卫星导航系统性能评估方法研究

发布时间：2018-03-02 19:19

本文选题：GNSS　切入点：完好性　出处：《沈阳航空航天大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着GPS等全球卫星导航系统的发展,一些区域导航和增强系统也在飞速发展。导航系统的不断发展带动了用户对其性能的关注,使得导航系统的性能优劣已经成为GNSS应用领域内各卫星导航系统竞争的关键。本文对GPS和BDS的空间信号(SIS)性能进行评估。首先针对目前精度评估模型存在的计算量大、评估条件受限等缺点,提出了分段式SIS用户测距误差(URE)评估模型和基于Allan方差法的SIS用户测速误差(URRE)、用户测加速度误差(URAE)评估模型,并利用广播星历和精密星历评估了GPS和BDS的SIS精度性能。在此基础上利用Q-Q图对GPS SIS URE的正态分布特性进行了拟合,验证了GPS SIS完好性评估的前提,并基于瞬时SIS URE的实测结果对GPS SIS URE的完好性进行了评估。其次,基于可靠性原理建立了SIS连续性评估模型,利用平均故障时间间隔(MTBF)表征了系统在单位时间内不发生连续性损失的概率。此外,针对目前可用性评估模型的不全面性,本文建立了一种基于马尔科夫过程的单星可用性评估模型,并在此基础上提出一种同时考虑卫星的故障率、修复率和备份情况的星座可用性评估模型。通过对实测数据进行统计分析,分别计算了GPS和BDS的连续性和可用性概率。本文基于实测数据和提出的评估模型,分别对GPS和BDS的精度、完好性、连续性和可用性进行了评估,评估结果验证了本文所提出的评估模型的有效性和两个系统的性能对其各自的SIS性能指标的符合性。同时,本文对卫星导航系统性能评估方法的研究对我国BDS的全球化建设和后续发展有十分重要的意义。
[Abstract]:With the development of GPS and other global satellite navigation systems, some regional navigation and enhancement systems are also developing rapidly. The performance of navigation system has become the key to the competition of satellite navigation system in the field of GNSS application. In this paper, the spatial signal of GPS and BDS is evaluated. This paper presents a segmented SIS user ranging error evaluation model and a SIS user speed measurement error evaluation model based on Allan variance method. The SIS accuracy performance of GPS and BDS is evaluated by using broadcast ephemeris and precise ephemeris. On the basis of this, the normal distribution characteristics of GPS SIS URE are fitted by Q-Q diagram, and the premise of GPS SIS integrity evaluation is verified. The integrity of GPS SIS URE is evaluated based on the measured results of instantaneous SIS URE. Secondly, the SIS continuity evaluation model is established based on the reliability principle. The probability of no continuity loss per unit time is characterized by the mean time interval MTBF. In addition, in view of the incompleteness of the current usability evaluation model, In this paper, a single satellite availability evaluation model based on Markov process is established, and a failure rate considering satellite is proposed. Based on the statistical analysis of the measured data, the continuity and availability probability of GPS and BDS are calculated. Based on the measured data and the proposed evaluation model, the continuity and availability probability of the constellation are calculated. The accuracy, completeness, continuity and availability of GPS and BDS are evaluated respectively. The evaluation results verify the validity of the proposed evaluation model and the conformity of the performance of the two systems to their respective SIS performance indexes. In this paper, the research on the performance evaluation method of satellite navigation system is of great significance to the global construction and subsequent development of BDS in China.
【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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