北斗导航卫星系统定位性能与参数分析

发布时间：2018-01-28 22:03

本文关键词： 北斗卫星导航系统实测数据精度因子选星组合性能指标　出处：《中国民航大学》2014年硕士论文　论文类型：学位论文

【摘要】：卫星系统性能监测与评估是系统发展建设必不可少的步骤。中国实施北斗卫星导航系统“三步走”战略,通过星座设计、空间信号质量及服务性能指标建设来实现各阶段平稳过渡。以实测数据为基础分析北斗系统性能参数对现阶段的区域系统和将来面向全球化覆盖系统建设具有现实的指导意义。基于实测数据对一周内各卫星可见性进行统计和对比分析,研究了可见性较差的卫星的规律。为北斗单星服务性能评估提供依据。对比北斗系统与GPS在连续一周内水平定位精度和垂直定位精度。不仅对北斗系统定位质量有了长期数据统计的研究同时通过与GPS的对比,反映出北斗系统在定位精度以及精度稳定性上的不足,对北斗系统后续建设与系统升级提供改进方向上的参考。在分析总结了各种精度因子模型后,基于连续一周实测数据对北斗系统与GPS精度因子进行对比研究。同时证明北斗系统精度因子达到甚至优于北斗性能规范中可用性指标。在研究GDOP特性基础上基于GDOP进行最优选星组合,提出采用进入最优选星组合次数来评价单星区域导航定位质量。基于GDOP门限值提出次优选星组合,为用户终端定位提供备用选星,提升服务连续性。在已知卫星相对于接收机的仰角、方位角及轨道高度情况下,提出利用迁移算法得出卫星相对于任意地点的仰角和方位角,从而解得特定卫星组合在任意地点的GDOP值。基于该算法,理论上可进行较大区域内的GDOP值分布分析。对比了广播星历与精密星历差值,反映出广播星历准确性。研究了北斗系统目前已有的信号层及服务层连续性及部分可用性指标,基于长期实测数据进行指标验证。
[Abstract]:Performance monitoring and evaluation of satellite systems is an essential step in system development and construction. China has implemented the "three-step" strategy of Beidou satellite navigation system through constellation design. The performance parameters of Beidou system are analyzed based on the measured data, which are helpful to the construction of the regional system and the globalization-oriented coverage system in the future. Based on the measured data, the visibility of each satellite within a week is statistically analyzed and compared. The regularity of satellite with poor visibility is studied, which provides the basis for evaluating the service performance of Beidou single satellite. The horizontal and vertical positioning accuracy of Beidou system and GPS are compared within a continuous week. Not only the positioning accuracy of Beidou system is not only for Beidou system. The quality of the long-term data with statistical research was also compared with GPS. It reflects the lack of positioning accuracy and accuracy stability of Beidou system, and provides a reference for the further construction and upgrade of Beidou system. After analyzing and summing up various precision factor models. The accuracy factor of Beidou system is compared with that of GPS based on the measured data for one consecutive week. It is also proved that the accuracy factor of Beidou system reaches or is superior to the usability index of Beidou performance specification. Based on GDOP, the optimal combination of star selection is carried out. This paper proposes to use the optimal number of star selection to evaluate the quality of single-star regional navigation and positioning. Based on the GDOP threshold, the sub-optimal combination is proposed to provide backup satellite selection for user terminal positioning. When the elevation azimuth and orbital altitude of the satellite relative to the receiver are known a migration algorithm is proposed to obtain the elevation and azimuth of the satellite relative to any location. Based on this algorithm, the distribution of GDOP values in large regions can be analyzed theoretically, and the difference between broadcast ephemeris and precise ephemeris is compared. Reflecting the accuracy of broadcast ephemeris, the continuity and partial availability indexes of signal layer and service layer in Beidou system are studied, and the indexes are verified based on long-term measured data.
【学位授予单位】：中国民航大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN967.1

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