水下目标亮点拓扑特征提取及自动识别方法  

Multiple highlights topology vector feature extraction and automatic recognition method for underwater target

作　　者：朱兆彤 彭石宝[2] 许稼[3] 许肖梅[4,5] 

机构地区：[1]中国船舶重工集团公司第七0五研究所,西安710077 [2]清华大学电子工程系,北京100084 [3]北京理工大学信息与电子学院,北京100081 [4]厦门大学水声通信与海洋信息技术教育部重点实验室,厦门361005 [5]厦门大学海洋与地球学院,厦门361101

出　　处：《声学学报》2018年第2期154-162,共9页Acta Acustica

基　　金：国家自然科学基金项目(41676024,41276039,61271391,61671061);陕西省博士后科研项目(2017BSHQYXMZZ04);中国船舶重工集团公司第七○五研究所博士后基金项目资助

摘　　要：针对水下目标逆合成孔径声呐（Inverse Synthetic Aperture Sonar,ISAS）图像识别问题中观测角度随机多变,目标结构相互遮挡问题,提出一种基于多亮点拓扑矢量特征的ISAS水下目标识别方法。通过分析ISAS成像过程中散射点位置由三维空间向二维成像平面的投影关系,表明了横向定标后的声呐图像中强亮点之间的距离仅由目标散射结构之间的物理距离决定,据此基于强亮点之间的相互距离,构造能稳定描述不同观测角度下目标的拓扑矢量特征。然后通过K-means聚类获取多聚类中心以克服目标结构互相遮挡造成的亮点缺失问题。最终采用最近邻分类器实现目标识别。水池缩比模型实验表明,该方法对于水下目标的识别率达到84.0%。To address the randomness of target aspect angle and the incompleteness of observed target in inverse synthetic aperture sonar （ISAS） imaging, a method for target recognition is proposed based on topology vector feature （TVF） of multiple highlights. Analysis of the projection relationship from 3D space to 2D imaging plane in ISAS indicates that the distance between two highlights in the cross-range scale calibrated image is determined by the distance between the corresponding physical scattering centers. Then, TVFs of different targets, which remain stable in various possibilities of target aspect angle, can be built. K-means clustering technique is used to effectively alleviate the effect of the point missing due to incompleteness of the observed target. A nearest neighbor classifier is used to realize the target recognition. The ISAS experimental results using underwater scaled models are provided to demonstrate the effectiveness of the proposed method. The classification rate is up to 84.0%.

关 键 词：水下目标 类型识别 识别率 拓扑特征 特征向量 自动识别 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]