【摘要】：分布式雷達(dá)組網(wǎng)技術(shù)是為了應(yīng)對現(xiàn)代戰(zhàn)場上電子干擾和反輻射導(dǎo)彈等“四大威脅”而形成的一種新的雷達(dá)體制,是伴隨著現(xiàn)代軍用電子設(shè)備向系統(tǒng)化發(fā)展的趨勢而誕生的。組網(wǎng)后,網(wǎng)內(nèi)的單部雷達(dá)不僅保留了各自的特性,而且彼此之間還可以實現(xiàn)信息資源的共享,有效發(fā)揮出組網(wǎng)后的系統(tǒng)化作戰(zhàn)效能。然而分站雷達(dá)在與數(shù)據(jù)處理中心進(jìn)行無線通信時由于信道固有的噪聲和衰落特性以及環(huán)境噪聲的影響,傳輸信號不可避免的會受到各種干擾,特別是由于城市障礙物造成的多徑干擾而出現(xiàn)傳輸錯誤,因此保證分站雷達(dá)與數(shù)據(jù)處理中心之間可靠、高效地傳輸信息是雷達(dá)組網(wǎng)后的關(guān)鍵問題之一。本課題研究的對象是多基雷達(dá)組網(wǎng)形式,即整個雷達(dá)組網(wǎng)系統(tǒng)包含多個雷達(dá)發(fā)射站和一個數(shù)據(jù)處理中心。本文針對分站與數(shù)據(jù)處理中心通信過程中存在的數(shù)據(jù)可靠性問題和抗干擾問題進(jìn)行了深入的研究,并提出基于FPGA的雷達(dá)目標(biāo)信息傳輸系統(tǒng)的設(shè)計方案。根據(jù)設(shè)計方案對各部分進(jìn)行建模,在建模的基礎(chǔ)上再進(jìn)行抗干擾性能分析和設(shè)計實現(xiàn)。主要工作包括:1.對常用的幀同步方法進(jìn)行了研究,并在詳細(xì)分析本課題設(shè)計的數(shù)據(jù)幀結(jié)構(gòu)的基礎(chǔ)上,根據(jù)幀結(jié)構(gòu)的特點(diǎn)選擇了合適的幀同步檢測方法和參數(shù),給出FPGA的模塊設(shè)計和仿真。2.深入了解了信息傳輸中的的可靠性技術(shù)、差錯控制編碼理論,著重對其中的卷積編碼和Viterbi譯碼算法進(jìn)行了深入的研究。根據(jù)課題需求,確定了卷積編碼器的約束長度、碼率以及Viterbi譯碼器的回溯深度,并給出了FPGA設(shè)計方案。3.完成了對擴(kuò)頻通信的原理、特點(diǎn)、系統(tǒng)模型的研究。根據(jù)本課題需要,著重對直擴(kuò)系統(tǒng)進(jìn)行了深入的研究,對常用的偽隨機(jī)碼進(jìn)行了分析和比較;對擴(kuò)頻同步中的偽碼捕獲與跟蹤、MSK調(diào)制解調(diào)等技術(shù)研究分析,并給出其FPGA的設(shè)計方案。4.利用Simulink通信仿真平臺對傳輸系統(tǒng)和各模塊進(jìn)行建模與仿真,對卷積編譯碼和直擴(kuò)系統(tǒng)進(jìn)行抗干擾分析。采用Verilog語言、QuartusII 9.0對傳輸系統(tǒng)的設(shè)計方案進(jìn)行設(shè)計實現(xiàn),并利用Modelsim仿真工具對實現(xiàn)方案進(jìn)行仿真,結(jié)合Simulink的理論仿真結(jié)果驗證了方案的可行性以及正確性。
[Abstract]:Distributed radar networking technology is a new radar system formed to deal with the "four threats" of electronic interference and anti-radiation missile in modern battlefield, which is born with the trend of systematic development of modern military electronic equipment. After networking, the single radar in the network not only retains its own characteristics, but also can share the information resources with each other, and give full play to the systematic combat effectiveness after networking. However, when the sub-station radar communicates with the data processing center wirelessly, due to the inherent noise and fading characteristics of the channel and the influence of environmental noise, the transmission signal will inevitably be interfered with, especially due to the multi-path interference caused by urban obstacles, so it is one of the key problems to ensure the reliability between the sub-station radar and the data processing center, and to transmit the information efficiently. The research object of this paper is the multi-base radar networking form, that is, the whole radar networking system includes multiple radar transmitting stations and a data processing center. In this paper, the data reliability and anti-interference problems existing in the communication process between the sub-station and the data processing center are deeply studied, and the design scheme of radar target information transmission system based on FPGA is put forward. According to the design scheme, each part is modeled, and then the anti-interference performance is analyzed and implemented on the basis of modeling. The main work includes: 1. The common frame synchronization methods are studied, and based on the detailed analysis of the data frame structure designed in this paper, the appropriate frame synchronization detection methods and parameters are selected according to the characteristics of the frame structure, and the module design and simulation of FPGA are given. 2. The reliability technology and error control coding theory in information transmission are deeply understood, and the convolution coding and Viterbi decoding algorithm are studied in detail. According to the requirements of the project, the constraint length, bit rate and backtracking depth of Viterbi decoder are determined, and the design scheme of FPGA is given. The principle, characteristics and system model of spread spectrum communication are studied. According to the needs of this subject, the DSSS system is deeply studied, the commonly used pseudorandom codes are analyzed and compared, and the pseudo-code acquisition and tracking, MSK modulation and demodulation techniques in spread spectrum synchronization are studied and analyzed, and the design scheme of FPGA is given. 4. The Simulink communication simulation platform is used to model and simulate the transmission system and each module, and the anti-interference analysis of convolutional coding and decoding and DSSS system is carried out. Verilog language and QuartusII 9.0 are used to design and implement the transmission system, and Modelsim simulation tool is used to simulate the scheme. Combined with the theoretical simulation results of Simulink, the feasibility and correctness of the scheme are verified.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN957.52

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 丁溯泉,楊知行,潘長勇,郭興波;擴(kuò)頻技術(shù):歷史、現(xiàn)狀及發(fā)展[J];電訊技術(shù);2004年06期

2 吳亞婷;;卷積碼編譯碼的Matlab仿真及其性能研究[J];電腦知識與技術(shù);2010年04期

3 殷云志;;無線通信抗干擾技術(shù)及發(fā)展趨勢[J];無線電工程;2008年10期

相關(guān)碩士學(xué)位論文 前1條

1 胡偉;基于FPGA的Turbo碼編譯碼器研發(fā)[D];西安電子科技大學(xué);2011年

，

本文編號：2500208