| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 93 === The precision of the RTK is 10㎜ ±2ppm for the horizontal and 20㎜ ±2ppm for the vertical distances. However, these precisions are limited when the baseline distance is shorter than 10㎞. In many actual conditions , the distance of a baseline is much more longer than 10㎞, may be 30, 50, even it 70㎞. Therefore, the precision of a long baseline of RTK is a hot study topic for RTK users.
This paper aims to study the precision of a baseline whose distance is more than 30㎞. Using more than three reference stations, a virtual reference station （VRS）can be produced for RTK surveying . From the results, the precision of the VRS is better than traditional RTK which has only a single reference station.
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