利用频率波数谱能量扩展差异的水面水下目标分辨  

Surface and submerged target discrimination using frequency wavenumber spectral energy expansion differences

作　　者：李鹏 张学刚 车树伟 曹峰 LI Peng;ZHANG Xuegang;CHE Shuwei;CAO Feng(Science and Technology on Underwater Test and Control Laboratory,Dalian 116013;Dalian Scientific Test and Control Technology Institute,Dalian 116013;Underwater Acoustic Engineering Department,Harbin Engineering University,Harbin 150001)

机构地区：[1]水下测控技术重点实验室,大连116013 [2]大连测控技术研究所,大连116013 [3]哈尔滨工程大学水声工程学院,哈尔滨150001

出　　处：《声学学报》2023年第6期1128-1141,共14页Acta Acustica

基　　金：国防重点实验室基金项目(6142109200202);水声技术重点实验室项目(JCKYS2021604SSJS015)资助。

摘　　要：提出基于波数能量频域扩展特征的水面水下目标分辨方法,通过模态域波束形成计算频率波数谱,并根据环境信息建立目标深度与波数扩展差异间的映射关系,并以此作为判决模型实现目标深度辨识。仿真结果表明所提方法在目标方位预估不准时依然稳健。通过SWellEx-96数据和大连海域实测数据验证了本文所提方法的有效性,海上试验数据处理结果表明该方法在132 m水平阵纵向有效孔径、100~800 Hz处理频段条件下,初步具备了水面水下目标分辨能力,且水面目标波数扩展特征高出水下目标10°左右,两类目标差异明显。从声传播特性的角度,所提方法为解决目标深度辨识难题提供了新的思路。A discrimination method between submerged and surface targets is proposed based on wavenumber energy frequency domain extension features.The frequency wavenumber spectrum is calculated through modal domain beamforming,and a mapping relationship between target depth and wavenumber extension differences is established based on environmental information,which is used as a decision model to achieve target depth identification.The simulation results show that the proposed method is still robust when the target azimuth estimation is not accurate.The effectiveness of the method was verified through SWellEx-96 data and measured data in the Dalian sea area.The processing results of sea trial data showed that the method has preliminary ability to distinguish surface and submerged targets under the conditions of a 132 m horizontal array longitudinal effective aperture and 100−800 Hz processing frequency band.The wavenumber expansion feature of the surface target is about 10°higher than that of the submerged target,and the difference between the two types of targets is significant.From the perspective of sound propagation characteristics,the proposed approach provides new solution to the problem of target depth discrimination.

关 键 词：水平阵信号处理 水面水下目标分辨 简正波 频率波数谱 

分 类 号：TB56[交通运输工程—水声工程]