桥面复杂环境下BDS/GPS数据质量监测与分析

Detection and Analysis of BDS/GPS Data Quality in Complex Environments of Bridge Deck

分别阐述了BDS/GPS多路径效应的产生机理以及相应的消除和削弱措施,利用统计分析方法对桥梁变形监测过程中复杂环境下监测点的BDS/GPS的多路径效应进行对比分析,以及分析BDS、GPS多路径误差与桥梁桥塔、缆索、车流量等影响因素的关系。实测数据结果表明,GPS的多路径效应值相比于BDS的GEO卫星较大,与IGSO卫星基本相同,优于MEO卫星;多路径误差与卫星高度角呈负相关关系;桥梁桥塔、缆索、车流量是影响多路径效应的重要因素。

The mechanism of BDS/GPS multipath effects and the corresponding elimination and weakening measures are described respectively in this paper.The statistical analysis method is used to analyze the BDS/GPS multipath effects of monitoring points in complex environments during bridge deformation monitoring.Moreover,the influences of bridge tower,cable,traffic flow on BDS/GPS multipath error are also investigated.According to the measured data,the following conclusions are drawn：compared with BDS satellites,the multipath effect value of GPS,is basically the same as that of IGSO satellite but larger than that of GEO satellite and superior to that of MEO satellite;the multipath error is negatively correlated with the satellite elevation angle;bridge tower,cable and traffic flow are key factors of the multipath effects.