导航系统中自适应抗干扰算法的FPGA设计及实现

发布时间：2018-06-28 16:52

本文选题：GPS + 空时二维滤波　；参考：《电子科技大学》2013年硕士论文

【摘要】：最初作为辅助导航的工具而发展起来的全球卫星导航定位系统（GPS）现已在军用和民用领域得到了广泛的应用，但其在军事行动中暴露出的易受干扰的缺陷也备受关注。因精密制导武器优势的充分发挥要极大的依赖GPS系统的完整性和抗干扰能力，而若从GPS卫星星座出发提高系统抗干扰能力，则会造成硬件成本的上升和开发周期的延长。所以可从GPS接收机出发提高抗干扰能力，且基于软件的抗干扰设计由于其易于维护和成本较低的优点将会在更多领域得到应用。本文基于现有的GPS接收机的硬件资源，在其内部的一款Altera的芯片EP3C120F484上进行自适应抗干扰算法的设计。首先对纯空域和空时二维自适应滤波的基础理论进行介绍和仿真分析，可看出空时二维算法相对于纯空域算法具有明显的优势。而后从GPS接收机AD转换后数据的频谱特性和零中频数字信号的处理流程这两点出发，研究了具体的自适应抗干扰系统的整体框架。并针对整体模块的每个小模块进行详细的算法设计、Matlab浮点仿真和FPGA定点仿真。而整个GPS接收机的自适应抗干扰系统的核心部分就是自适应抗干扰算法的设计，考虑到芯片的资源情况，最后选择LMS自适应跟踪算法，而由于LMS算法的局限性从而引进了DLMS算法，并依据DLMS算法结构实现纯空域和空时二维信号的自适应滤波。最后，将本文设计好并用FPGA实现的GPS自适应抗干扰算法集成到整个GPS接收机系统，，并通过整个系统的室外抗干扰测试结果，进一步分析此自适应抗干扰系统的正确性和其性能的优劣。
[Abstract]:The Global Satellite Navigation and Positioning system (GPS), which was originally developed as a tool to assist navigation, has been widely used in military and civilian fields, but its vulnerability to interference in military operations has attracted much attention. Because the advantage of precision guidance weapon depends heavily on the integrity and anti-jamming ability of GPS system, if the anti-jamming ability is improved from GPS satellite constellation, the hardware cost will be increased and the development period will be prolonged. Therefore, the anti-jamming ability can be improved from GPS receiver, and the software based anti-jamming design will be applied in more fields because of its advantages of easy maintenance and low cost. Based on the hardware resources of the existing Altera receiver, this paper designs an adaptive anti-jamming algorithm on an Altera chip EP3C120F484. Firstly, the basic theory of pure spatial domain and space-time two-dimensional adaptive filtering is introduced and simulated. It can be seen that space-time two-dimensional algorithm has obvious advantages over pure spatial domain algorithm. Based on the spectrum characteristics of AD converted data and the processing flow of zero-if digital signal, the whole frame of adaptive anti-jamming system is studied. At the same time, the detailed algorithm design for each small module of the whole module is carried out, and Matlab floating-point simulation and FPGA fixed-point simulation are carried out. The core of the whole GPS receiver adaptive anti-jamming system is the design of adaptive anti-jamming algorithm. Considering the resource of the chip, the LMS adaptive tracking algorithm is selected. Due to the limitation of LMS algorithm, DLMS algorithm is introduced, and adaptive filtering of pure spatial and space-time signals is realized according to DLMS algorithm structure. Finally, the GPS adaptive anti-jamming algorithm implemented by FPGA is integrated into the whole GPS receiver system, and the outdoor anti-jamming test results of the whole system are given. The correctness and performance of the adaptive anti-jamming system are analyzed.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228.4

【共引文献】