卫星导航信号捕获算法的研究和实现

发布时间：2018-04-16 14:34

本文选题：接收机 + 导航信号捕获　；参考：《中北大学》2014年硕士论文

【摘要】：伪随机码的捕获方法是扩频通信系统中的关键技术之一，伴随着扩频技术的不断发展以及新型导航信号的不断出现，伪随机码捕获技术也在不断的改进。对伪随机码的同步捕获算法研究，国内外研究学者从未间断过。本文主要研究卫星导航信号的捕获算法，着重研究提高导航信号捕获算法性能的一些关键技术环节，并对PMF-FFT捕获算法原理进行分析，在此基础上针对本论文的技术要求进行捕获算法设计，最后在FPGA内实现所设计的捕获算法，并在接收机平台上进行实测。首先，对开展本论文研究的背景进行描述，明确了文章的研究意义，确定了论文的研究方向。在分析扩频通信技术理论的基础上，阐述了BPSK信号调制方式以及BOC信号调制方式，并分别介绍了这两种调制方式的信号性能。其次，详细阐述了导航信号捕获的原理，对一些影响捕获模块性能的关键技术如捕获灵敏度的提高、多普勒频移的影响等进行了研究。简单介绍了几种常用的捕获算法，按照本论文的技术要求选取了性能较好的PMF-FFT捕获方法进行了理论上的分析，对该方法的重要特性进行了数学上的推导，针对技术要求对北斗信号和GPS信号捕获算法进行了详细设计，，并在Matlab环境下对此捕获算法进行了仿真，同时对BOC信号的捕获方法进行了分析和研究。最后，根据本文分析设计的PMF-FFT捕获算法，依托于高速发展的FPGA数字技术，在兼顾捕获时间和资源的基础上对捕获模块进行了设计，在DSP-FPGA接收机平台上利用VerilogHDL语言对算法进行实现，并详细介绍了载波生成、伪码生部分、部分匹配滤波器等关键环节FPGA的实现方法。最后利用接收机平台进行实测，验证了所设计并实现的捕获模块的可用性。
[Abstract]:The acquisition method of pseudorandom code is one of the key technologies in spread spectrum communication system. With the continuous development of spread spectrum technology and the emergence of new navigation signals, pseudorandom code acquisition technology is constantly improved.The research on the synchronization acquisition algorithm of pseudorandom codes has never been interrupted by domestic and foreign researchers.In this paper, the acquisition algorithm of satellite navigation signal is studied, and some key technologies to improve the performance of navigation signal acquisition algorithm are studied, and the principle of PMF-FFT acquisition algorithm is analyzed.On this basis, the acquisition algorithm is designed according to the technical requirements of this paper. Finally, the designed acquisition algorithm is implemented in FPGA and measured on the platform of the receiver.Firstly, the background of this paper is described, the significance of the research is clarified, and the research direction is determined.On the basis of analyzing the theory of spread spectrum communication technology, the modulation mode of BPSK signal and the modulation mode of BOC signal are expounded, and the signal performance of these two modulation modes are introduced respectively.Secondly, the principle of navigation signal acquisition is described in detail, and some key technologies that affect the performance of acquisition module, such as the improvement of acquisition sensitivity and the influence of Doppler frequency shift, are studied.In this paper, several commonly used acquisition algorithms are briefly introduced. According to the technical requirements of this paper, the PMF-FFT capture method with better performance is selected for theoretical analysis, and the important characteristics of the method are derived mathematically.The Beidou signal and GPS signal acquisition algorithm is designed in detail according to the technical requirements, and the acquisition algorithm is simulated under the Matlab environment. At the same time, the acquisition method of the BOC signal is analyzed and studied.Finally, according to the analysis and design of the PMF-FFT acquisition algorithm in this paper, based on the high-speed FPGA digital technology, the capture module is designed on the basis of both the acquisition time and the resource.The algorithm is implemented on the platform of DSP-FPGA receiver using VerilogHDL language. The implementation methods of FPGA, such as carrier generation, pseudo code generation, partial matched filter, are introduced in detail.Finally, the availability of the acquisition module is verified by using the receiver platform.
【学位授予单位】：中北大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN96.1

【引证文献】