GNSS快速选星算法及测距码应用研究

发布时间：2018-02-01 20:47

本文关键词： GNSS导航系统选星算法星间测距　出处：《中国科学院大学(中国科学院国家空间科学中心)》2017年硕士论文　论文类型：学位论文

【摘要】：现阶段,航天技术迅速发展,多模系统组合导航接收机的应用越来越广泛。相比于单模接收机,GNSS(Global Navigation Satellite System)接收机在定位过程中的可见卫星数明显增多,如何在可见卫星中更快速有效的选取用于定位的卫星成为了GNSS接收机中的关键问题。此外,卫星群中各个小卫星之间需要相对位置信息,因此,独立、自主的小卫星之间的相对定位成为必然,而各个小卫星之间的高精度测距是相对定位的基础。本文的主要工作为:(1)介绍了GNSS导航系统的定位原理。对GNSS系统的组成部分进行概况,分析了GNSS信号结构与组成,说明了伪距观测量的提取方法。(2)从二维和三维两方面分析了卫星几何分布对接收机定位精度的影响。(3)鉴于当前广泛使用GPS导航服务,以及我国自主研发的北斗导航系统,文章提出了应用于该两种组合导航系统的快速选星算法。经过软件仿真以及接收机生成的实验数据,证明了此算法在组合导航系统中的可行性。(4)利用MATLAB仿真设计了小卫星之间的测距系统,并对得到的测距结果进行了分析。测距的实现原理是结合GNSS测距码,通过计算PRN码相位获得两卫星之间的距离。本课题研究了提高GNSS接收机实时性定位的方法,为GNSS接收机的研制及应用提供了方法。
[Abstract]:At present, with the rapid development of space technology, the integrated navigation receiver of multi-mode system is more and more widely used, compared with the single-mode receiver. The number of visible satellites in the positioning process of GNSS(Global Navigation Satellite system receiver is increasing obviously. How to select the satellites for positioning more quickly and effectively in visible satellites has become a key problem in GNSS receiver. In addition, the relative position information is needed among the small satellites in the satellite group, so it is independent. The relative positioning between autonomous small satellites becomes inevitable. The high precision ranging between each small satellite is the basis of relative positioning. The main work of this paper is to introduce the positioning principle of GNSS navigation system and the components of GNSS system. The structure and composition of GNSS signal are analyzed. This paper explains the method of extracting pseudo-range observation. (2) analyzing the influence of satellite geometry distribution on the positioning accuracy of receiver from two dimensions and three dimensions.) in view of the widespread use of GPS navigation service at present. As well as the Beidou navigation system developed by our country, this paper presents a fast star selection algorithm applied to the two integrated navigation systems, which is simulated by software and the experimental data generated by the receiver. The feasibility of this algorithm in the integrated navigation system is proved. The MATLAB simulation is used to design the ranging system between small satellites. The result of ranging is analyzed. The principle of ranging is based on GNSS code. The distance between the two satellites is obtained by calculating the phase of the PRN code. In this paper, the method of improving the real-time localization of the GNSS receiver is studied, which provides a method for the development and application of the GNSS receiver.
【学位授予单位】：中国科学院大学(中国科学院国家空间科学中心)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN967.1

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