基于PPP的iGMAS综合产品应用测试

基于iGMAS产品综合与服务中心（ISC）发布的ISC产品及德国波茨坦地学研究中心（GFZ）发布的GBM产品和GBM钟差重采样后的GBM-300 s产品对MGEX测站进行多系统的精密单点定位（PPP）测试，对2018-01-01～01-15全球15个MGEX测站的定位精度、收敛速度、ZTD求解精度和测站钟差求解精度进行分析。结果表明，在北斗PPP方面，使用ISC产品的3D定位精度和收敛速度优于GBM产品0.89 mm和 24 min，ZTD解算精度和测站钟差求解精度优于GBM产品0.3 mm和0.02 ns；在GPS、GLONASS、Galileo单系统PPP和四系统组合PPP方面，使用ISC产品的ZTD求解精度和测站钟差求解精度同GBM产品互差小于1.5 mm和0.05 ns，两者性能一致，没有明显差别，但使用ISC产品的PPP定位精度在高程方向低于GBM产品2~3 mm，收敛速度慢于GBM产品5~20 min。通过分析iGMAS产品的精度和服务的可靠性，为现阶段iGMAS产品性能的进一步提升给出建议。

Application Test of iGMAS Integrated Products Based on PPP

We perform multi-GNSS precise point positioning(PPP) testing on MGEX stations based on the ISC products released by the iGMAS Product Integration and Service Center(ISC), the GBM products released by the Helmholtz-Centre Potsdam-German Research Centre for Geosciences(GFZ), and the GBM-300 s products based on re-sampling of GBM clock products. This paper analyzes the positioning accuracy, convergence rate, ZTD accuracy and station clock accuracy of 15 MGEX stations around the world from January 1 to January 15, 2018. The experimental results show that the 3D positioning accuracy and convergence rates of Beidou PPP based on the ISC products are better than GBM products for 0.89mm and 24 min; the ZTD accuracy and station clock accuracy of the Beidou PPP based on the ISC products are better than GBM products for 0.3 mm and 0.02 ns; the difference between the ZTD accuracy and the station clock of the GPS, GLONASS, Galileo PPP and the four system combination PPP based on the ISC products, as compared with that based on the GBM products is less than 1.5 mm and 0.05 ns. However, the positioning accuracy of the PPP based on ISC products is lower than that based on GBM products for 2 to 3 mm in the Up direction and the convergence rate of the PPP based on ISC products is slower than that of GBM products for 5 to 20 min. This paper analyzes the accuracy and service reliability of iGMAS products, and gives suggestions for the improvement of iGMAS product performance.