中短波红外恒星定标点扩散函数求解及精度分析

发布时间：2018-05-29 20:24

本文选题：点目标 + 恒星定标　；参考：《遥感技术与应用》2017年01期

【摘要】：遥感器在轨绝对辐射定标能够实时评价传感器本身的辐射响应特性,及时发现并正确纠正传感器辐射响应变化。以恒星观测数据作为辐射定标参考源,点扩散效应使探测系统所接收的像与实际点光源分布存在较大差异。因此,要从获得的像中还原出点目标真实情况,就必须知道探测系统的点扩散函数。以高斯函数模拟系统点扩散函数,采用最小二乘法求解点目标相对于瞬时视场偏移,并提出了亚像元尺度上求解系统点扩散函数的新方法。模拟实验结果表明:该方法对点扩散函数分布计算精度较高(优于0.01%),且当探测系统能量集中度低于77%(MTF0.50.37)时,以恒星为目标的在轨绝对辐射定标方法可以满足5%的精度要求。
[Abstract]:The absolute radiation calibration of the remote sensor in orbit can evaluate the radiation response characteristics of the sensor itself in real time and correct the radiation response of the sensor in time. Using star observation data as the reference source of radiometric calibration, the distribution of the image received by the detection system is different from that of the actual point light source. Therefore, in order to restore the real situation of the point target from the obtained image, we must know the point diffusion function of the detection system. The Gao Si function is used to simulate the point diffusion function of the system, and the least square method is used to solve the point object migration relative to the instantaneous field of view. A new method for solving the point diffusion function of the system on sub-pixel scale is proposed. The simulation results show that the accuracy of the method for calculating the distribution of point diffusion function is higher (better than 0.01 and the energy concentration of the detection system is lower than 77um MTF 0.50.37), and the absolute radiometric calibration method with stars as the target can meet the accuracy requirement of 5%.
【作者单位】：中国气象科学研究院;国家卫星气象中心;
【基金】：国家自然科学基金项目“基于月球观测的静止气象卫星热发射波段辐射定标与精度评估”(41275034);国家自然科学基金项目“空间信息网络体系架构及其在气象灾害研究中的应用”(91338203)
【分类号】：TP732

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