一种变形监测中中长基线的单历元模糊度解算算法

针对已有单历元模糊度解算算法只适用于短基线的情形，根据误差传播率确定模糊度精度，依据误差确定模糊度搜索空间，提出一种利用GPS双频观测信息实现中长基线下单历元模糊度固定的算法。首先，利用电离层约束法得到双差模糊度之间的线性约束条件；其次，利用变形监测中监测站点坐标近似已知的条件进行约束，反算获得近似模糊度；最后，根据监测站点已有的观测数据精度给出搜索空间，搜索固定模糊度。结果表明，该方法可以实现中长基线下单历元的模糊度固定，对实时变形监测有一定的参考价值。

A Single Epoch Ambiguity Algorithm for Medium and Long Baseline in Deformation Monitoring

To compensate for the current existing single-epoch algorithm to resolve ambiguity, which is only suitable for short baselines, we propose an algorithm with dual-frequency GPS observations to achieve medium and long baseline single-epoch ambiguity fixed according to the error propagation rate. Then, the ambiguity search space is determined according to the accuracy. Firstly, the linear constraint condition between the double-difference ambiguities is obtained by the ionospheric constraint method. Secondly, the approximate coordinates of the monitoring station in the deformation monitoring are used to obtain the approximate ambiguity. Finally, the search space is obtained according to the accuracy of the observational data, and then we search for and fix the ambiguity. The experimental results show that the method can fix the ambiguity of single epoch under medium and long baseline, and it has certain reference value for real-time deformation monitoring.