摘要
水下声探测是外国调查船和水下文物盗捞船进行非法调查和探测的主要技术手段,根据信号的主要声特征,对海洋水下声探测信号进行分类,分为宽带中、低频信号和窄带高频信号.在福建兴化湾海域采集了浅地层剖面仪信号、电火花声源信号、侧扫声纳信号和单频测深信号4种代表性的海洋水下声探测信号,根据声特征分析给出了对应的分类,其中:浅地层剖面仪信号为信号类型确定的中、低频信号;电火花声源信号为宽带脉冲中、低频信号;侧扫声纳信号和单频测深信号为窄带高频信号.通过对4种实测声探测数据的分析研究,给出了对应类型的海洋水下声探测信号的分析、提取方法,其中:信号类型确定的中低信号和窄带高频信号在初步的时、频分析基础上,可通过带通滤波提取;宽带脉冲中、低频信号在初步的时、频分析基础上,可尝试通过小波尺度相关滤波的方法提取.结合已知的水下声探测信号的主要声特征,实现对采集的海洋水下声探测信号的识别.
Underwater acoustic detection was an important technique used in illegal survey and detection by foreign survey ships and by ships of underwater cultural relics.The ocean underwater acoustic detection signals were classi-fied according to the acoustic characteristics of signals.It was divided into broadband middle and low frequency sig-nals and narrowband high frequency signals.Four representative ocean underwater acoustic detection signals of sub-bottom profiler signal,spark sound source signal,side scan sonar signal and single frequency bathymetric signal had been measured in Xinghua Bay,Fujian Province,according the acoustic characteristics and their corresponding classification had been given.Among them,the sub-bottom profile signal was the middle and low frequency signal and its signal type was determined.The spark sound source signal was also the middle and low frequency signal but its signal type was broadband pulse.The side scan sonar signal and single frequency bathymetric signal were nar-rowband high frequency signal.Through the analysis of 4 groups of measured acoustic detection data,the analysis and extracted methods of corresponding types of ocean underwater acoustic detection signals had been given.Among them,the middle and low frequency signal which its signal type was determined and narrowband high frequency sig-nal can be extracted by band-pass filtering based on time-frequency analysis,the broadband pulse middle and low frequency signal can be tested and extracted by wavelet scale correlation filtering method based on time-frequency analysis.Combined with the acoustic characteristics of the known underwater acoustic detection signals,the meas-ured ocean underwater acoustic detection signals can be identified.
出处
《应用海洋学学报》
CAS
CSCD
北大核心
2015年第2期272-278,共7页
Journal of Applied Oceanography
基金
国家海洋局海洋公益性行业科研专项经费资助项目(201305038)
关键词
海洋声学
水下声探测
信号
声特征
分类
识别
小波变换
尺度相关
marine acoustics
underwater acoustic detection
signal
acoustic characteristics
classification
dis-tinguish
wavelet transform
scale correlation
