本文關(guān)鍵詞：高精度激光測距雷達(dá)系統(tǒng)硬件設(shè)計　出處：《西安電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 線性調(diào)頻連續(xù)波激光雷達(dá) DFB激光器 光電反饋 迭代補(bǔ)償 FPGA

【摘要】：激光雷達(dá)自1961年被提出,在過去的50多年已有長足的發(fā)展,其中線性調(diào)頻連續(xù)波激光雷達(dá)(LFMCW Ladar)的研究是其中的一個重要方向,廣泛運(yùn)用于環(huán)境遙感、大氣監(jiān)測、精密測距等。本課題針對線性調(diào)頻連續(xù)波激光雷達(dá)高精度測距,特別是寬帶線性調(diào)頻激光的產(chǎn)生和接收進(jìn)行了研究,設(shè)計了適用于分布反饋(DFB)半導(dǎo)體激光器的線性調(diào)頻激光產(chǎn)生和接收系統(tǒng),該研究成果是激光雷達(dá)三維成像和合成孔徑激光雷達(dá)(Synthetic Aperture Ladar,SAL)等技術(shù)的基礎(chǔ)。本論文完成的工作包括以下幾個部分:1.介紹了激光雷達(dá)的發(fā)展,線性調(diào)頻激光實現(xiàn)測距的基本原理和本系統(tǒng)基于DFB激光器設(shè)計的實現(xiàn)激光線性調(diào)頻的方法較傳統(tǒng)方法的優(yōu)勢和難點。2.設(shè)計了一種帶光電反饋補(bǔ)償?shù)腄FB激光器驅(qū)動模塊。包括了系統(tǒng)的時鐘設(shè)計;FPGA+DAC的預(yù)置路驅(qū)動電壓設(shè)計;光電反饋環(huán)路,反饋環(huán)路低通濾波設(shè)計;FPGA+DDS的鑒相器參考頻率設(shè)計;電壓信號轉(zhuǎn)電流信號方案設(shè)計。3.設(shè)計了線性調(diào)頻激光信號的相干平衡接收電路,系統(tǒng)的激光信號接收電路有兩種方案,一種用于光電反饋補(bǔ)償路的激光信號接收,另一種用于測距路激光回波信號接收,這兩部分的激光功率和差頻信號帶寬不同,本系統(tǒng)設(shè)計了兩種不同的光電流信號轉(zhuǎn)電壓方案以滿足系統(tǒng)高信噪比要求。4.針對系統(tǒng)硬件低噪聲要求進(jìn)行板卡設(shè)計和關(guān)鍵信號線處理工作。5.使用MATLAB對光電反饋結(jié)果進(jìn)行深入分析,獲取DFB激光器的電流調(diào)諧特性,針對性地對驅(qū)動信號增加迭代補(bǔ)償和選擇最佳的光電反饋環(huán)路參數(shù)。
[Abstract]:Lidar has been proposed since 1961. In the past 50 years and more, the research of LFMCW Ladar is one of the important directions. It is widely used in environmental remote sensing, atmospheric monitoring, precision ranging and so on. In this paper, the generation and reception of LFM laser with high precision, especially wideband LFM laser, are studied. A linear frequency modulation (LFM) laser generation and receiving system is designed for distributed feedback DFB semiconductor lasers. The results of this research are lidar 3D imaging and synthetic Aperture Ladar. The work accomplished in this paper includes the following parts: 1. The development of lidar is introduced. The basic principle of realizing ranging by LFM laser and the advantages and difficulties of the method of realizing LFM based on DFB laser. 2. A DF with optoelectronic feedback compensation is designed. B laser drive module, including the clock design of the system; The design of preset drive voltage of FPGA DAC; Optoelectronic feedback loop, feedback loop low pass filter design; The design of the reference frequency of FPGA DDS; Design of voltage signal to current signal. 3. The coherent balanced receiving circuit of LFM laser signal is designed. There are two schemes in the laser signal receiving circuit of the system. One laser signal reception for optoelectronic feedback compensation path and the other for ranging path laser echo signal reception, the laser power and differential frequency signal bandwidth of the two parts are different. This system designed two different photocurrent signal switching schemes to meet the system high signal-to-noise ratio requirements .4.To meet the system hardware low noise requirements board design and key signal line processing work .5. use MAT. The results of optoelectronic feedback are analyzed by LAB. The current tuning characteristics of the DFB laser are obtained, and the iterative compensation of the driving signal and the selection of the optimal optoelectronic feedback loop parameters are proposed.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN958.98

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本文編號：1422035