论文标题
Taiji-1观测值的全球重力场模型
Global Gravity Field Model from Taiji-1 Observations
论文作者
论文摘要
Taiji-1是中国太空传播引力波天线的Taiji计划的第一个技术演示卫星。在展示了关键个体技术之后，太极-1继续收集精确轨道确定，卫星态度和非保守力的数据。因此，在自由落体期间，太极-1可以被视为在重力恢复任务的高低卫星至健康跟踪模式下运行。在这项工作中，我们从Taiji-1的观察结果中选择并分析了一个月的数据，并开发了由于预定的技术演示实验而导致的数据，以解决数据中的长期中断和干扰。独立衍生自中国卫星任务的第一个全球重力模型\ texttt {tjgm-r1911}成功地从太极-1的观察结果中构建而成。与Champ和其他卫星重力任务的重力模型相比，存在准确性差异，这主要是由于数据不连续性问题引起的。随着延长的自由落体阶段的批准，Taiji-1自2022年以来可以作为中国的重力恢复任务，它将为我们提供对静态和每月可延期全球重力领域的独立测量。
Taiji-1 is the first technology demonstration satellite of the Taiji program of China's space-borne gravitational wave antenna. After the demonstration of the key individual technologies, Taiji-1 continues collecting the data of the precision orbit determinations, satellite attitudes, and non-conservative forces exerted on the S/C. Therefore, during its free-fall, Taiji-1 can be viewed as operating in the high-low satellite-to-satellite tracking mode of a gravity recovery mission. In this work, we have selected and analyzed the one month data from Taiji-1's observations, and developed the techniques to resolve the long term interruptions and disturbances in the data due to the scheduled technology demonstration experiments. The first global gravity model \texttt{TJGM-r1911}, that independently derived from China's own satellite mission, is successfully built from Taiji-1's observations. Compared with gravity models from CHAMP and other satellite gravity missions, the accuracy discrepancies exist, which is mainly caused by the data discontinuity problem. As the extended free-falling phase been approved, Taiji-1 could serve as a gravity recovery mission for China since 2022 and it will provide us the independent measurement of both the static and the monthly time-variable global gravity field.
