基于氧光谱吸收特性的单目单波段被动测距
发布时间：2018-11-12 18:15
【摘要】：在当代电子对抗环境中,随着对军事装备的精确度和进攻速度的需求日益提高,对目标被动测距的精度和应用范围要求也越来越高。随着光电技术的发展,红外目标大气传输特性的相关研究也愈发深入,基于大气传输特性的被动测距方法也愈发受到研究者的重视。由于氧气在大气中分布比例恒定,且在氧气A吸收带附近受其他气体的干扰非常小,所以利用氧气的吸收特性进行被动测距,测距精度高,测距的距离范围更广在氧气吸收光谱特性的理论框架下,本文利用大气仿真软件MODTRAN,建立了不同传输条件下的大气红外传输模型,得到了一系列传输参数。确定了研究不同环境条件变化对氧气吸收率影响的方法,分别研究了不同环境因素,如天顶角度、观测点海拔高度、观测点经度、纬度等,的变化对A带内氧气吸收率的影响,明确了氧气吸收率与各种环境条件间的变化关系,并得到了氧气吸收率随不同环境条件变化的经验公式。在对氧气吸收率随不同环境条件变化的分析研究的基础上,本文确定了基于氧气A吸收带进行被动测距的研究范围,然后在对已有测距方案研究分析的基础上,提出利用几种常见的S型曲线作为氧气平均吸收率随传输距离变化的经验公式进行研究,经过对公式计算性能和算法复杂度的综合考虑,结合本文的实际需求,提出并确定了本文中使用的氧气平均吸收率随辐射传输距离变化的经验公式。为了更全面且细致的研究辐射传输距离与氧气吸收率间的关系,并最终实现被动测距,本文创新地提出了以天顶角度和观测点海拔高度作为研究对象,在不同的辐射传输距离上,建立氧气吸收率随这两项环境条件变化的三维模型,进而实现被动测距。实现过程中,分别在辐射传输距离为5km,10km,20km,35km, 50km时,通过大量的计算和拟合,建立出了所需的三维曲面模型,并最终将这五个三维模型图整合在同一个三维立体中,得到平均氧气吸收率随天顶角度和观测点海拔高度变化的三维模型。在建立出的三维模型的基础上,进行了被动测距的仿真实验,验证了利用建立三维曲面模型来进行测距方案的可行性,精确率较好,测距相对误差在3%以内,为基于氧气吸收特性的被动测距提供了一个新思路。
[Abstract]:In the modern electronic countermeasure environment, with the increasing demand for the precision and attack speed of military equipment, the accuracy and application range of target passive ranging are more and more demanding. With the development of optoelectronic technology, the research on the atmospheric transmission characteristics of infrared target has become more and more in-depth, and the passive ranging method based on the atmospheric transmission characteristics has been paid more and more attention by researchers. Because the proportion of oxygen distribution in the atmosphere is constant, and the interference from other gases is very small near the oxygen A absorption band, the passive distance finding is carried out by using the absorption characteristics of oxygen, and the ranging accuracy is high. The range of ranging is wider under the theoretical framework of oxygen absorption spectrum characteristics. In this paper, the atmospheric infrared transmission model under different transmission conditions is established by using the atmospheric simulation software MODTRAN, and a series of transmission parameters are obtained. The methods of studying the effect of different environmental conditions on the oxygen absorption rate were determined, and the effects of different environmental factors, such as zenith angle, altitude, longitude, latitude, etc., on the oxygen absorption rate in band A were studied respectively. The relationship between oxygen absorption rate and various environmental conditions is clarified, and the empirical formula of oxygen absorption rate changing with different environmental conditions is obtained. On the basis of the analysis and study of oxygen absorption rate changing with different environmental conditions, this paper determines the research range of passive ranging based on oxygen A absorption band, and then on the basis of the analysis of existing ranging schemes. Several common S-shaped curves are used as empirical formulas for the variation of average oxygen absorptivity with transmission distance. The computational performance and computational complexity of the formulas are considered synthetically, combined with the actual demand of this paper. An empirical formula for the variation of the average absorption rate of oxygen with the radiation transfer distance is proposed and determined. In order to study the relationship between radiative transmission distance and oxygen absorption rate more comprehensively and meticulously, and finally to realize passive ranging, this paper proposes to take the zenith angle and the altitude of observation point as the research object. A three-dimensional model of oxygen absorptivity varying with these two environmental conditions was established at different radiative transmission distances, and then passive ranging was realized. In the process of realizing, when the radiative transfer distance is 5 km10 km-1 20 km-1 35km, through a lot of calculation and fitting, the required 3D curved surface model is established, and finally the five 3D model diagrams are integrated into the same 3D solid. A three-dimensional model of the average oxygen absorption rate varying with the zenith angle and the altitude of the observation point was obtained. On the basis of the established 3D model, the simulation experiment of passive ranging is carried out, and the feasibility of using 3D curved surface model to carry out ranging scheme is verified. The accuracy rate is good, and the relative error of ranging is less than 3%. It provides a new idea for passive ranging based on oxygen absorption characteristics.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：O433;TN97
