海天背景下大型舰船红外成像仿真

发布时间：2018-01-12 13:39

本文关键词：海天背景下大型舰船红外成像仿真　出处：《哈尔滨工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：众所周知,我国不仅是领土大国,也是海域大国,而确保海域安全更是国家政策之一。并且,一定背景条件下目标红外仿真对攻防两方都至关重要,对于攻方,研究目标红外热像,能够较好的识别和跟踪目标以便进行有效打击;而对于防守方,对目标红外特性进行研究,能够针对目标探测和制导的不同情况,采取有效地隐身措施。至此,关于海上舰船目标的红外仿真一直成为国内学者研究的重点。本文基于此现状,对处于背景条件下的目标红外仿真进行了尝试,实现了海天背景下大型舰船的红外成像相关研究,其主要工作分为以下三个部分:(1)粗糙海面与大型舰船相结合的三维几何模型建立粗糙海面与大型舰船相结合的三维几何模型是研究海天背景下大型舰船的红外成像的基础,它是影响红外辐射模型中的发射率和反射率等参数的主要因素。但其三维几何模型由于复杂性和多变性直接使用画图软件却很难实现,而本文所应用的思想是:首先,基于应用广泛的Cox-Munk海谱模型,运用线性过滤法实现了粗糙海面几何模型的建立,并且此几何模型能够较好的反映风速和风向等主要因素对其产生的影响。同时,再使用Auto-CAD软件建立大型舰船三维几何模型,并对其周围建立了一定范围的海平面,然后再使用ANSYS有限元软件对加入海平面的大型舰船实行网格划分,进一步,运用已建立的粗糙海面再对海平面采用二维线性插值,从而得到粗糙海面与舰船相结合的三维几何模型。(2)粗糙海面红外辐射模型建立关于粗糙海面红外辐射模型的建立,主要就是实现相关红外辐射参数计算的过程。如果能够已知相应的发射率和反射率模型以及对海面作用的天空和太阳辐射等,就可以得出对应的粗糙海面微元的辐射强度,最后完成红外热成像。本文是在三维粗糙海面模型的基础上,基于Cox-Munk海谱模型,实现了粗糙海面发射率和反射率模型。同时,使用Modtran软件模拟了在不同探测角度下波段3~5μm和8~12μm的透过率以及在相同条件下的天空辐射和太阳辐射。(3)海天背景下大型舰船红外热成像本文是在具备大型舰船红外辐射模型基础上,完成了大型舰船所处的粗糙海面红外辐射模型。然后再运用网络裁剪法实现了在不同条件下海天背景舰船红外热成像,并且,分别分析天气环境、风速、喷水雾等对红外热成像造成的影响以及在不同探测距离和探测视角下的红外热成像,从而为红外热成像波段选择及隐身防护技术等奠定基础。
[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.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN219;E925.6

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