多GNSS系统组合PPP定位精度评估

Position Accuracy Evaluation of Multi-GNSS System Combined PPP

采用MGEX网提供的GPS、GLONASS、BDS、GALILEO四系统双频观测数据,以CODE、GBM、WUM、GRG精密产品进行了静/准动态模式下多系统组合无电离层延迟PPP浮点解与整数钟法固定解实验。结果表明多系统的组合提升了定位精度,尤其是GLONASS的加入效果最明显,CODE与GBM产品的解算精度优于WUM、GRG产品。部分模糊度固定相比全模糊度固定的效果显著,模糊度固定明显缩短了PPP收敛时间,在静态模式下相对浮点解精度提升10%以内,动态模式下E方向与U方向精度提升效果最好。

In this paper,based on GPS,GLONASS,BDS,and GALILEO foursystem double frequency observation data provided by MGEX network,we used CODE,GBM,WUM,and GRG precision products to perform multisystem combination without ionospheric delay PPP float solution and fixed solution experiments in static/quasi-dynamic mode.The results show that the multi-system combination can improve the positioning accuracy,especially the addition of GLONASS is the most obvious.The solution accuracy of CODE and GBM products are better than that of WUM and GRG products.The effect of partial ambiguity fixed compared to full ambiguity fixed is significant.The fixed ambiguity significantly shortens the convergence time of PPP,and the relative float solution accuracy is improved by less than 10%in static mode.The accuracy improvements in E direction and U direction are the best in dynamic mode.