本文编号：2327838
[Abstract]:In the modern electronic countermeasure environment, with the increasing demand for the precision and attack speed of military equipment, the accuracy and application range of target passive ranging are more and more demanding. With the development of optoelectronic technology, the research on the atmospheric transmission characteristics of infrared target has become more and more in-depth, and the passive ranging method based on the atmospheric transmission characteristics has been paid more and more attention by researchers. Because the proportion of oxygen distribution in the atmosphere is constant, and the interference from other gases is very small near the oxygen A absorption band, the passive distance finding is carried out by using the absorption characteristics of oxygen, and the ranging accuracy is high. The range of ranging is wider under the theoretical framework of oxygen absorption spectrum characteristics. In this paper, the atmospheric infrared transmission model under different transmission conditions is established by using the atmospheric simulation software MODTRAN, and a series of transmission parameters are obtained. The methods of studying the effect of different environmental conditions on the oxygen absorption rate were determined, and the effects of different environmental factors, such as zenith angle, altitude, longitude, latitude, etc., on the oxygen absorption rate in band A were studied respectively. The relationship between oxygen absorption rate and various environmental conditions is clarified, and the empirical formula of oxygen absorption rate changing with different environmental conditions is obtained. On the basis of the analysis and study of oxygen absorption rate changing with different environmental conditions, this paper determines the research range of passive ranging based on oxygen A absorption band, and then on the basis of the analysis of existing ranging schemes. Several common S-shaped curves are used as empirical formulas for the variation of average oxygen absorptivity with transmission distance. The computational performance and computational complexity of the formulas are considered synthetically, combined with the actual demand of this paper. An empirical formula for the variation of the average absorption rate of oxygen with the radiation transfer distance is proposed and determined. In order to study the relationship between radiative transmission distance and oxygen absorption rate more comprehensively and meticulously, and finally to realize passive ranging, this paper proposes to take the zenith angle and the altitude of observation point as the research object. A three-dimensional model of oxygen absorptivity varying with these two environmental conditions was established at different radiative transmission distances, and then passive ranging was realized. In the process of realizing, when the radiative transfer distance is 5 km10 km-1 20 km-1 35km, through a lot of calculation and fitting, the required 3D curved surface model is established, and finally the five 3D model diagrams are integrated into the same 3D solid. A three-dimensional model of the average oxygen absorption rate varying with the zenith angle and the altitude of the observation point was obtained. On the basis of the established 3D model, the simulation experiment of passive ranging is carried out, and the feasibility of using 3D curved surface model to carry out ranging scheme is verified. The accuracy rate is good, and the relative error of ranging is less than 3%. It provides a new idea for passive ranging based on oxygen absorption characteristics.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：O433;TN97
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相关期刊论文 前1条
1 文军,王介民,何淑杰;辐射传输PCModWin程序及应用前景评述[J];遥感技术与应用;1997年04期
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