80%at most after applying attitude correction.Additionally,we conducted static and kinematic positioning for 142 globally distributed stations using the combined products.Compared to the products provided by a single analysis center,the GPS/GLONASS/Galileo combined products are more stable and can improve the positioning quality up to 22.7%,16.7%and 18.3%for the three components during kinematic positioning.Adding attitude corrections during clock combination can improve the kinematic positioning accuracy up to 65.3%at a single station.

关 键 词：多系统全球卫星导航系统(GNSS) 钟差综合 姿态 钟差一致性 精密单点定位(PPP) 

分 类 号：P228.4[天文地球—大地测量学与测量工程]