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

作　　者：孙永梅[1] 邱天爽[2] 王富章[1] 郭宇明[3] 

机构地区：[1]中国铁道科学研究院电子计算技术研究所,北京100081 [2]大连理工大学电子信息与电气工程学部,辽宁大连116024 [3]大连交通大学图书馆,辽宁大连116028

出　　处：《大连交通大学学报》2016年第3期112-116,共5页Journal of Dalian Jiaotong University

基　　金：中国博士后科学基金资助项目(20070410347)

摘　　要：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.

关 键 词：时间延迟 非平稳 分数低阶 谱图 

分 类 号：TN911.23[电子电信—通信与信息系统]