High-precision spot centroid positioning of high-frame-rate short-wave infrared images for satellite laser communication  

面向卫星激光通信用高帧频短波红外图像的高精度光斑质心定位

作　　者：FU Peng HE Dao-Gang LIU Jun WANG Yue-Ming 付鹏;何道刚;刘军;王跃明(中国科学院大学杭州高等研究院物理与光电工程学院,浙江杭州310024;中国科学院上海技术物理研究所空间主动光电技术重点实验室,上海200083)

机构地区：[1]School of Physics and Optoelectronic Engineering,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China [2]Key Laboratory of Space Active Opto-Electronics Technology,Shanghai Institute of Technical Physics,Chinese Academy of Sciences,Shanghai 200083,China

出　　处：《红外与毫米波学报》2025年第1期66-77,共12页Journal of Infrared and Millimeter Waves

基　　金：Supported by the Short-wave Infrared Camera Systems(B025F40622024)。

摘　　要：The accuracy of spot centroid positioning has a significant impact on the tracking accuracy of the system and the stability of the laser link construction.In satellite laser communication systems,the use of short-wave infrared wavelengths as beacon light can reduce atmospheric absorption and signal attenuation.However,there are strong non-uniformity and blind pixels in the short-wave infrared image,which makes the image distorted and leads to the decrease of spot centroid positioning accuracy.Therefore,the high-precision localization of the spot centroid of the short-wave infrared images is of great research significance.A high-precision spot centroid positioning model for short-wave infrared is proposed to correct for non-uniformity and blind pixels in short-wave infrared images and quantify the localization errors caused by the two,further model-based localization error simulations are performed,and a novel spot centroid positioning payload for satellite laser communications has been designed using the latest 640×512 planar array InGaAs shortwave infrared detector.The experimental results show that the non-uniformity of the corrected image is reduced from 7%to 0.6%,the blind pixels rejection rate reaches 100%,the frame rate can be up to 2000 Hz,and the spot centroid localization accuracy is as high as 0.1 pixel point,which realizes high-precision spot centroid localization of high-frame-frequency short-wave infrared images.光斑质心定位的准确度对系统跟踪精度和激光链路搭建的稳定性有重要影响。在卫星激光通信系统中,采用短波红外波段作为信标光可以降低大气吸收,减少信号衰减。然而,短波红外图像中存在较强的非均匀性和盲元,这使得图像失真从而导致光斑质心定位精度下降。因此,短波红外图像光斑质心高精度定位具有重要的研究意义。本文提出了一种短波红外高精度光斑质心定位模型,对短波红外图像的非均匀性和盲元进行了校正,并量化了二者造成的定位误差;进一步基于模型进行了定位误差仿真,使用最新的640×512面阵InGaAs短波红外探测器,设计了用于卫星激光通信的新型光斑质心定位载荷。实验结果表明矫正后的图像非均匀性由7%降到0.6%,盲元剔除率达到100%,帧频可达2000 Hz,光斑质心定位精度高达0.1像素点,实现了高帧频短波红外图像的高精度光斑质心定位。

关 键 词：satellite laser communication spot centroid positioning short-wave infrared high frame rate NONUNIFORMITY 

分 类 号：TN929.13[电子电信—通信与信息系统]