GPS定位精度與衛星的幾何分佈狀況及接收到之衛星顆數有密切之關係。在一般的定位測量時，往往會遇到衛星顆數不足以及衛星遮蔽之問題。利用地面式之虛擬衛星，可增加觀測量並解決衛星幾何分佈不佳之問題，進而提升定位之精度。

本研究利用單頻快速靜態方法，以未定值函數法來求解加入與未加入虛擬衛星之定位成果。實驗成果顯示，在衛星數充足以及幾何分布佳之情況下，加入虛擬衛星在水平方向之定位精度與不加入時成果相當，僅在高程方向有較明顯之改進。另外在衛星顆數不足以及幾何分布差之情形下，加入虛擬衛星之定位成果，在N、E、U方向皆有明顯之改善。

在利用虛擬衛星作為AFM判斷搜尋的約制條件後，解算搜尋時間可以大大的減少，基線之搜尋時間約為原來搜尋時間之0.2倍左右，且定位成果與未加入虛擬衛星時相當。

The accuracy of GPS positioning has close relations with the geometric distribution of satellites and the amount of satellites the GPS could receive signals from. In general, positioning of surveying, the problem of insufficient satellites and shelter effect often occurred. The use of ground-based Pseudolite (PL), however, could increase the measurement and effectively resolve the problem of disadvantageous geometric distribution of satellites, hence improve the accuracy of positioning.

This research makes use of single-frequency rapid static positioning, and adopts the Ambiguity Function Method (AFM) to test the positioning results under the circumstances with and without PL. As the experiment shows, the horizontal positioning accuracy is similar with or without PL when satellites being sufficient and good geometric distribution, only causes obvious improvement in up direction. But if under the condition that the satellites are not sufficient and bad geometric distribution, PL could help to make distinct improvement in northern, eastern and up directions.

Adding PL data to constraint AFM search conditions, one can reduce much of solving time, the search time is one-fifth of original search time. Moreover, the positioning accuracy is still maintained the same with the case without PL.

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