星间单差精密单点定位部分模糊度固定方法

Fixed method of PPP partial ambiguity based on single difference between satellites

针对传统的精密单点定位(PPP)技术由于收敛速度慢、获取高精度位置信息所需时间较长而无法满足用户对于快速高精度定位的需求的问题,该文采用了单差小数周偏差(FCB)产品固定模糊度的方法,以及部分模糊度固定的固定策略,来达到最优化使用固定解的PPP。通过对测站的数据的静态和仿动态实验分析验证,结果表明,进行部分模糊度固定的固定解定位精度要优于使用模糊度浮点解进行PPP得到的实数解的定位精度,收敛速度也有提升;而且相比于全模糊度固定策略,部分模糊度固定策略可以提升模糊度的历元固定率,使更多的固定模糊度的卫星可以参与定位,提升了定位的精度和收敛速度。

Aiming at the problem that the traditional precision point positioning(PPP)technology cannot meet the needs of users for fast and high-precision positioning due to the slow convergence speed and the long time required to obtain high-precision position information,this paper adopts the method of ambiguity resolution of single difference fractional cycle biases(FCB)products and the fixed strategy of partial ambiguity resolution to achieve the optimal PPP using fixed solutions.Through the static and imitation dynamic experimental analysis and verification of the data of the measuring station,the result shows,the positioning accuracy of the fixed solution with partial ambiguity resolution is better than the positioning accuracy of the real solution obtained by using the ambiguity floating solution for PPP,and the convergence speed is also improved;moreover,compared to the full ambiguity resolution strategy,the partial ambiguity resolution strategy can increase the epoch resolution rate of the ambiguity,so that more satellites with a fixed ambiguity can participate in positioning,which improves the accuracy and convergence speed of positioning.