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GRACE J2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。
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.
出处
《大地测量与地球动力学》
CSCD
北大核心
2009年第4期140-143,147,共5页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(40637034
40874012)
武汉大学地球空间环境与大地测量教育部重点实验室开放研究基金(07-05)
关键词
GRACE
J2项
小波分析
离散小波变换
小波功率谱
GRACE
J2 time series
, wavelet analysis
discrete wavelet transform
wavelet power spectrum
