TROPICAL GEOGRAPHY ›› 2016, Vol. 36 ›› Issue (4): 717-726.

### Beidou and GPS Integrated High Precision Positioning and Monitoring Analysis of Bridges

PENG Zhenzhong1,2，LI Qianxia1，XU Zhiqiu3，YANG Bo3，XIA Linyuan1

1. （1．School of Geography and Planning，Sun Yat-Sen University，Guangzhou 510275，China；2．Guangzhou Urban Planning & Design Survey Research Institute，Guangzhou 510060，China；3．Guangdong Hydropower Planning & Design Institute，Guangzhou 510635，China）
• Received:2016-04-14 Online:2016-07-05 Published:2016-07-05

Abstract:

Global Navigation Satellite System (GNSS) can provide real-time precise positioning services anytime and anywhere so that it is used extensively on deformation monitoring. However, signals of GNSS satellites are easily blocked and interfered by the surrounding like high-rise buildings, people and etc. A large number of infrastructures are located in harsh environment, such as valley, urban canyon and high vehicle - density areas. The availability of satellite positioning in deformation monitoring under the blockage environment was analyzed in this paper. Beidou system has three types of orbits including GEO, IGSO and MEO, which is different from the GPS. Each orbit type has different characteristics, and has different influence on positioning accuracy. Taking Guangzhou Bridge as an example, this paper studied integrated Beidou/GPS precise positioning and positioning with different combinations between GEO, IGSO and MEO. Then, the availability of various positioning was analyzed. Results show that, the accuracy of both Beidou and Beidou/GPS reach millimeter level, which can well meet the demands of deformation monitoring. Besides, Beidou/GPS integrated positioning can increase the number of visible satellites and improve geometric distributions. Since the elevation angles of GEO and IGSO satellites are larger and the accuracy of positioning using GEO and IGSO satellites can achieve 1 centimeter, the availability of GNSS positioning in blockage areas is improved. Therefore, it is hopeful to build an automatic real-time precise system to monitor deformation and disaster at any time.