基于NS210-B的北斗卫星导航系统B1信号的研究

发布时间：2018-03-16 22:24

本文选题：北斗卫星导航系统　切入点：B1信号　出处：《南京理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：北斗卫星导航系统,是我国拥有自主知识产权、独立研制和开发建设的新一代卫星导航定位系统,英文缩写为BDS。我国的BDS、美国的GPS和俄罗斯的GLONASS都是军民两用的卫星导航系统,而欧洲的Galileo系统主要用于民用,它们均受到世界各国的广泛关注,被称作当今世界的四大卫星导航系统。无论是在国民经济领域还是在军事领域,北斗卫星导航系统都将扮演十分重要的角色,体现出巨大的价值。在整个卫星系统中,相对空间段和地面控制段来讲,用户段在功能上有较好的可扩展性,在设计上有较高的灵活性。因此,越来越多的学者和专家把精力投入到对卫星接收机的研究中。北斗系统的B1频段包含着民用信号的频段,因此,研究B1频段的信号对研究民用接收机有非常重要的意义。本文以MEO/IGSO卫星的B1频段信号为例,研究了接收机从接收到的卫星信号得出用户位置的过程。结合Matlab软件,着重介绍和分析了北斗卫星信号处理过程中的一些关键环节。首先分析和研究了三种典型的捕获方法。然后提出用4ms数据长度的并行码相位搜索来捕获卫星信号,这样做兼顾了捕获效率和捕获可靠性。本文根据北斗卫星D1导航电文自身的特点,探讨并完成了NH码的解码工作。在分析D1导航电文的详细编排后,深入研究了BCH纠错编码和在系统中的应用,发现其纠错能力仅为1bit。即长度为11比特的一组信息中,如果错误码元个数在两个或两个以上,本纠错方法无法实现纠错的功能。最后,将NS210-B的中频采样信号通过上述数据处理方法,解算出了卫星的各个星历参数。经检验,各星历参数均在其正确的取值范围内,并且通过计算得出14号卫星离地面的距离约为21160km,这与MEO卫星轨道的高度21528km很接近,验证了本课题中原理与方法的正确性。又以基本的单点定位法为例,研究了北斗卫星导航系统的伪距定位过程。并提出了一种改进的单点定位法,只需要知道各卫星到接收机天线的相对伪距和卫星坐标,而不需要知道绝对伪距,就能计算出用户的位置。
[Abstract]:Beidou satellite navigation system is a new generation of satellite navigation and positioning system, which has its own intellectual property rights and is independently developed and developed in China. BDSs of our country, GPS of the United States and GLONASS of Russia are both dual-use satellite navigation systems. The Galileo systems in Europe are mainly used for civilian use. They are widely concerned by all countries in the world, and are called the four major satellite navigation systems in the world today, whether in the field of national economy or in the military field. Beidou satellite navigation system will play a very important role, reflecting great value. In the whole satellite system, compared with the space segment and the ground control section, the user segment has better function expansibility. Because of the high flexibility in design, more and more scholars and experts focus on the research of satellite receiver. The B1-band of Beidou system contains the frequency band of civil signal. Therefore, it is very important to study the B1-band signal in the B1-band. This paper takes the B1-band signal of MEO/IGSO satellite as an example. The process of the receiver getting the user's position from the received satellite signal is studied. Combined with Matlab software, This paper mainly introduces and analyzes some key links in the signal processing of Beidou satellite. Firstly, three typical acquisition methods are analyzed and studied. Then, a parallel code phase search of 4ms data length is proposed to capture satellite signals. In this paper, according to the characteristics of Beidou satellite D1 navigation message, the decoding of NH code is discussed and completed. After analyzing the detailed arrangement of D1 navigation message, The BCH error correction coding and its application in the system are deeply studied. It is found that the error correction ability is only 1 bit. that is, in a group of information with 11 bits in length, if the number of error symbols is two or more, the error correction method cannot achieve the function of error correction. Finally, through the above data processing method, the if sampling signal of NS210-B is used to calculate the satellite's ephemeris parameters. The results show that all the ephemeris parameters are in the range of their correct values. The distance from the ground to the ground is 21160 km, which is very close to the altitude of MEO satellite orbit (21528km), which verifies the correctness of the principle and method in this project, and takes the basic single point positioning method as an example. In this paper, the pseudo-range positioning process of Beidou satellite navigation system is studied, and an improved single-point positioning method is proposed, which only needs to know the relative pseudo-range and satellite coordinates of each satellite to the antenna of the receiver, but not the absolute pseudo-range. The user's location can be calculated.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN96.1

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