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中文摘要：
利用小波功率谱分析和离散小波变换，对CNES／GRGS、CSR、GFZ等研究机构发布的GRACE时变重力位模型的J2项时间序列进行了周期分析和特征提取，并与利用SLR跟踪数据获得的J2项时间序列的分析结果进行了比较，结果显示：SLR跟踪数据获得的J2项相较GRACEJ2项具有更明显的季节性变化特征。GRACE时变重力位模型的J2项中混淆进了161天的周期信号，是由海洋潮汐模型中存在的太阳半日分潮S2项的误差引起的。
英文摘要：
By use of wavelet power spectrum analysis and discrete wavelet transform, the periods and characteristics of J2 time series of GRACE time-variable gravity models from CNES/GRGS,CSR,GFZ are analyzed and extracted, and then they are compared with the corresponding results of J2 time series from SLR tracking data. The resah shows that, the seasonal variation of J2 time series from SLR is clearer than that from GRACE. In addition,the signal for 161 days is mexed into GRACE ,12 time series,which is caused by ocean tide model error in the S2 solar tide.
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