一种适用于外场条件的红外系统分区域标定方法

A Regionalized Calibration Method of Infrared Systems Suitable for External Field Conditions

为了减小全画幅平均红外标定引起的非均匀性误差,主要探究一种适用于外场条件的红外系统分区域标定方法。首先对增益系数矩阵进行估计,然后利用估计矩阵对标定区域进行划分,最后利用最小二乘法分别对不同区域进行标定,得到增益系数标定矩阵。通过开展大口径地基红外测量系统标定实验,对本文方法进行精度验证。结果表明,与传统方法相比,通过本文方法得到的标定方程进行目标辐射亮度反演时,平均相对误差减小13.07%,平均误差偏离度减小0.2877。该方法对于整个画幅标定精度更高,目标特性反演准确性显著提升,可为红外系统标定的实际工程应用提供有益的参考和借鉴。

In order to reduce the non-uniformity error caused by ful frame average infrared calibration,a segmented calibration method of infrared systems suitable for external field conditions is mainly explored in this paper.In this method,the gain coefficient matrix is estimated first,then the estimation matrix is used to divide the calibration region,and finally the gain coefficient calibration matrix is obtained by using the least square method.The accuracy of the proposed method is verified by carrying out calibration experiment of large aperture ground infrared measurement system.The results show that,compared with the traditional method,the average relative error is reduced by 13.07%and the average error deviation is reduced by 0.2877 when the calibration equation obtained in this paper is used to invert the target radiation brightness.This method has higher calibration accuracy for the whole frame,and the accuracy of the object characteristic inversion is significantly improved.This method can provide useful reference for the practical engineering application of infrared system calibration.