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本文用ILS系统地极坐标资料(1900.0—1979.0),对各个时期钱德勒谱峰的频率特性作了较细致的分析。结果表明:主峰双频只是一种长期的统计特性,从局部看,出现单频和双频的概率约各占50％,因此,还不能说“双频”是钱德勒摆动的基本特征。在物理上,可能用时变性二分模型来描述它更妥当。Q_(C.W)实测值的平均值为235,众数为125,这与由地震观测得到的结果较为一致。
In this paper, the polar coordinate data of ILS system (1900.0-1979.0) are used to analyze the frequency characteristics of Chandler spectral peaks in different periods. The results show that the main peak dual-frequency is only a long-term statistical feature. From a local perspective, the probability of occurrence of single frequency and dual frequency is about 50%. Therefore, it can not be said that “dual frequency” is the basic feature of Chandler swinging. Physically, it may be more appropriate to describe it as a time-varying dichotomous model. The average of Q_ (C.W) measured values is 235 and the mode is 125, which is in good agreement with the results from the seismic observations.