面向GWAC系统的流星候选体识别算法  

An Algorithm of Selection of Meteor Candidates in GWAC System

作　　者：徐洋[1,2] 王竞 黄茂海[1,2] 魏建彦 Xu Yang;Wang Jing;Huang Maohai;Wei Jianyan(Key Laboratory of Space Astronomy and Technology,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;University of Chinese Academy of Sciences,Beijing 100049,China;Guangxi Key Laboratory for Relativistic Astrophysics,School of Physical Science and Technology,Guangxi University,Nanning 530004,China)

机构地区：[1]中国科学院国家天文台空间天文与技术重点实验室,北京100101 [2]中国科学院大学,北京100049 [3]广西大学物理科学与技术学院广西相对论天体物理重点实验室,广西南宁530004

出　　处：《天文研究与技术》2019年第4期478-487,共10页Astronomical Research & Technology

基　　金：中国科学院空间科学战略性先导科技专项(XDA15052600);中国科学院战略性先导科技专项(B类)(XDB23040000)资助

摘　　要：地基广角相机阵的超大视场每天可观测数百个流星体,有效识别这些流星体可以为流星的科学研究提供重要的科学数据。针对地基广角相机阵这一类超大视场测光巡天系统在流星识别时遇到的不能有效区分流星与其他移动目标的问题,设计和实现了一个流星候选体识别算法,该算法主要包含流星轨迹识别和光变曲线形态分析两部分。识别算法对Mini-GWAC约两个月的图像进行处理,提取10.9万个移动目标轨迹,其中90%以上属于非流星目标。分析午夜时间段内流星目标高斯拟合曲线的α参数,发现大部分单峰流星目标的光变曲线波峰随图像像素位置呈慢速变化趋势。综合流星的单帧特性、光变曲线的单峰结构特征和光变曲线的慢速变化特性进行过滤,最终得到4.1%的高精度流星候选体。经过人工检查确认,4.1%的流星候选体中有85%~87.3%的目标符合流星的形态及亮度特征。With its large field of view,GWAC can record hundreds of meteors every day.These meteors are valuable treasures for some meteor research groups.It is therefore very important to accurately find all of these meteors.To address the challenge of precisely distinguishing meteors from other elongated objects in a GWAC-like sky survey system,we design and implement a meteor candidate recognition algorithm,including the recognizing and morphology analysis of the light curves of the meteor candidates.After processing the images of Mini-GWAC taken in two months,we detect 109000 elongated objects in which more than 90 percent of objects are not meteor.By analyzingαparameter of gaussian fitting curve of meteor target in midnight,we find that the wave crest of most single-peak meteor target changes slowly with the position of image pixel.Among the elongated objects,about 4.1%objects are identified as meteors with high confidence,after applying filters based upon an existence in a single frame,a single peak in the light curves,and a slow variation of the light curves.After manual examination,85%-87.3%of the 4.1%candidates are consistent with the shape and brightness of the meteor.

关 键 词：流星 拉长轨迹识别 光变曲线 形态分析 地基广角相机阵 

分 类 号：TP311.1[自动化与计算机技术—计算机软件与理论]