摘要 针对高分辨相机难以实现超宽覆盖的问题,本文设计了锥摆扫一体化成像模式。通过对锥摆扫一体化成像原理进行分析,建立了锥摆扫一体化成像模型;然后,设计了最佳地面轨迹模型,并分析了轨道速度、平台旋转角速度和摆扫转动角速度的关系,并基于地面轨迹给出了曝光时间、帧频的计算方案。最后,通过MATLAB进行算例仿真,并对地面覆盖宽度和地面像元分辨率进行分析。结果表明:在轨道高度为500 km,像素尺寸为2.5μm,焦距为360 mm,像元数为5120×5120时,取相机安装倾角为30°,摆扫成像帧数为10,地面覆盖宽度达到1105.7 km,是星下点推扫成像的31.1倍,并且地面像元分辨率在6.4 m以下。锥摆扫一体化成像模式可以完全覆盖地面目标,并且在保证一定分辨率的条件下大幅增大幅宽。 Achieving super-wide coverage for high-resolution cameras is difficult.To address this difficul⁃ty,this study designs a cone-pendulum scanning integrated imaging mode.First,by analyzing the princi⁃ple of cone-pendulum scanning integrated imaging,a cone-pendulum scanning integrated imaging model was established.Then,the optimal ground trajectory model was designed,and the relationship between the orbital velocity,angular velocity of the platform rotation,and angular velocity of the pendulum scan⁃ning rotation was analyzed.Simultaneously,based on the ground trajectory,a calculation scheme of expo⁃sure time and frame frequency was provided.Finally,MATLAB was used to perform simulations,and the ground coverage width and ground pixel resolution were analyzed.The results show that when the or⁃bital altitude is 500 km,pixel size is 2.5μm,focal length is 360 mm,and pixel number is 5120×5120,then the camera installation angle is 30°,number of frames of pendulum scanning imaging is 10,ground coverage width is 1105.7 km,which is 31.1 times that of the image sub-satellite point push scanning im⁃aging,and ground sample distance(GSD)is less than 6.4 m.The cone-pendulum integrated imaging mode can completely cover the ground target and considerably increase the width for specific resolutions.
出处 《光学精密工程》 EI CAS CSCD 北大核心 2021年第3期536-546,共11页 Optics and Precision Engineering
基金 国家自然科学基金资助项目(No.62075219,No.61805244) 吉林省重点科技研发计划资助项目(No.20190303094SF)。
关键词 空间相机 成像模式 宽幅成像 几何参数 地面轨迹 space camera imaging model wide field imaging geometric parameters ground track
