CAJ | 학술논문

针对卫星导航所需的高精度地球定向参数(EOP)中的 UT1-UTC 预报问题,提出了基于双差分 LS+AR 的 UT1-UTC 参数预报方法。对 UT1-UTC 观测数据进行跳秒检测、固体地球带谐潮汐项改正,然后对改正后的 UT1-UTC 数据进行双差分处理,增强数据平稳性；采用最小二乘拟合(LS)与自回归(AR)分析方法对差分处理后的数据进行分析与预报；对预报结果进行逆差分处理与潮汐项改正外推、跳秒恢复,获取高精度的 UT1-UTC 预报值。通过与国际 EOP_PCC 预报结果对比表明,UT1-UTC 短期预报精度与 EOP_PCC 较优的预报精度相当,其中1天 UT1-UTC 预报精度优于0.03 ms,优于 EOP_PCC 预报结果。介绍了北京航天飞行控制中心的 UT1-UTC每日例行预报情况。
침대위성도항소수적고정도지구정향삼수(EOP)중적 UT1-UTC 예보문제,제출료기우쌍차분 LS+AR 적 UT1-UTC 삼수예보방법。대 UT1-UTC 관측수거진행도초검측、고체지구대해조석항개정,연후대개정후적 UT1-UTC 수거진행쌍차분처리,증강수거평은성；채용최소이승의합(LS)여자회귀(AR)분석방법대차분처리후적수거진행분석여예보；대예보결과진행역차분처리여조석항개정외추、도초회복,획취고정도적 UT1-UTC 예보치。통과여국제 EOP_PCC 예보결과대비표명,UT1-UTC 단기예보정도여 EOP_PCC 교우적예보정도상당,기중1천 UT1-UTC 예보정도우우0.03 ms,우우 EOP_PCC 예보결과。개소료북경항천비행공제중심적 UT1-UTC매일례행예보정황。
This paper proposes a prediction method of UT1-UTC in Earth orientation parameters (EOP)by dual differential least-squares (LS)and autoregressive (AR)model.Firstly,leap seconds are removed in UT1-UTC observations,and Earth zonal harmonic tidal are corrected.Then,the corrected UT1-UTC are processed by dual differential method,the stationarity of polar motion parameters is improved.LS+AR method is utilized to analyze the dual differential UT1-UTC to obtain the preliminary prediction results.Finally,the preliminary prediction results are processed by inverse dual differential method,and tidal correction are extrapolated and leap seconds are recovered to obtain high accuracy UT1-UTC prediction results.The prediction results are compared with EOP prediction comparison campaign (EOP_PCC)results.It shows that the short-term UT1-UTC parameters prediction error is at the same level of EOP_PCC.The one day prediction accuracy of UT1-UTC is less than 0.03ms,which is better than EOP _ PCC one day UT1-UTC prediction accuracy.And,the daily routine UT1-UTC prediction in Beijing Aerospace Control Center is introduced.