电子学报 ›› 2005, Vol. 33 ›› Issue (7): 1291-1294.

• 论文 • 上一篇    下一篇

空间太阳望远镜的图象预处理系统研制

王宇舟1,2, 金声震1   

  1. 1. 中国科学院国家天文台,北京 100012;2. 中国科学院研究生院,北京 100039
  • 收稿日期:2004-07-15 修回日期:2005-04-25 出版日期:2005-07-25 发布日期:2005-07-25

Development of Image Pre-processing System for Space Solar Telescope

WANG Yu-zhou1,2, JIN Sheng-zhen1   

  1. 1. National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China;2. Graduate School of the Chinese Academy of Sciences,Beijing 100039,China
  • Received:2004-07-15 Revised:2005-04-25 Online:2005-07-25 Published:2005-07-25

摘要: 空间太阳望远镜太阳磁场测量要求图象的信噪比为104.受CCD满阱电荷的限制,必须对CCD采集到的图象,在预处理单元进行图象积分以提高信噪比;为了减小CCD引入的噪声,还采用了CCD图象改正技术;对于宁静态的长时间太阳观测,为了克服图象漂移导致无法进行图象积分的难题,提出了图象相关内插累加技术,来进一步提高信噪比;预处理单元还担负着偏振测量中的Stokes参数归一计算、CCD控制、调焦控制和图象格式化等任务.文中分析了预处理系统的处理功能需求,确定了系统设计方案;采用FPGA加DSP的硬件结构,制作了地面原理样机,开发了系统软件.在地面支持设备上对系统功能进行了仿真和测试.

关键词: 预处理, 图象积分, CCD图象改正, 相关内插累加, FPGA(Field Programmable Gate Array)

Abstract: Signal-to-Noise Ratio (SNR) requirement of Space Solar Telescope is 104.At the limits of CCD full well electron numbers,in order to improve SNR,the images collected by CCD must be accumulated in pre-processing unit;CCD image correcting technique was adopted to decrease CCD self-noise;In order to solve image drift,images correlative interpolation accumulation method was brought forward to further improve SNR and to meet design requirement.Pre-processing unit also undertakes tasks as following:Stokes parameter calculation during polarization measurement,CCD control,focusing control and image formatting.The requirements of pre-processing unit were analyzed,and system design solution was established.A ground functional prototype was completed according to above scheme with DSP and FPGA as the main chips,and system software was developed.The system function was simulated and testing under ground support equipment.

Key words: Pre-processing, image integral, CCD image correcting, correlative interpolation accumulation, FPGA

中图分类号: