双镜头镶边处理的“风云四号A星”闪电成像仪在轨几何定标  

An On-orbit Geometric Calibration Approach Based on Double Tubes Edge-binding Feng Yun-4A Lightning Mapping Imager

作　　者：程凯 童晓冲[2] 刘善军[1] 阎晓东[2] 李贺[2] CHENG Kai;TONG Xiaochong;LIU Shanjun;YAN Xiaodong;LI He(School of Resources & Civil Engineering, Northeastern University, Shenyang 110819, China;Information Engineering University, Zhengzhou 450001, China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]信息工程大学,河南郑州450001

出　　处：《测绘科学技术学报》2021年第5期477-484,共8页Journal of Geomatics Science and Technology

基　　金：国家自然科学基金项目(416714409);国家重点研发计划项目(2018YFB0505304)。

摘　　要：风云四号A星FY-4A上搭载的新型闪电成像仪LMI能够从静止轨道高度监测和跟踪覆盖东亚大陆大部分地区的闪电活动。LMI使用双镜头设计,在轨成像过程中存在镜头分离误差与内外定向误差,高精度在轨几何定标是确保FY-4A/LMI数据应用的关键所在。使用在轨匹配的控制数据,采用镶边匹配处理技术将FY-4A/LMI内外定标参数与镶边参数一并求解,纠正FY-4A/LMI两个镜头之间指向上的不一致。实验结果表明,相较于直接定位、使用控制点进行分镜头几何定标,FY-4A/LMI使用双镜头镶边匹配处理算法,在轨几何定标的图像定位精度分别从13像元、2像元提升至1.5像元以内,镶边匹配几何定标方法已被广泛应用于FY-4A/LMI图像定位业务化系统的在轨处理。A new lightning mapping imager(LMI)on-board is carried by FY-4A,which can provide lightning observations and cover a large portion of the East Asian continent from a geostationary altitude.LMI is designed by two tubes,which leads to tube separation errors and the internal and external calibration errors.High accuracy on-orbit geometric calibration is important to ensure the application of FY-4A/LMI imagery.The FY-4A/LMI internal and external calibration parameters and edge-binding parameters are calculated using edge-binding technique with the control data of the on-orbit matching,which is used to correct the inconsistency in the pointing direction between the two FY-4A/LMI tubes.The results show that the effectiveness of the proposed approach when comparing to direct(before calibration)and using control points for geometric calibration of two tubes separately.With this,the image positioning accuracy of on-orbit geometric calibration has been improved from 13 pixels and 2 pixels to 1.5 pixels.The edge-binding geometric calibration method has been applied to the on-orbit processing of the FY-4A/LMI image positioning service system.

关 键 词：静止轨道卫星 风云四号闪电成像仪 在轨几何定标 镶边匹配 面阵相机 

分 类 号：P237[天文地球—摄影测量与遥感]