| Summary: | 碩士 === 國防大學中正理工學院 === 軍事工程研究所 === 93 === A stable and reliable positioning result of current GPS techniques can hardly be achieved mainly because of the observation errors and inherent problems. For short baselines, the multipathing effect caused by the environment of GPS operation stations is considered as the key problem of current positioning techniques. In order to reduce the effect of multipath and resolving the inherent problems for the enhancement of GPS positioning results, the initial investigations on the environments of GPS operation station and the behavior of multipath have been conducted firstly by two approaches of multipath estimations. However, different algorithms of multipath estimations may lead to quite different results.
On the basis of former research results in this thesis, the verification of these estimations is carried expansively on short baseline trials at various GPS operation environments and different observation periods to see the positioning performance before/after the processing of corresponding errors or problems. The final results have shown that the accuracy of GPS positioning in the test trials over short baselines can be significantly enhanced after the correction of multipath based on the procedure of CCQC, and a much more steady and reliable positioning performance can be obtained based on the processing strategies of bad observation satellites. Meanwhile, a better performance of Differential GPS positioning be achieved without a long time operation as long as the related errors are reduced with the suggested methods in this thesis.
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