基于北斗三号区域短报文通信的滑坡灾害监测数据传输方案设计

稳定的有线/无线通信链路是北斗/GNSS-RTK技术应用于滑坡灾害监测的必要条件，当监测区域地面通信基础设施缺失或突发险情引起通信链路中断时，滑坡监测工作难以开展。针对于此，研究并分析了北斗三号区域短报文通信（regional short message communication，RSMC）技术应用于滑坡灾害监测的可行性。首先设计了一种基于北斗三号RSMC的GNSS观测数据编码方法，在此基础上分析了基准站与流动站观测数据的不同传输方案对滑坡灾害监测的影响。最后对其中两种可行性较高方案的通信指标与定位效果进行了评估，结果表明，基准站采用4G、监测站采用北斗三号RSMC的第一种传输方案，平均解算时延优于1.1 s，传输成功率可达98.46%，实时监测序列精度在水平方向优于1cm，高程方向可达厘米级水平。该方案保持了监测序列的高频率高精度实时获取，同时提升了地面通信受限时监测信息的可用性。

Design of landslide hazard monitoring data transmission scheme based on BeiDou-3 regional short message communication

Stable wired/wireless communication links are essential for the application of BeiDou/GNSS-RTK technology to landslide hazard monitoring. When the ground communication infrastructure in the monitoring area is missing or the communication links are interrupted due to sudden danger, it is difficult to carry out landslide monitoring. To solve this problem, the feasibility of applying BeiDou-3 regional short message communication (RSMC) technology to landslide hazard monitoring is investigated and analyzed. Firstly, a method of encoding global navigation satellite system(GNSS) landslide hazard monitoring observation data based on BeiDou-3 RSMC is designed. Then the impact of the different transmission schemes of the base station and rover station on landslide hazard monitoring is analyzed. Finally, the communication indexes and positioning effects of the two feasible schemes are evaluated. The results show that the transmission scheme 1, which uses 4G means as the reference station and BDS-3 RSMC means as the monitoring station, has an average solution delay of better than 1.1 s,a transmission success rate of 98.46%, and a real-time monitoring sequence accuracy of better than 1 cm in the horizontal direction and up to the level of cm in the elevation direction. The scheme maintains the high frequency and high accuracy of the monitoring sequence in real time, and improves the availability of monitoring information when ground communication is limited.