【摘要】：在現(xiàn)代電子戰(zhàn)環(huán)境中,雷達(dá)面臨著許多的威脅,需要具備抗干擾和強(qiáng)生存能力,因而要求雷達(dá)波形產(chǎn)生器具備產(chǎn)生高穩(wěn)定、寬頻帶、快速跳變以及任意形式波形輸出的能力,并且在有些場(chǎng)合,需要產(chǎn)生雙通道甚至多通道的輸出信號(hào),且要求這些輸出信號(hào)參數(shù)可調(diào)以及具有通道一致性。而隨著現(xiàn)代數(shù)字技術(shù)的迅速發(fā)展,直接數(shù)字合成(DDS)技術(shù)得到了廣泛的應(yīng)用,數(shù)字方式產(chǎn)生的波形有著嚴(yán)格相干性、高穩(wěn)定性、高頻率分辨率以及可編程等優(yōu)點(diǎn)。因此研究基于數(shù)字技術(shù)的寬帶雙通道波形產(chǎn)生器具有重要的意義。本文在深入研究了DDS的工作原理以及中頻線性調(diào)頻信號(hào)的產(chǎn)生方法的基礎(chǔ)上,設(shè)計(jì)了基于DDWS結(jié)構(gòu)的數(shù)字基帶+數(shù)字正交調(diào)制的多路并行的波形產(chǎn)生方案,并且根據(jù)此方案完成了寬帶雙通道波形產(chǎn)生器的波形產(chǎn)生部分的FPGA實(shí)現(xiàn),最后對(duì)輸出信號(hào)波形進(jìn)行了系統(tǒng)級(jí)仿真。本文的主要工作包括:(1)介紹了雷達(dá)信號(hào)處理的一些基本理論知識(shí),包括信號(hào)檢測(cè)理論、匹配濾波理論和脈沖壓縮理論。(2)分析了DDS的工作原理,介紹了基于DDWS結(jié)構(gòu)的中頻線性調(diào)頻信號(hào)的產(chǎn)生方法。(3)分析了內(nèi)插濾波的多相結(jié)構(gòu)設(shè)計(jì)和數(shù)控振蕩器(NCO)的控制方法,提出了基于DDWS結(jié)構(gòu)的數(shù)字基帶+數(shù)字正交調(diào)制的多路并行的波形產(chǎn)生方案。(4)依據(jù)波形產(chǎn)生方案完成了寬帶雙通道波形產(chǎn)生器的FPGA實(shí)現(xiàn),對(duì)FPGA內(nèi)部的關(guān)鍵模塊進(jìn)行了分析與設(shè)計(jì),并完成了系統(tǒng)級(jí)仿真。
[Abstract]:In the environment of modern electronic warfare, radar faces many threats, and needs to have anti-jamming and strong survivability. Therefore, radar waveform generator is required to have the ability to produce high stability, wide band, fast jump and output of any form of waveform. In some cases, it is necessary to produce two-channel or even multi-channel output signals, and the parameters of the output signals are required to be adjustable and have channel consistency. With the rapid development of modern digital technology, direct digital synthesis (DDS) technology has been widely used. The waveform generated by digital mode has the advantages of strict coherence, high stability, high frequency resolution and programmable. Therefore, it is of great significance to study the wideband dual-channel waveform generator based on digital technology. On the basis of deeply studying the working principle of DDS and the generation method of if LFM signal, this paper designs a multi-channel parallel waveform generation scheme of digital baseband digital quadrature modulation based on DDWS structure. According to this scheme, the FPGA implementation of the waveform generation part of the broadband dual-channel waveform generator is completed. Finally, the output signal waveform is simulated at the system level. The main work of this paper is as follows: (1) some basic theories of radar signal processing are introduced, including signal detection theory, matched filtering theory and pulse compression theory. (2) the working principle of DDS is analyzed. The generation method of if LFM signal based on DDWS structure is introduced. (3) the design of polyphase structure of interpolation filter and the control method of NC oscillator (NCO) are analyzed. A multi-channel parallel waveform generation scheme of digital baseband digital quadrature modulation based on DDWS structure is proposed. (4) based on the waveform generation scheme, the FPGA implementation of wideband dual-channel waveform generator is completed, and the key modules in FPGA are analyzed and designed. System level simulation is completed.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TN741

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相關(guān)期刊論文 前1條

1 李衍忠,蔡英杰,姒強(qiáng),向敬成;DDS譜質(zhì)分析及其雜散抑制研究綜述[J];現(xiàn)代雷達(dá);2000年04期

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本文編號(hào)：2159836