短波非實時數(shù)據(jù)傳輸系統(tǒng)的設(shè)計與實現(xiàn)
發(fā)布時間：2019-01-20 10:18
【摘要】：短波通信具有機動靈活、抗毀性好等優(yōu)點,一直是軍事通信大力發(fā)展的通信技術(shù)。但由于傳統(tǒng)短波通信功能單一、可擴展性差,已難以適應(yīng)現(xiàn)代通信的數(shù)字化、網(wǎng)絡(luò)化、寬帶化等需求。在短波通信中引入軟件無線電思想,可以很好地解決這一困境,對提高短波通信質(zhì)量具有十分重要的意義。數(shù)字調(diào)制解調(diào)技術(shù)是短波通信中的一個關(guān)鍵技術(shù),也是軟件無線電研究的重點,本文基于數(shù)字化調(diào)制解調(diào)技術(shù)實現(xiàn)了一個短波非實時數(shù)據(jù)傳輸系統(tǒng)。首先,在數(shù)據(jù)發(fā)送部分基于Visual C++編譯環(huán)境用C語言開發(fā)了 PC報文發(fā)送控制軟件。并設(shè)計實現(xiàn)了上位機PC與下位機基帶調(diào)制模塊間信息交互的通信協(xié)議。然后,完成了基于DSP芯片的下位機軟件無線電基帶信號調(diào)制電路,設(shè)計了電路原理圖及PCB線路圖,并完成了硬件電路的制板、焊接與調(diào)試。在DSP的專用編譯環(huán)境CCS3.3中用C語言與匯編語言聯(lián)合開發(fā)了 4FTSK(四時四頻)調(diào)制程序以及其它電路子模塊程序。其中,報文發(fā)送控制軟件包括數(shù)據(jù)交織模塊、編碼模塊、格式組裝模塊及串口通信模塊。報文發(fā)送控制軟件完成了對原始報文數(shù)據(jù)的編碼(Golay)、交織、分集處理等功能,然后將其組裝成本文所設(shè)計的五層數(shù)據(jù)結(jié)構(gòu)格式,以實現(xiàn)數(shù)據(jù)三重分集功能。基帶調(diào)制端由串口通信模塊、4FTSK調(diào)制模塊、數(shù)模轉(zhuǎn)換模塊、調(diào)制信號平衡輸出模塊及子模塊組成,基于直接數(shù)字頻率合成原理實現(xiàn)了基帶信號的4FTSK調(diào)制功能。根據(jù)4FTSK調(diào)制最佳接收原理,開發(fā)了數(shù)據(jù)解調(diào)譯碼軟件。該軟件完成了對存儲音頻信息的解調(diào)譯碼。軟件解調(diào)部分包括采樣率變換模塊、匹配濾波模塊、低通濾波模塊、似然判決模塊及其子模塊。譯碼部分包括解交織模塊、位同步處理模塊、幀同步處理模塊、分集合并模塊、Chase算法軟糾錯模塊。最后,在實驗室測試了數(shù)據(jù)傳輸系統(tǒng)各部分的工作性能,并對系統(tǒng)進行數(shù)據(jù)的實際收發(fā)測試。實驗結(jié)果表明,系統(tǒng)的性能達到了項目設(shè)計的指標(biāo)要求。
[Abstract]:HF communication has the advantages of flexible flexibility and good survivability. It has been a communication technology developed vigorously in military communications. However, because of the single function and poor expansibility of traditional shortwave communication, it is difficult to meet the needs of modern communication such as digitalization, networking, broadband and so on. The introduction of the idea of software radio in HF communication can solve this dilemma well, and it is of great significance to improve the quality of HF communication. Digital modulation and demodulation is one of the key technologies in HF communication, and it is also the focus of software radio research. In this paper, a short-wave non-real-time data transmission system based on digital modulation and demodulation is implemented. Firstly, in the data sending part, the PC message sending control software is developed in C language based on Visual C compiler environment. The communication protocol between PC and baseband modulation module is designed and implemented. Then, the base-band signal modulation circuit of software radio based on DSP chip is completed, the circuit schematic diagram and PCB circuit diagram are designed, and the board making, welding and debugging of the hardware circuit are completed. The 4FTSK (04:00 quad-frequency) modulation program and other circuit submodule programs are developed in CCS3.3, a special compiling environment of DSP, using C language and assembly language. The message sending control software includes data interleaving module, coding module, format assembly module and serial communication module. The packet sending control software completes the functions of encoding (Golay), interleaving and diversity processing of the original message data, and then assembles it into the five-layer data structure format designed in this paper to realize the function of triple data diversity. The baseband modulation is composed of serial communication module, 4FTSK modulation module, digital-analog conversion module, modulation signal balance output module and sub-module. The 4FTSK modulation function of baseband signal is realized based on the principle of direct digital frequency synthesis. According to the optimal receiving principle of 4FTSK modulation, the software of data demodulation and decoding is developed. The software completes demodulation and decoding of stored audio information. The software demodulation includes sampling rate transform module, matched filter module, low pass filter module, likelihood decision module and its sub-module. The decoding part includes deinterleaving module, bit synchronization processing module, frame synchronization processing module, diversity merging module and Chase soft error correction module. Finally, the performance of each part of the data transmission system is tested in the laboratory. The experimental results show that the performance of the system meets the requirements of the project design.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN919.6;TN925
[Abstract]:HF communication has the advantages of flexible flexibility and good survivability. It has been a communication technology developed vigorously in military communications. However, because of the single function and poor expansibility of traditional shortwave communication, it is difficult to meet the needs of modern communication such as digitalization, networking, broadband and so on. The introduction of the idea of software radio in HF communication can solve this dilemma well, and it is of great significance to improve the quality of HF communication. Digital modulation and demodulation is one of the key technologies in HF communication, and it is also the focus of software radio research. In this paper, a short-wave non-real-time data transmission system based on digital modulation and demodulation is implemented. Firstly, in the data sending part, the PC message sending control software is developed in C language based on Visual C compiler environment. The communication protocol between PC and baseband modulation module is designed and implemented. Then, the base-band signal modulation circuit of software radio based on DSP chip is completed, the circuit schematic diagram and PCB circuit diagram are designed, and the board making, welding and debugging of the hardware circuit are completed. The 4FTSK (04:00 quad-frequency) modulation program and other circuit submodule programs are developed in CCS3.3, a special compiling environment of DSP, using C language and assembly language. The message sending control software includes data interleaving module, coding module, format assembly module and serial communication module. The packet sending control software completes the functions of encoding (Golay), interleaving and diversity processing of the original message data, and then assembles it into the five-layer data structure format designed in this paper to realize the function of triple data diversity. The baseband modulation is composed of serial communication module, 4FTSK modulation module, digital-analog conversion module, modulation signal balance output module and sub-module. The 4FTSK modulation function of baseband signal is realized based on the principle of direct digital frequency synthesis. According to the optimal receiving principle of 4FTSK modulation, the software of data demodulation and decoding is developed. The software completes demodulation and decoding of stored audio information. The software demodulation includes sampling rate transform module, matched filter module, low pass filter module, likelihood decision module and its sub-module. The decoding part includes deinterleaving module, bit synchronization processing module, frame synchronization processing module, diversity merging module and Chase soft error correction module. Finally, the performance of each part of the data transmission system is tested in the laboratory. The experimental results show that the performance of the system meets the requirements of the project design.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN919.6;TN925
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