复倒谱域水声信道多途抑制技术  

Anti-multipath technique of underwater acoustic channel in complex cepstrum domain

作　　者：付进[1,2] 许婉琰 王燕[1,2] 梁国龙[1,2] 

机构地区：[1]哈尔滨工程大学水声技术重点实验室,黑龙江哈尔滨150001 [2]哈尔滨工程大学水声工程学院,黑龙江哈尔滨150001 [3]昆明船舶设备研究试验中心,云南昆明650051

出　　处：《哈尔滨工程大学学报》2015年第9期1188-1193,共6页Journal of Harbin Engineering University

基　　金：国家自然科学基金资助项目(51279043;61201411;51209059);国家863计划资助项目(2013AA09A503);水声技术国家重点实验室基金资助项目(9140C200203110C2003);黑龙江省普通高等学校青年学术骨干支持计划(1253G019)

摘　　要：水下声信道因边界反射及介质不均匀性而呈现多途特性,如何采取有效措施抑制信道多途影响一直以来都是水声领域的难点和热点问题。基于同态滤波基本原理,研究了水声多途信道的复倒谱特性,据此提出了一种适用于将信道与信号分离的复倒谱域特征滤波器构建方法,并与常用的低通特征滤波器、梳状特征滤波器进行了对比分析。研究结果表明,提出的方法可有效抑制信道多途,且与上述2种特征滤波器比较,所提方法具有构建方法简易、重构信号误差较小等特点,具有工程应用价值。Because of boundary reflections and the non-homogeneity of water in the sea,an underwater acoustic channel is regarded as a multipath channel. Therefore managing multipath interference effectively has always been a difficult and hot issue in underwater acoustics. Based on the fundamental theory of homomorphic filters,the characteristics of an underwater multipath acoustic channel in a complex cepstrum domain were analyzed. Then a new kind of feature filter,pinnacle search method,which is suitable for separation of the signal and the channel in a complex cepstrum domain,was put forward. The features of this method were analyzed and compared with the low-pass feature filter and the comb feature filter. The results show that the proposed method can manage the multipath effects effectively. Compared with the other two feature filters,the pinnacle search feature filter can easily be established with smaller error in reconstructing signals,and so is valuable in engineering application.

关 键 词：多途信道 复倒谱 特征滤波器 尖峰搜索法 重构信号 

分 类 号：TB566[交通运输工程—水声工程]