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中文摘要：
为了研究地球2阶重力场的时变规律,分别利用CSR发布的从2003—2014年这12a的SLR观测数据与GRACE卫星数据解算得到的地球重力场2阶项位系数,构造时间序列并进行分析;同时用小波分析探究其时间序列的周期特性。结果表明,基于GRACE卫星数据解算得到的结果半年周期性强于基于SLR观测数据解算的结果,除了C21以外,基于二者解算得到的结果都有较明显的周年周期特性;利用交叉小波和相干小波相干谱分析得到,基于二者解算的2阶项位系数C20、C22、C21、S22在周年周期上具有较强的相关性。
英文摘要：
To study the temporal variation of the earth＇s 2 order gravity field,time sequence was constructed and analyzed utilizing degree-2 earth＇s gravity fieldharmonic coefficients from 2003 to 2014 determined by SLR and GRACE released by CSR.At the same time,the periodic characteristics of time sequencewere analyzed by wavelet analysis.Wavelet transformation and coherence analysis were made to compare the degree-2 harmonics from SLR and GRACE.GRACE products have stronger semi-annual cycle than those of SLR products.The both results have a significant annual cycleexcept C21.The 2-degree spherical harmonic coefficients of C20,C22,S21 and S22existstrong correlation in the annual cycle by the cross wavelet transform and wavelet coherence.
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