天球参考架的稳定源选取及其最新实现

Newly Realization of Celestial Reference Frame by Stable Sources Selection

天球参考架是对理想的天球参考系的实现,其稳定性直接决定了所描述天体运动规律及某些地球物理现象的精度。基于1979-2007年期间全球IVS(international VLBI service)网近30年的观测资料,利用上海天文台的Calc_Solve系统对天测与测地VLBI资料进行解算和分析,得到一系列由射电源坐标(赤经和赤纬)构成的时间序列。通过对该时间序列的稳定性的检验和分析,制定选择稳定源的标准,得到一套稳定的河外射电源表列,最终实现由173颗稳定的定义源与135颗补充源构建的稳定天球参考架。

When the motion of celestial bodies and some geophysical phenomena is described,a high precision and steady celestial reference system（CRS） is needed.An ideal CRS is equivalent to an inertia reference system.Celestial reference frame（CRF） is the realization of ideal CRS,the stability of which will directly determine the precision of celestial objects＇ motion and some geophysical phenomena.Based on nearly 30 years astrometric/geodetic observations of global IVS（international VLBI service） during 1979 to 2007,it is processed and analyzed the data using Calc_Solve software system on Shanghai Astronomical Observatory,CAS.Then it is acquired a series of coordinates（right ascension and declination） of radio sources,which can be made up to time series for our research.Stability of sources were checked and analyzed by the time series,a set of standards for the selection of stable sources is worked out,and then a set of lists of stable sources acquired.At last,a newly stable CRF are realized by 173 stable defining sources and 135 supplemental sources.