Application analysis of BDS precise point  positioning in bridge deformation monitoring

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.