.png){kind=icon}
返回
Long-term polar motion prediction using normal time-frequency transform
.png){kind=icon}
OA
AI
DOI：10.1007/s00190-013-0675-7.png)
.png){kind=icon}
原文求助.png){kind=icon}
分享.png){kind=icon}
收藏
摘要
En 中文
This paper presents normal time-frequency transform (NTFT) application in harmonic/quasi-harmonic signal prediction. Particularly, we use the normal wavelet transform (a special NTFT) to make long-term polar motion prediction. Instantaneous frequency, phase and amplitude of Chandler wobble, prograde and retrograde annual wobbles of Earth's polar motion are analyzed via the NTFT. Results show that the three main wobbles can be treated as quasi-harmonic processes. Current instantaneous harmonic information of the three wobbles can be acquired by the NTFT that has a kernel function constructed with a normal half-window function. Based on this information, we make the polar motion predictions with lead times of 1 year and 5 years. Results show that our prediction skills are very good with long lead time. An abnormality in the predictions occurs during the second half of 2005 and first half of 2006. Finally, we provide the future (starting from 2013) polar motion predictions with 1- and 5-year leads. These predictions will be used to verify the effectiveness of the method proposed in this paper.
Keyword:
Normal time-frequency transform
Harmonic information
Normal window function
Polar motion prediction
期刊
IF:
4
论文数:
2.5K
被引数:
7.6K
机构
引用论文
.png){kind=icon}
High resolution studies of NiSi2 ultrathin film formation by ion scattering and cross-section tem
PREAI
分享收藏分享收藏分享收藏Palatoplasty for the Patient With Campomelic Dysplasia—Report of a Case and Review of the Literature
PREAI
分享收藏 没有更多内容
没有更多内容