非差精密单点定位收敛判定方法研究

Research on convergence determining method in zero-differenced precise point positioning

针对非差实时精密单点定位应用中,如何判定定位精度是否达到用户应用需求的问题,该文提出了一种基于位置、对流层湿分量、模糊度参数时间序列,综合分析非差精密单点定位是否收敛的新方法。该方法给出了收敛精度判定参数P值的定义与经验阈值,通过计算获取P值,判定定位结果是否收敛。通过实测数据分析对该文方法进行实验验证,结果表明:P值首次达到0.5以上时,三维定位收敛精度优于15 cm的判定成功率达到55%,优于25 cm的判定成功率达到75%以上;P值首次达到0.9以上时,三维定位收敛精度优于15 cm的判定成功率达到75%以上,优于25 cm的判定成功率达到92%。

Aiming at the problem that in the application of real-time zero differential precise point positioning,it is hard and important to determine whether the positioning accuracy can meet the user’s requirements.This article proposed a new convergence determining method based on the comprehensive analysis on the time series of coordinates,tropospheric wet component and ambiguities.This method gave the definition and empirical threshold of value P.It could determine whether the positioning results converge by using the P value.The feasibility of the method was validated by a large amount of real observed data,the results showed that:when value P firstly passed 0.5,the success rate of 15 cm three-dimensional positioning accuracies of convergence could reach 55%,the success rate of 25 cm was better than 75%;when the value P passed 0.9,the success rate of 15 cm three-dimensional positioning accuracies could reach 75%;the success rate of 25 cm achieved 92%.