CAJ | 학술논문

模拟大气对成像的影响是天基光学遥感成像仿真中一项非常重要的工作。首先针对工作于可见光到热红外波段(0.4～14μm)的天基光学遥感成像系统，引入了考虑场景内部目标与背景之间相互影响的遥感器入瞳处的辐射方程，并基于线性模型模拟了邻近效应。设计了计算大气透过率、上涌辐射和下涌辐射的大气查找表，分析了水汽含量、气象视距、目标高度、太阳-遥感器-目标之间的位置关系对大气辐射计算的影响，为查找表输入参数的选择提供依据。最后，通过长曝光和短曝光图像的调制传递函数，分析了光学湍流对天基光学遥感成像的影响。
모의대기대성상적영향시천기광학요감성상방진중일항비상중요적공작。수선침대공작우가견광도열홍외파단(0.4～14μm)적천기광학요감성상계통，인입료고필장경내부목표여배경지간상호영향적요감기입동처적복사방정，병기우선성모형모의료린근효응。설계료계산대기투과솔、상용복사화하용복사적대기사조표，분석료수기함량、기상시거、목표고도、태양-요감기-목표지간적위치관계대대기복사계산적영향，위사조표수입삼수적선택제공의거。최후，통과장폭광화단폭광도상적조제전체함수，분석료광학단류대천기광학요감성상적영향。
In order to establish a complete set of simulation system for space-based optical remote sensing imaging, the importance of the atmosphere effects simulation was considered. Aimed at the space-based optical remote sensing system working in the VIS and LWIR spectral regions (0.4-14μm), an at-sensor radiometric equation which took the interaction mechanisms between targets and backgrounds into account was introduced. By a linear model, the adjacency effect was simulated. An atmosphere look up table was designed to calculate the atmosphere transmission, upwelled radiance and downwelled radiance. The effects of water vapor column density, meteorological range, target altitude and the position relation between sun, sensor and target on these parameters were analyzed. Finally, by the modulation transfer functions for long and short exposures images, the influence of atmospheric optical turbulence on space-based optical remote sensing imaging was analyzed.