Analysis on the Position Accuracy through the Improvement of the VRS-GPS Controller System

Abstract

As the requirement for accurate positional information in real-time is increasing recently in various industrial fields, there are studies conducted actively on the mobile positioning using GNSS and smart devices. In this study, the controller system of the VRS-GPS (Network-RTK) device was improved and exclusive APP (SGSA; Smart Gps Survey App) was developed to perform analysis on the position accuracy compared with the existing GPS devices. In addition, Java Delphi C# Program was used for improving the VRS-GPS controller system, and the developed system was able to enhance the processing speed, efficiency and user environment. L1, L2 and SGSA of the existing GPS device were used to perform position accuracy analysis on test points of 20 national control points. As a result, PDOP was able to obtain the result values on average between 1.0 ~ 2.0 on L1, L2 and SGSA, which is considered to be fully reliable on the geometric position accuracy arrangement of the satellite. In addition, in the case of the H-RMSE, the SGSA measurement values were derived to be 0.004 m ~ 0.006 m, and the V-RMSE showed 0.007 m ~ 0.012 m of result values. The developed SGSA showed relatively lower result values than the accuracy of existing GPS device, but certain parts were satisfied through the aerial photograph measurement and public surveying work standard, which is considered to be possible for use in the field as the standard point and application measurement. Keywords: VRS-GPS, SGSA, Nation Control Points, Position Accuracy Analysis