Multi-frequency celestial reference frame

We present a celestial reference frame (CRF) based on the combination of independent, multifrequency radio source position catalogs using nearly 40 years of very long baseline...本研究构建了一套天球参考架（celestial reference frame, CRF），其基于多组独立多频段射电源位置星表的融合，所用数据覆盖近40年的甚长基线（very long baseline）观测……