The key of measurement using GPS carrier phase is the determination of integer ambiguity. A method of QR decomposition is applied to decompose the observation matrix of satellites,so as to decrease dimensions of the matrix. Symmetry triangle decomposition is used to the searching of integer ambiguity because of Z transform may engender error. Simulation results indicate that the proposed method is fast and efficient for relative positioning of a moving user.%GPS初始整周模糊度的求解是利用载波相位进行测量时的关键问题，采用了对系数矩阵进行QR分解的方法，用以降低矩阵的维数。模糊度搜索时，针对Z变换可能会引入多余误差，采用了对称三角分解法对协方差矩阵进行去相关处理。实验与仿真结果表明，定位误差在0.5 cm以内，方位角和仰角误差在0.1°以内。
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