基于制冷型红外系统逐像元标定的空中目标红外辐射亮度计算模型  

Computation Model for Calculating Infrared Radiance of Aerial Target Based on Each Pixel Calibration of Refrigeration Infrared System

作　　者：甘世奇 王伟超 袁光福 武佩剑 吴统邦 Gan Shiqi;Wang Weichao;Yuan Guangfu;Wu Peijian;Wu Tongbang(95859 Army,People s Liberation Army of China,Jiuquan 735018,Gansu,China)

机构地区：[1]中国人民解放军95859部队,甘肃酒泉735018

出　　处：《光学学报》2024年第12期225-232,共8页Acta Optica Sinica

基　　金：国家自然科学基金(51675506)。

摘　　要：基于制冷型红外系统焦平面阵列逐像元标定,提出了一种适用于空中拓展目标的红外辐射亮度计算模型。该模型通过对逐个像元进行单独标定得到整个焦平面阵列的响应增益系数矩阵和偏置矩阵,用于修正空间域上标定系数的非均匀性带来的误差,有效提升对空中拓展目标的红外辐射亮度计算准确度。开展大口径红外面源黑体标定实验和外场验证实验,以对模型的正确性和准确度进行验证。结果表明,与传统方法相比:在不考虑大气测量误差的情况下,所提模型计算的均匀拓展目标辐射亮度的相对误差平均减小8.58%,误差偏离程度平均减小0.60;在考虑大气程辐射和透过率测量误差的情况下,相对误差平均减小7.23%,计算误差偏离程度平均减小2.25,计算结果更接近目标真实值。本文模型可为开展空中目标红外辐射特性测量和理论研究提供有益的参考。Objective The infrared radiation characteristics of the aerial target usually refer to the infrared radiation characteristics of aircraft in the flight state.It is an important combat technique indicator for evaluating the stealth performance of aviation weapons and equipment.Before conducting infrared radiation characteristics testing of aerial targets,infrared calibration is required.The traditional calibration method takes the average response value of the entire infrared detector focal plane array for calibration,without considering the calibration non-uniformity in the image spatial domain,which reduces the calculation accuracy.To improve the calculation accuracy of infrared radiation characteristics,we propose a computation model for calculating the infrared radiance of extended aerial targets,which is based on each pixel calibration of the focal plane array in refrigeration infrared systems.The model obtains the gain coefficient matrix and bias matrix of all focal plane arrays by each pixel independent calibration,which can correct the errors caused by calibration non-uniformity.The computation model can provide references for the measurement and theoretical research on the infrared radiation characteristics of aerial targets.Methods Firstly,each pixel calibration method for refrigeration infrared systems is proposed and the linear relationship between each pixel response value of the infrared focal plane array and the radiation amount of blackbody is established.The calculation formulas of gain coefficient matrix and bias matrix are also derived.Then,we put forward a computation model for calculating the infrared radiance of extended aerial targets based on each pixel calibration of the focal plane array in infrared measurement systems.The model obtains the calculation formula for the infrared radiance of the target by subtracting the sky background gray value from the target gray value and acquires the environmental parameters by adopting atmospheric parameter measurement equipment and MODTRAN software.F

关 键 词：测量 红外标定 辐射亮度 空中目标 计算模型 逐像元 

分 类 号：O432.1[机械工程—光学工程]