波谱分辨率与Chandler摆动的双频现象

Spectrum resolution and two-frequency of Chandler wobble

地极移动中Chand ler摆动有时出现的双频现象,一直为许多学者所关注。分析了IERS新近公布的经统一归算的极移数据,结合频谱分析中分辨率的有关问题,进一步讨论了Chand ler摆动的双频现象。分析认为,文中采用的极移资料序列的采样间隔及序列长度已满足分辨Chand ler摆动双频的要求。所得结果支持Chand ler摆动存在双频的观点,同时给出了该极坐标序列存在的约0.3 a至50 a间的一些周期的参数。

Many researchers have been interested in whether Chandler wobble exists two-frequency. In the paper, the authors analyzed polar motion data series recently released by IERS, and in combination with spectrum resolution, discussed two frequency of Chandler wobble. After analyzing, the author thought sampling interval and length of this data series satisfied request for studying two-frequency of Chandler wobble. The result supported the viewpoint that Chandler wobble exists two-frequency, meanwhile this paper presented some polar motion＇s periods whose values vary from 0.3 year to 50 year.