【摘要】 同时采用 4个台站的国际超导重力仪长期连续重力观测资料和国际地球自转服务中心提供的同步地球自转参数 ,研究了极移引起的地球重力场变化特征。利用自回归模型估计了各序列的功率谱密度和积谱密度 ,结果表明极移导致的重力效应的主要能量集中在Chandler摆动和周年项附近 ,叠积后实际重力观测与极移重力信号理论值之间的差异分别为 0 .4 %和 3.9% ,说明超导重力仪可有效监测极移导致的重力变化更多还原

【Abstract】 The changing character of the Earth’s gravity field is studied in this paper by using simultaneously long-term continuous gravity observations recorded with international SG at 4 stations and the ERP from IERS. The PSD and product spectra of each sequence are calculated by auto-regression model. The results indicate that main energy of gravity caused by polar motion is concentrated near the Chandler and annual periods,after stacking process, the difference of the gravity signal in polar motion between real gravity observations and the theoric is 0.4% and 3.9% respectively. It indicates that SG observations can detect effectively the gravity change caused by polar motion.更多还原