VLBI超宽带时延测量方法研究

国际测地与天体测量VLBI服务（IVS）提出的“VLBI全球观测系统”（VGOS）正在实施中，该系统的时延测量精度将比目前的S/X双频观测系统提高1个量级。本课题依托上海相关处理机系统，针对我国VGOS台站建设现状和国际VGOS计划的快速推进，研究超宽带观测纲要的设计方法，发展超宽带干涉测量模型算法，建立高精度的超宽带时延提取算法，利用国内外VGOS台站，开展超宽带条纹测试和观测实验，完成相关处理，致力于获取高精度的VLBI超宽带时延观测量。课题成果直接为建设我国新一代测地VLBI观测网服务，满足VGOS观测站条纹检测的需要，满足我国VLBI网开展独立自主的天体测量与大地测量应用研究的需要，满足上海相关处理机承担更多国际VGOS观测网的数据处理需要。

The VLBI Global Observing System (VGOS) proposed by the International VLBI Service for Geodesy and Astrometry (IVS) has been underway. It is aimed at providing broadband delay observables at the level of 4 ps which is 10 times better than that of the currently used S/X dual band system. With the advances of construction of VGOS antennas in China and abroad, we will upgrade the Shanghai VLBI Correlator by conducting research on the broadband observing schedule, interferometric algorithm and broadband delay extraction. Hence, we can perform fringe tests and trial experiments with VGOS stations in China and obtain broadband delay observables with very high precision. As a result the Shanghai Correlator will contribute to the establishment of Chinese new generation geodetic VLBI network for fringe tests and scientific observations. Furthermore, it is also able to correlate more international VGOS observational data in the future.