延展目标的斑点干涉复原方法研究
文献类型：学位论文
| 作者 | 李妍 |
| 学位类别 | 硕士 |
| 答辩日期 | 2008-06-11 |
| 授予单位 | 中国科学院上海天文台 |
| 授予地点 | 上海天文台 |
| 导师 | 唐正宏 |
| 关键词 | 斑点成像 相位屏 延展目标 滤波器 |
| 其他题名 | Research of Reconstruction Methods of Extended Objects from Their Speckle Images |
| 中文摘要 | As a post-processing method to overcome atmospheric turbulence effects, reconstruction technique of speckle imaging has been shown to mitigate atmospheric-resolution limits effectively, allowing near diffraction-limited images to be reconstructed. For its easy achievement, reconstruction of speckle imaging has been widely used in the observational research of binary stars and good results have been achieved. In this paper, we will mainly compare the results from various reconstruction methods of speckle imaging, and we will discuss how to choose an optimal method to yield reconstruction of extended objects. We hope to do pre-research of shape recognition of satellite using speckle imaging technique on 1.56-m telescope. Our aim is to find a way to exert the advantage of its large aperture and avoiding the influence of bright sky-background at night. In this paper, methods and applications of speckle imaging technique have been introduced. We simulate the phase screen of atmospheric turbulence and speckle images. Reconstruction of the point object has been achieved using both simulated data and observational data. From the results, the programs are validated. We mainly discuss the merits and drawbacks of ISA, DSA and FISA for reconstruction of extended objects. From the results of different SNRs, some detailed explanations of pre-process and choice of filter are given, too. We emphasize the importance of pre-process and choice of filter, and explain the influence of them on reconstruction of speckle imaging. |
| 英文摘要 | 斑点成像技术是克服大气湍流影响，提高地面大口径望远镜分辨率本领的有效途径之一，已经在天文观测上得到了广泛的应用。本文试图通过对比各种复原方法，找出对延展目标复原的行之有效的方法。 我们希望在1.56米望远镜上开展高分辨率成像观测，以测定人造卫星的形状，为1.56米找到一个既能充分发挥其大口径优势，又不受佘山站较亮夜天空背景影响的课题。 本文介绍了斑点干涉高分辨率成像的方法原理及应用领域，并且模拟了湍流大气的相位屏，用生成的相位屏模拟了目标的短曝光像。分别用模拟和实测的点源目标进行了复原，进而验证了程序。重点用模拟数据对延展目标进行了复原试验，对比了ISA，DSA，FISA等方法的优缺点。并且针对不同信噪比下的复原结果进行了讨论。对不同方法的预处理过程和滤波器的选择进行了比较详尽的解释，阐述了预处理和滤波器选择的重要性，以及其对斑点成像复原结果的影响。 |
| 语种 | 中文 |
| 公开日期 | 2011-07-01 |
| 页码 | 56 |
| 源URL | [http://119.78.226.72//handle/331011/14700]  |
| 专题 | 上海天文台_中国科学院上海天文台学位论文 |
| 推荐引用方式 GB/T 7714 | 李妍. 延展目标的斑点干涉复原方法研究[D]. 上海天文台. 中国科学院上海天文台. 2008. |
入库方式： OAI收割
来源：上海天文台
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