基于Matlab的北斗二代B1频点软件接收机研究与实现

发布时间：2018-10-13 11:53

【摘要】：全球卫星导航系统（GNSS）是航天大国的重要标志，是各国竞相发展的热门领域。北斗卫星导航系统（BDS）作为我国自主研发、完全独立运行的全球卫星导航系统，势必将应用于国家建设的各个领域，为广大人民群众带来巨大的社会和经济效益。因此，它具有较大的研究价值，也包括了系统重要组成中的接收机部分。传统接收机都是基于硬件实现的，其优点是运算速度快，缺点是算法固定、不易改变硬件、灵活性差。通过结合软件无线电技术，实现接收机的软件化设计，更好地弥补了传统硬件接收机的缺点。本文针对北斗二代B1频点信号进行了深入的研究，借助于Matlab仿真平台，实现了北斗二代B1频点软件接收机设计研究。首先，本文简要介绍了北斗二代B1频点信号的结构与特性。其次，说明了软件接收机射频前端数字中频数据处理和采集。然后，着重研究了B1I基带信号处理。在信号捕获过程中，本文采用等长补零的方法得到本地2ms伪码，通过与输入信号进行2ms相干累加积分，实现了B1I信号的精确捕获。在信号跟踪过程中，通过精细载波频率来缩小频率误差容限，并采用非相干延迟锁定环（DLL）和载波跟踪环（PLL）相结合的方式，实现了B1I信号的稳定跟踪输出。之后，，介绍了导航电文解调和定位解算的原理及相关知识。最后，采用上述方法对实际采集到的B1I信号数据在Matlab平台上进行软件算法验证，结果表明和实际用户坐标对比，北斗软件接收机解算出的用户所在位置坐标误差较小，具有良好的定位精度。
[Abstract]:Global satellite navigation system (GNSS) is an important symbol of a large spaceflight and a hot area for the development of various countries. Beidou Satellite Navigation system (BDS), as a global satellite navigation system independently developed and operated independently in China, is bound to be applied in various fields of national construction and bring huge social and economic benefits to the broad masses of the people. Therefore, it has great research value, and also includes the receiver part of the important components of the system. The traditional receiver is based on hardware, which has the advantages of fast operation speed, fixed algorithm, difficult to change the hardware, and poor flexibility. By combining the software radio technology, the software design of the receiver is realized, which makes up for the shortcomings of the traditional hardware receiver. In this paper, the Beidou second generation B1 frequency point signal is deeply studied, and the design of Beidou second generation B1 frequency point software receiver is realized with the help of Matlab simulation platform. Firstly, the structure and characteristics of Beidou second generation B1 signal are briefly introduced in this paper. Secondly, the software receiver RF front end digital if data processing and acquisition are explained. Then, the B 1 I baseband signal processing is studied. In the process of signal acquisition, the local 2ms pseudo-code is obtained by equal-length complement, and the accurate acquisition of B1I signal is realized by 2ms coherent accumulation integral with the input signal. In the signal tracking process, the frequency error tolerance is reduced by fine carrier frequency, and the stable tracking output of the B1I signal is realized by combining the incoherent delay locking loop (DLL) and the carrier tracking loop (PLL). Then, the principle and knowledge of navigation message demodulation and location resolution are introduced. Finally, the software algorithm of the B1I signal data collected on the Matlab platform is verified by the above method. The results show that compared with the actual user coordinates, the coordinate error of the B1I signal calculated by the Beidou software receiver is smaller than that of the actual user coordinates. Good positioning accuracy.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN96.1

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