The relative positioning precision based on GPS carrier-phase measuring can achieve minimeter level. Also, the high precision can be obtained in measuring direction with it. This paper introduces firstly the theory of Positioning and Orientating using double-difference carrier-phase and the transformation coordinate system. Secondly the baseline vector is calculated using least-squares method. Finally, algorithms for fast solving Integer ambiguity are analyzed in detail especially. After tests repeatedly, its directional precision is 2.0mil.
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