BDS软件接收机基带信号处理技术研究

发布时间：2019-06-20 07:33

【摘要】：北斗卫星导航系统(BeiDou Navigation Satellite System,简称BDS),是由中国自主研发的提供全球定位、导航和授时服务的卫星导航系统。自1996年美国颁布E911法令以来,基于位置服务(Location Based Service,LBS)的概念走入了人们的生活,市场上出现了各种嵌入导航模块的终端产品,并根据定位信息推出了相关应用服务,给人们的生活带来了便捷。本文研究了BDS软件接收机基带信号处理问题,改进了北斗系统信号捕获算法。同时,利用多核并行处理技术实现了信号并行跟踪。通过并行处理优化了BDS软件接收机的性能,为研究具有多模多频处理能力的实时软件接收机提供了相关的理论和技术支持。本文的主要工作包括以下几个方面：(1)采用C#语言构建了BDS软件接收机实现平台,其功能包括BDS信号仿真、信号捕获、信号跟踪、位置解算以及数据的解调等。(2)针对BlI信号中NH码跳变问题,在并行捕获的基础上提出改进的并行捕获算法,并对改进的算法进行了仿真测试,实验结果表明改进的算法可以有效规避由NH码和导航数据引起的跳变对相关结果的影响,提高了算法的可靠性及适用性,GEO卫星和MEO/IGSO卫星的捕获成功率分别从62%、83%提高到98%左右。(3)针对软件接收机跟踪时延大的问题,本文基于C#语言提出了一种B1I信号跟踪处理方案,采用多核并行处理技术实现多通道并行跟踪,从而提高软件接收机的处理速度,降低时延。仿真结果显示,本文提出方案的加速比超过了1.5,有效地缩短了信号的跟踪时长。
[Abstract]:Beidou satellite navigation system (BeiDou Navigation Satellite System,) is a satellite navigation system developed by China to provide global positioning, navigation and timing services. Since the promulgation of E911 in 1996 in the United States, the concept of location-based service (Location Based Service,LBS) has entered people's lives, and a variety of terminal products embedded in navigation modules have appeared in the market, and related application services have been launched according to positioning information, which has brought convenience to people's lives. In this paper, the baseband signal processing of BDS software receiver is studied, and the signal acquisition algorithm of Beidou system is improved. At the same time, the multi-core parallel processing technology is used to realize the parallel signal tracking. The performance of BDS software receiver is optimized by parallel processing, which provides relevant theoretical and technical support for the research of real-time software receiver with multi-mode and multi-frequency processing ability. The main work of this paper includes the following aspects: (1) the implementation platform of BDS software receiver is constructed with C # language, its functions include BDS signal simulation, signal acquisition, signal tracking, position solution and data demodulation. (2) aiming at the problem of NH code jump in BlI signal, an improved parallel acquisition algorithm is proposed on the basis of parallel acquisition, and the improved algorithm is simulated and tested. The experimental results show that the improved algorithm can effectively avoid the influence of jump caused by NH code and navigation data on the related results, and improve the reliability and applicability of the algorithm. The acquisition success rates of GEO satellite and MEO/IGSO satellite are increased from 62% and 83% to 98% respectively. (3) in order to solve the problem of large tracking delay of software receiver, a B1I signal tracking processing scheme based on C # language is proposed in this paper. Multi-core parallel processing technology is used to realize multi-channel parallel tracking, so as to improve the processing speed of software receiver and reduce the delay. The simulation results show that the acceleration ratio of the proposed scheme is more than 1.5, which effectively shortens the tracking time of the signal.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN911.7;TN965.5

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