載波相位觀測量在高精度的GPS動態定位扮演一個重要的角色。當決定了正確的整數週波值，單一時刻確實可達到公分等級的定位精度。本研究將聯合GPS及Galileo的三頻觀測量，利用LAMBDA (Least-squares AMBiguity Decorrelation Adjustment) 與CAR (Cascading Ambiguity Resolution) 兩種解算週波值的方法，分析GNSS單一時刻二次差分週波未定值解算效益。模擬24小時的觀測量，以進行短基線單一時刻週波值的解算。利用正確的週波值與估計的Ratio值作為成功解算週波值的依據，分析不同觀測條件下週波值的解算成果。研究成果顯示，當衛星遮蔽角達到30度且載波觀測量的精度為1公分時，LAMBDA法解算整數週波值完全正確的筆數可達99％以上，同時，通過Ratio值測試的筆數也有90％以上。而CAR法解算整數週波值受到觀測量精度與線性組合的影響，使得正確整數週波值的筆數銳減。因此未來GNSS單一時刻即時動態定位，使用LAMBDA法解算週波值將較CAR法更具測量應用上之優勢。

Carrier phase measurements play an important role on high precision GPS kinematic positioning. Once the integer ambiguities are determined correctly, it can be surely achieved centimeter-level positioning accuracy in one epoch. This study investigates GNSS single epoch double difference ambiguity resolution performance for combined GPS with Galileo triple-frequency measurements using both LAMBDA (Least-squares AMBiguity Decorrelation Adjustment) and CAR (Cascading Ambiguity Resolution) methods. Short baseline single epoch ambiguity resolution based on 24-h simulated data is taken into study. Ambiguity resolution has been successfully carried out using correct ambiguity and estimated Ratio value for the study result under different observation condition.The results show that the correct rate of epochs for resolving all triple-frequency ambiguities can be achieved up 99% by using LAMBDA method. It will come true when the mask angle is 30 degree and the precision of carrier phase is 1 cm. Meanwhile, the successful rate of epochs pass the Ratio test can be also achieved up 90%. However, the CAR method, influenced by measurement precision and linear combination, makes reduction in the correct epochs. Therefore, it trends towards that the LAMBDA method is superior to CAR method on future GNSS single-epoch real-time kinematic ambiguity resolution.

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