摘要
星载成像光谱仪的高精度反演计算需要正确的估算光谱通道获取信号的能力。针对星载光谱仪光谱通道能量弱,空间背景辐射及杂光强的特点,重新讨论了信噪比模型。新信噪比模型考虑了空间光环境对光谱仪信号通道的影响。针对某型号星载成像光谱仪,使用大气辐射传输软件MODTRAN的大气参数进行了各光谱信道的信噪比计算。同时,充分考虑了大气光环境的影响因素。仿真结果表明,相比于传统信噪比计算模型,实际星载光谱仪在短波光谱获取图像信息时存在更严重的退化现象,即信噪比严重降低。并且随者太阳高度角增加以及大气能见度距离下降,加剧了退化趋势。
High-precision inversion calculation of space-borne imaging spectrometer requires accurate estimation of spectral channel ability to obtain signals. In view of the weak spectral channel energy,strong spatial background radiation and stray light energy of space-borne imaging spectrometer,the signal-to-noise ratio (SNR) model is discussed again in this paper. The influence of the spatial light environment on the signal channel of the spectrometer is considered in the new SNR model. The SNR of each spectral channel is calculated by using the atmospheric parameters of the atmospheric radiation transfer software MODTRAN for a space-borne imaging spectrometer. At the same time,the influence factors of atmospheric light environment are fully considered. The simulation results show that compared with the traditional SNR calculation model,the actual space-borne imaging spectrometer has a more serious degradation phenomenon at short wave spectrum,that is,the SNR is seriously reduced. Moreover,with the increase of solar altitude angle and the decrease of visibility distance,the degradation trend is aggravated.
作者
李博瀚
欧阳名钊
王志勇
LI Bohan;OUYANG Mingzhao;WANG Zhiyong(School of Optoelectronic Engineering,Changchun University of Science and Technology,Changchun 130022;Logistics department of Aviation University of Air Force,Changchun 130022)
出处
《长春理工大学学报（自然科学版）》
2019年第2期9-13,共5页
Journal of Changchun University of Science and Technology(Natural Science Edition)
基金
国家重点研发计划(2016YFF0101902)
吉林省科技发展计划(20180201028GX)
关键词
信噪比
星载成像光谱仪(SBIS)
大气辐射传输
散射杂散光
signal-to-noise ratio
space-borneimaging spectrometer (SBIS)
atmospheric radiation transmission
scatter stray light
