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遥感传感器的辐射定标是遥感信息定量化的基础和前提条件.本文提出了一种基于灰阶靶标的遥感传感器室外相对辐射定标方法.该方法采用“两个替代”的思想,利用太阳光代替积分球光源,利用灰阶靶标代替漫反射板,在室外获取多个辐亮度等级的图像,利用最小二乘法拟合得到相对辐射定标系数.本方法的特点在于:第一,与实验室定标方法相比,大大简化了定标方法的复杂性和降低实验成本;第二,与以往的单一辐亮度室外定标方法相比,多个辐亮度等级的实验图像大大降低了定标的误差;第三,操作简便,对环境条件要求较低,在航空传感器的飞行前后快速定标中具有独特的优势,实用性强.本文从理论和实验角度证明了该方法的可行性.使用该方法对一种宽视场多光谱相机进行了定标实验,通过评价校正后影像上地面布设的大面积均匀靶标的像素一致性,给出了相对辐射定标精度.实验结果表明,该方法有效可行,精度满足进一步的传感器绝对辐射定标要求.
Radiometric calibration of remote sensing sensor is the basis and prerequisite for the quantification of remote sensing information.This paper presents a method for outdoor relative radiation calibration of remote sensing sensor based on gray-scale target.This method adopts the idea of “two alternatives” The sunlight replaces the integrating sphere light source, the gray scale target is used instead of the diffuse reflection plate, the images of multiple radiance levels are obtained outdoors, and the relative radiation scaling coefficient is obtained by using the least square method fitting method.The features of the method are as follows: Compared with the laboratory calibration method, greatly simplifying the complexity of the calibration method and reducing the experimental cost; second, compared with the previous single radiance outdoor calibration method, the experimental images of multiple radiance levels greatly reduced Thirdly, it has the advantages of simple operation and low requirements for environmental conditions, and has unique advantages in rapid calibration before and after the flight of airborne sensors.It is proved that the method is feasible from both theoretical and experimental standpoints. Using this method, a wide field multi-spectral camera was calibrated. By evaluating the pixel uniformity of a large area uniform target arranged on the ground on the corrected image, the relative Exit calibration accuracy. The experimental results show that this method is effective and feasible, a further sensor accuracy satisfies the absolute radiometric calibration requirements.