利用GPS观测资料解算地球自转参数

Estimation of Earth Rotation Parameters Based on GPS Observations

利用22个IGS(International GNSS Service)跟踪站(IGS05)的连续观测资料估算地球自转参数ERP(Earth rotation parameters)(地球自转参数在测绘和卫星导航中是一组关键的参数),并与IGS地球定向参数EOP(Earth orientation parameters)(UTC 12:00:00)和IERS(International Earth Rotation Service)C04(UTC 00:00:00)同时刻的结果相比较。比较结果表明:与IGS EOP比较,极移在x方向差值的RMS为0.0214 mas,极移在y方向差值的RMS为0.0662 mas,UT1-UTC差值的RMS为0.0260 ms;与IERS C04比较,极移在x方向差值的RMS为0.0203 mas,极移在y方向差值的RMS为0.0354 mas,UT1-UTC差值的RMS为0.0016 ms。以上差别均在IERS C04精度范围之内,我们解算的地球自转参数结果是可信的。

The Earth 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 2mas in y-component of polar motion（y-Pole）,0.026 0 ms in 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.