水下运动阵列多目标检测和方位估计一体化方法  

Integrated method for multi-target detection and DOA estimation by underwater moving array

作　　者：侯云山[1] 汤艳红[1] 

机构地区：[1]河南科技大学电子信息工程学院,河南洛阳471003

出　　处：《计算机工程与应用》2014年第1期211-214,共4页Computer Engineering and Applications

基　　金：国家自然科学基金(No.61001153);河南省自然科学基金(No.112300410024)

摘　　要：水下多目标的远程检测和方位估计是是水下阵列信号处理的两个关键问题。传统的方法是将这两个方面分开处理,先通过某种检测方法来检测目标个数,然后再利用某种方位估计方法来确定各个目标的方位。这样前面目标检测的结果的好坏就直接影响到后面目标方位估计的性能。针对低信噪比下传统检测方法的性能差且不能同时给出方位估计的问题,提出了一种基于水下运动阵列合成孔径技术的多目标检测和方位估计一体化新方法 SATDE。该方法充分利用水下运动阵列合成孔径技术来提高阵增益和角度分辨率,并利用体现信号能量的MVDR空间谱函数来确定目标的个数及方位。仿真结果表明,对于相干信号来说,提出的方法在低信噪比下的检测性能显著优于AIC和MDL等传统方法,并且可以同时给出正确的方位估计。In the field of array signal processing, the detection of the number of signals and estimation of the Direction of Arrival（DOA）of signals are two important issues. They are generally solved separately with some algorithms dedicated to detection and other algorithms dedicated to DOA estimation. An integrated method called Synthetic Aperture Technique based Detection and Estimation（SATDE）is proposed for multi-target detection and DOA estimation by underwater moving array. The proposed method exploits the synthetic aperture technique to achieve high angular resolution and the energy detection idea embodied in Minimum Variance Distortionless Response（MVDR）spectrum function to determinate the number and DOA of signals at the same time. Simulations and experimental results show that the proposed method yields better detection performance than conventional detection methods such Akaike Information Criterion（AIC）and Minimum Descriptive Length（MDL）for closely-spaced coherent signals and produces correct DOA estimations at the same time.

关 键 词：目标检测 方位估计 角度分辨率 合成孔径 最小方差无失真响应(MVDR) Minimum Variance Distortionless Response(MVDR) 

分 类 号：TN911.7[电子电信—通信与信息系统]