發(fā)布時(shí)間：2018-09-05 17:41

【摘要】：近年來,激光以其高度相干性、高度單色性、高亮度、方向性強(qiáng)等特性在工業(yè)、農(nóng)業(yè)、醫(yī)學(xué)、國防建設(shè)以及科學(xué)實(shí)驗(yàn)等許多方面都具有非常廣泛的應(yīng)用,其中,激光測距就是激光技術(shù)在軍事、工程技術(shù)領(lǐng)域、現(xiàn)代體育賽事以及地形測繪等領(lǐng)域中的具體應(yīng)用。相位法激光測距技術(shù)研究的關(guān)鍵是相位差值的獲取,測距儀的測相誤差可以直接造成測距誤差,因此如何獲得可靠的相位差是值得研究的課題。本文針對相位法激光測距技術(shù)的研究重點(diǎn)即相位差檢測技術(shù)做了系統(tǒng)_的研究,所取得的主要研究成果為：1.結(jié)合具體的項(xiàng)目需求,針對高精度激光測距的指標(biāo)要求,分析比較了現(xiàn)有的各種相位差檢測方案和算法,確定了基于DFT的相位差檢測算法；2.分析了基于DFT的相位差檢測方法的誤差,針對這些誤差,采用一種改進(jìn)的“數(shù)據(jù)采集+加窗傅里葉變換+頻譜校正”DFT算法框架。本文對比了各種窗函數(shù)的性能,分析了各種頻譜校正方法的理論依據(jù),最終確定選用Hanning窗和比值校正法,詳細(xì)論述了該方案的原理和實(shí)現(xiàn)步驟；3.本文在對改進(jìn)的算法做了大量的仿真測試工作之后,還對仿真結(jié)果做了總結(jié)和整理,由仿真結(jié)果可知,本文所述檢測方案相比傳統(tǒng)的DFT檢測方法能夠大幅度提高相位差檢測精度,從而驗(yàn)證了改進(jìn)算法的有效性。
[Abstract]:In recent years, laser has been widely used in many fields, such as industry, agriculture, medicine, national defense construction and scientific experiment, because of its high coherence, high monochromaticity, high brightness and strong directivity. Among them, laser ranging is laser technology in military, engineering, modern sports and topographic mapping and other fields. The key of phase method laser ranging technology research is the acquisition of phase difference. The phase error of ranging instrument can directly cause ranging error. Therefore, how to obtain reliable phase difference is worth studying. The main research results are as follows: 1. According to the specific project requirements and the requirements of high-precision laser ranging, the existing phase difference detection schemes and algorithms are analyzed and compared, and the phase difference detection algorithm based on DFT is determined; 2. The error of phase difference detection method based on DFT is analyzed, and one method is adopted to solve these errors. An improved "data acquisition + windowed Fourier transform + spectrum correction" DFT algorithm framework is proposed. In this paper, the performance of various window functions is compared, and the theoretical basis of various spectrum correction methods is analyzed. Finally, the Hanning window and ratio correction method are selected, and the principle and implementation steps of the scheme are discussed in detail. After doing a lot of simulation and testing work, the simulation results are summarized and sorted out. The simulation results show that the proposed detection scheme can greatly improve the phase difference detection accuracy compared with the traditional DFT detection method, thus verifying the effectiveness of the improved algorithm.
【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】：TM933.312;TN249

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本文編號：2224987