利用射电天线轴线信息测定VLBI站点垂线偏差  

Determining the deflection of the vertical of VLBI stations using radio telescope axis information

作　　者：马小辉 孙中苗[2,3] 张志斌[4,5] 张阿丽 袁野[6] 孙正雄 王宏[7] MA Xiaohui;SUN Zhongmiao;ZHANG Zhibin;ZHANG Ali;YUAN Ye;SUN Zhengxiong;WANG Hong(Institute of Geospatial Information, Information Engineering University, Zhengzhou 450001, China;Xi’an Research Institute of Surveying and Mapping, Xi’an 710054, China;State Key Laboratory of Geo-information Engineering, Xi’an 710054, China;Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China;School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, China;Xinjiang Astronomical Observatory, Chinese Academy of Science, Urumqi 830011, China;Beijing Institute of Tracking and Telecommunications Technology, Beijing 100094, China)

机构地区：[1]信息工程大学地理空间信息学院,河南郑州450001 [2]西安测绘研究所,陕西西安710054 [3]地理信息工程国家重点实验室,陕西西安710054 [4]中国科学院上海天文台,上海200030 [5]中国科学院大学天文与空间科学学院,北京100049 [6]中国科学院新疆天文台,新疆乌鲁木齐830011 [7]北京跟踪与通信技术研究所,北京100094

出　　处：《测绘学报》2021年第3期315-323,共9页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(1703067,11873077)。

摘　　要：本文采用直接法推导了射电天线轴系误差的指向改正模型的完全表达式,统一了轴系误差指向改正模型与Lösler归心测量模型中共有轴系参数的定义,建立了射电天线指向测量模型与归心测量模型中天线方位轴倾角参数间的联系,从而实现了利用射电天线方位轴信息测定VLBI测站垂线偏差(DOV)的方法。该方法不依赖专用DOV测量设备,仅需天线不定期维护的指向校正测量数据和包含水准测量的归心测量数据,是一种直接测量法。用多种DOV测量方法对采用本方法测得DOV进行符合度验证,初步结果表明:DOV卯酉分量与实测值一致。DOV子午分量与实测值在方向上一致,数值上存在一定差异,这是因为天线指向校正测量时射电源在测站天区南北分布不均匀。今后将进一步通过优化天线指向修正测量,实现利用VLBI天线方位轴信息对VLBI站的DOV的高精度测定。The complete expression of pointing calibration model(PCM)for the axis related errors(ARE)of the radio telescope is derived directly.The definition of the common axis related parameters in both pointing correction model of ARE and Lösler’s indirect model(IM)is unified,then the relationship between PCM and IM of the radio telescope is established.Thus,the deflection of the vertical(DOV)determination of VLBI stations is realized by using radio telescope azimuth axis information.As a direct surveying approach,this method does not rely on special DOV surveying equipment.It could only depend on pointing calibration surveying data for telescope aperiodic maintenance and the local surveying data including leveling.Verified by a variety of DOV surveying methods,the DOV obtained by our method shows a good agreement with real surveyed DOV in west-east component.Owing to the non-uniform distribution of the radio sources sky coverage of the station during its pointing calibration,the north-south component of DOV has the same direction as the surveyed DOV,but has a difference in value.In the future,further providing an optimized telescope pointing calibration,the high precision surveying of DOV will be obtained by using VLBI telescope azimuth axis.

关 键 词：射电天线 VLBI 参考点 垂线偏差 轴线偏差 归心测量 指向改正 

分 类 号：P222[天文地球—大地测量学与测量工程]