太阳耀光偏振参数星上计算系统设计  

Design and implement of a space-borne sun glint polarization parameter computing system

作　　者：李宇豪 纪峰[1] 裘桢炜 陈斐楠 厉卓然 池杲鋆 陈晶晶[1] 胡亚东[2] 李孟凡 Li Yuhao;Ji Feng;Qiu Zhenwei;Chen Feinan;Li Zhuoran;Chi Gaojun;Chen Jingjing;Hu Yadong;Li Mengfan(School of Instrument Science and Opto-Electronics Engineering,Hefei University of Technology,Hefei,Anhui 230009,China;Anhui Institute of Optics and Fine Mechanics,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei,Anhui 230031,China)

机构地区：[1]合肥工业大学仪器科学与光电工程学院测量理论与精密仪器安徽省重点实验室,安徽合肥230009 [2]中国科学院合肥物质科学研究院安徽光学精密机械研究所,安徽合肥230031

出　　处：《光电工程》2024年第4期52-62,共11页Opto-Electronic Engineering

基　　金：装备预研项目基金资助项目(305090306);江淮前沿技术协同创新中心追梦基金课题资助项目(2023-ZM01K011)。

摘　　要：太阳耀光影响光学遥感成像质量,可采用在探测器前加装偏振片的方式进行抑制,抑制效果取决于太阳和遥感器的相对位置以及偏振片的偏振方向。为实时准确地获取太阳耀光偏振信息,本文在星载大气校正仪上设计了一套星上太阳耀光偏振参数计算系统,利用大气校正仪670 nm波段的0°,60°,120°三个通道偏振图像实时计算耀光参数,并使用基于6S大气辐射传输模型的耀光参数建立晴空海洋偏振双向反射分布函数查找表,排除受云干扰的图像像元,最后利用实时探测数据进行高精度太阳耀光偏振方位角计算。系统以V5系列的现场可编程门阵列为计算平台,使用高层次综合工具进行算法的硬件实现,并在实验室内进行了实验验证。实验结果表明,系统计算偏振角误差与真实值相比在0.5°以内,在100 MHz主频时钟下一组25×25像元的数据计算时间消耗为19.47281 ms,FPGA资源使用率为41%。Sun glint is a significant confounding factor in passive optical remote sensing images.To mitigate this issue,a polarizer is typically incorporated in front of the remote sensor,leveraging the linear polarization characteristics of sun glint.The suppression effects depend on the relative position of the sun and the remote sensor,as well as the directions of polarizers.In this paper,we introduce a novel onboard system for the real-time computation of Sun glint polarization parameters,devised specifically for a spaceborne atmospheric correction instrument.Utilizing three channel polarization images(at 0°,60°,and 120°)in the 670 band of the spaceborne atmospheric correction,we calculate the sun glint parameters and compared them against the 6S radiation transfer model,excluding image pixels heavily influenced by the could.The system is implemented using the V5 series Field Programmable Gate Array(FPGA)as the hardware platform,and the High-Level Synthesis Tool(HLS)as the software platform.The performance of the system is verified through a simple laboratory experiment,which demonstrates a calculation deviation within 0.5°.In terms of computational efficiency,the system processes a 25x25 pixel dataset in 19.47281 ms using a 100 MHz clock,with the highest resource utilization rate reaching 41%.

关 键 词：太阳耀光 现场可编程门阵列 偏振测量 硬件加速 

分 类 号：O436[机械工程—光学工程]