HE Zhan-ke1,2, YANG Xu-hai 1, LI Zhi-gang 1, CHENG Zong-yi 3　

(1. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600, China;

 2. Graduate University of the Chinese Academy of Sciences, Beijing 100039, China;

3. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China)

Abstract: TheEarth rotation stations parameters (ERP), which are a set of key parameters for satellite navigation and surveying/mapping, are estimated by using the consecutive GPS observation data from 22 IGS stations. The estimated ERP values are compared with the IERS C04 (UTC 00:00:00) eries and the IGS EOP(UTC 12:00:00) series. The comparisons show that the RMS values of the differences between the series given in this paper and IGS EOP(UTC 12:00:00) series are 0.021 4 mas in x-component of polar motion(x-Pole), 0.066 2 in y-component of polar motion(y-Pole), 0.026 0in UT1-UTC, and the RMS values of the differences between the series given in this paper and IERS C04 (UTC 00:00:00) series are 0.020 3 mas in x-Pole, 0.035 4 mas in y-Pole, 0.001 6 ms in UT1-UTC. The accuracy of the ERP estimated is close to that of IERS C04, and the results are credible.

Key words: Earth rotation parameters; GPS; IGS(International GNSS Service); IERS(International Earth Rotation Service)