水下小孔径阵列远程目标检测方法研究  

Research on remote target detection method of underwater small aperture array

作　　者：蒋西海 王晓林[1,2] 严琪[1] JIANG Xihai;WANG Xiaolin;YAN Qi(Hangzhou Applied Acoustics Research Institute,Hangzhou 310012,Zhejiang,China;Zhejiang University,Hangzhou 310058,Zhejiang,China)

机构地区：[1]杭州应用声学研究所,浙江杭州310023 [2]浙江大学,浙江杭州310058

出　　处：《声学技术》2021年第1期39-43,共5页Technical Acoustics

摘　　要：匹配滤波器频域自适应线谱增强方法是一种基于递归算法的非线性滤波技术,它大大提高了匹配滤波器的检测性能。针对当前该技术使用窄带信号作为发射信号存在可利用的带宽有限,不能充分发挥自适应线谱增强器性能的问题,文章提出将该技术与宽带信号相结合来检测远程目标。仿真显示,该方法在低信噪比条件下获得了较高的信噪比增益和检测概率。海试数据处理结果表明,该技术的处理增益较传统方法高6.24 dB。该方法的高处理增益适合应用在水下无人平台上,弥补了小孔径阵列空间增益不足的缺点,可以实现远程目标的检测。The frequency-domain adaptive line enhancement based on matched filter(FDAMF)method is a nonlinear filter based on recursive algorithm,which greatly improves the detection performance of matched filter.Because the narrowband signal is usually used as the transmitting signal in this method,the limited available bandwidth of the signal affects the detection performance of adaptive line enhancer.A FDAMF method for wideband signal is proposed in this paper to detect remote targets.By simulation analysis,for lower input signal to noise ratio,this method can obtain higher signal to noise ratio gain and has better detection performance.Sea trials show that the processing gain of this method is about 6.24 dB higher than that of conventional method.Therefore,this method is suitable for underwater unmanned vehicle,which makes up for the shortage of spatial gain of small aperture array to achieve remote targets detection.

关 键 词：水下无人航行器 匹配滤波器频域自适应线谱增强 双曲调频信号 宽带模糊度函数 

分 类 号：TN911.7[电子电信—通信与信息系统]