| Summary: | 碩士 === 國立成功大學 === 測量工程學系 === 87 === The precision of the short-range RTK has proved to meet the requirement of the 3rd and 4rd order control survey. To improve the application scope and efficiency of RTK, this study introduces the medium-range RTK to over-come the constrain in short range.
The medium-range RTK can’t ignore the effects of ionosphere and tropo-sphere. In this study, the modified Hopfield model is used to correct the delay caused by the troposphere. Besides, the ionospheric effects are con-sidered by introducing the adjoint parameters to retrieved the shortage of the model. In order to convert the double-different ambiguity resolutions, a de-correlation method is applied.
This study simulated kinematic positioning with the data from static sur-vey, and compared the results with these postprocessed. We selected 4 base-lines with the ranges of the 10-20 km、20-30 km、30-40 km and 40-50 km to discuss the relation between the distance and resolved time under three diff-erent accuracy criteria of 0.15、0.20 and 0.30 cycles. The results show that the ambiguity can be resolved for the 40-50 km baseline with the criterion of 0.15 and 0.20 cycles where the horizontal and vertical resolution are better than 2 cm and 3 cm, respectively. The results, therefore, confirm the feasibility of the medium-range RTK.
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