基于虚拟参考站的GNSS滑坡地质灾害监测分析

Monitoring and analysis of GNSS landslide geological hazard based on virtual reference station

针对全球卫星导航系统(GNSS)技术在滑坡监测中参考站架设选址难、建设成本高、基准不稳定等问题,使用基于虚拟参考站(VRS)的滑坡地质灾害监测方法,利用卫星导航定位连续运行参考站(CORS)在监测区生成虚拟参考站数据,代替物理参考站进行滑坡监测.实验分析不同解算策略下的虚拟参考站监测精度,并将粗差剔除后的结果与传统GNSS监测进行对比.结果表明:VRS 2 h监测精度平面可达5 mm,高程可达25 mm,所反映滑坡位移趋势与传统GNSS监测一致.

The application of Global Navigation Satellite System(GNSS)technology to landslide monitoring has the problems of difficult location selection of reference stations, high construction cost and unstable datum. The method of monitoring landslide geological disasters based on virtual reference station(VRS)is used. The continuous operation reference station(CORS)is used to generate virtual reference station data in the monitoring area to replace the physical reference station for landslide monitoring.Through experiments and analysis, the monitoring accuracy of virtual reference station under different solution strategies is obtained, and the results after gross error elimination are compared with the traditional GNSS monitoring. The results show that the 2h monitoring accuracy of the virtual reference station can reach 5 mm in plane and 25 mm in elevation. The displacement trend reflected by the virtual reference station is consistent with the traditional GNSS monitoring.