【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.更多还原

【Abstract】 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.更多还原