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†,*,** Graduate school of Inha University, Incheon 402-751, Korea*** Department of Geoinformatic Engineering, Inha University, Incheon 402-751, Korea  :     GPS   GPS           .       GPS   ,           GPS           . GPS   GIPSY 5.0 ,       AWS   .            ,   GPS      RMSE ZHD 0.7mm, ZWD 7.5mm, ZTD 8.7mm .                .     297km (SUWN) (MKPO)    36%    . : GPS, , , , Abstract : GPS signal delay that caused by dry gases and water vapor in troposphere is a main error source of GPS point positioning and it must be eliminated for precise point positioning. In this paper, we implemented to generate tropospheric delay grid map over the Korean Peninsula based on post-processing method by using the GPS permanent station network in order to determine the availability of tropospheric delay generation algorithm. GIPSY 5.0 was used for GPS data process and nationwide AWS observation network was used to calculate the amount of dry delay and wet delay separately. As the result of grid map's accuracy analysis, the RMSE between grid map data and GPS site data was 0.7mm in ZHD, 7.6mm in ZWD and 8.5mm in ZTD. After grid map accuracy analysis, we applied the calculated tropospheric delay grid map to single frequency relative positioning algorithm and analyzed the positioning accuracy enhancement. As the result, positioning accuracy was improved up to 36% in case of relative positioning of Suwon(SUWN) and Mokpo(MKPO), that the baseline distance is about 297km.Key words :GPS, ZTD, ZHD, ZWD, Grid Map †:, dskim@inha.edu 032)873-4310 * , jhwon1021@inha.edu 032)873-4310 ** , h79s86@gmail.com 032)873-4310*** , kdpark@inha.ac.kr 032)860-7604

Generation of Grid Maps of GPS Signal Delays in the Troposphere and Analysis of Relative Point Positioning Accuracy Enhancement