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全球定位接收機都卜勒頻移之載具定位法研究

Vehicle Positioning Method Design by GPS Doppler Frequency Shift Signal

摘要


本研究提出以都卜勒頻移,做爲汽車導航方程式之解算基礎,並依此觀念推導由衛星量測資訊,所聯立的導航方程式。最後再使用最小平方差法運算,以求得接收機的位置及本地振盪信號的頻率。本研究是在GPS Build-2接收機上開發軟體程式,並以Nortel STR-2760標準衛星信號產生器,所產生的多重路徑微波信號,來檢測研發出來的定位精度改善效果。由測試結果可知以四顆衛星的都卜勒定位法,可用於載具的定位,精度爲1公尺,但需2秒一筆資料,速率較傳統方法慢。

並列摘要


This research used the GPS Build-2 receiver to obtain the doppler frequency shifts of satellites first, and then sets up the simultaneous navigation equations. Finally, solves the receiver position coordinates as well as the local oscillator frequency by the least-squared-error method. The results obtained by using the Nortel STR-2760 GPS simulator, showed that the positioning accuracy is about one meter with four satellites' information. Therefore, the proposed positioning method is efficient for the vehicle navigation despite in heavy multi-path environments.

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