基于图像叠加的GEO目标探测方法  

A New Method for Detecting GEO Space Objects with Image Stacking

作　　者：孙荣煜[1,2,3] 平一鼎[1,2] 赵长印[1,2] 

机构地区：[1]中国科学院紫金山天文台.南京210008 [2]中国科学院空间目标与碎片观测重点实验室,南京210008 [3]中国科学院研究生院,北京100049

出　　处：《天文学报》2012年第3期249-258,共10页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(11033009,10903030)资助

摘　　要：为了满足地球同步轨道(Geosynchronous Orbit,GEO)空间目标的探测要求,克服长时间曝光CCD像元出现饱和溢出的情况,提出使用多帧连续曝光图像叠加的方法,增加图像的存储范围,同时提升目标的信噪比,保证系统的探测能力.实验结果表明,利用10帧连续图像叠加的方法,可以有效消除像元饱和的情况,提升目标信噪比约3.2倍,提升探测能力近似2.5星等,且序列图像的底片常数精度可靠,用底片常数的均值计算目标位置,精度符合要求.结果验证了使用图像叠加方法探测GEO目标的可行性.To meet the needs of detecting GEO（Geosynchronous Orbit）space objects, and prevent the saturation of CCD pixels with long exposure time,a method of stacking series of images with short exposure time is presented.Using the method,the store range of images is enlarged,and the signal to noise ratio（SNR）is promoted,and hence the detection ability of the whole system is improved.The results of experiments demonstrate that the saturation of pixels is eliminated effectively,and the SNR is increased by 3.2 times,and the detection ability is increased by 2.5 magnitude when 10 seriate images are stacked.The location accuracy of stars satisfies the requirement,and using the mean plate parameters for astronomical orientation is reliable.At last the efficiency of the method is proved.

关 键 词：航天器 技术:图像处理 

分 类 号：P123[天文地球—天体测量]