摘要
天基光学监测系统是态势感知的重要内容。通过分析星空场景下面目标的光电成像过程,在面目标成像的基础上设计了天基空间目标场景成像仿真系统,并提出了一种根据卫星表面所用材料的双向反射分布函数(BRDF)特性改进二次反射光线抽样范围的方法。根据太阳电池板材料和聚酰亚胺膜两种材料的反射分布,确定了顶角为10°和15°的光线集中区域用于蒙特卡罗抽样。目标成像模块包含实时和高质量两种模式。当选择实时成像模式时,所设计系统直接调用OpenGL管线进行渲染,实现了35 Hz以上的成像频率;当选择高质量成像模式时,采用改进二次抽样的光线追踪方法进行成像,成像效果逼真、阴影显示正确。在星空背景下,使用所设计系统对空间目标的成像和监测进行了仿真,研究结果可为天基光学相机的设计提供一定参考。
Spacebased optical monitoring system is a critical component of situational awareness.By analyzing the photoelectric imaging process of the target under the starry sky scene,the spacebased space target scene imaging simulation system is designed based on surface target imaging,and a method is proposed for increasing the sampling range of secondary reflected light according to the bidirectional reflectance distribution function(BRDF)properties of the materials used on the satellite surface.Using the reflection distribution of solar panel material and polyimide film,the light concentration areas with vertex angles of 10°and 15°were determined for Monte Carlo sampling.The target imaging module includes two modes:realtime and highquality.When the realtime imaging mode is selected,the designed system directly contacts the OpenGL pipeline for rendering and obtains an imaging frequency of over 35 Hz.When the highquality imaging mode is enabled,the image is captured using the improved twicesampled raytracing technique.The imaging effect is accurate,as is the shadow display.The imaging and monitoring of space targets are simulated by using the designed system against a background of stars,which can serve as a certain reference for the design of a spacebased optical camera.
作者
杨晋生
李天骄
Yang Jinsheng;Li Tianjiao(School of microelectronics,Tianjin University,Tianjin 030072,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2022年第8期243-250,共8页
Laser & Optoelectronics Progress
基金
北京市优秀人才资助计划青年拔尖项目(2016000026833ZK08)。
关键词
成像系统
成像仿真
天基光学系统
蒙特卡罗
实时成像
高质量成像
imaging systems
imaging simulation
spacebased optical system
Monte Carlo
realtime imaging
highquality imaging
