大口径射电望远镜台站的频谱管理技术

发布时间：2018-01-31 23:02

本文关键词： 电磁频谱管理地形数据路径衰减干扰电平限值　出处：《新疆大学》2017年硕士论文　论文类型：学位论文

【摘要】：电磁频谱管理是保证频谱资源合理有效使用的重要支撑,完善的频谱管理策略能够保证频谱资源的合理利用,避免和消除设备之间的相互干扰。大口径射电望远镜具有极高的系统灵敏度,且台址内外的电磁环境复杂。针对拟建的110m射电望远镜(QiTai radio Telescope,QTT),研究频谱管理技术,提出QTT台站的频谱管理策略,为射电望远镜系统的电磁兼容设计和无线电管理提供重要支持。首先,基于国际电联ITU-R RA.769.2建议书,结合QTT设计的技术指标及科学需求,分析了不同的观测模式下关键参数选取方法,如接收机带宽、观测积分时间,对射电望远镜馈源口面干扰电平限值进行量化。其次,依据QTT台站的航拍图像及高程数据,运用Globe Mapper地形处理软件对台站地形数据进行处理及分析,获取0.18m高精度数值地形数据;建立了基于台址地形的电波传播模型,运用Radio Mobile仿真软件对台址内外关键区域做电波传播仿真分析,预测了台址内外干扰到达射电望远镜的电波路径衰减。最后,依据射电望远镜馈源口面干扰电平限值及电磁波到达射电望远镜的干扰效应,分析了台址内外电磁干扰对射电天文观测的影响,提出了台址内外频谱管理策略。
[Abstract]:Electromagnetic spectrum management is an important support to ensure the rational and effective use of spectrum resources, and a perfect spectrum management strategy can ensure the rational use of spectrum resources. Avoid and eliminate interferences between devices. Large aperture radio telescopes have extremely high system sensitivity. The electromagnetic environment inside and outside the site is complex. The spectrum management technology is studied for the proposed 110m radio telescope, QiTai radio TelescopeTTT. This paper presents a spectrum management strategy for QTT stations, which provides important support for EMC design and radio management of radio telescope systems. Firstly, it is based on the ITU ITU-R RA.769.2 recommendation. According to the technical specifications and scientific requirements of QTT design, this paper analyzes the selection methods of key parameters in different observation modes, such as receiver bandwidth, observation integration time. The interference level limit of the feed surface of radio telescope is quantified. Secondly, according to the aerial images and elevation data of QTT station. Globe Mapper terrain processing software is used to process and analyze the topographic data of the station, and 0.18m high precision numerical topographic data are obtained. The radio wave propagation model based on the site terrain is established, and the simulation analysis of the radio wave propagation in the key area inside and outside the station is done by using the Radio Mobile simulation software. The attenuation of radio wave path from the interference inside and outside the station to the radio telescope is predicted. Finally, the interference level limit of the feed surface and the interference effect of the electromagnetic wave arriving at the radio telescope are discussed. The influence of electromagnetic interference inside and outside the station on radio astronomical observation is analyzed, and the strategy of spectrum management inside and outside the station is put forward.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH751

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