BeiDou Navigation Satellite System is called BeiDou System for short, with the abbreviation as BDS. In China, BDS will be used as the primary navigation system for civil aviation, especially for the approach and landing operation, and marine application, especially for the entering harbor stage. BDS Satellite-based augmentation systems (SBAS) is ongoing. Different with the SBAS of GPS and GLONASS, BDS SBAS will operate using five GEO satellites of its constellation, instead of additional GEO satellites, such as PRN 120/124/126 of EGNOS and PRN 135/138. With BDS SBAS, BDS will provide global service meeting the Category I (CAT I) precise approach performance requirements. For CAT II/III precise approach, Groundbased augmentation systems (GBAS) is expected. There are some special areas in China whose coverage radius is more than 200km, and the performance requirement is intended to meet CAT II/III. So GBAS will not meet the requirement, because its coverage is only about 50km. For example, in Zhujiang Delta, china, five airports including Zhuhai airport, Shenzhen airport, Guangzhou airport, Hongkong airport, and Macao airport are distributed inside the area whose radius is about 200km. The similar case also could be found on Yangtze Delta, china. Therefore, Satellite Navigation Region Augmentation System (RAS) is proposed by National Key Laboratory of CNS/ATM, Beihang University. For RAS, multi-GBAS is distributed on a region whose radius is about 200km, and the airborne inside the region could use the information broadcasted by multi-GBAS. Also, one of the GBAS stations could use the information from SBAS GEO satellites and one or more other GBAS stations to improve its integrity, for example to monitor the ionospheric anomaly. In the paper, we will study on integrity risk allocation and fault mode of RAS Firstly. As follows, proposes an ionosphere storm monitor method for RAS. Then, analyze the position performance of RAS based on BDS mixed orbits. Finally, estimate the availability of BDS RAS.
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机译：北投导航卫星系统被称为Beidou系统短，缩写为BDS。在中国，BDS将被用作民用航空的主要导航系统，特别是对于方法和着陆运行，以及海洋应用，特别是进入港口阶段。 BDS卫星的增强系统（SBA）正在进行中。与GPS和GLONASS的SBA不同，BDS SBA将使用其星座的五个地理卫星进行操作，而不是额外的地理卫星，例如PRN 120/124/126的EGNOS和PRN 135/138。使用BDS SBAS，BDS将提供会议I（CAT I）的全球服务精确的方法性能要求。对于CAT II / III精确的方法，预计地面增强系统（GBA）是预期的。中国有一些特殊区域，其覆盖率半径超过200km，性能要求旨在满足CAT II / III。因此GBA不会符合要求，因为其覆盖率仅为50km。例如，在中国珠江三角洲，五个机场，包括珠海机场，深圳机场，广州机场，香港机场和澳门机场都分布在半径约为200公里的地区内。类似的案例也可以在中国长三角地区找到。因此，卫星导航区域增强系统（RAS）是由北京航空航天大学CNS / ATM的国家重点实验室，建议。对于RAS，多GBA分布在半径约为200km的区域上，并且该区域内的空气传播可以使用由多GBA广播的信息。而且，GBAS站之一可以使用来自SBAS Geo卫星的信息和一个或多个其他GBA站来改善其完整性，例如监测电离层异常。在论文中，我们将首先研究RAS的完整性风险分配和故障模式。如下，提出一种用于RAS的电离层风暴监测方法。然后，分析基于BDS混合轨道的RAS的位置性能。最后，估计BDS RA的可用性。
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