double difference phase observation 双差相位观测 在卫星定位中，两站对两颗卫星所作的单差相位观测值之差。
GPS姿态测量通常采用双差载波相位观测量，因此整周模糊值解算成为GPS实时姿态测量的关键问题。
Integer ambiguity resolution is the key problem of GPS based real-time attitude determination system which use double differencing carrier phase observables.
对单个历元的双差载波相位观测方程进行零空间变换，避免了实时变化的三维位置参数求解；
It transforms the double-differential carrier observation equation using null space transformation so that it need not to resolve real-time three-dimensional position parameters.
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。
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.
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