全球衛星定位系統(Global Positioning System, GPS)可得到高精度的定位成果，因此應用廣泛。傳統的衛星定位方式分為單點定位和相對定位兩種，結合了兩項傳統定位方式的優點後，一項新的技術精密單點定位(Precise Point Positioning, PPP)便被提出。然而 GPS PPP 的一大缺點便是過長的收斂時間，同時也限制了 GPS PPP 的應用發展。將 GPS PPP 結合電離層模型，不僅可解決收斂時間過長的問題，同時也可降低定位誤差。目前歐洲定軌研究中心(Center for Orbit Determination in Europe, CODE)有提供全球電離層模型，其利用地面追蹤站的數據建置而成。本研究使用成功大學地科系太空天氣研究室提供的全球電離層模型，利用物理模式產生。探討將 GPS PPP 結合由物理模式產生的全球電離層模型後，能否得到較佳的定位成果。 本研究使用中央氣象局地球物理資料管理系統所提供的三個測站，分別進行靜態以及模擬動態的解算。實驗成果顯示，靜態解算下，結合電離層模型後，皆無法降低定位誤差。模擬動態解算下，結合 CODE 之電離層模型後，可較未結合模型之 GPS PPP 降低 10%的水平方向定位誤差，垂直方向僅有觀測時間的前 20 分鐘可降低 10%的定位誤差；結合成功大學之電離層模型後，同樣可降低 10%的水平方向定位誤差，垂直方向於觀測的前 20 分鐘可降低約 6%的定位誤差。於電離層影響較大的下午12:00~18:00 可降低更多的定位誤差。在收斂時間方面，以水平定位誤差 0.5 公尺及0.3 公尺為門檻，結合任一個模型後，皆可縮短 93.3%及 50%的收斂時間。整體實驗成果顯示，結合由物理模式產生的成功大學模型後，與結合由地面站數據建置成的CODE 模型表現是相近的。

A major disadvantage of Global Positioning System (GPS) Precise Point Positioning (PPP) is the long convergence time. Combining GPS PPP with the ionospheric maps can not only solve the problem of too long convergence time, but also reduce positioning errors. Center for Orbit Determination in Europe (CODE) provides a Global Ionospheric Maps (GIM), but its spatial resolution is difficult to present the ionospheric state in Taiwan in detail. This study uses the GIM provided by the Space Weather Lab of the Department of Earth Sciences, National Cheng Kung University (NCKU), which has higher spatial resolution. Analyze whether GPS PPP combined with this high-resolution GIM can get better positioning results. Experimental results show that under static calculation, GPS PPP combined any model, can’t reduce the positioning error. Under the simulation dynamic calculation, after combine CODE GIM, it can reduce about 10% positioning error in horizontal and vertical direction; after combine NCKU GIM, it can reduce about 10% and 6% positioning error in horizontal and vertical direction. In terms of convergence time, with the horizontal positioning error of 0.5 m and 0.3 m as the threshold, combined with either model, the convergence time can be shortened by 93.3% and 50%. The overall result shows that after combine NCKU GIM can get the similar result to the CODE GIM in horizontal direction, but after combine CODE GIM can get better performance in vertical direction.

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