【摘要】：鄰近空間鏈路是深空通信行星網(wǎng)的重要組成部分,鄰近空間無線收發(fā)系統(tǒng)的研究與設計對于鄰近空間通信與深空通信網(wǎng)絡的發(fā)展,以及我國對深空收發(fā)機的研究具有重要意義。本文在研究一般數(shù)字收發(fā)系統(tǒng)架構的基礎上,依據(jù)CCSDS制定的鄰近空間鏈路協(xié)議,結合鄰近空間通信環(huán)境的特點,研究并設計實現(xiàn)了一套基于FPGA、DSP數(shù)字信號處理平臺的鄰近空間數(shù)字收發(fā)系統(tǒng)。研究與設計中,既包含了對經典的數(shù)字通信理論的分析,又兼顧了鄰近空間通信鏈路協(xié)議的應用以及工程實現(xiàn)的創(chuàng)新。首先,在結合鄰近空間通信系統(tǒng)要求的前提下,對整個系統(tǒng)方案與通信流程進行合理化設計,分別給出了發(fā)射機與接收機詳細的理論推導、參數(shù)分析與設計過程。其次,通過仿真對比,分析了傳統(tǒng)Costas環(huán)載波同步的原理,在分析相干解調原理引入相位模糊的基礎上,結合鄰近空間的通信流程和經典的鑒相方法,提出了利用分階段鑒相實現(xiàn)無相位模糊的載波同步方法。通過仿真對比了查表映射法鑒相和CORDIC算法鑒相的性能優(yōu)劣,給出了高效的無相位模糊的載波同步設計方案與實現(xiàn)電路的仿真結果。然后,依據(jù)常規(guī)的早遲門符號同步理論,結合仿真結果,提出了避免不穩(wěn)定采樣點的創(chuàng)新型設計方法,給出了完整的實現(xiàn)過程。同時基于經典的Gardner環(huán)定時同步理論,進行了設計與實現(xiàn),結合實際的硬件系統(tǒng),對比了改進型早遲門與Gardner環(huán)符號同步的性能。此外,利用巧妙的組合邏輯設計,對幀同步與提取電路進行了設計與實現(xiàn),給出了設計過程和仿真結果。最后,本文對整個鄰近空間數(shù)字收發(fā)系統(tǒng)進行了聯(lián)合仿真,并結合硬件平臺設計了系統(tǒng)化的測試環(huán)境。分別對發(fā)射機的輸出信號以及數(shù)字接收中各個功能模塊中的關鍵信號進行了觀測,驗證了本系統(tǒng)設計的正確性,滿足了鄰近空間通信協(xié)議的要求。
[Abstract]:The adjacent space link is an important part of the deep space communication planetary network. The research and design of the adjacent space wireless transceiver system is of great significance to the development of the adjacent space communication and deep space communication network, as well as the research on the deep space transceiver in our country. Based on the study of the architecture of the general digital transceiver system, this paper is based on the CCSDS system A set of adjacent space digital transceiver system based on FPGA and DSP digital signal processing platform is designed and designed, which includes the analysis of the classical digital communication theory and the application of the adjacent space communication link protocol. First, in the premise of combining the requirements of the adjacent space communication system, the whole system scheme and the communication process are rationalized, and the detailed theoretical derivation of the transmitter and receiver, the parameter analysis and the design process are given. Secondly, the principle of the traditional Costas ring carrier synchronization is analyzed by the imitation of the true contrast. On the basis of the analysis of coherent demodulation principle introducing phase ambiguity, combining the communication flow of adjacent space and the classical phase detection method, a phase ambiguity carrier synchronization method is proposed by phased phase discrimination. The performance of phase detection and CORDIC algorithm is compared by simulation, and an efficient non phase mode is given. The carrier synchronization design scheme and the simulation result of the realization circuit. Then, based on the conventional early sign synchronization theory and the simulation results, an innovative design method to avoid the unstable sampling points is proposed, and the complete implementation process is given. Based on the classic Gardner ring timing synchronization theory, the design and Implementation are carried out. With the actual hardware system, the performance of the symbol synchronization between the improved early late gate and the Gardner ring is compared. In addition, the design and implementation of the frame synchronization and extraction circuit are carried out with the ingenious combinatorial logic design. The design process and the simulation results are given. Finally, this paper makes a joint simulation of the whole adjacent space digital transceiver system and makes a joint simulation. A systematic test environment is designed with the hardware platform. The output signals of the transmitter and the key signals in each function module in the digital reception are observed respectively. The correctness of the design of the system is verified and the requirements of the adjacent space communication protocol are met.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN927
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本文編號：2160788