本文關(guān)鍵詞：基于DLOS算法的激光探測成像仿真研究　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 激光主動探測 成像仿真 DLOS算法 復(fù)雜目標(biāo)

【摘要】：激光主動探測技術(shù)因其特有的性質(zhì),被廣泛的應(yīng)用于國土資源普查、森林火險預(yù)警、海面搜救等多個領(lǐng)域。隨著相關(guān)技術(shù)的發(fā)展及實際需求的日益增加,如何在惡劣天氣條件下實現(xiàn)主動探測成像,同時盡可能地使成像質(zhì)量得到提升,已成為相關(guān)技術(shù)領(lǐng)域中亟待解決的問題。目前激光探測成像任務(wù)存在投入高,周期長,風(fēng)險大等制約因素,采用數(shù)值仿真分析成為完成探測系統(tǒng)測試和優(yōu)化設(shè)計一種必要的手段。激光主動探測成像仿真采用模塊化思路,根據(jù)具體探測體制,建立包括激光雷達(dá)、大氣傳輸、探測目標(biāo)模塊的系統(tǒng)仿真模型。國外已經(jīng)針對激光探測成像系統(tǒng)開發(fā)了很多功能強大的仿真軟件,但可查閱資料中只介紹了仿真軟件的功能和圖像仿真的結(jié)果,對其核心算法、數(shù)學(xué)模型及仿真依據(jù)沒有給出詳細(xì)的說明解釋。而我國對激光探測成像仿真方面的研究,主要以分析激光探測系統(tǒng)性能,給出數(shù)值結(jié)果和關(guān)系式為主,能夠給出仿真圖像的很少。此外,國內(nèi)開發(fā)的成像仿真模型主要以二維目標(biāo)探測仿真為主,對于三維目標(biāo)探測這一核心技術(shù)的研究甚少,該技術(shù)成為國內(nèi)成像仿真軟件開發(fā)需重點解決的問題。綜上所述,本文將結(jié)合激光主動探測成像過程及特點,對傳統(tǒng)輻射傳輸計算方法—視在光線法(LOS)進(jìn)行改進(jìn),開發(fā)出一種適用于激光探測成像仿真的輻射傳輸計算方法—雙程視在光線法(DLOS),建立激光主動探測全鏈路仿真模型;針對二維簡單目標(biāo)和三維復(fù)雜目標(biāo)探測進(jìn)行仿真計算,并將計算結(jié)果與蒙特卡洛法(MCM)計算結(jié)果進(jìn)行對比,驗證雙程視在光線(DLOS)法的適用性和正確性;研究大氣介質(zhì)光學(xué)厚度、脈沖激光發(fā)散角、脈沖寬度、探測器成像陣列、探測器接收直徑等相關(guān)參數(shù)對二維目標(biāo)探測成像結(jié)果的影響;討論不同大氣介質(zhì)場景下的三維目標(biāo)探測成像結(jié)果,對相應(yīng)大氣場景條件的激光探測進(jìn)行波段優(yōu)選;結(jié)合實際大氣介質(zhì)分布特點,建立非均勻介質(zhì)探測成像仿真模型,研究分析非均勻介質(zhì)對成像結(jié)果的影響;同時將層析探測結(jié)果與非層析探測結(jié)果對比,分析層析探測的目標(biāo)識別優(yōu)勢;擴展研究任意探測方位下的成像仿真模型,為激光探測系統(tǒng)的開發(fā)和優(yōu)化設(shè)計提供參考和依據(jù)。
[Abstract]:Laser active detection technology has been widely used in many fields, such as land and resources survey, forest fire danger warning, sea surface search and rescue, etc. With the development of related technology and the increasing of actual demand, laser active detection technology has been widely used in many fields. How to realize active detection imaging under severe weather conditions and improve the imaging quality as much as possible has become an urgent problem in related technical fields. At present, laser detection and imaging task has a high investment. Because of the long period and high risk, numerical simulation is a necessary method to complete the testing and optimization design of the detection system, and the modular approach is adopted in the simulation of laser active detection imaging. According to the specific detection system, the system simulation model including laser radar, atmospheric transmission, detection target module has been established. Many powerful simulation software have been developed for laser detection imaging system abroad. However, only the function of the simulation software and the result of image simulation are introduced in the available data, and the core algorithm of the simulation software is given. The mathematical model and simulation basis are not explained in detail. However, the research on laser detection imaging simulation in China mainly focuses on the analysis of the performance of laser detection system, and gives the numerical results and relations. In addition, the imaging simulation model developed in China mainly focuses on two-dimensional target detection simulation, and the research on the core technology of three-dimensional target detection is very little. This technology has become a key problem to be solved in the development of domestic imaging simulation software. To sum up, this paper will combine the imaging process and characteristics of laser active detection. In this paper, the traditional radiative transmission calculation method-apparent light method (LOS) is improved, and a radiative transmission calculation method suitable for simulation of laser detection imaging is developed, which is called double-pass apparent light method (DLOS). The simulation model of laser active detection whole link is established. The two dimensional simple target and three dimensional complex target detection are simulated and calculated, and the results are compared with those of Monte Carlo method (MCM). To verify the applicability and correctness of the double-pass view in the light DLOS method; The effects of optical thickness of atmospheric media, laser divergence angle, pulse width, detector imaging array and detector receiving diameter on the imaging results of two-dimensional target detection are studied. The imaging results of 3D target detection in different atmospheric media scenarios are discussed, and the band selection for laser detection of the corresponding atmospheric scene conditions is carried out. According to the characteristics of atmospheric media distribution, the imaging simulation model of non-uniform medium detection is established, and the influence of non-uniform medium on imaging results is studied and analyzed. At the same time, comparing the results of chromatographic detection with the results of non-chromatographic detection, the advantages of target recognition in tomography detection are analyzed. The imaging simulation model under arbitrary detection azimuth is studied in order to provide reference and basis for the development and optimization design of laser detection system.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TN249

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