【作者】 李蓉艳； 马远良； 张翼鹏； 何正耀；

【Author】 LI Rong-yan, MA Yuan-liang, Zhang Yi-peng and He Zheng-yao (Institute of Acoustics Engineering, Northwestern Polytechnical University, Xi’an 710072, China)

【机构】 西北工业大学声学工程研究所；

【摘要】 由于多途效应,水下声源和水听器之间的通道可以建模为一个多途时延衰减信道。通过水下信道特性的合理假设,盲解卷积技术可以用于浅海水下信道的估计。不需要源信号和信道的先验知识,利用单水听器的接收数据,采用频率域的自然梯度方法、等变化方法、信息最大化方法来估计水下仿真信道,仿真证明了它们对水下信道估计的性能,其中等变化和自然梯度方法明显由于信息最大化方法。更多还原

【Abstract】 Blind deconvolution techniques can be used to estimate channel impulse response of acoustic environment if reasonable assumptions about the nature of the underwater channel used to represent the multipath propagation can be made. The methodology is implemented in frequency-domain based on natural gradient, infomax and EASI blind deconvolution algorithm with a single hydrophone and no prior information on characteristics of the source or the channels. An application example of the approach to synthetic ocean acoustic data is presented. Simulation results indicate EASI and natural gradient approach is better than infomax method in efficiency and stable capability. The frequency domain method needs less computational complexity than time-domain and suitable for estimation of shallow-water channel.更多还原