摘要
星基增强系统(SBAS)是在传统GNSS的基础上为了进一步满足民航用户对卫星导航系统越来越高的精度、完好性、连续性和可用性需求而应运而生。目前全球已建立起了多个SBAS系统,其中提供服务时间最长的是美国的WAAS系统。WAAS系统包括38个参考站、3个主控站、6个上注站和3颗GEO卫星,每个参考站配备3套独立的监测接收机。首先介绍了WAAS的系统结构,通过比对WAAS不同GEO卫星播发的各类型电文数据的异同,分析其电文播发的一致性及用户使用不同GEO播发电文对服务的影响,并对最低运行性能标准里针对用户选择WAAS不同GEO卫星信号的规范和约束条件进行了合理性分析。通过对比目前成熟的广域差分系统架构和播发方式,从应用需求角度揭示了SBAS系统与传统广域差分系统实现的本质区别,指出完好性实时监测的基础是必须建立足够可靠的地面监测网络和卫星通信链路。
Satellite based augmentation system(SBAS) is built on the basis of traditional GNSS in order to further improve accuracy, integrity, continuity and availability. At present, many SBASs have been established around the world. Among them, the system which provides the longest service is the WAAS of the United States. WAAS has 38 reference stations, 3 master stations, 6 ground uplink stations and 3 GEO satellites. In order to guarantee system redundancy, each WRS has three independent receivers. The system structure of WAAS was introduced, and the similarities and differences of different types of message data transmitted by different GEO satellites in WAAS were compared. The consistency of message broadcasting and the impact on users due to different GEO broadcast messages were analysed. Also, the specifications and constraints of WAAS on user selection of SBAS signals in minimum operational performance standards were analysed. The essential difference between SBAS and traditional wide-area difference system was revealed from the perspective of applying requirements, and it was pointed out that integrity real-time monitoring is based on establishing a sufficiently reliable ground monitoring network and satellite communication link.
作者
王启舟
李锐
张晶灿
张超
WANG Qizhou;LI Rui;ZHANG Jingcan;ZHANG Chao(School of Electronics and Information Engineering,Beihang University,Beijing 100191,China;Technical Centre of Air Traffic Management,Bureau of CACC,Beijing 100015,China)
出处
《中国空间科学技术》
CSCD
北大核心
2022年第2期30-38,共9页
Chinese Space Science and Technology
基金
国家重点研发计划(2020YFB0505602)。
