北半球的大气环流对自转速率周年项的激励约为60％，对半年项及其他短周期项的贡献约为15％以上。
The annual change of the Earth's rotation iS excited about 60% by the annual change of zonal wind velocity, and the semi-annual term as well as other periodic terms are about 15%.
作为对照，用自相关功率谱分析检测短周期项的理论值序列和BIH的世界时序列，都得到了显著的短周期项功率谱。
In contrast with this result, the same analyses of both the theoretical series of tidal terms and the, BIH series of UT demonstrafe the notable power spectrum of the short-period terms.
对所得仿真数据利用求和取平均的方法去除摄动力产生的短周期效应，通过分析去短周期项后的数据揭示出逆行地球同步轨道的演变特点。
Numerical solutions are periodically summed and averaged to get rid of short-periodic-term effects. By analyzing polished data, its orbit characteristics are revealed to us.
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