| Summary: | 碩士 === 國立臺灣海洋大學 === 通訊與導航工程系 === 96 === In this thesis, the concept of the wide-area differential GPS(WADGPS) is studied and applied. Some further refinement is applied so that the concept of WADGPS can be used in Taiwan is also performed.
The navigation data used to perform the WADGPS analysis in this thesis is based on the practical dual-frequency data collected at the satellite tracking stations maintain by Taiwan Satellite Survey Center, Department of Land Administration(M.O.L).
The collected data together with the known position of the satellite tracking station are used to derive the WADGPS corrections, which are then used to perform a WAGPS positioning to improve the positioning accuracy.Usually, to obtain a WADGPS correction, four ground stations are needed. However, due to the limitation of the gevgraphical area, WADGPS positioning results using four base stations are significantly degraded in accordance with the experimental results.
We therefore propose a modification of the traditional WADGPS concept. In other words, three base stations are used to overcome the poor geometry while using four base stations. Currently, based on the experimental results, the positioning accuracy can be improved by utilizing the proposed method.
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