三种多系统开源PPP软件性能比较与分析

为对比PPPH、MG-APP、GAMP三种多系统开源PPP软件的特性，选取6个MGEX测站的观测数据，使用3个PPP软件进行GPS单系统和GRCE多系统精密单点定位解算，分析对比其解算的定位精度、收敛时间和对流层延迟。结果表明，3个软件解算的GRCE多系统的定位精度和收敛时间相比于GPS单系统均有所改善，MG-APP和GAMP解算的定位精度相当而PPPH略差，MG-APP相比于PPPH和GAMP收敛时间更短。3个软件解算的GPS和GRCE静态精密单点定位在平面上优于1 cm，高程上优于2 cm；GPS动态精密单点定位在平面上优于2 cm，高程上优于5 cm；GRCE动态精密单点定位在平面上优于2 cm，高程上优于3 cm。3个软件解算的ZTD与IGS发布的ZTD具有很高的一致性，均能满足ZTD精度要求，GAMP相比于PPPH和MG-APP解算的ZTD稳定性略高。

Performance Comparison and Analysis of Three Kinds of Multi-System Open Source PPP Software

We compare the characteristics of PPPH, MG-APP and GAMP software, select the observation data of six MGEX stations, use the three PPP software to solve the GPS single system and GRCE multi-system precise point positioning, and compare the positioning accuracy, convergence time and tropospheric delay of the three software solutions. The results show that the positioning accuracy and convergence time of GRCE multi-system solved by three software are improved as compared with GPS single system, the positioning accuracy of MG-APP and GAMP is almost the same, while PPPH is slightly worse, and the convergence time of MG-APP is shorter than that of PPPH and GAMP. The GPS and GRCE static precise point positioning calculated by the three software is better than 1 cm horizontally and better than 2 cm vertically. The GPS dynamic precise point positioning calculated by the three software is better than 2 cm horizontally and better than 5 cm vertically. The GRCE dynamic precise point positioning calculated by the three software is better than 2 cm horizontally and is better than 3 cm vertically. The ZTD calculated by the three software are consistent with the ZTD released by IGS, which can meet the accuracy requirements of the ZTD. The stability of ZTD calculated by GAMP is slightly higher than that of PPPH and MG-APP.