中文摘要：

分析ERP参数的30 d和365 d预报值的精度,以及预报误差对天文经纬度和天文方位角测量的影响。分析结果表明,在进行天文经纬度测量时,可采用365 d的极移预报值和30 d的日长预报值进行实时解算;在采用北极星时角法进行天文方位角测量时,可采用365 d的极移和日长预报值进行实时解算。

英文摘要：

The accuracy of 30 and 365 days prediction value of ERP were respectively analyzed,as well as their impact to astronomical geodesy were analyzed. Analysis results show that： the 365 days prediction values of polar motion and 30 days prediction values of length of day（ LOD） could be used in astronomical longitude and latitude measurement,and 365 days prediction values of ERP could be used in astronomical azimuth measurement.