商業型GPS便宜有效，已經大量用於日常生活器件上。DGPS可提供更精確的定位效果，也已經演變為成熟的應用。如何將商業行GPS模組用於DGPS操作上，是值得探討的問題。本文探討利用便宜的商業型GPS模組來執行即時DGPS的功能。利用成大航太系校正參考點IAA7，本研究規劃及執行三種不同的實驗來驗證這個構想在定位上的可用性。研究中規劃以同一個模組的GPS與DGPS功能進行不同的實驗、透過3G、GPRS、有線網路、無線網路等來傳送數據，測試它的效果，交叉比較他們所發揮的功能特性。本文所建立的實驗法，可配合不同使用目的適當調整DGPS修正功能，因此具備多元化使用參考價值。

Commercial GPS receivers are cheap to be widely applied in livelihood devices at present. Differential GPS for better accuracy has been proved into mature utilization. How can a commercial GPS module be used in DGP performance is a practical question to study. In this thesis, an investigation on commercial GPS for real time DGPS is performed using different cheap GPS modules. By referring to a calibrated position on IAA7, three kinds of experiment are planned and carried to prove the effectiveness of differential operation of positioning. Experiments to compare different GPS modules in GPS and DGPS modes using different communication means for data transmission via 3G, GPRS, Internet and wireless Internet are scheduled and tested to check cross relations on all affecting parameters. The experiment method of this thesis can collect different purpose to adjust the DGPS setting so the experiment method possesses diversifications.

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