XAO OpenIR  > 研究生学位论文
25米射电望远镜控制与测量软件开发
Alternative TitleControl and measurement software developmentof 25m radio telescope
刘志勇
Subtype博士
Thesis Advisor王娜
2016
Degree Grantor中国科学院大学
Place of Conferral北京
Degree Discipline天文技术与方法
Keyword射电望远镜 控制系统 指向 脉冲星 射电干扰
Abstract射电望远镜控制与测量系统对检验其设计指标、顺利开展天文观测具有非常 重要的意义。任何一套望远镜在正式投入使用前,首先需要建立控制系统、天文 观测系统、望远镜参数测量系统。本论文的研究基于新疆天文台南山25米射电 望远镜(以下简称南山 25 米望远镜)需求,以实际工作为支点,从建立望远镜 指向测量系统,指向测量与改正、脉冲星观测系统升级改造、射电干扰消除等研 究工作中总结经验,期待建立一套分布式的、可扩展的软件架构。 本论文研究工作分三个主要部分,具体内容如下: 第一部分,介绍望远镜控制系统背景与架构设计结果。其中,第一章对射电 望远镜控制系统的基本需求进行描述,概述性的介绍国内外大口径射电望远镜的 控制系统基本框架。第二章分析望远镜控制系统特性、现有控制系统的需求与不 足。深入调研硬件I/O、数据传输效率与吞吐量、接口参数的前后兼容等关键问 题,确定将来南山25米望远镜控制软件所有硬件I/O采用libuv异步库、ZeroMQ 作为软件中间服务层、Protobuf为软件接口参数序列化支持的一种分布式系统软 件架构。 第二部分,介绍望远镜关键参数与测量结果。其中,第三章介绍望远镜的基 本参数定义及常规测量方法。第四章介绍13cm 接收机的安装。对1.3cm接收机 安装精度及效率等参数进行估计,移植IDV观测系统的观测与数据预处理软件 用于指向测量。对安装完以后的接收机,进行指向、系统温度和效率测量。指向 测量结果由于编码器的精度限制,高于理论预期,系统温度、望远镜效率与理论 预期非常吻合。第五章介绍改造以后南山25米望远镜指向测量系统的建立。针 对早期测量方法的不足,对指向测量方法进行改进,开发了指向偏差拟合与指向 模型改正处理软件。对L、S/X、C、K四个波段指向进行了测量与校准,改正后 指向精度远高于1/10波束精度要求。 第三部分,介绍脉冲星观测系统升级改造与数据消干扰算法。其中,第六章 介绍南山25米望远镜脉冲星观测数字消色散系统(PDFB)的实现原理与功能。 改进 PDFB polyco文件生成方式,开发了PDFB 与AFB同时观测控制软件,实 现PDFB自动化观测。该控制软件已经用于新疆天文台、云南天文台脉冲星观测。 第七章,介绍干扰对系统灵敏度的影响及脉冲星观测数据消干扰软件开发。针对 PDFB 观测轮廓的信噪比远不如AFB结果,深入研究射电干扰对系统灵敏度的 影响,总结出存在干扰时的系统灵敏度公式。利用理论推导的公式,开发了针对 窄带脉冲、非脉冲干扰信号的数据消干扰处理软件,有效消除脉冲星观测数据中 的干扰,消干扰效果远优于 paz。该软件已作为新疆天文台、云南天文台脉冲星 消干扰处理的常规软件得到应用。研究了宽频射电干扰消除方法,根据脉冲星信 号色散延迟与射电干扰的特征,通道改正后进行通道交叉相减可以有效的消除宽 频射电干扰。 最后,第八章对上述工作进行总结并对后续研究进行规划。
Other AbstractThe telescope control and measurement system were very important to confirming the design index of radio telescope and carrying out the astronomy observation. Before any radio telescope formally putting into use, it was the first task to building the telescope control, astronomy observation and parameter measurement system. From the experience of these work which included building pointing measurement system, pointing measurement & correction, observation system upgrading and Radio Frequency Interference (RFI) mitigation, the aim of this study was to building a distributed and scalability system architecture at the basis of the need of NanShan 25m Radio Telescope (NSRT) operated by Xinjiang Astronomy Observatory (XAO). The work of this thesis included three parts and the layout of the thesis was as below. In the first part, we introduced the background of radio telescope and the design results of the control system architecture. The first chapter reviewed the basic requirement and the architecture of the radio telescope control system. In the second chapter, we analyzed the requirement and shortage of the existing control system according to the characteristics of the telescope control system. A distributed system software architecture has been proposed after in-depth research hardware I/O, data transmission efficiency and throughput, and the interface parameters design between software. The architecture using library libuv as asynchronous support, ZeroMQ as the control middleware in service layer and Protobuf as the interface parameter serialization. In the second part, we introduced the key parameters of the telescope and the measurement results of the NSRT. The third chapter reviewed the basic definition and generally measurement methods of the parameters of telescope. In the fourth chapter, the installation of 1.3cm receiver is introduced. We estimated the installation accuracy and efficiency of the 1.3cm receiver, and migrated the observation and data preprocessing software of the IDV observation system which was used in measurement. After installation of the receiver, pointing, system temperature and efficiency which were being measured. The result showed that the temperature of the system and the telescope's efficiency are in good agreement with the theoretical expectation, but the blind pointing was higher than the theoretical expectations due to the accuracy of the encoder limit. In the fifth chapter, the establishment of the measurement system of the 25m telescope was introduced. We upgraded pointing measurement method according to the deficiency of the early measurement method, and the software for pointing fitting and pointing model processing were developed. The L, S/X, C and K bands pointing measurement were being carried out and the pointing accuracy was much higher than that of 1/10 beam after using new pointing model. In the third part, we introduced the upgrading of the pulsar observation system and the algorithm of RFI mitigation for pulsar observation data. In the sixth chapter, the generally principle and function of the digital dispersion system (PDFB) for the NSRT was introduced. We improved polyco file generation method, and developed the control software of PDFB and AFB observation at the same time. This control software has been used for the pulsar observation in XAO and YunNan Astronomy Observatory (YNAO). In the seventh chapter, the influence of RFI on the system sensitivity and the development of the RFI mitigation software for the pulsar observation data were introduced. The system sensitivity formula was summarized after in depth study of the influence of RFI. Based on the theoretical derivation of the formula, we developed a software which can effectively mitigate the narrowband pulse and non pulse RFI in the pulsar observation data, and the result was much better than that of paz. This was a very important software for mitigating the RFI of the pulsar observation data and it has been used in XAO and YNAO. We researched the broadband RFI mitigation method. According to the pulse dispersion and RFI characteristics, cross channel subtraction after normalization channel can effectively mitigate the broadband RFI. Finally, the eighth chapter summarized the conclusions in this thesis and proposed some idea for the future work.
Language中文
Document Type学位论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/1720
Collection研究生学位论文
射电天文研究室
Affiliation中国科学院新疆天文台
Recommended Citation
GB/T 7714
刘志勇. 25米射电望远镜控制与测量软件开发[D]. 北京. 中国科学院大学,2016.
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