Changchun Institute of Optics,Fine Mechanics and Physics,CAS
Automatic on-orbit adjusting gains of space camera based on lighting conditions | |
Wu X.; Liu J.; Zhou H.; Zhang B. | |
2014 | |
发表期刊 | Guangxue Xuebao/Acta Optica Sinica |
ISSN | ISBN/02532239 |
卷号 | 34期号:3 |
摘要 | During the imaging process of space camera, small fixed gains are often used to avoid image saturation. As a result, obtained images have problems such as dark as a whole, short of digital number levels. An automatic on-orbit adjusting gains method of space camera based on lighting conditions is put forward. In this method sun zenith angle at substellar point is calculated in real time according to current position of spacecraft and time. Function relationship between sun zenith angle and radiance at entrance pupil of space camera corresponding to maximum reflection index of targets is established by non-linear curve fitting. In this way real-time calculation and adjustment of gains are realized. Results of contrastive experiment with results of simulation by satellite tool kit (STK) and computation by MODTRAN indicate that radiance fitting errors are no more than 0.3 W/(m2sr) as sun zenith angle belongs to [20, 70]. Relative errors are no more than 2.2%. Difference error between calculated sun zenith angles and those simulated is about 0.39(3). Results of on-orbit imaging experiments indicate that digital number levels are improved from 98 to 183 and entropies are improved about 19.2% after adjusting of gains as sun zenith angle is 62.5. Targets will be easier to be recognized as more digital number levels can be obtained. |
收录类别 | EI |
语种 | 中文 |
文献类型 | 期刊论文 |
条目标识符 | http://ir.ciomp.ac.cn/handle/181722/43763 |
专题 | 中科院长春光机所知识产出 |
推荐引用方式 GB/T 7714 | Wu X.,Liu J.,Zhou H.,et al. Automatic on-orbit adjusting gains of space camera based on lighting conditions[J]. Guangxue Xuebao/Acta Optica Sinica,2014,34(3). |
APA | Wu X.,Liu J.,Zhou H.,&Zhang B..(2014).Automatic on-orbit adjusting gains of space camera based on lighting conditions.Guangxue Xuebao/Acta Optica Sinica,34(3). |
MLA | Wu X.,et al."Automatic on-orbit adjusting gains of space camera based on lighting conditions".Guangxue Xuebao/Acta Optica Sinica 34.3(2014). |
条目包含的文件 | 下载所有文件 | |||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
基于光照条件的空间相机增益在轨自动调整_(320KB) | 开放获取 | CC BY-ND | 浏览 下载 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
谷歌学术 |
谷歌学术中相似的文章 |
[Wu X.]的文章 |
[Liu J.]的文章 |
[Zhou H.]的文章 |
百度学术 |
百度学术中相似的文章 |
[Wu X.]的文章 |
[Liu J.]的文章 |
[Zhou H.]的文章 |
必应学术 |
必应学术中相似的文章 |
[Wu X.]的文章 |
[Liu J.]的文章 |
[Zhou H.]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论