通过观测一维像序列的长度变化周期，提取目标的章动频率；
By observing the periods of the target length variant, the frequency of nutation is deduced.
根据地球自由核章动在周日重力潮汐观测中的共振效应确定了自由核章动的复本征周期和品质因子Q 值，研究了极移重力效应；
The complex eigen period period and Q value of the FCN are evaluated based on the resonance observed in the diurnal tidal gravity, the gravity change due to the polar motion is also studied.
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