Radio telescope dimensions for geodetic and astrometric VLBI thermal expansion modelling

Description

The dataset contains the dimensions of structural parts of radio telescopes used for geodetic and astrometric VLBI for the purpose of thermal expansion modelling in geodetic and astrometric VLBI Level-2 data analysis. The 2025-02-21 version is the pre 2025-01-21 version for ITRF2020-u2025.

Context and methodology

The dataset  belongs to publication: Axel Nothnagel (2009) Conventions on thermal expansion modelling of radio telescopes for geodetic and astrometric VLBI; Journal of Geodesy, Vol. 83(3), 787-792, DOI: 10.1007/s00190-008-0284-z where the general concept of thermal expansion modelling is described.

The data was collected from on-site personnel who measured the dimensions of the structural parts or extracted them from construction drawings.

Technical details

The data is stored in fixed format ASCII with the data of each telescope in a single line. The format is described in the header of the file. 

No special software is needed to read and use the data.

数据集说明
本数据集收录用于大地测量与天体测量甚长基线干涉测量（Very Long Baseline Interferometry, VLBI）的射电望远镜结构部件尺寸数据，服务于大地测量与天体测量VLBI二级数据分析中的热膨胀建模工作。本次发布的2025-02-21版本为针对国际地面参考框架2020-u2025（International Terrestrial Reference Frame, ITRF2020-u2025）的2025-01-21预发布版本。

背景与方法
本数据集源自以下学术文献：Axel Nothnagel（2009）《用于大地测量与天体测量VLBI的射电望远镜热膨胀建模规范》，刊载于《大地测量学报》（Journal of Geodesy）第83卷第3期，页码范围787-792，DOI：10.1007/s00190-008-0284-z，该文献系统阐述了热膨胀建模的通用概念。
数据集的原始数据由现场工作人员通过实测射电望远镜结构部件尺寸，或从施工图纸中提取相关参数采集获得。

技术细节
本数据集采用固定格式ASCII存储，每台望远镜的对应数据单独占一行。文件头部已对该数据格式进行完整说明，无需专用软件即可读取并使用本数据集。