發(fā)布時(shí)間：2018-04-22 14:11

  本文選題：可編程邏輯器件 + 軟件無(wú)線電　； 參考：《東華理工大學(xué)》2017年碩士論文

【摘要】：隨著國(guó)際海洋運(yùn)輸行業(yè)的快速發(fā)展,海洋運(yùn)輸行業(yè)對(duì)海上通信設(shè)備提出了更高的要求。為滿足設(shè)備要求,需要采用新的技術(shù)實(shí)現(xiàn)手段。軟件無(wú)線電技術(shù)作為通信技術(shù)的未來(lái)發(fā)展方向,其理論的發(fā)展和應(yīng)用為海上通信設(shè)備的研制提供了一種更加高效的技術(shù)實(shí)現(xiàn)途徑。以FPGA為代表的可編程邏輯器件的快速發(fā)展,為軟件無(wú)線電技術(shù)提供了更好的實(shí)現(xiàn)平臺(tái)。FPGA可編程器件的出現(xiàn)使得軟件無(wú)線電技術(shù)的靈活性和開(kāi)放性擴(kuò)展到系統(tǒng)硬件設(shè)計(jì)級(jí)別。本文詳細(xì)介紹了NAVTEX系統(tǒng)的發(fā)展現(xiàn)狀并對(duì)國(guó)內(nèi)外NAVTEX系統(tǒng)的技術(shù)實(shí)現(xiàn)方案進(jìn)行了分析。在此基礎(chǔ)上提出了采用軟件無(wú)線電技術(shù)實(shí)現(xiàn)的基于FPGA的NAVTEX系統(tǒng)數(shù)字下變頻系統(tǒng)的設(shè)計(jì),用以替代通用的基于專用硬件設(shè)計(jì)的下變頻系統(tǒng)。本文對(duì)數(shù)字下變頻系統(tǒng)的整體方案進(jìn)行設(shè)計(jì)并對(duì)系統(tǒng)中的數(shù)控振蕩器、積分梳狀濾波器、有限單位脈沖響應(yīng)濾波器、正交解調(diào)模塊進(jìn)行了理論分析和介紹。根據(jù)系統(tǒng)功能要求對(duì)數(shù)字下變頻系統(tǒng)各組成部分進(jìn)行了詳細(xì)的理論分析以及具體的設(shè)計(jì)過(guò)程。利用Simulink仿真軟件對(duì)設(shè)計(jì)的系統(tǒng)進(jìn)行整體系統(tǒng)模型和簡(jiǎn)化系統(tǒng)模型的建模以驗(yàn)證算法的正確性。根據(jù)系統(tǒng)理論設(shè)計(jì)在FPGA平臺(tái)上對(duì)各組成部分進(jìn)行硬件實(shí)現(xiàn)。利用modelsim軟件對(duì)各個(gè)組成模塊進(jìn)行功能仿真并對(duì)部分仿真結(jié)果進(jìn)行MATLAB分析。最后,在FPGA平臺(tái)上對(duì)數(shù)字下變頻系統(tǒng)進(jìn)行整體實(shí)現(xiàn),通過(guò)在實(shí)驗(yàn)室搭建硬件測(cè)試平臺(tái)對(duì)數(shù)字下變頻系統(tǒng)的各項(xiàng)性能進(jìn)行測(cè)試。通過(guò)對(duì)數(shù)字下變頻系統(tǒng)的硬件測(cè)試表明系統(tǒng)能夠?qū)崿F(xiàn)對(duì)518KHZ的中頻調(diào)制信號(hào)進(jìn)行正確的解調(diào)且各項(xiàng)性能測(cè)試條件下系統(tǒng)對(duì)中頻信號(hào)的解調(diào)輸出誤碼率低于4%,符合國(guó)際標(biāo)準(zhǔn)對(duì)NAVTEX系統(tǒng)的性能要求。同時(shí),系統(tǒng)可以進(jìn)行在線升級(jí)和功能擴(kuò)展,極大的增加了系統(tǒng)的設(shè)計(jì)的靈活性和可擴(kuò)展性。
[Abstract]:With the rapid development of the international marine transportation industry, the marine transportation industry has put forward higher requirements for the marine communications equipment. In order to meet the requirements of the equipment, the new technology is needed to implement the technology. The software radio technology is the future development direction of the communication technology. The development and Application of its theory provide one of the development of maritime communication equipment. A more efficient approach to technical implementation. The rapid development of programmable logic devices, represented by FPGA, provides a better implementation platform for software radio technology, the emergence of.FPGA programmable devices, which extends the flexibility and openness of software radio to the system hardware design level. This paper introduces the NAVTEX system in detail. The development status and the technical implementation of the NAVTEX system at home and abroad are analyzed. On this basis, the design of the FPGA based NAVTEX system digital down conversion system based on the software radio technology is proposed to replace the general-purpose down conversion system based on the special hardware design. This paper is the whole side of the digital down conversion system. The case is designed and the numerical control oscillator, the integrated comb filter, the finite unit pulse response filter and the orthogonal demodulation module are analyzed and introduced. According to the function requirements of the system, the detailed analysis of the components of the digital down conversion system and the specific design process are carried out. The Simulink simulation software is used. The whole system model and simplified system model are modeled to verify the correctness of the algorithm. Based on the system theory, the hardware implementation of each component is carried out on the FPGA platform. The function simulation of each module is simulated with the Modelsim software and the MATLAB analysis is carried out for some of the real results. Finally, the FPGA level is flat. On the platform, the digital down conversion system is realized, and the performance of the digital down conversion system is tested by building the hardware test platform in the laboratory. The hardware test of the digital down conversion system shows that the system can realize the positive demodulation of the 518KHZ intermediate frequency modulation signal and the system under various performance testing conditions. The error rate of the demodulation output of the intermediate frequency signal is less than 4%, which is in line with the performance requirements of the international standard for NAVTEX system. At the same time, the system can upgrade and expand the function online, which greatly increases the flexibility and extensibility of the system design.

【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN773

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