星基增强系统电离层延迟改正完好性技术研究

项目名称： 星基增强系统电离层延迟改正完好性技术研究

项目编号： No.61401007

项目类型： 青年科学基金项目

立项/批准年度： 2015

项目学科： 电子学与信息系统

项目作者： 汪珊

作者单位： 北京大学

项目金额： 8万元

中文摘要： 全球导航系统应用于民用航空存在精度和完好性不足，星基增强系统（SBAS）作为其增强方式之一，可以提高广阔覆盖范围内民用航空用户的定位性能。然而，在影响定位的所有误差源中，电离层延迟误差是其中最大并且最难估计的部分，也是SBAS的关键技术环节。未来北斗全球导航系统势必要发展其星基增强技术，而目前国内对SBAS电离层延迟改正技术研究较为匮乏。因此，本课题拟研究北斗系统的SBAS电离层延迟改正及完好性监测方法。首先，分析并处理GPS基准站观测数据，得到中国上空的电离层延迟空间相关统计特性；其次，搭建北斗系统电离层延迟观测模型，仿真分析与研究电离层延迟改正的完好性监测算法，并评估算法性能。最后，仿真分析与研究多星座下电离层延迟改正和完好性监测方法，并评估算法性能。该课题的开展将为北斗系统星基增强技术的实施奠定理论与技术基础，为多卫星导航系统应用于我国民用航空带来光明前景。

中文关键词： 卫星导航；电离层延迟；完好性；星基增强系统；

英文摘要： The accuracy and integrity of Global Navigation Satellite System are insufficient when applying in civil aviation, as a way of enhancement, Satellite Base Augmentation System (SBAS) can improve the positioning performance of civil aviation users among wide area. However, ionospheric delay error is the largest error source as well as most difficult to estimate; also it is the key technology in SBAS. In the future, Beidou global navigation system will certainly develop its SBAS technology, while up to now the research on ionospheric delay correction technology of SBAS is deficient. Thus, this subject will research on the ionospheric delay correction technology and the integrity monitoring methods in SBAS of Beidou. Firstly, we will analyze and process the observation data from GPS reference station, and obtain the statistics spatial correlation of ionsopheric delay over China. Secondly, the model of ionospheric delay in Beidou system will be built, and the integrity monitoring algorithm of ionospheric delay correction will be analyzed and discussed through simulation, also the algorithm performance will be evaluated. Finally, the ionospheric delay correction and monitoring methods under multi-constellation will be analyzed and researched through simulation. The development of the subject will lay the foundation fo

英文关键词： satellite navigation；ionospheric delay；integrity；satellite based augmentation system；