via GPS Observations

It is been an important topic in the field of astrometry and geodesy to monitor thereference point and axis offsets of VLBI antenna with high precision.The common monito-ring method is based on some special restrictions to the rotation mode of antenna,which ab-sorbs much of the effective time during operation of the telescope.Monitoring is also subjectto meteorological conditions,and so there are limitations in the actual precision and timeli-ness of such monitoring.In recent years,the concept of VLBI antenna monitoring based onparameterized modeling of the antenna rotation has gradually become more acceptable,and isexpected to perform all-weather and fully automatic monitoring of the antenna without anyinterruption of normal operation of the telescope.In order to investigate the feasibility of thisconcept when designing monitoring procedures and to develop data processing software,some insights and analysis concerning the observation equation,the settings of unknown pa-rameters and the application of constraint conditions are presented.A simulation analysis ofthe VLBI antenna monitoring using GPS data and some preliminary conclusions are given forcriticism and reference for readers.