本文選題：寬帶 + LFM��； 參考：《東南大學(xué)》2016年碩士論文

【摘要】：隨著雷達(dá)技術(shù)的發(fā)展,雷達(dá)的應(yīng)用領(lǐng)域越來越廣泛,對(duì)雷達(dá)的要求已經(jīng)不僅僅局限于目標(biāo)的探測(cè),還要給出目標(biāo)的屬性和目標(biāo)的細(xì)微特征。寬帶相控陣?yán)走_(dá)結(jié)合寬帶雷達(dá)和相控陣?yán)走_(dá)的優(yōu)點(diǎn),可以滿足波束控制靈活、干擾抑制能力強(qiáng)以及分辨率高等眾多要求。與此同時(shí),雷達(dá)技術(shù)與無線通信技術(shù)的相似性使得雷達(dá)和通信系統(tǒng)的一體化成為可能。本課題研究的是寬帶LFM相控陣?yán)走_(dá)、通信一體化射頻前端。根據(jù)本課題的應(yīng)用背景和對(duì)常見收發(fā)鏈路方案的分析比較,本文選用了零中頻結(jié)構(gòu),射頻頻率為2.2-2.7GHz,帶寬500MHz。根據(jù)應(yīng)用場(chǎng)景確定系統(tǒng)指標(biāo),選擇合理的設(shè)計(jì)方案,并對(duì)收發(fā)前端進(jìn)行鏈路仿真,確定各模塊的指標(biāo)分配并根據(jù)分配指標(biāo)選擇合適的器件。然后,本文對(duì)收發(fā)鏈路的各關(guān)鍵模塊進(jìn)行了硬件設(shè)計(jì),包括正交調(diào)制模塊、正交解調(diào)模塊、低噪聲放大器模塊、功率放大器模塊以及3dB定向耦合器等。最后,本文分別對(duì)發(fā)射鏈路和接收鏈路的整體性能進(jìn)行了測(cè)試。發(fā)射鏈路的最大輸出功率為17dBm左右,500MHz帶寬內(nèi)的增益平坦度為1.2dB；射頻輸出的相位受基帶輸入控制,且基帶信號(hào)給固定權(quán)值時(shí),射頻輸出信號(hào)的移相偏差在3°以內(nèi)；當(dāng)基帶信號(hào)給動(dòng)態(tài)權(quán)值時(shí),波束掃描指向不會(huì)隨頻率變化而改變,且當(dāng)波束掃描指向0°時(shí),其副瓣電平為-14dB左右,波束掃描指向在±30°以內(nèi)時(shí),其副瓣電平維持在-10dB以下,和理論值基本一致；系統(tǒng)輸入2OMsps的16QAM調(diào)制信號(hào),發(fā)射鏈路在輸出10dBm功率時(shí)的EVM為2.8763%。接收鏈路的測(cè)試結(jié)果為：基帶I/Q輸出信號(hào)的幅度不平衡度在0.3dB以內(nèi),相位不平衡在2.4°以內(nèi)；接收機(jī)整體噪聲系數(shù)為5dB左右；20Msps、16QAM調(diào)制信號(hào)下測(cè)得的接收鏈路的EVM為1.681%。以上測(cè)試結(jié)果表明,該一體化射頻收發(fā)前端既能實(shí)現(xiàn)波束形成和波束掃描控制,又能滿足基本的通信性能需求。
[Abstract]:With the development of radar technology, the application of radar is becoming more and more extensive. The requirements of radar are not only limited to target detection, but also the attributes of target and the fine characteristics of target. Wideband phased array radar combines the advantages of wideband radar and phased array radar, which can meet the requirements of flexible beam control, strong interference suppression ability and high resolution. At the same time, the similarity between radar technology and wireless communication technology makes the integration of radar and communication system possible. This topic is the broadband LFM phased array radar, communication integration RF front-end. According to the application background of this subject and the analysis and comparison of common transceiver link schemes, the zero-if structure is chosen in this paper, the RF frequency is 2.2-2.7 GHz and the bandwidth is 500MHz. According to the application scenario, the system index is determined, the reasonable design scheme is selected, and the link simulation of the transceiver front-end is carried out, the index allocation of each module is determined and the appropriate device is selected according to the allocation index. Then, the key modules of the transceiver link are designed, including quadrature modulation module, quadrature demodulation module, low noise amplifier module, power amplifier module and 3dB directional coupler. Finally, the overall performance of transmission link and receiving link are tested. The maximum output power of the transmission link is about 17dBm and the gain flatness in 500MHz bandwidth is 1.2 dB.The phase of the RF output is controlled by the baseband input, and the phase shift deviation of the RF output signal is less than 3 擄when the baseband signal is given a fixed weight. When the baseband signal gives dynamic weight, the beam scanning direction does not change with the change of frequency, and the sidelobe level is about -14dB when the beam scanning point is 0 擄, and the sidelobe level is below -10dB when the beam scan direction is less than 鹵30 擄. The system inputs the 16QAM modulation signal of 2OMsps and the EVM of the transmission link is 2.8763 when the output power is 10dBm. The test results of the received link are as follows: the amplitude unbalance of the baseband I / Q output signal is less than 0.3 dB and the phase unbalance is within 2.4 擄, and the EVM of the received link measured under the receiver's overall noise coefficient is about 5 dB and 20 MspsN 16QAM modulation signal is 1.681. The test results show that the integrated RF transceiver can not only achieve beamforming and beam scanning control, but also meet the basic communication performance requirements.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TN958.92

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 劉澤華,王華;正交調(diào)制過程的誤差分析[J];現(xiàn)代電子技術(shù);2004年20期

2 盛啟龍,董燕,汪小燕;基于DDS的高穩(wěn)高純頻譜頻率源的設(shè)計(jì)[J];無線電工程;2003年12期

3 李廷軍,任建存,趙元立,張金華;雷達(dá)—通信一體化研究[J];現(xiàn)代雷達(dá);2001年02期

相關(guān)博士學(xué)位論文 前2條

1 嚴(yán)濟(jì)鴻;寬帶相控陣?yán)走_(dá)波束控制技術(shù)研究[D];電子科技大學(xué);2011年

2 李會(huì)勇;寬帶數(shù)字陣列波束形成算法及應(yīng)用研究[D];電子科技大學(xué);2009年

相關(guān)碩士學(xué)位論文 前1條

1 張琪;一體化雷達(dá)系統(tǒng)的高速通信技術(shù)研究[D];南京理工大學(xué);2012年

，

本文編號(hào)：2034694