北斗二代软件接收机关键技术研究
发布时间：2018-07-26 15:27
【摘要】：北斗卫星导航系统，简称北斗系统，英文缩写为BDS。北斗系统是我国自行研制开发的全球卫星定位通信系统。该系统除了可为各类用户提供精准可靠的定位，导航和授时服务外，它还独有短报文通信功能。北斗二代软件接收机具有硬件接收机无法比拟的优点，可以充分发挥软件的灵活性，为促进北斗导航算法研究，，加速北斗系统的发展奠定了基础。 本文主要对北斗二代的B1频点信号软件接收机的关键技术进行研究，主要内容包括对卫星信号的捕获跟踪以及后续的解码解算处理。在捕获跟踪部分，首先对多种捕获算法进行比较分析，利用码相位并行捕获和精细捕获相结合的方法实现了对北斗实际信号的捕获；然后介绍了信号的跟踪原理，对信号跟踪参数的设置进行了探索，选用最适当的参数对实际北斗信号进行了跟踪。在解码解算部分，进行了NH码解调和BCH校验，提出了两种不同的校验方法，在保证导航电文正确性的基础上，提取子帧内容，解算星历参数，得到定位结果。通过对定位结果和实际位置的比较，其误差在允许范围内，验证了算法的可行性。
[Abstract]:Beidou Satellite Navigation system, abbreviated as BDSs, is short for Beidou system. Beidou system is a global positioning communication system developed by our country. This system not only provides accurate and reliable positioning, navigation and time service for all kinds of users, but also has the function of short message communication. Beidou second generation software receiver has the advantage that the hardware receiver can not compare, can give full play to the flexibility of the software, and has laid the foundation for promoting the research of Beidou navigation algorithm and speeding up the development of Beidou system. In this paper, the key technology of the software receiver of Beidou second generation B1-frequency signal is studied. The main contents include the acquisition and tracking of satellite signal and the subsequent decoding processing. In the part of acquisition and tracking, several acquisition algorithms are compared and analyzed, and the method of code phase parallel acquisition and fine capture is used to realize the acquisition of Beidou actual signal, and then the principle of signal tracking is introduced. The setting of signal tracking parameters is explored and the most appropriate parameters are selected to track the actual Beidou signal. In the decoding part, NH code demodulation and BCH check are carried out, and two different checking methods are proposed. On the basis of ensuring the correctness of the navigation message, the contents of sub-frames are extracted, the ephemeris parameters are solved, and the location results are obtained. By comparing the location results with the actual position, the error is within the allowable range, and the feasibility of the algorithm is verified.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN965.5
本文编号：2146452
[Abstract]:Beidou Satellite Navigation system, abbreviated as BDSs, is short for Beidou system. Beidou system is a global positioning communication system developed by our country. This system not only provides accurate and reliable positioning, navigation and time service for all kinds of users, but also has the function of short message communication. Beidou second generation software receiver has the advantage that the hardware receiver can not compare, can give full play to the flexibility of the software, and has laid the foundation for promoting the research of Beidou navigation algorithm and speeding up the development of Beidou system. In this paper, the key technology of the software receiver of Beidou second generation B1-frequency signal is studied. The main contents include the acquisition and tracking of satellite signal and the subsequent decoding processing. In the part of acquisition and tracking, several acquisition algorithms are compared and analyzed, and the method of code phase parallel acquisition and fine capture is used to realize the acquisition of Beidou actual signal, and then the principle of signal tracking is introduced. The setting of signal tracking parameters is explored and the most appropriate parameters are selected to track the actual Beidou signal. In the decoding part, NH code demodulation and BCH check are carried out, and two different checking methods are proposed. On the basis of ensuring the correctness of the navigation message, the contents of sub-frames are extracted, the ephemeris parameters are solved, and the location results are obtained. By comparing the location results with the actual position, the error is within the allowable range, and the feasibility of the algorithm is verified.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN965.5
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