市面上的GPS接收器大部分都由晶片硬體進行展頻訊號接收所需之相關器運算，此法雖具有處理訊號速度快與所花費時間短之優點，但缺點在於硬體架構對某些功能較侷限且擴充性不佳。本文利用軟體撰寫方式取代硬體部分實現GPS軟體接收器。優點在於容易修改、擴充性大、延展性高及重建容易。若要以正確的頻率和相位即時產生載波訊號及展頻電碼，則花費時間過長，在此利用建表，將表格先存放在記憶體中，則可縮短執行時間。本論文中實現一種載波追蹤迴路的方法，相對於純粹鎖相迴路與鎖頻迴路而言有較小的平均誤差和誤差變異量，並且文中也探討此三種方法的差異性及對GPS軟體接收器的影響。

The software receiver realizes the correlation and navigation functions using software, making it easier to adopt advanced algorithms or process schemes. However, in a software receiver in receiving and processing GPS signals, the generation of carrier and code is very time consuming. In the thesis, the software receiver generates the C/A code and carrier on the grid of frequencies off-line. During the correlation process, the code and carrier are obtained through a look up table. The thesis investigates the processing of correlation and tracking of GPS signal based on stored code and carrier in a GPS software receiver. In comparison with phase lock loop and frequency lock loop, the proposed FLL/PLL tracking algorithm results in a smaller mean error and variance than PLL and FLL

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