基于北斗卫星的星基增强系统完好性关键技术研究

发布时间：2018-06-12 12:39

本文选题：北斗 + SBAS　；参考：《沈阳航空航天大学》2017年硕士论文

【摘要】：GNSS在当今世界的经济和军事领域中起着不可或缺的作用,世界各强国已相继建设了自己的GNSS系统。国际民航组织(ICAO)针对民用航空的需要,提出了导航系统的所需导航性能(RNP),体现在精度、完好性、连续性和可用性四个方面。为满足民用航空的性能需求,世界各国纷纷发展自己的星基增强系统(SBAS),以期为广域范围内的用户提供精度更高、完好性更强的导航服务。针对我国建设日益成熟的北斗卫星导航系统,有必要研究发展我国自主的星基增强系统,为我国及周边领域民用航空用户提供更高质量的导航服务。本文首先对北斗卫星导航系统进行了说明,介绍了坐标系统和时间系统,并对北斗导航电文进行了研究和分析。随后对RINEX格式的北斗导航电文文件和观测值文件的结构做出了说明,给出了利用星历参数计算卫星空间位置坐标的算法。其次对星基增强系统的原理进行了阐述,描述了系统组成和数据处理过程。重点介绍了几项误差处理算法,包括电离层延迟、对流层延迟、卫星钟差、星历误差的修正算法。对比分析了格网电离层模型和Klobuchar模型校正电离层延迟的结果,证明格网电离层模型的校正结果优于Klobuchar模型。最后介绍了北斗星基增强系统完好性监测的过程,并对其中的关键技术进行了研究,包括完好性参数UDRE、RURA和GIVE的算法介绍。并根据中国大陆构造环境监测网络(Cmonoc)提供的GNSS观测数据进行了仿真分析,结果证明UDRE和RURA的误差分析结果可以应用于航路导航直至终端进近阶段,而GIVE的误差分析结果不够理想,是选取的参考站数目过少,导致相应的格网电离层模型建立得不够精确所致。
[Abstract]:GNSS plays an indispensable role in the economic and military fields of today's world. Every powerful country in the world has built its own GNSS system one after another. Aiming at the needs of civil aviation, the International Civil Aviation Organization (ICAO) puts forward the required navigation performance of the navigation system, which is embodied in four aspects: accuracy, completeness, continuity and availability. In order to meet the performance requirements of civil aviation, countries all over the world have developed their own space-based augmentation system (SBASA), in order to provide a more accurate and perfect navigation service for wide-area users. In view of the increasingly mature Beidou satellite navigation system in China, it is necessary to study and develop our own satellite based augmentation system to provide higher quality navigation services for civil aviation users in China and its surrounding areas. In this paper, the Beidou satellite navigation system is introduced, the coordinate system and time system are introduced, and the Beidou navigation message is studied and analyzed. Then, the structure of Beidou navigation message file and observation value file in RINEX format is explained, and the algorithm of calculating satellite space position coordinate by using ephemeris parameters is given. Secondly, the principle of space-based enhancement system is described, and the system composition and data processing process are described. Several error processing algorithms are introduced, including ionospheric delay, tropospheric delay, satellite clock error and ephemeris error correction algorithm. The results of correction of ionospheric delay by grid ionospheric model and Klobuchar model are compared and analyzed. It is proved that the correction result of grid ionospheric model is superior to that of Klobuchar model. Finally, the process of monitoring the integrity of the system is introduced, and the key technologies are studied, including the algorithms of UDRERURA and live. Based on the GNSS observation data provided by Cmonoca, the result shows that the error analysis results of UDRE and RURA can be used in navigation until the terminal approach. The error analysis result of GIVE is not ideal, because the number of reference stations selected is too small, resulting in the establishment of the corresponding grid ionospheric model is not accurate enough.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN967.1

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