利用VLBI观测对ERP参数和月地距变化相关性的研究
On the Correlation Between ERP and Earth-Moon Distance with 2000-2012 VLBI Data
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摘要: 处理了2000-01~2012-06的VLBI观测数据,提取了ERP地球自转参数信息,通过JPL的DE405星历计算得到了2000-01~2012-06的月地距时间序列;消除日长变化、极移和月地距时间序列趋势项,采用频谱分析的方法求得它们的周期;根据解算的周期推测日长变化和日地距可能存在相关性,并验证了推测。Abstract: ERP(earth rotation parameter) was got through the handing of the 2000-01-2012-06VLBI data;the time series of distance of the Moon and Earth by JPL(Jet Propulsion Laboratory) ephemeris was calculated.The trend of ERP and the Earth-to-Moon distance is removed,and the periods of them are calculated with spectral analysis.The correction between the Earth-to-Moon distance and the periodic components of ΔLOD(change in length of day) extracted by wavelet analysis is analyzed,which would make sense in the prediction of ERP based on the planetary ephemeris.
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