基于分形编码的天体光谱降噪方法  

A Fractal Denoising Method for Astronomical Spectral Signal

作　　者：韩金姝[1,2,3] 罗阿理[1] 赵永恒[1] 

机构地区：[1]中国科学院天文光学重点实验室(国家天文台),北京100012 [2]中国科学院研究生院,北京100049 [3]德州学院计算机系,山东德州253020

出　　处：《光谱学与光谱分析》2011年第12期3399-3402,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(10973021)资助

摘　　要：为了降低噪声影响,恢复光谱的连续谱和谱线等主要特征,以便准确测量谱线的等值宽度,文章根据天体光谱自身具有局部自相似性,而随机白噪声不具有自相似性,首次将分形方法应用于天体光谱降噪。实验表明,分形降噪方法对于准确测量谱线的等值宽度、星系红移等参数是有效的,此外,还可以实现数据压缩。分形方法适用于海量光谱的降噪和数据存储。To restore the continuum and the spectral lines from a noisy astronomical spectrum,then to measure the equivalentwidths of the spectral lines,the fractal denoising method was firstly used in astronomical spectra in the present paper.Themethod is based on the distinguishing features,that is the local self-similarities exist in an astronomical spectrum,while not in arandom white noise signal.The experimental results show that the fractal denoising method is efficient in parameter measure-ments,such as equivalent widths for spectral lines,redshift of galaxies,and so on.In addition,the method can achieve datacompression.The fractal method can be used in the mass spectra of LAMOST.

关 键 词：天体光谱 分形 降噪 等值宽度 

分 类 号：TN911.7[电子电信—通信与信息系统]