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中文摘要：
北斗卫星导航系统（BeiDou satellite navigation system,BDS）目前暂未具有全球导航定位能力,卫星轨道的全程跟踪与测站的几何结构还不完善,影响了卫星轨道的测定精度。针对上述问题,根据动力学定轨的原理与方法,推导了多个全球导航卫星系统（global navigation satellite system,GNSS）联合定轨对参数求解精度的解析贡献量,并利用实测数据分析了BDS/GPS联合定轨对轨道和钟差求解精度的统计贡献量。结果表明,联合定轨对系统间公共参数求解精度的贡献显著,除地球静止轨道（geostationary orbit,GEO）卫星外,其余轨道和钟差求解精度均有显著提高。BDS/GPS联合定轨对BDS卫星轨道、卫星钟差均方根误差（root mean square,RMS）以及接收机钟差RMS的统计贡献量分别为36.21%、26.88%和20.88%,其中对可视卫星数较少的区域接收机钟差求解精度的贡献尤为显著,贡献量为45.95%。
英文摘要：
BeiDou Navigation Satellite System （BDS） has yet to meet the needs of global navigation and positioning as the satellite tracking and the geometry of reference station are not precise . These situations influence the accuracy of satellite orbit determination. In view of these problems, based on dynamic orbit determination theory and methods, the analytical contribution value of multi-GNSS combined orbit determination was applied to improve the precision of parameter solutions. Using meas- ured data, the statistical contribution values of BDS/GPS combined orbit determination to the solution precision of orbit and clock error was analyzed. Results show that the contribution of combined orbit determination to the solution precision of common parameters shared by different systems is signifi- cant. The solution precision for orbit and clock error was significantly improved except in the case of GEO satellites. The statistical contribution values of BDS/GPS combined orbit determination to the precision of BDS satellite orbit, the RMS of BDS satellite clock error and the RMS of receiver clock er- ror were 36.21%, 26. 88% and 20.88% respectively. The contribution of receivers in areas with few visible satellites to the clock error was particularly significant, the contribution value is 45.95%.
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