【摘要】：隨著全球?qū)Ш叫l(wèi)星系統(tǒng)(Global Navigation Satellite System,GNSS)的發(fā)展,GNSS高精度的定位和導航性能得到廣泛的應用特別是軍事方面,如無人機、作戰(zhàn)艦艇、潛艇以及巡航導彈和彈道導彈等,因此針對全球?qū)Ш较到y(tǒng)的相關導航對抗技術引起了許多國家的關注。目前對導航對抗技術的研究主要集中在對導航定位信號進行干擾,從而破壞其定位導航功能。本文就是對導航對抗技術-轉發(fā)式欺騙干擾中的信道模擬器進行了研究與實現(xiàn)。本文在對當前導航對抗技術以及信道模擬技術充分調(diào)研和總結分析的基礎上,并針對現(xiàn)有導航對抗技術研究的偏理論、可實施性差,以及研究主要集中于移動通信領域等問題,提出通過改變導航信號的相應的信道特性來實現(xiàn)轉發(fā)式欺騙干擾。通過對導航信號結構、定位原理以及信道特性對導航信號的影響等方面的研究和分析,建立了產(chǎn)生轉發(fā)式欺騙干擾的干擾模型,并根據(jù)模型中信道模擬器的功能要求,提出了信道模擬器的總體實現(xiàn)方案。提供了信道模擬器的信道特性模擬實現(xiàn)算法、信道模擬器信號處理模塊以及信道模擬器的控制軟件的詳細設計過程�？紤]到接收頻率的非線性特性,采用三階DDS對載波多普勒進行動態(tài)模擬實現(xiàn)。并利用FPGA芯片作為信道模擬器的信號處理模塊,對中頻導航信號進行多普勒頻移、延時等信道特性模擬實現(xiàn),同時采用信道模擬器控制軟件以參數(shù)形式對其進行實時控制。最后,在完成對信道模擬器的整體設計實現(xiàn)之后,對其進行了性能測試,驗證其信道特性模擬效果。其中包括了對不同通道輸出的同步性、相對延時、多普勒頻偏測試以及該信道模擬器的整體功能測試。測試結果表明,本文設計實現(xiàn)的信道模擬器能正確模擬導航信號的相對延時及多普勒頻移等信道特性,并成功產(chǎn)生欺騙信號,實現(xiàn)轉發(fā)式欺騙干擾。
[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.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN967.1

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