北斗星基增强系统的精确性研究

Research on the Accuracy of Beidou Satellite-Based Augmentation System

介绍北斗卫星导航系统的现状以及北斗卫星星基增强系统的工作原理。研究影响卫星导航精度定位的主要来源,确定有3种误差源,分别为卫星钟差、对流层延迟误差、电离层延迟误差。在此之后,对影响定位精度最主要的误差源——电离层延迟进行分析。针对电离层误差提出格网电离层模型的优化算法并通过数据采集和算法仿真对比得到较好的优化模型。通过仿真结果对比证明了优化算法能够有效降低电离层误差值。

Introduces the development status of Beidou satellite navigation system and the working principle of Beidou satellite-based augmentation system.The main sources that affect the positioning accuracy of satellite navigation were studied,which can be divided into the following three categories:errors related to satellite clock,errors related to apostrophe delay,and errors related to ionospheric delay.After this,the ionospheric delay that is the most important source of error affecting positioning accuracy is analyzed.Aiming at the ionospheric error,an optimization algorithm for the grid ionospheric model is proposed,and a better optimization model is obtained through data acquisition and algorithm simulation comparison.The comparison of simulation results proves that the optimized algorithm can effectively reduce the ionospheric error value.