My research focuses on high-precision astrometry, with particular interest in measuring celestial positions at the microarcsecond level and constructing a unified multi-frequency celestial reference frame.
Celestial reference frames (CRFs) are fundamental to astronomy, geodesy, and deep-space navigation. We are now entering an era in which multi-frequency CRFs, realized by VLBI and Gaia, can reach microarcsecond-level accuracy, bringing both new opportunities and new challenges.
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Many extragalactic radio sources exhibit extended and variable structures, which can induce apparent positional shifts. These structure-related systematic effects have become one of the dominant error sources in VLBI astrometry.
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