云对地球与临边背景红外辐射特性影响研究及模拟
发布时间：2019-05-28 12:44
【摘要】：科学技术的腾飞促进了世界范围内的军事竞争,鉴于各类飞行器、导弹等武器的大威力性和攻击过程中的快速性,建立相应的防护系统已经是国防工作的重点。天基红外探测作为目前最成熟可靠的探测手段,对防护系统起到重要支撑作用,针对背景的红外模拟自然也成为国内外学者重点研究的课题。高轨探测器进行目标探测时,目标主要处于地球背景或大气临边背景中。真实情况中,不同地表类型和大气模式之间存在较大差异,同时底层大气中气象条件也较为复杂,这都为红外背景模拟提出了难题。针对以上问题,本文工作主要围绕以下几个方面展开:首先,利用成熟的大气传输模型MODTRAN4,计算了 2个大气窗口下具有典型大气和地表特征的区域在无云大气和典型水云大气条件下观测路径辐射亮度和透过率。针对无云情况总结对比了不同地表类型、大气模式、气溶胶对的背景辐射传输的影响。针对有云情况,分析总结了不同云条件下背景辐射的传输特点。通过对比两种情况下的路径透过率和各成分辐射亮度计算结果,分析了云对地球背景和临边背景辐射传输的影响。同时通过定义和计算辐射亮度的相对变化比例,讨论了地球背景模拟中水云与地表的图像区分问题。计算和分析结果对模型构建提供理论基础和数据支持。其次,通过对相关气象资料和地理资料的总结和梳理,对全球地表类型和适用的大气模式进行了简化分类,根据纬度对整体及个别区域条件下出现的云类型、云量等进行了确定,结合已计算的结果,建立了相应数据库。并在课题组原有的地球及临边红外背景模型的基础上,建立了探测视场模型和视场中的云红外辐射模型,实现了对指定区域条件下的地球背景的探测视场模拟以及视场内指定云场景的模拟。本文的工作实现了指定探测视场下的多种有云条件的地球红外背景模拟,对原有的地球及临边背景辐射模型有一定的完善作用,提高了模型的实用性。探测视场内的红外辐射仿真结果考虑了地表类型、大气模式和云量等因素,能够较为真实的呈现出了指定地理位置下探测视场内的地球及临边背景的红外辐射特征,对红外目标识别与模拟技术有一定支持作用。
[Abstract]:The take-off of science and technology has promoted the military competition in the world. In view of the great power of all kinds of aircraft, missiles and other weapons and the rapidity in the process of attack, the establishment of the corresponding protection system has become the focus of national defense work. As the most mature and reliable detection method, space-based infrared detection plays an important supporting role in the protection system. Infrared simulation for the background has naturally become a key research topic for scholars at home and abroad. When the high orbit detector is used for target detection, the target is mainly in the background of the earth or the edge of the atmosphere. In the real situation, there are great differences between different surface types and atmospheric models, and the meteorological conditions in the bottom atmosphere are also more complex, which poses a difficult problem for infrared background simulation. In view of the above problems, the work of this paper mainly focuses on the following aspects: first, using the mature atmospheric transmission model MODTRAN4, The radiance and transmittance of the observed paths in two atmospheric windows with typical atmospheric and surface characteristics are calculated under the conditions of cloudless atmosphere and typical water cloud atmosphere. The effects of different surface types, atmospheric models and aerosols on background radiation transport are summarized and compared according to the cloudless condition. According to the cloud situation, the transmission characteristics of background radiation under different cloud conditions are analyzed and summarized. By comparing the calculated results of path transmittance and radiance of each component in the two cases, the influence of clouds on the radiation transmission between the earth background and the adjacent background is analyzed. At the same time, by defining and calculating the relative variation ratio of radiance, the image distinction between water cloud and surface in earth background simulation is discussed. The results of calculation and analysis provide theoretical basis and data support for the construction of the model. Secondly, by summing up and combing the relevant meteorological data and geographical data, the global surface types and applicable atmospheric models are simplified and classified, and the cloud types under the overall and individual regional conditions are classified according to the latitude. The cloud cover is determined, and the corresponding database is established according to the calculated results. On the basis of the original infrared background model of the earth and the edge of the research group, the detection field of view model and the cloud infrared radiation model in the field of view are established. The field of view simulation of the earth background and the simulation of the specified cloud scene in the field of view are realized. The work of this paper realizes the infrared background simulation of the earth with cloud conditions under the specified detection field of view, which can perfect the original earth and adjacent background radiation model to a certain extent, and improve the practicability of the model. The infrared radiation simulation results in the detection field of view take into account the surface type, atmospheric model and cloud cover, which can show the infrared radiation characteristics of the earth and the adjacent background in the detection field of view at a specified geographical position. It can support infrared target recognition and simulation technology to a certain extent.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN215
本文编号：2487073
[Abstract]:The take-off of science and technology has promoted the military competition in the world. In view of the great power of all kinds of aircraft, missiles and other weapons and the rapidity in the process of attack, the establishment of the corresponding protection system has become the focus of national defense work. As the most mature and reliable detection method, space-based infrared detection plays an important supporting role in the protection system. Infrared simulation for the background has naturally become a key research topic for scholars at home and abroad. When the high orbit detector is used for target detection, the target is mainly in the background of the earth or the edge of the atmosphere. In the real situation, there are great differences between different surface types and atmospheric models, and the meteorological conditions in the bottom atmosphere are also more complex, which poses a difficult problem for infrared background simulation. In view of the above problems, the work of this paper mainly focuses on the following aspects: first, using the mature atmospheric transmission model MODTRAN4, The radiance and transmittance of the observed paths in two atmospheric windows with typical atmospheric and surface characteristics are calculated under the conditions of cloudless atmosphere and typical water cloud atmosphere. The effects of different surface types, atmospheric models and aerosols on background radiation transport are summarized and compared according to the cloudless condition. According to the cloud situation, the transmission characteristics of background radiation under different cloud conditions are analyzed and summarized. By comparing the calculated results of path transmittance and radiance of each component in the two cases, the influence of clouds on the radiation transmission between the earth background and the adjacent background is analyzed. At the same time, by defining and calculating the relative variation ratio of radiance, the image distinction between water cloud and surface in earth background simulation is discussed. The results of calculation and analysis provide theoretical basis and data support for the construction of the model. Secondly, by summing up and combing the relevant meteorological data and geographical data, the global surface types and applicable atmospheric models are simplified and classified, and the cloud types under the overall and individual regional conditions are classified according to the latitude. The cloud cover is determined, and the corresponding database is established according to the calculated results. On the basis of the original infrared background model of the earth and the edge of the research group, the detection field of view model and the cloud infrared radiation model in the field of view are established. The field of view simulation of the earth background and the simulation of the specified cloud scene in the field of view are realized. The work of this paper realizes the infrared background simulation of the earth with cloud conditions under the specified detection field of view, which can perfect the original earth and adjacent background radiation model to a certain extent, and improve the practicability of the model. The infrared radiation simulation results in the detection field of view take into account the surface type, atmospheric model and cloud cover, which can show the infrared radiation characteristics of the earth and the adjacent background in the detection field of view at a specified geographical position. It can support infrared target recognition and simulation technology to a certain extent.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN215
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