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基于改进pso-ica的地震信号去噪方法

Keywords: 改进的pso-ica,去噪,独立分量分析,变步长,粒子群优化算法,惯性权重

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Abstract:

?为了改善常规固定步长独立分量分析(ica)算法的叠前地震信号去噪效果,本文提出一种基于混沌粒子群优化(pso)的改进ica算法。该算法利用混沌pso动态调整相对梯度ica的步长函数,减小ica算法的稳态误差。在混沌pso优化过程中,采用一种基于反正切函数的非线性递减惯性权重,提高pso迭代初期的全局搜索能力和迭代后期的局部搜索能力。模型试算和实际单炮记录处理结果表明:本文提出的改进ica算法去噪效果明显,有效信号损失小。与其他算法相比,改进ica算法不仅能很好地保护有效地震信号,而且能提高信噪比。

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