The Application of STK-Based Satellite Signal Simulation in GNSS Monitoring for Complex Environments
In order to control the key links of GNSS monitoring more effectively,improve the efficiency and accuracy of GNSS automated monitoring,and realize the effective monitoring of landslide disasters,this paper proposed a GNSS monitoring station analysis technology based on the Satellite Simulation Toolkit(STK)to analyze the GNSS satellite positioning performance in the study area.The method used STK satellite orbit prediction data to establish the Beidou satellite navigation constellation to simulate the satellite motion trajectory and positioning signal transmission process during GNSS monitoring,used drones to obtain high-precision digital elevation models to simulate real ground terrain changes,and established a rigorous scientific analysis method for the deployment of GNSS monitoring equipment.At the same time,a landslide area was selected for engineering verification.The technology was used to analyze the coverage period and duration of GNSS satellites throughout the day.The average monitoring time of MEO satellites was 5.92 h and the average monitoring time of IGSO satellites was 16.87h,which met the full-time effective monitoring of the experimental area.The EDOP,NDOP,VDOP and PDOP values of each point in the experimental area were calculated and the navigation accuracy distribution map was drawn.The positioning accuracy was ideal when the PDOP value in the study area was between 0.891 5 and 0.895 5.The accuracy distribution map could determine that the positioning accuracy at 103°19′E,36°6′N was the best.The engineering verification shows that the GNSS monitoring station analysis technology proposed in this paper can effectively obtain the GNSS navigation satellite positioning accuracy in different areas of the study area,providing a scientific reference for the refined deployment of monitoring stations in complex environments.
railwaylandslideSTKGNSS monitoring simulationnavigation accuracy factormonitoring station siting
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