小波变换应用于日长变化的研究进展

Study progress of wavelet transform applying in length-of-day change

随着空间测地技术的发展,日长变化的观测资料已经达到了空前高的程度,迫切需要合适的数学工具和方法从这些高精度的观测资料中提取有价值的信息.近些年,小波变换被应用于天文学和地球科学的资料分析中,它通过伸缩和平移等运算对时间信号进行多尺度的细化分析,从中提取有效的信息.本文主要介绍了小波变换应用于日长变化的研究进展,并初步探讨该领域以后的研究方向.

With the advance in space geodetic techniques, observations about length-of-day （I.OD） change reach unprecedented precision and resolution. We need to use the appropriate mathematical methods to analyze these observations and extract valuable information from observed series. In recent years, the wavelet transform is applied to data processing in astronomy and Earth science fields. Through expansion, contraction and translation arithmetic, it can carry on thin analysis with some scales to some time series, and withdraws the effective information. This article reviews study progress about wavelet analysis in LOD change. Intending research aspect is discussed in the end of this paper.