本文選題：光學(xué)相控陣天線 + 光載射頻鏈路��； 參考：《浙江大學(xué)》2017年碩士論文

【摘要】：隨著當(dāng)今世界無線通信技術(shù)的飛速發(fā)展,人們對射頻收發(fā)系統(tǒng)的要求也越來越高。不但要求能夠支持大帶寬,具有高靈敏度,還要求其能達到體積盡可能小,重量盡可能輕,功耗盡可能低以及成本盡可能低等多方面要求。面對這樣的挑戰(zhàn),本文應(yīng)用微波光子學(xué)的理論知識和實踐經(jīng)驗來分析寬帶相控陣雷達系統(tǒng)中所遇到的問題,采用ROF鏈路來對調(diào)制到光域上的寬帶微波信號進行光學(xué)真延時,以期實現(xiàn)光子輔助寬帶射頻收發(fā)系統(tǒng)。論文首先從微波光子學(xué)的最基本構(gòu)成——光載射頻(Radio over Fiber,ROF)鏈路的基本組成元件出發(fā),分析其性能對增益、噪聲系數(shù)、無雜散動態(tài)范圍等鏈路重要指標的影響,并討論了鏈路指標的相關(guān)測試方法,從而保證系統(tǒng)進一步研究的正確選型和性能測試。接著探討了基于窄帶微波移相器的傳統(tǒng)相控陣雷達和基于光學(xué)真延時線的光學(xué)相控陣雷達的波束成形原理及其波束特性,結(jié)果表明使用光學(xué)真延時線,可以很好解決寬帶雷達的孔徑渡越問題。然后本文重點設(shè)計并制備了基于MEMS光開關(guān)的二進制差分結(jié)構(gòu)的可調(diào)光纖延時線,采用自行開發(fā)的高精度光纖研磨工藝,可將光纖長度精確控制在0.06mm以內(nèi),實現(xiàn)0.3ps的延時精度。在此基礎(chǔ)上,論文最后提出了8×8的新型平面相控陣收發(fā)系統(tǒng)的構(gòu)建方案,并詳細設(shè)計了基于自研的可調(diào)光纖真延時線的移相網(wǎng)絡(luò),對方案進行了可行性分析和仿真,設(shè)計出的相控陣系統(tǒng)的掃描指向誤差的球心角最大值為0.855°。另外再配合上接收系統(tǒng)中的光子信道化設(shè)計,可以降低對天線后端高速寬帶ADC的需求。
[Abstract]:With the rapid development of wireless communication technology in the world, the demand of RF transceiver system is higher and higher. It is required not only to support large bandwidth and high sensitivity, but also to achieve as small volume as possible, weight as light as possible, power consumption as low as possible and cost as low as possible. In the face of this challenge, this paper applies the theoretical knowledge and practical experience of microwave photonics to analyze the problems encountered in wideband phased array radar system, and uses ROF link to implement optical true delay of broadband microwave signal modulated to optical domain. In order to achieve photon-assisted broadband RF transceiver system. In this paper, the most basic component of microwave photonics, Radio over RF (Radio over FiberROF) link, is introduced to analyze the influence of its performance on the gain, noise coefficient and non-spurious dynamic range of the link. The related testing method of link index is discussed, so as to ensure the correct selection and performance test of the further study of the system. Then the beamforming principle and beam characteristics of traditional phased array radar based on narrowband microwave phase shifter and optical phased array radar based on optical true delay line are discussed. The results show that the optical true delay line is used. It can solve the problem of aperture crossing of wideband radar. Then the adjustable fiber delay line with binary differential structure based on MEMS optical switch is designed and fabricated in this paper. The fiber length can be accurately controlled within 0.06mm and the delay precision of 0.3ps can be realized by adopting the self-developed high-precision optical fiber grinding technology. On this basis, the paper finally proposes a new type of planar phased array transceiver system with 8 脳 8, and designs a phase shift network based on self-developed true delay line of adjustable optical fiber in detail. The feasibility analysis and simulation of the scheme are carried out. The maximum value of the scanning pointing error of the phased array system is 0.855 擄. In addition, with the photon channelization design in the upper receiving system, the demand for high-speed wideband ADC at the back end of the antenna can be reduced.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN859

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本文編號：2098346