BDS精密单点定位在桥梁变形监测中的应用

Application analysis of BDS precise point positioning in bridge deformation monitoring

桥梁变形监测是进行桥梁健康评估和后期修缮的重要内容.本文基于北斗卫星导航系统(BDS)精密单点定位技术,对实时采集的高频率BDS/GPS数据进行精密单点定位(PPP)静态和动态处理,并以相对静态定位结果作为参考,分析在桥梁复杂环境下BDS的PPP的精度,并把北斗动态PPP结果与GPS做对比.研究结果表明,在1 h连续变形监测时间左右,北斗静态PPP精度和BDS动态PPP定位精度可以达到厘米级,可以监测出大型车辆经过桥梁时的变形情况,并与GPS监测变形趋势基本一致.

Bridge deformation monitoring is an important part of bridge health assessment and repair.Based on BDS's precise single-point positioning technology,this paper conducts PPP static and dynamic processing on high-frequency BDS/GPS data collected in real time,and uses relative static positioning results as a reference to analyze the precision of BDS's precision single-point positioning in a complex bridge environment.Compare BDS dynamic PPP results with GPS,the research results show that the BDS static precision single point positioning accuracy and the BDS dynamic PPP positioning accuracy can reach centimeter level around 1 h continuous deformation monitoring time.We can monitor the deformation of large vehicles passing through the bridge,which is basically consistent with the GPS monitoring deformation trend.With the continuous improvement of BDS's positioning accuracy,BDS's precise single-point positioning can become a new method for bridge deformation monitoring.