双差法
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double-differenced carrier phase 载波相位双差
double differenced carrier phase 伪距增量
GPS double-differenced carrier phase observables GPS载波相位双差观测量
Such a system is discussed in this paper, and the corresponding error model and measurement model, especially double-differenced GPS carrier phase model are set up.
针对全组合系统进行了研究，建立了相应的误差模型和系统观测模型，特别是组合系统下的GPS载波相位双差观测模型。
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