基于可靠性指标的Ratio检验模糊度质量方法

Ambiguity validation with Ratio test based on reliability index

整周模糊度估值的可靠性对保障卫星导航定位精度有着至关重要作用,本文针对常规Ratio检验模糊度方法中阈值c难以确定问题,基于模糊度成功率检验理论分析了Ratio检验法的概率特性,推导了模糊度失败率与Ratio检验阈值间的函数关系式,实现利用给定可靠性指标——模糊度失败率确定Ratio检验阈值c,从而保证模糊度固定解的可靠性。算例表明,该方法可解决Ratio检验中阈值c动态取值的关键问题,具有一定的实际意义。

Ambiguity validation is very important to positioning precision of satellite navigation. According to the difficulty in choosing the c value in Ratio test for ambiguity validation, a method was proposed in the paper. Firstly, the probability characteristic of Ratio test was analyzed based on the theory of success rate ; and then the functional relationship between the fixed failure rate and c val- ue was deduced so as to determine the c value and ensure the ambiguity validation. Experiment showed that this method could solve the key problem of Ratio test and have some applicable value.