GNSS-PPP多系统多频点组合定位精度分析

Precision analysis of multi-system and multi-frequency points combined positioning for GNSS-PPP

为了进一步推广全球卫星导航系统(GNSS)精密单点定位(PPP)技术并实现多GNSS-PPP工程应用,基于国际GNSS服务组织(IGS)多模GNSS实验跟踪网(MGEX)测站数据,研究GNSS-PPP组合定位的精度以及性能:介绍和分析4大GNSS综合PPP技术;并采用多系统多频点组合定位测试PPP的收敛时间和定位精度,同时针对不同高度截止角对比分析单GPS-PPP与多GNSS-PPP效果。结果表明:多系统组合定位比单GNSS系统在精度以及收敛时间上都有显著改善,东、北、高3个分量的精度可平均提升30.7%,收敛时间可降低55.3%;由于多系统组合定位增加了可见卫星数,因此截止高度角对GNSS-PPP结果影响较小。

In order to further promote precise point positioning(PPP)technology of global navigation satellite system(GNSS)and realize multi-GNSS-PPP engineering application,based on the data of International GNSS Service-multi GNSS experiment(IGS-MGEX)station,the paper studied the accuracy and performance of GNSS-PPP:four GNSS integrated PPP technologies were introduced and analyzed;and the convergence time and positioning accuracy of PPP were tested by multi-system and multifrequency positioning;then the positioning results of single GPS-PPP and multi-GNSS-PPP were comparatively analyzed for different height cutoff angles.Results showed that the accuracy and convergence time of multi system combined positioning could be significantly improved than that of single GPS system,the accuracy of ENU three components would be increased by 30.7%on average,and the convergence time would be reduced by 55.3%;moreover,due to the increase of the number of visible satellites in multi system combined positioning,the cut-off altitude angle could have little impact on the GNSS-PPP results.