海上环境动态阈值模糊度检验方法

Dynamic critical value ambiguity test method for marine environment

针对传统模糊度检验方法难以完全适应海上环境下接收机时刻处于运动状态、多路径效应较严重导致卫星信号易失锁,卫星可变性增强等问题,该文根据GNSS模型强度和成功率/失败率指标来动态确定模糊度检验阈值,利用蒙特卡洛积分建立模糊度阈值速查表,实现动态模糊度检验方法的实时应用,改善了海上环境下传统ratio-test阈值确定多基于经验、缺少理论基础的问题。海上实测数据的实验结果表明,动态模糊度检验有效提高了整周模糊度固定率,提高了基线解的整体精度,在海上环境下相较于传统ratio-test有着更优的表现。

The traditional ambiguity test method is difficult to fully adapt to the problems that the receiver is in motion at any time,and the serious multipath effect causes the satellite signal to lose lock,and the satellite variability is enhanced in the marine environment.In this paper,a dynamic ambiguity test method was proposed to determine the ambiguity test threshold according to the strength of the satellite model.The Monte Carlo integration was used to establish a quick look-up table for the ambiguity threshold to realize the real-time application of the dynamic ambiguity test method and solve the traditional problem.The fixed critical value ratio-test was mostly based on experience and lacks theoretical basis.Experimental results based on the measured data at sea showed that dynamic ambiguity test could effectively improve the integer ambiguity fixation rate,and improve the overall accuracy of the baseline solution.Compared with the traditional ratio-test had better performance.