光学遥感成像系统全链路仿真框架研究

针对光学遥感成像系统的全链路仿真在我国刚刚起步。通过分析能量在大气、场景和遥感器之间传递时发生的各种相互作用，将整个仿真过程分为三维场景构建与组织、遥感器入瞳处辐亮度图像模拟、遥感器效果模拟三部分，分析了框架中各个模块的功能和模块之间的概念数据流向。最后分析了地形起伏和观测角度变化对成像的影响，计算显示：像元高度从0增至1 km时，入瞳处辐亮度的最大相对差异可达170%；观测天顶角分别从180°变为124.4°时，辐亮度的相对差异最大可接近50%。

Framework of entire image chains simulation for optical remote sensing images system

The entire image chains simulation for the optical remote sensing images system is still at the starting stage in China. By analyzing the interactions between the atmosphere, the scene and remote sensor, imaging process is divided into three parts: the construction and organization of 3D scene, the simulation of the at-sensor radiance images and simulation of the sensor effects. The functions of each module and conceptual data flow among these modules are analyzed briefly. At last, the effects of terrain fluctuations and the view zenith angle on imaging are discussed. The results show that with the increase in pixels height from 0 to 1 km, the relative errors of the radiance at-sensor can reach 170%. And the maximum relative error of the radiance at-sensor is close to 50% with the change of the view zenith angles from 180° to 124.4°.