一种基于四阶累积量的声定向方法  

A method of DOA estimation based on fourth-order cumulant

作　　者：何轲[1] 王海燕[1] 申晓红[1] 朱梦阳[1] 李保军[1] 

机构地区：[1]西北工业大学航海学院,西安710072

出　　处：《国外电子测量技术》2011年第2期9-13,共5页Foreign Electronic Measurement Technology

基　　金：国家科技重大专项(2008ZX05026-001-06)资助项目

摘　　要：针对深水钻井隔水管监测系统水下测点的声定向问题,建立了空间任意结构阵列的数学模型,分析了阵列信号的四阶累积量特性,提出了一种基于四阶累积量的空间任意结构阵列MUSIC算法,可对多于阵元数的空间多目标源进行二维波达方向估计,并能够有效抑制高斯色噪声。以一种空间结构的四元立体阵为例进行了计算机仿真,实现了对空间四个不同方向目标的二维波达方向估计,且对高斯噪声的抑制性能优于二阶统计量MUSIC算法。The DOA estimation problem related to the monitoring system of deep water riser is studied.The mathematical model of nonplanar array with arbitrary geometry is established.The characteristics of fourth-order cumulant of array signal are analyzed.high resolution Direction-Of-Arrival（DOA）estimation method Multiple Signal Classification（MUSIC）algorithm for nonplanar array with arbitrary geometry based on fourth-order cumulant is proposed,and the method makes it possible to estimate DOAs of multiple sources which are more than the number of elements of the array,and the gaussian color noise can be effectively restrained by means of this method.Computer simulations are presented for a nonplanar quaternion array,and he results of the simulation show that the DOAs of four sources can be correctly estimated,and the gaussian color noise can be restrained more effectively than MUSIC algorithm based on second-order cumulant.

关 键 词：四阶累积量 MUSIC 波达方向 

分 类 号：TB566[交通运输工程—水声工程] TE52[理学—物理]