Abstract
Abstract. The surveying and mapping administrative competent departments in 31 provinces (autonomous regions and municipalities) have built provincial-level satellite navigation and positioning reference stations and data centers, and provided CORS services. This provides a good condition for exploring the application of geological hazard monitoring and early warning using Virtual Reference Station (VRS) service based on CORS. At present, the layout mode of "one point one reference station" is usually adopted, when GNSS is used for geological disaster monitoring and early warning. However, the high deployment cost of this plan limits its largescale promotion and application. Using the existing CORS service resources of natural resource system, this paper carried out the application experiment of virtual reference station in geological hazard monitoring application at Huanglongya geological hazard monitoring site in Shaanxi Province, and assessed the virtual reference station data quality, comparative analyzed the precision of static baseline processing results and GNSS real-time deformation monitoring results. The experimental results show that the overall quality of virtual reference station data is better than that of the monitoring station, and the accuracy of the static baseline calculation results is better than 1.0cm in the X direction, and better than 2.0cm in the Y direction and Z direction, which is similar to the static baseline calculation results formed by the physical reference station. The accuracy of the baseline results of real-time observation data calculation is better than 5mm in horizontal RMS and 15mm in vertical RMS. Therefore, it can be seen that the virtual reference station is feasible to be used as the reference station for geological disaster monitoring. In addition, the application experiment of network RTK real-time dynamic single epoch positioning mode is also carried out in geological hazard monitoring. The experimental results show that the RMS values of all three directions are ±3.7mm, ±9.2mm and ±5.0mm respectively, which meet the precision requirements of GNSS disaster monitoring. Therefore, it is also a feasible scheme for geological disaster monitoring and early warning.
Highlights
China is a country with frequent occurrence of geological disasters
The observation data of the Virtual Reference Station (VRS) is that the data center uses the precise known coordinates and real-time observation data of the physical reference stations around the user to model the tropospheric delay and ionospheric delay, so as to calculate and simulate the tropospheric delay The observation data of virtual reference station is sent to the user terminal according to the standard RTCM format, so as to realize the centimeter level high-precision real-time positioning
Reduce monitoring cost significantly: for the areas with frequent geological disasters, such as the virtual reference station established by VRS technology, the number of geological disaster monitoring areas can be far greater than the number of physical reference stations in theory, reducing the cost of building stations
Summary
The Ministry of natural resources has built a national satellite navigation and positioning reference station network of 360 stations. The provincial CORS has been built, and the high-precision centimeter level navigation and positioning service coverage in all provinces has been achieved in real time. This provides a good infrastructure for the application pilot and test of geological disaster monitoring based on the VRS technology of CORS. The observation data of the VRS is that the data center uses the precise known coordinates and real-time observation data of the physical reference stations around the user (at least three stations) to model the tropospheric delay and ionospheric delay, so as to calculate and simulate the tropospheric delay The observation data of virtual reference station is sent to the user terminal according to the standard RTCM format (rtcm3.3 at present), so as to realize the centimeter level high-precision real-time positioning. (5) The simulation mathematical model of orbit error and tropospheric delay based on the geometric relationship between stations and satellites is shown in equation (see equation 6)
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