导航对抗中信道模拟器的研究与实现

发布时间：2019-02-26 21:48

【摘要】：随着全球导航卫星系统(Global Navigation Satellite System,GNSS)的发展,GNSS高精度的定位和导航性能得到广泛的应用特别是军事方面,如无人机、作战舰艇、潜艇以及巡航导弹和弹道导弹等,因此针对全球导航系统的相关导航对抗技术引起了许多国家的关注。目前对导航对抗技术的研究主要集中在对导航定位信号进行干扰,从而破坏其定位导航功能。本文就是对导航对抗技术-转发式欺骗干扰中的信道模拟器进行了研究与实现。本文在对当前导航对抗技术以及信道模拟技术充分调研和总结分析的基础上,并针对现有导航对抗技术研究的偏理论、可实施性差,以及研究主要集中于移动通信领域等问题,提出通过改变导航信号的相应的信道特性来实现转发式欺骗干扰。通过对导航信号结构、定位原理以及信道特性对导航信号的影响等方面的研究和分析,建立了产生转发式欺骗干扰的干扰模型,并根据模型中信道模拟器的功能要求,提出了信道模拟器的总体实现方案。提供了信道模拟器的信道特性模拟实现算法、信道模拟器信号处理模块以及信道模拟器的控制软件的详细设计过程。考虑到接收频率的非线性特性,采用三阶DDS对载波多普勒进行动态模拟实现。并利用FPGA芯片作为信道模拟器的信号处理模块,对中频导航信号进行多普勒频移、延时等信道特性模拟实现,同时采用信道模拟器控制软件以参数形式对其进行实时控制。最后,在完成对信道模拟器的整体设计实现之后,对其进行了性能测试,验证其信道特性模拟效果。其中包括了对不同通道输出的同步性、相对延时、多普勒频偏测试以及该信道模拟器的整体功能测试。测试结果表明,本文设计实现的信道模拟器能正确模拟导航信号的相对延时及多普勒频移等信道特性,并成功产生欺骗信号,实现转发式欺骗干扰。
[Abstract]:With the development of (Global Navigation Satellite System,GNSS (Global Navigation Satellite system), the high-precision positioning and navigation performance of GNSS has been widely used, especially in military aspects, such as unmanned aerial vehicles, combat vessels, submarines, cruise missiles and ballistic missiles, etc. Therefore, the navigation countermeasure technology related to the global navigation system has aroused the attention of many countries. At present, the research of navigation countermeasure technology is mainly focused on jamming the navigation positioning signal, thus destroying its positioning and navigation function. In this paper, the channel simulator in the technique of navigation countermeasure-repeater spoofing jamming is studied and realized. Based on the full investigation and analysis of the current navigation countermeasure technology and channel simulation technology, this paper focuses on the problems of partial theory, poor implementation, and mainly focused on the field of mobile communication, for the existing navigation countermeasure technology research, such as partial theory, poor implementation, and so on. This paper proposes to realize repeater deception jamming by changing the corresponding channel characteristics of navigation signals. Based on the research and analysis of navigation signal structure, positioning principle and the influence of channel characteristics on navigation signal, a jamming model is established, and according to the functional requirements of channel simulator in the model, a jamming model is established. The overall implementation scheme of the channel simulator is proposed. The simulation algorithm of channel characteristics, the signal processing module of channel simulator and the control software of channel simulator are provided in detail. Considering the nonlinear characteristics of the receiving frequency, the third-order DDS is used to simulate the carrier Doppler. The FPGA chip is used as the signal processing module of the channel simulator to simulate the channel characteristics of if navigation signal such as Doppler frequency shift delay and so on. At the same time the channel simulator control software is used to control it in real time in the form of parameters. Finally, after the overall design and implementation of the channel simulator, the performance test is carried out to verify the simulation effect of the channel characteristics. It includes synchronization of different channel output, relative delay, Doppler frequency offset test and the overall function test of the channel simulator. The test results show that the channel simulator designed in this paper can correctly simulate the channel characteristics such as relative delay and Doppler frequency shift of navigation signals, and successfully generate deceptive signals to achieve repeatable deception jamming.
【学位授予单位】：湘潭大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN967.1

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