基于分数低阶谱图的非平稳信号时延估计

Time Delay Estimation Method of Non-Stationary Signals based on Fractional Lower Order Spectrogram

依据分数低阶统计量理论,讨论了分数低阶短时Fourier变换、分数低阶谱图等时频表示方法在非高斯FLOA噪声环境下的适用性.针对传统时间延迟估计方法在非高斯非平稳环境下的退化现象,提出一种基于分数低阶谱图的非平稳信号时间延迟估计新方法.理论分析和仿真实验结果表明,新方法同时适用于高斯和非高斯FLOA噪声环境下的非平稳信号时间延迟估计,具有良好的韧性.

According to fractional lower order statistics theory,the applicability of fractional lower order short time Fourier transform and fractional lower order spectrogram under and non-Gaussian FLOA conditions is discussed. In order to combat the degeneration of traditional time delay estimation method under non-Gaussian and non-stationary environment,a new time delay estimation method based on fractional lower order spectrogram is proposed. Theoretical analysis and computer simulations indicate that the new time delay estimation algorithm is suitable for both Gaussian and non-Gaussian conditions.