典型瞬态声信号倒谱域时延估计方法  

Time delay estimation method in cepstrum domain for typical transient signals

作　　者：余文晶 何琳[1,2] 徐荣武 崔立林 Yu Wenjing;He Lin;Xu Rongwu;Cui Lilin(School of Power Engineering, Naval University of Engineering, Wuhan 430033, China;National Key Laboratory on Ship Vibration and Noise, Wuhan 430033, China)

机构地区：[1]海军工程大学动力工程学院,湖北武汉430033 [2]船舶振动噪声重点实验室,湖北武汉430033

出　　处：《华中科技大学学报（自然科学版）》2018年第4期68-73,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51209214);海军工程大学科研发展基金资助项目(425517K031)

摘　　要：提出一种两通道典型瞬态信号时延估计方法.在低信噪比条件下,分别对每个通道的接收信号进行倒谱计算,然后对倒谱序列进行经验模态分解（EMD）,第一阶分量中幅值最大的脉冲尖峰即对应瞬态信号到达时刻.在高信噪比条件下,先提取瞬态信号并补偿至时间原点,再进行倒谱计算和峰值搜索.利用美国海军水下战中心给出的典型瞬态信号模型进行理论分析、数值仿真以及水下系泊试验,结果表明：与传统时延估计方法相比,提出的倒谱域时延估计方法适用于各种信噪比环境,能有效提高两通道瞬态信号间时延估计精度.A time delay estimation method for typical transient acoustic signals in two channels was proposed.Under the low SNR（signal-to-noise ratio） condition,the cepstrum of each channel signal was calculated,and then the cepstrum was decomposed into intrinsic mode function（IMF） components with empirical mode decomposition（EMD） method.The location of the pulse peak with maximal amplitude in the first IMF component was the arrival time of signal.Under the high SNR condition,the transient signal was extracted first,and then added to the received signal at time origin.Then the cepstrum of the constructed signal was calculated,and the pulse peak was searched.The theoretical calculation made with the transient signal model established by the Naval Undersea Warfare Center,simulation and results of underwater mooring test show that,compared with the traditional methods,the proposed method can be applied under different SNR conditions,which can improve the time delay estimation accuracy effectively.

关 键 词：瞬态信号 时延估计 倒谱 脉冲尖峰 低信噪比 

分 类 号：TB52[理学—物理]