Journal of Navigation and Port Research 2013;37(5):463-469.
Published online October 31, 2013.
장애물 위치에 따른 GPS 기준국 측위정확도 변화분석
손동효, 박관동, 정완석, 기창돈
An Analysis of GPS Station Positioning Accuracy Variations According to Locations of Obstacles
Dong-Hyo Sohn, Kwan-Dong Park, Wan-Suk Jung, Changdon Kee
Abstract
This paper focuses on GPS positioning accuracy variations according to locations of obstacles which surround GPS station. We derived precise coordinates of a GPS station which has a good visibility. Its observation data was rewritten by assuming signal blocking due to obstacle in the elevation angle of 10° to 70°. We processed daily and hourly data for 10 days. In the results using daily data, RMSE was at 10mm level. And RMSE increased to 100mm levels in case of hourly data. As the elevation angle of obstacle increased, the horizontal and vertical RMSE increased, while the height estimates decreased. These results showed the higher the elevation angle of the obstacle increased the loss of large amounts of data by blocking satellite signals direction. In terms of the direction, when the blocking thing was located in the east or west, the coordinate has larger error in the east-west direction. And if signal was blocked at the south direction, the difference between the east-west error and the south-north position error was reduced.
Key Words: 방향 GPS;positioning accuracy;obstacles;elevation angle;azimuth angle;direction
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