本文關(guān)鍵詞：海天背景下大型艦船紅外成像仿真　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： 艦船目標(biāo) Cox-Munk 粗糙海面 Modtran 紅外熱像

【摘要】：眾所周知,我國不僅是領(lǐng)土大國,也是海域大國,而確保海域安全更是國家政策之一。并且,一定背景條件下目標(biāo)紅外仿真對攻防兩方都至關(guān)重要,對于攻方,研究目標(biāo)紅外熱像,能夠較好的識別和跟蹤目標(biāo)以便進(jìn)行有效打擊;而對于防守方,對目標(biāo)紅外特性進(jìn)行研究,能夠針對目標(biāo)探測和制導(dǎo)的不同情況,采取有效地隱身措施。至此,關(guān)于海上艦船目標(biāo)的紅外仿真一直成為國內(nèi)學(xué)者研究的重點(diǎn)。本文基于此現(xiàn)狀,對處于背景條件下的目標(biāo)紅外仿真進(jìn)行了嘗試,實現(xiàn)了海天背景下大型艦船的紅外成像相關(guān)研究,其主要工作分為以下三個部分:(1)粗糙海面與大型艦船相結(jié)合的三維幾何模型建立粗糙海面與大型艦船相結(jié)合的三維幾何模型是研究海天背景下大型艦船的紅外成像的基礎(chǔ),它是影響紅外輻射模型中的發(fā)射率和反射率等參數(shù)的主要因素。但其三維幾何模型由于復(fù)雜性和多變性直接使用畫圖軟件卻很難實現(xiàn),而本文所應(yīng)用的思想是:首先,基于應(yīng)用廣泛的Cox-Munk海譜模型,運(yùn)用線性過濾法實現(xiàn)了粗糙海面幾何模型的建立,并且此幾何模型能夠較好的反映風(fēng)速和風(fēng)向等主要因素對其產(chǎn)生的影響。同時,再使用Auto-CAD軟件建立大型艦船三維幾何模型,并對其周圍建立了一定范圍的海平面,然后再使用ANSYS有限元軟件對加入海平面的大型艦船實行網(wǎng)格劃分,進(jìn)一步,運(yùn)用已建立的粗糙海面再對海平面采用二維線性插值,從而得到粗糙海面與艦船相結(jié)合的三維幾何模型。(2)粗糙海面紅外輻射模型建立關(guān)于粗糙海面紅外輻射模型的建立,主要就是實現(xiàn)相關(guān)紅外輻射參數(shù)計算的過程。如果能夠已知相應(yīng)的發(fā)射率和反射率模型以及對海面作用的天空和太陽輻射等,就可以得出對應(yīng)的粗糙海面微元的輻射強(qiáng)度,最后完成紅外熱成像。本文是在三維粗糙海面模型的基礎(chǔ)上,基于Cox-Munk海譜模型,實現(xiàn)了粗糙海面發(fā)射率和反射率模型。同時,使用Modtran軟件模擬了在不同探測角度下波段3~5μm和8~12μm的透過率以及在相同條件下的天空輻射和太陽輻射。(3)海天背景下大型艦船紅外熱成像本文是在具備大型艦船紅外輻射模型基礎(chǔ)上,完成了大型艦船所處的粗糙海面紅外輻射模型。然后再運(yùn)用網(wǎng)絡(luò)裁剪法實現(xiàn)了在不同條件下海天背景艦船紅外熱成像,并且,分別分析天氣環(huán)境、風(fēng)速、噴水霧等對紅外熱成像造成的影響以及在不同探測距離和探測視角下的紅外熱成像,從而為紅外熱成像波段選擇及隱身防護(hù)技術(shù)等奠定基礎(chǔ)。
[Abstract]:As we all know, our country is not only a territorial power, but also a sea power, and to ensure the safety of the sea is one of the national policies. Moreover, under certain background conditions, the target infrared simulation is very important for both sides of attack and defense, for the attacking side. Research target infrared thermal image, can better identify and track the target in order to carry out an effective strike; For the defense, the infrared characteristic of the target can be studied, and the effective stealth measures can be taken according to the different situations of target detection and guidance. The infrared simulation of marine ship targets has been the focus of domestic scholars. Based on this situation, this paper tries to simulate the targets in the background. The infrared imaging of large ships under the background of sea and sky is realized. Its main work is divided into the following three parts: 1). A 3D geometric model combining rough sea surface with large ship the 3D geometric model of rough sea surface and large ship is the basis of studying the infrared imaging of large ships under the background of sea and sky. It is the main factor that affects the emissivity and reflectivity of infrared radiation model, but it is difficult to realize the 3D geometric model directly by drawing software because of its complexity and variability. The idea of this paper is as follows: firstly, based on the widely used Cox-Munk sea spectrum model, the rough sea surface geometric model is established by linear filtering method. And this geometric model can reflect the influence of wind speed and wind direction on it. At the same time, the Auto-CAD software is used to build the 3D geometric model of large ships. A certain range of sea level is established around the sea level, and then the ANSYS finite element software is used to mesh the large ships with sea level. Using the established rough sea surface and then using two-dimensional linear interpolation to sea level. Thus, the 3D geometric model of rough sea surface and ship is obtained.) the infrared radiation model of rough sea surface is established on the establishment of infrared radiation model of rough sea surface. If the corresponding emissivity and reflectivity models and the sky and solar radiation acting on the sea surface can be known. The corresponding radiation intensity of the rough sea surface microelements can be obtained, and finally the infrared thermal imaging is completed. This paper is based on the three-dimensional rough sea surface model based on the Cox-Munk sea spectrum model. The emissivity and reflectivity models of rough sea surface are realized. The transmittance of 3 ~ 5 渭 m and 8 ~ 12 渭 m at different detection angles and sky and solar radiation under the same conditions were simulated by Modtran software. Infrared thermal imaging of large ships under sea and sky background this paper is based on the infrared radiation model of large ships. The infrared radiation model of the rough sea surface of large ship is completed. Then the infrared thermal imaging of the ship in the sea and sky background under different conditions is realized by using the network clipping method, and the weather environment and wind speed are analyzed respectively. The influence of water spray on infrared thermal imaging and the infrared thermal imaging under different detection range and angle of view lay a foundation for the selection of infrared thermal imaging band and stealth protection technology.
【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】：TN219;E925.6

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本文編號：1414522