微光夜视系统性能评价模型及其仿真软件研究

发布时间：2018-01-22 05:22

本文关键词： 微光夜视性能模型直视电视 MTF MRC 视距估算仿真　出处：《北京理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：微光夜视技术作为当今主要的夜视技术手段,在军用和民用方面都有着极为重要的作用,成为各国竞相发展和装备的光电成像技术。在对微光成像系统进行设计的过程当中,设计者总是希望设计出来的系统能够具有尽可能高的综合性能优势。描述微光成像系统性能的主要参数除极限分辨率、调制传递函(MTF)、信噪比和微光成像系统作用距离等外,近年来最小可分辨对比度(MRC)等一些新的性能参数也被认为是有效的评价方法。因此,对调制传递函(MTF)、最小可分辨对比度(MRC)和微光成像系统作用距离模型进行研究对微光成像系统的性能理论评价具有着重要意义。目前虽然对微光夜视系统性能评价模型的研究取得了明显进展,但是在实际应用中相关的研制单位和个人或因为对模型的了解不足,或因为缺乏统一的评价工具,使得在一些微光夜视系统的论证和分析中,或仍采用早期简单适合手工计算的模型,或采用的计算模型不一致,往往使得论证和分析结果不统一,准确性差异较大,对实际评价产生不利影响。为了解决这一问题,本文分别对直视型微光夜视系统及电视型微光夜视系统进行了微光成像系统性能模型的研究。1)从微光夜视系统的光学传递函数(MTF)入手,分析了超二代与超三代像增强器传递特性(MTF)的差异,得出荧光屏MTF已渐成为影响像增强器MTF及其极限分辨率的主要因素;2)分析比较了已有基于人眼的最小可分辨对比度模型(MRC),得出了更为完善的MRC模型;3)通过对微光成像系统的整个成像过程的研究,综合考虑了影响其成像质量的因素,从而完善了基于MRC的作用距离模型;4)结合Visual C++对微光夜视性能模型进行了仿真。同时收集了国内外各代像增强器的参数,初步建立了比较完整的、便于操作的像管数据库。最后根据已有实际微光夜视系统性能参数,使用此仿真软件进行验证计算,通过对计算数据的比较分析,证实了仿真软件可以用于工程实践。
[Abstract]:As the main night-vision technology, LLL night vision plays an important role in both military and civil fields. In the process of designing the LLL imaging system, it has become the photovoltaic imaging technology which has been developed and equipped by many countries. Designers always hope that the designed system can have the highest comprehensive performance advantage. The main parameters of the LLL imaging system are except the limit resolution and the modulation transfer function (MTF). In recent years, some new performance parameters, such as minimum resolution contrast (MRC), etc., have been considered as effective evaluation methods in addition to the SNR and the operating range of the LLL imaging system. Therefore, MTF (modulation transfer function) is considered as an effective method. Minimum discernible contrast (MRC). The study of the LLL imaging system operating range model is of great significance to the theoretical evaluation of the LLL imaging system, although the research on the LLL night vision system performance evaluation model has made significant progress. But in the practical application of the relevant research and development units and individuals, or because of lack of understanding of the model, or because of the lack of a unified evaluation tools, make in some LLL night vision system demonstration and analysis. Either the early simple model suitable for manual calculation, or the inconsistent calculation model, often make the demonstration and analysis results are not uniform, and the accuracy of the model is quite different. Have a negative impact on actual evaluations... in order to address this issue. In this paper, the performance model of the LLL imaging system is studied, which is based on the optical transfer function (MTF) of the LLL night vision system and the TV LLL night vision system. The difference between the transfer characteristics of the super-second generation image intensifier and that of the super third generation image intensifier is analyzed. It is concluded that the fluorescent screen MTF has gradually become the main factor affecting the image intensifier MTF and its limit resolution. 2) A more perfect MRC model is obtained by comparing the existing minimum resolution contrast models based on human eyes. 3) through the study of the whole imaging process of LLL imaging system, the factors affecting the imaging quality of LLL imaging system are considered synthetically, and the action distance model based on MRC is improved. 4) combining with Visual C, the performance model of LLL night vision is simulated. At the same time, the parameters of each generation image intensifier at home and abroad are collected, and a relatively complete model is established. Finally, according to the actual LLL night vision system performance parameters, the simulation software is used to verify the calculation, through the comparative analysis of the calculated data. It is proved that the simulation software can be used in engineering practice.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN223

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