非差增强信息与差分虚拟观测数据的等价变换理论

针对目前非差精密单点定位增强信息无法直接用于RTK(real time kinematic)相对定位的问题,研究了基于附加坐标约束的参考站非差精密单点模糊度固定解提取非差改正信息的方法,并建立了非差增强信息与虚拟参考站观测信息等价变换模型,重点论述了空间状态域信息(state space representation,SSR)在等价变换中的区别应用。根据RTK模糊度部分固定技术,利用实测数据设计实验证明了算法的正确性与可用性。结果表明,虚拟零基线可获得与网络RTK同等精度的定位效果,从而实现了区域增强系统在非差与差分模式上的高度统一。

Equivalence Transformation Theory from Zero-Difference PPP Augmentation Information to Virtual Observation Data for Differential Positioning

According to the issue that zero-difference precise point positioning(PPP) augmentation information cannot be directly applied to real-time kinematic(RTK) relative positioning, this paper studies the method of obtaining the zero-difference correction information with PPP ambiguity resolution based on additional coordinate constraint in the reference station, establishes the model of equivalence transformation from zero-difference augmentation information to virtual observation data, and focuses on difference application of state space representation information in equivalence transformation. Experiment designed with real GNSS observation data proves correctness and availability of algorithm according to RTK ambiguity with partial ambiguity fixing technology. The results show that virtual zero-baseline can deliver a good accuracy positioning as same as the network RTK, thereby enabling high unification of regional augmentation system in terms of zone-difference and difference modes.