摘要
目前空间遥感相机地面标定设备缺乏对各种谱线分布的精确模拟以及无法实现同时进行宽带和窄带的光谱辐射定标,导致空间遥感相机地面辐射定标精度低、宽带和窄带定标过程漫长复杂、无法实现多谱段光谱范围辐射定标测试。针对上述难题,提出一种基于前置准直扩束系统凹柱面光栅的光谱辐射定标系统的设计方法,针对凹柱面光栅的场曲特性,设计了楔形场曲补偿棱镜,并通过准直扩束系统减小系统的成像视场,提高凹柱面光栅分光系统的光谱分辨率,将整个系统的光谱分辨率提升了1倍多,由5 nm提升至2 nm。最后,对系统性能进行了测试,测试结果表明在宽带模式下,实现了500~900 nm光谱范围内3 000 K、6 400 K和9 000 K色温模拟,模拟误差优于5%;在窄带模式下,系统输出光束半峰宽度小于3 nm;在多谱段模式下,等能光谱的光谱模拟误差分别为545~600 nm处1.1%、630~690 nm处2.5%、680~725 nm处1.5%。所设计的系统满足空间相机、姿态导航系统以及遥感仪器的宽带、窄带辐射定标和多功能测试标定需求。
Currently,ground calibration equipment for space remote sensing cameras lacks precise simulation of various spectral line distributions and cannot simultaneously perform both broadband and narrowband spectral radiometric calibration,resulting in low accuracy of ground radiometric calibration for space remote sensing cameras,a long and complex calibration process for both broadband and narrowband,and inability to conduct radiometric calibration tests across multiple spectral ranges.To address these challenges,a design method for a spectral radiometric calibration system based on a concave cylindrical grating with a pre-collimation and beam expansion system.Considering the field curvature characteristics of the concave cylindrical grating,a wedge-shaped field curvature compensation prism is designed.Additionally,the collimating and beam-expanding system is used to reduce the imaging field of view of the system,improving the spectral resolution of the concave cylindrical grating spectroscopic system.This enhancement doubles the spectral resolution of the entire system,from 5 nm to 2 nm.Finally,the system performance is tested.In the broadband mode,the system achieves color temperature simulations of 3 000 K,6 400 K,and 9 000 K within the 500–900 nm spectral range,with a simulation error better than 5%.In the narrowband mode,the half-peak width of the system's output beam is less than 3 nm.In the multispectral mode,the spectral simulation errors for equi-energy spectra are 1.1% in the 545 – 600 nm range,2.5% in the 630 – 690 nm range,and 1.5% in the 680 – 725 nm range.This system meets the requirements for broadband and narrowband radiometric calibration and multifunctional testing and calibration of space cameras,attitude navigation systems,and remote sensing instruments.
作者
刘显著
徐达
李栋
李林
刘石
王宇
郑佳伟
Xianzhu LIU;Da XU;Dong LI;Lin LI;Shi LIU;Yu WANG;Jiawei ZHENG(School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022,China;Space Intelligent Control Laboratory,Beijing 100190,China;Beijing Institute of Control Engineering,Beijing 100190,China)
出处
《航空学报》
EI
CAS
CSCD
北大核心
2024年第19期286-294,共9页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(62105042)
空间智能控制技术实验室开放基金(HTKJ2022KL502004)。
关键词
光谱辐射定标
光谱模拟
凹柱面光栅
辐射分光
光学设计
spectral radiation calibration
spectral simulation
concave cylindrical grating
radiation spectroscopy
opticaldesign
