【摘要】：光學(xué)相控陣?yán)走_(dá)在波束捷變、多波束掃描、低相干性以及高精度等方面,相對傳統(tǒng)雷達(dá)具有很大的優(yōu)勢,應(yīng)用日益廣泛。液晶光學(xué)相控陣?yán)走_(dá)具有體積小、重量輕、驅(qū)動電壓低等優(yōu)點(diǎn),具有良好的應(yīng)用前景,已成為國內(nèi)外研究的熱點(diǎn)。而保證液晶光學(xué)相控陣精確、高效的控制波束偏轉(zhuǎn)的核心部件——波束控制器是液晶光學(xué)相控陣?yán)走_(dá)實(shí)現(xiàn)的關(guān)鍵。本文主要針對液晶光學(xué)相控陣?yán)走_(dá)波束控制器的硬件設(shè)計(jì)與實(shí)現(xiàn)問題,開展了如下工作:1、基于閃耀光柵光學(xué)衍射模型,通過對液晶移相器的基本原理與微波相控陣?yán)走_(dá)的波束控制理論的介紹,分析比較液晶移相器與微波相控陣波束控制原理的差異,研究了液晶光學(xué)相控陣的波束偏轉(zhuǎn)原理,并分析各種因素對偏轉(zhuǎn)性能的影響。2、通過對通過對波束偏轉(zhuǎn)誤差影響因素(電壓量化、液晶邊緣效應(yīng)、液晶移相器電極制造誤差)的分析,給出了波控掃描組件的關(guān)鍵性能指標(biāo);完成液晶移相器驅(qū)動芯片的選型和可提供256種可選電壓的多級脈寬調(diào)制電壓生成方案設(shè)計(jì),該方案有效地減少波控?cái)?shù)據(jù)量;利用巴特沃斯濾波器函數(shù)對液晶特性曲線進(jìn)行擬合,并給出掃描組件波控?cái)?shù)據(jù)生成方法;進(jìn)而完成了液晶光學(xué)相控陣波控掃描組件總體方案的設(shè)計(jì)。3、完成了對液晶驅(qū)動芯片和主控FPGA芯片等核心器件的選型、主控FPGA芯片Verilog控制程序設(shè)計(jì)、數(shù)據(jù)傳輸界面的設(shè)計(jì)與實(shí)現(xiàn)、硬件電路的設(shè)計(jì)與實(shí)現(xiàn)、電路單級調(diào)試,通過測試液晶驅(qū)動芯片輸出電壓波形與存儲空間中波控?cái)?shù)據(jù)之間的對應(yīng)關(guān)系,從而對設(shè)計(jì)的液晶光學(xué)相控陣波控器硬件電路方案進(jìn)行實(shí)現(xiàn)和驗(yàn)證。4、完成液晶波控器與液晶移相器之間的聯(lián)合調(diào)試,并總結(jié)調(diào)試經(jīng)驗(yàn);設(shè)計(jì)激光小角度(???3?)精確偏轉(zhuǎn)實(shí)驗(yàn),通過比對激光小角度偏轉(zhuǎn)理論結(jié)果和實(shí)驗(yàn)結(jié)果,驗(yàn)證了平臺的正確性;設(shè)計(jì)液晶特性曲線測試實(shí)驗(yàn),利用現(xiàn)有平臺對液晶移相器的特性曲線進(jìn)行測試,通過對實(shí)驗(yàn)結(jié)果的分析,最終得到液晶移相器的特性曲線。
[Abstract]:Compared with traditional radar, optical phased array radar has many advantages in beam agility, multi-beam scanning, low coherence and high precision. Liquid crystal optical phased array radar has many advantages, such as small volume, light weight, low driving voltage and so on. The key to the realization of liquid crystal optical phased array radar is to ensure the precision and efficiency of the beam controller, which is the core component of the liquid crystal optical phased array. In this paper, aiming at the hardware design and implementation of liquid crystal optical phased array radar beam controller, the following work is carried out: 1, based on the optical diffraction model of blazed grating. Based on the introduction of the basic principle of liquid crystal phase shifter and the beam control theory of microwave phased array radar, the difference between liquid crystal phase shifter and microwave phased array beam control principle is analyzed and compared, and the beam deflection principle of liquid crystal optical phased array is studied. The influence of various factors on the deflection performance is analyzed. The influence factors of beam deflection error (voltage quantization, liquid crystal edge effect, electrode manufacturing error of liquid crystal phase shifter) are analyzed. The key performance indexes of the wave-controlled scanning module are given, the type selection of the liquid crystal phase shifter drive chip and the design of the multi-stage pulse width modulation voltage generation scheme which can provide 256 kinds of optional voltages are completed, which can effectively reduce the data amount of wave control. The characteristic curve of liquid crystal is fitted by using Butterworth filter function, and the method of generating wave control data of scanning module is given. Then, the overall scheme of the liquid crystal optical phased array wave-controlled scanning module is designed. The selection of the core devices such as the liquid crystal drive chip and the master FPGA chip, the design of the main control FPGA chip Verilog control program, and the design and implementation of the data transmission interface are completed. The design and realization of hardware circuit, the single stage debugging of the circuit, and the corresponding relationship between the output voltage waveform of the LCD driver chip and the wave control data in the storage space are tested. Thus, the hardware circuit scheme of liquid crystal optical phased array wave controller is implemented and verified. 4, the joint debugging between liquid crystal wave controller and liquid crystal phase shifter is completed, and the experience of debugging is summarized. Precision deflection experiment, by comparing the theoretical and experimental results of laser small angle deflection, verify the correctness of the platform, design the test experiment of liquid crystal characteristic curve, use the existing platform to test the characteristic curve of liquid crystal phase shifter, test the characteristic curve of liquid crystal phase shifter. Finally, the characteristic curve of liquid crystal phase shifter is obtained by analyzing the experimental results.
【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】：TN958.92

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 蔡冬梅;薛麗霞;凌寧;姜文漢;;液晶空間光調(diào)制器相位調(diào)制特性研究[J];光電工程;2007年11期

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本文編號：2212521