Dynamic Monitoring System Of High Rise Building Based On GPS+BDS

With the development of urbanization in China,high-rise residential buildings are more and more in our view.Therefore,with the emergence of a large number of high-rise and super high-rise buildings,the monitoring of dynamic deformation of high buildings becomes extremely critical.Through real-time dynamic deformation monitoring for high-rise buildings,we can accurately predict possible disasters in buildings and take measures to avoid major accidents.This paper implemented the differential positioning technology of BDS/GPS fusion systems.The results of nine combinations of three navigation and positioning systems are compared,the prototype software of positioning has also been designed.In the three positioning methods,the ionosphere is delayed by the combination of no ionosphere,and Hopfiled model is used to deal with tropospheric delay.For the pseudo range positioning,the least square method is used to solve the equation,while for the carrier phase dual difference positioning,M-W combination method is used to detect the large cycle slips,and using ionosphere residual combination to detect small cycle slips.After the integer ambiguity is fixed by LAMBDA algorithm,the stationary solution is solved by Kalman filter.The accuracy of BDS pseudo range single point positioning is about 5m.The accuracy of BDS pseudo range double difference positioning is about 0.5m.The accuracy of BDS carrier phase double difference positioning is about 1.2cm.The accuracy of GPS pseudo range single point positioning is about lm.The accuracy of GPS pseudo range double difference positioning is about 0.4m.The accuracy of GPS carrier phase double difference positioning is about 1.1cm.The accuracy of pseudo range single point positioning of BDS/GPS fusion system is about 1.5m.The accuracy of pseudo range double difference positioning in the fusion system is about 0.4m.The accuracy of the dual phase positioning of the carrier phase in the fusion system is about 0.8cm.In the BDS,GPS and BDS/GPS dual system comparison,it can be concluded that the positioning accuracy of BDS/GPS fusion differential positioning technology is higher than that of BDS,GPS and BDS/GPS dual system by pseudo-point single point positioning,pseudo range double difference location and carrier phase double difference positioning.It can be used for post-data processing,such as terrain mapping,deformation monitoring,channel measurement and basic geographic information data acquisition and other practical applications.