摘要
匹配追踪能够根据地震信号自身的特点进行自适应分解,但因计算量巨大使其不能被广泛应用.本文提出了一种正交时频原子快速匹配追踪方法,该方法在迭代分解过程中,充分利用地震信号的局部性特征作为先验信息点,在先验信息点附近采用动态搜索策略寻找最佳匹配时频原子,同时对时频原子进行正交变换,消除了时频原子库中的冗余分量,最终将信号分解为一系列正交时频原子的线性叠加.测试结果表明,该方法不仅保持了匹配追踪的分解精度,而且使计算效率有了质的提高.
Matching pursuit can make adaptive decomposition according to the characteristics of seismic signal, but the computation is so enormous that it has not been widely used. This paper proposed a fast matching pursuit strategy with orthogonal time-frequency atoms. During the iteration procedure, this method fully used the local characteristics of seismic signal as a priori information points. Around the a priori information points, dynamic optimal search is used to find the best time-frequency atom. At the same time, the time-frequency atoms are orthogonally transformed to eliminate the redundant components in the atom dictionary. Eventually, the seismic signal is decomposed into a linear superposition of a series of orthogonal atoms. Test results show that this method not only maintains the precision of original matching pursuit, but also substantially improves its computational efficiency.
出处
《地球物理学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第1期277-283,共7页
Chinese Journal of Geophysics
基金
国家973项目(2007CB209605)资助
关键词
正交时频原子
快速匹配追踪
动态最优搜索
信号分解
计算效率
Orthogonal time-frequency atom, Fast matching pursuit, Dynamic optimal searching, Signal decomposition, Computational efficiency
