西北工业大学明德学院本科毕业设计论文
ABSTRACT
The emergence of the satellite navigation system is a landmark on the navigation
technology leap, with the rapid popularization of in various fields, embodied in the interference problem is increasingly apparent. In strong interference environment, the spread spectrum gain can't to suppress interference when need to use a variety of anti-jamming methods. Satellite navigation system in the interference environment for the strength of the interference suppression ability has become the key to whether can play a role. Therefore, the study of satellite system interference suppression technology, the development and application of satellite navigation system has important theoretical significance and application value.
This topic according to actual needs, using overlapping and window FFT algorithm to narrowband interference are studied, through MATLAB simulation diagram overlap add window FFT algorithms for narrowband interference suppression scheme is feasible, finally simulation under continuous wave narrowband interference by MATLAB simulation results show that the overlapping and window FFT algorithm has ability to resist dry letter than > - 70 db. Its performance in the main (1) study the narrow-band interference signal model (2) understand the GPS structure at the receiving end (3) the overlapping and window FFT algorithm and MATLAB simulation (4) the L1 frequency narrowband anti-jamming processing module and the MATLAB simulation.
This paper introduced the development history of GPS, the composition and working principle of GPS, satellite navigation system interference suppression of a variety of methods to study overlapping window FFT algorithm description and L1 frequency narrowband anti-jamming processing module and the MATLAB simulation research, reveals the characteristics of the GPS narrowband interference, and has important research significance.
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西北工业大学明德学院本科毕业设计论文
Key words: GPS, narrowband interference, overlapping and window FFT algorithm
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西北工业大学明德学院本科毕业设计论文
目 录
第一章 绪论................................................................................................................ 1
1.1 卫星导航的简介.............................................................................................. 1
1.1.1 GPS系统 ................................................................................................ 1 1.1.2 GLONASS系统 ..................................................................................... 3 1.1.3 Galileo系统 ............................................................................................ 3 1.1.4 北斗二号卫星导航系统........................................................................ 4 1.2 研究工作的背景及意义.................................................................................. 4 1.3 本文的章节安排.............................................................................................. 5 第二章 卫星导航系统干扰抑制技术........................................................................ 7
2.1 有源干扰抑制技术.......................................................................................... 8 2.2 多径干扰抑制技术........................................................................................ 12 2.3 选择可用性抑制技术.................................................................................... 13 2.4 当前抗干扰技术的主要问题........................................................................ 13 第三章 MATLAB软件简介 .................................................................................... 15
3.1 MATLAB软件简介 ....................................................................................... 15 3.2 MATLAB功能介绍 ....................................................................................... 16 第四章 GPS窄带抗干扰 ......................................................................................... 17
4.1 窄带干扰信号模型........................................................................................ 17
4.1.1 音频干扰.............................................................................................. 17 4.1.2 窄带AR干扰模型 .............................................................................. 18 4.1.3 低速数字干扰...................................................................................... 19 4.2 GPS接收端的结构 ........................................................................................ 21 4.3 重叠加窗FFT算法说明及MATLAB仿真 ................................................ 22 4.4 L1频点窄带抗干扰处理模块及MATLAB仿真 ........................................ 27
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西北工业大学明德学院本科毕业设计论文
4.5 本章小结........................................................................................................ 34 第五章 全文总结...................................................................................................... 35
5.1 总结................................................................................................................ 35 5.2 总结与展望.................................................................................................... 35 参考文献...................................................................................................................... 36 致 谢............................................................................................................................ 38 毕业设计小结.............................................................................................................. 39 附 录............................................................................................................................ 40
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