多星座组合卫星导航系统仿真分析

发布时间：2018-02-02 10:09

本文关键词： GNSS BDS DOP 仿真组合导航　出处：《江西理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着现有的GPS、GLONASS系统的现代化，以及BDS、Galileo系统的建成，全球导航卫星系统将为未来测量技术带来新的发展。未来的全球导航卫星系统将为用户提供更多的卫星和信号，以满足越来越高的导航、定位需求。面对用户不断提高的需求，更小、更轻、更快、更环保的接收机就成为未来的发展趋势。但是对于越来越多的卫星信号和编码数量来说，就需要更加高效的处理技术。基于此，本文对多星座组合卫星导航系统的一些关键性问题展开研究。首先，四大全球卫星导航系统设计初衷都不尽相同，为了解这四个导航系统之间的差异。本文通过对四大导航系统星座的模拟仿真，对它们在不同高度截止角下中国四个地区以及全球范围内的可见卫星数、PDOP值和导航精度的统计数据进行分析，得出它们在不同情况下的导航性能数据，为用户提供参考。其次，本文通过组合多个导航系统来解决单系统导航性能不足的问题。而多系统的组合导航首先要解决的是数据解算时坐标系和时间系统统一的问题。在讨论四个全球卫星导航系统坐标和时间系统之间的不同之后，提出了将坐标系统统一到WGS-84坐标系，时间系统统一到国际原子时的解决办法。然后，为了解组合卫星导航系统的导航性能，本文将不同的导航卫星系统进行组合，模拟仿真了单星座，双星座，三星座、四星座的四个方案，通过仿真数据分析了它们在不同高度截止角下全球范围内的导航性能。最后，多星座的组合使得卫星数量大幅增加，同时也加大了数据处理的难度。在对大量的仿真数据以及前人成果的研究后，计算出在保证精度前提下的合适可见卫星数量。同时针对传统的选星算法效率比较低这一缺点，提出了改进的选星算法，大大提高了选星的速度，，并通过仿真来验证了优化算法的可行性。
[Abstract]:With the modernization of the existing GPS GLONASS system and the completion of the BDS Galileo system. GNSS will bring new development to the future measurement technology. The future GNSS will provide users with more satellites and signals to meet the increasing navigation. In the face of the increasing demand of users, smaller, lighter, faster and more environmentally friendly receivers will become the trend in the future. But for more and more satellite signals and coding quantity. Therefore, some key problems of multi-constellation integrated satellite navigation system are studied in this paper. First of all, the four major global satellite navigation system design intention is not the same, in order to understand the differences between the four navigation systems, this paper through the four navigation system constellation simulation. The statistical data of PDOP values and navigation accuracy of visible satellites in four regions of China and the whole world at different cutoff angles are analyzed and their navigation performance data under different conditions are obtained. Provide reference for users. Second. In this paper, the problem of insufficient navigation performance of single system is solved by integrating multiple navigation systems. The first problem of integrated navigation of multi-system is the unification of time coordinate system and time system. Four global problems are discussed in this paper. After the difference between the satellite navigation system coordinates and the time system. The solution of unifying the coordinate system to the WGS-84 coordinate system and the time system to the international atomic time is presented. Then, in order to understand the navigation performance of the integrated satellite navigation system, this paper combines different navigation satellite systems, and simulates the four schemes of single constellation, double constellation, Samsung constellation and four constellations. Their global navigation performance at different cutoff angles is analyzed by simulation data. Finally, the combination of multiple constellations greatly increases the number of satellites, but also increases the difficulty of data processing. At the same time, aiming at the low efficiency of traditional star selection algorithm, an improved star selection algorithm is proposed, which greatly improves the speed of star selection. The feasibility of the optimization algorithm is verified by simulation.
【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：P228.4

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