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低纬子午环控制系统及数据预处理系统的研究
Alternative TitleStudies on Control Systems and Data Pre-processing Systems in the Lower Latitude Meridian Circle (LLMC)
李彬华
Subtype博士
Thesis Advisor昌蔚
2002
Degree Grantor中国科学院研究生院(云南天文台)
Place of Conferral北京
Degree Discipline天文学
Keyword天体测量 子午环 控制系统 数据处理
Abstract本学位论文的研究目的是使低纬子午环配备科学CCD的方案得以实现。文中详细讨论了低纬子午环配备CCD后的方位、高度和CCD跟踪这三个传动控制系统的基本要求,指出了原系统中存在的问题,提出了相应的解决方案,成功地在硬件和软件两个方面改进了前两个控制系统并实现了后一个控制系统。文中介绍了调试期间所用的基于视频CcD的数据采集系统,特别指出了作者对该系统所作的改进和完善之处。文中对基于视频CCD的数据预处理系统作了详尽的描述。在仔细分析了低纬子午环上九路Reticon信号的特点之后,作者提出了处理这九路Reticon信号的新方法,它包括刻线/狭缝像的搜索算法、自估计滤波算法和单波峰定心算法,该方法为低纬子午环进行高精度测量提供了一个最基本的保证。文中讨论了低纬子午环配备科学CCD后数据采集系统的基本要求,提出了分三个子系统的解决方案,并成功地在硬件和软件方面实现了每一个子系统,还对基于科学CCD的数据预处理系统作了详尽的描述。在仔细分析了天文CCD图像的特点后,作者提出了适合于低纬子午环要求的CCD图像处理方法,该方法能自动处理大量的CCD图像以及图像中大量的观测目标。其中的自动搜索算法、定心算法和视星等的计算方法具有鲜明的特点。文章最后介绍了低纬子午环的测试系统及对其改造、充实和完善,与原系统相比,新的测试系统在功能和实用性方面有着明显的优点。
Other AbstractThe purpose of our studies in this thesis is to accomplish a project of the LLMC equipped with a scientific CCD. Some basic requirements for an azimuth, a vertical angle and a CCD tracking transmission control .system after the CCD is attached to the LLMC are discussed in the thesis. Problems in the original systems are pointed out, and corresponding solutions for the problems are proposed. The former 2 control systems are improved and the last is implemented successfully in both hardware and software. A data acquisition system based on a video CCD used in the experiment and adjustment of the telescope is introduced, and some improvements on the system made by author are specially pointed out. A data pre-processing system based on the video CCD is described in detail. After the functions and characteristics of the 9 Reticon signals are anatomized, a new method used to process these Reticon signals is presented, which consists of a reticle/slit image searching algorithm, a self-estimation filtering algorithm and a single wave centering algorithm. The method provides the high precision measurement of the LLMC with a fundamental condition. After some basic requirements for the data acquisition system based on the scientific CCD are discussed, a solution including 3 sub-systems is proposed. Each sub-system is implemented successfully in both hardware and software. The data pre-processing system based on the scientific CCD is also described in the thesis. After the characteristics of the astronomical CCD image are dissected, a method meeting requirements of the LLMC is presented, which can automatically process many CCD images and observational objects in the images. In the method, an object searching algorithm, a centering algorithm and an algorithm to determine visual magnitude of objects have some distinctive features. A new test system in the LLMC is described in the last. Compared with the original system, the new one has many obvious advantages in the functions and the practicability.
Subject Area天文学
Pages120
Language中文
Document Type学位论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6751
Collection天体测量及应用研究组
Recommended Citation
GB/T 7714
李彬华. 低纬子午环控制系统及数据预处理系统的研究[D]. 北京. 中国科学院研究生院(云南天文台),2002.
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