在线PPP服务系统定位和ZTD估计精度的比较

Accuracy comparison of online PPP service system positioning and ZTD estimation

针对不同全球卫星导航系统(GNSS)在线精密单点定位(PPP)服务系统间的服务特性及性能等存在差异的问题,提出对GNSS在线PPP服务系统的性能进行评估:比较分析5种服务系统(APPS、magicGNSS、CSRS-PPP、Net_Diff、RTX-PP)的服务特性;并分析评估不同服务系统间的动态、静态定位精度和天顶对流层延迟(ZTD)精度。实验结果表明:APPS、magicGNSS.CSRS-PPP和Net_Diff服务系统动态定位均可达到分米级精度,以CSRS-PPP服务系统表现最优;5种服务系统静态定位均可达到厘米级精度,APPS和RTX-PP服务系统静态定位精度明显优于其他系统,更能满足用户厘米甚至毫米级定位的需求;APPS、magicGNSS和CSRS-PPP服务系统解算的ZTD具有较高的精度,与国际GNSS服务(IGS)组织发布的ZTD产品也具有较高的一致性。

Aiming at the problem of different performances of Global Navigation Satellite System(GNSS)online Precise Point Positioning(PPP)service systems,the paper proposed to evaluate the performances of the systems:the service characteristics of five service systems(APPS,magicGNSS,CSRS-PPP,Net_Diff,RTX-PP)were comparatively analyzed;and the accuracy of kinematic and static positioning and Zenith Tropospheric Delay(ZTD)between different service systems was evaculated.Experimental result showed that:the kinematic positioning accuracy of the four service systems(APPS,magicGNSS,CSRS-PPP,Net_Diff)could reach the decimeter level,among which the CSRS-PPP service system would be the best;moreover,the static positioning accuracy of the five service systems could all reach the centimeter level,among which the systems of APPS and RTX-PP would be significantly better than the other systems,even meeting the needs of centimeter-level or millimeter-level positioning;meanwhile,the ZTDs of APPS,magicGNSS and CSRS-PPP service systems would have high accuracy,which could be high consistent with the ZTD products released by IGS as well.