星载可见光相机成像仿真建模研究

Research on Remote Sensing Image Generation Modeling in the Visible Regions

针对星载可见光相机成像模拟在逼真度和灵活性方面的综合仿真应用需求,研究并提出了一种以三维场景为基础,以光线追踪技术为主要渲染核心,综合考虑卫星轨道和姿态、光照条件、物体光谱特性和周边环境、大气传输、遥感器成像性能等影响因素的全光路成像模拟技术的仿真模型.文中首先从完备性及可扩展性的角度尝试建立了成像仿真系统的综合模型框架,对整个成像链中的各个重要环节进行分层及模块化,并结合目前现有三维技术、光线追踪技术、传感器仿真技术的特点设计各模块之间的调用及接口关系,使其能在较好利用现有计算模型的同时能够对新的算法模型实现有效兼容.随后讨论了模型目前使用的镜头前辐亮度计算模块、光线路径计算模块和传感器效果仿真模块,并针对简单空间探测场景用C++编程语言实现了系统框架和关键模型,生成模拟图像,结果证明该模型在深空光照及大气效果方面有较好的表现,具备较高的仿真度和良好的适应性、扩展性,能够有效支撑卫星光学成像系统的指标论证、算法评估以及效能预估等应用.

This paper addresses the research of fidelity and flexibility of remote sensing image generation modeling and simulation,and presented a synthetic image generation model which deals spectrally with multifold effects base on a three dimension digtial geometric scene and ray-tracing render engine.At first this paper tried to set up the imaging simulation system from the completeness and expansibility angle by stratifing and modularizing each important factor of whole imaging chain.In order to effectively utilize existing calculation model and able to interoperate for the new algorithm model,the call and communication relations between each module is designed by combining existing 3d technology,light tracing technology,sensor simulation technology.And the radiance calculation module,the ray tracing calculation module and sensor effect simulation module were discussed.Then aimed at a space scene simulation application.The model framework,submodels and spectral image examples achieved by C＋＋ programming language are presented which can be widely use in sensor prototyping,algorithm testing,efficiency assessment at satellite design phase.