ITRF2020-u2024

ITRF2020-u2024 is the second ITRF020 update, generated by adding four years (2021.0 – 2025.0) of data after the end of the ITRF2020 input data. The four Technique Centers (IDS, IGS, ILRS, IVS) who provided four years of extended time series of station positions and Earth Orientation Parameters (EOPs) were asked to use the same models and strategies as in their contributions to ITRF2020. ITRF2020-u2024 keeps the same frame parameters (origin, scale and orientation) as ITRF2020. This is intended to avoid any “datum” change in user applications. The computation strategy of ITRF2020-u2024 is identical to that of ITRF2020.

ITRF2020-u2024是国际地球参考框架（International Terrestrial Reference Frame, ITRF）2020的第二次更新版本，其生成方式为在ITRF2020输入数据的覆盖时段结束后，新增2021.0至2025.0共计四年的观测数据。提供四年扩展测站坐标与地球定向参数（Earth Orientation Parameters, EOPs）时间序列的四个技术中心（IDS、IGS、ILRS、IVS），被要求采用与提交ITRF2020相关贡献时完全一致的模型与解算策略。ITRF2020-u2024保留了与ITRF2020完全一致的参考框架参数（原点、尺度与定向），此举旨在避免用户应用中出现任何“大地基准”变更。ITRF2020-u2024的解算策略与ITRF2020完全一致。