摘要
为了进一步帮助用户及时了解各分析中心发布的精密轨道和钟差产品质量,改善精密单点定位(PPP)结果的精度和收敛时间,评估分析国际全球卫星导航系统(GNSS)监测评估系统(IGMAS)和国际GNSS服务组织(IGS)不同分析中心的精密产品:针对北斗三号全球卫星导航系统(BDS-3)提供的新频点B1C和B2a,建立BDS卫星端差分码偏差(DCB)改正模型;然后采用北斗卫星导航系统(BDS)B1I/B3I和B1C/B2a组合以及GPS L1/L2组合,针对不同分析中心精密产品选取15个多模GNSS实验跟踪网(MGEX)测站5 d采集数据进行静态和仿动态PPP性能分析。实验结果表明,新频点B1C/B2a组合相较于传统B1I/B3I组合具有更高的定位精度,在静态PPP中,E和N方向上的定位精度可分别提高4.4%和4.3%;此外,不同分析中心精密产品下的BDS/GNSS PPP定位性能存在差异,具体而言,COD、GFZ和WUM产品下的定位性能较好,IAC产品下的定位精度存在波动情况而不太稳定,IGMAS产品定位精度略差于其他分析中心,可能与其轨道产品采样间隔较大有关,SHAO产品在动态PPP中的定位误差较大。
In order to further help users keep up to date with the quality of precision orbit and clock deviation data provided by the analysis centers and improve the accuracy and convergence time of precision single point positioning(PPP)results,the paper assessed and analyzed the precision products from different analysis centers under the international global navigation satellite system(GNSS)monitoring&assessment system(IGMAS)and the International GNSS Service(IGS):the differential code bias(DCB)correction model of BeiDou navigation satellite system(BDS)'s satellite end was established for BeiDou-3 navigation satellite system(BDS-3)'s new frequency points B1C and B2a;then BDS B1I/B3I and B1C/B2a combination and GPS L1/L2 combination were used,and 15 multi-GNSS experiment(MGEX)stations were selected to collect data for 5 days for precision products of different analysis centers for static and para-dynamic PPP performance analysis.Experimental result showed that the B1C/B2a combination could offer superior accuracy than the B1I/B3I combination,with a 4.4%and 4.3%enhancement in E and N directions during static PPP;moreover,variances would exist in BDS/GNSS PPP performance across centers,specifically,COD,GFZ and WUM products would exhibit exceptional results,IAC products would demonstrate overall excellence but with some stabili ty concerns,IGMAS products,due to la rger sampling intervals,would exhibit slightly lower positioning accuracy compared to other centers,and SHAO products would reveal notable fluctuations in positioning errors during dynamic PPP experiments.
作者
徐鑫哲
何秀凤
周峰
袁海军
XU Xinzhe;HE Xiufeng;ZHOU Feng;YUAN Haijun(School of Earth Sciences and Engineering,Hohai University,Nanjing 211100,China;Zhongdian Laisi Information System Co.,Ltd.,Nanjing 210007,China)
出处
《导航定位学报》
CSCD
北大核心
2024年第5期9-18,共10页
Journal of Navigation and Positioning
基金
江苏省研究生科研创新计划项目(422003240)。
