基于MODTRAN的红外系统作用距离变步长评估算法  

Variable Step Length Operating Range Evaluation Algorithm for Infrared Systems Based on MODTRAN

作　　者：赵一鉴 王茜蒨[1] 宗永红 彭中[1] 胡必强 ZHAO Yijian;WANG Qianqian;ZONG Yonghong;PENG Zhong;HU Biqiang(School of Optics and Photonics,Beijing Institute of Technology,Beijing 100081,China;Beijing Institute of Tracking and Telecommunications Technology,Beijing 100094,China)

机构地区：[1]北京理工大学光电学院,北京100081 [2]北京跟踪与通信技术研究所,北京100094

出　　处：《红外技术》2021年第11期1067-1072,共6页Infrared Technology

摘　　要：在红外成像探测系统的作用距离评估中,要用到大气平均透过率参数,而它又是作用距离的函数,因而一般要用程序循环迭代的方法来计算作用距离。本文介绍了一种针对点目标探测的变步长作用距离评估方法,调用MODTRAN软件计算大气平均透过率和天空背景辐亮度,利用评估模型计算设定距离下的像元个数、信噪比和调制对比度,判断是否满足目标探测所需的最低性能指标,从而确定最大作用距离。在设定值与真实作用距离值相差较大时,采用较大的步长;在设定值与作用距离值相差较小时,采用较小的步长。相比固定步长法,可以在保持计算精度的同时,大大加快计算速度。In the evaluation of the operating range of an infrared imaging detection system,the average atmospheric transmittance is used,which is also a function of the operating range.Therefore,the operating range must be calculated using iteration algorithm.A variable step length method for the operating range evaluation of point target detection is introduced.MODTRAN software is used to calculate the atmospheric average transmittance and sky background radiance.The number of pixels,signal-to-noise ratio,and modulation contrast under the set distance are calculated using the evaluation model to identify whether the minimum performance index required for target detection is satisfied,and consequently determine the maximum operating range.When the difference between the set value and real operating range is large,a large step length is adopted;when the difference is small,a small step length is used.Compared with the const step length method,the proposed algorithm can accelerate the calculation significantly while maintaining accuracy.

关 键 词：红外成像探测系统 作用距离 大气平均透过率 变步长 MODTRAN 

分 类 号：TN215[电子电信—物理电子学]