【摘要】 针对利用Wigner-Ville分布进行时频分析时受交叉项干扰的缺点,提出了基于经验模态分解的Wigner-Ville时频分布方法。首先通过经验模态分解使非平稳信号平稳化,将信号分解成为多个相互独立且具有简单频率成分的内蕴模式函数,然后对这些内蕴模式函数分别计算Wigner-Ville分布,最后重构原始信号的Wigner-Ville分布。通过理论模型和实际地震信号分析验证了该方法在降低交叉项干扰、提高时频分析精度方面的有效性。更多还原

【Abstract】 Time-frequency analysis using Wigner-Ville distribution suffers from interference of the cross terms.We presented a new Wigner-Ville distribution based on empirical mode decomposition (EMD).Nonstationary signal is decomposed into intrinsic mode functions (IMF)which are stationary,and Wigner-Ville distributions are then computed on these IMFs.Tests on synthetic and real seismic data showed the effectiveness of the proposed method.更多还原