利用2006—2015年VLBI数据进行地球定向参数解算与分析

Solution and Analysis of Earth Orientation Parameters with 2006—2015 VLBI Observation

目前正处在下一代甚长基线干涉测量(very long baseline interferometry,VLBI)系统的建设时期。利用维也纳VLBI与卫星软件(Vienna VLBI and satellite software,VieVS)解算了2006-2015年的VLBI数据,得到了10 a的地球定向参数(Earth orientation parameters, EOP)时间序列,并与国际地球自转服务机构的结果进行了对比。利用解算结果得到了10 a的日长变化时间序列,通过傅里叶分析得出了日长变化的短周期、半月周期、月周期、半年周期和周年周期,同时还分析得到了极移序列中的周年项和张德勒周期项以及章动改正序列中的自由核章动项。此次解算工作可为武汉大学卫星台站日后的VLBI数据解析积累一定的经验。

It is currently in the period of construction of the next generation of very long baseline interferometry(VLBI) systems. This is a good opportunity for Wuhan University satellite station. We count observation times of different stations and number of stations from 2006 to 2015. We process VLBI data from 2006 to 2015 to estimate Earth orientation parameters(EOP) using Vienna VLBI and satellite software(VieVS).Internal and external accord accuracy of EOP during 2006-2015 are credible. Ten years of changes of the length of day(ΔLOD) are estimated and compared with the results of International Earth Rotation Service(IERS). The short(9.13 d), half-month(13.67 d), month(27.65 d), half-year(182.50 d) and year(365.00 d)periods of ΔLOD are extracted with fourier analysis. The year, Chandler periods of polar motion and the free core nutation period of nutations correction are also extracted. This solution can accumulate some experience of VLBI data analysis for Wuhan University satellite station.