海洋测绘2017，Vol.37Issue(6)：30-34,5.DOI:10.3969/j.issn.1671-3044.2017.06.008
拖曳声源深海传播损失算法改进
The Improved Algorithm for Transmission Loss of Deep Sea Acoustic Investigation by Towed Sound Source
摘要
Abstract
In order to calculate the underwater acoustic TL (transmission loss) efficiently and precisely and satisfy the engineering application,a research on improving the TL algorithm of towed sound source is conducted in the paper,by using the acoustic investigation data in a deep sea area of South China Sea.Firstly,the signal time series are analyzed.The result shows that the multi-channel structure of the signal which can be classified into direct-arrival wave,the first and second seabed reflection wave is notable,and their amplitudes decreases gradually.The wave reflected from the sea surface coincides with the direct-arrival wave.Doppler frequency shift,which is resulted from the moving of the towed sound source,influences on the target signal.The ‘singlefrequency’ sine signal is not absolutely single frequency but a narrowband power spectral,and its spectral peak corresponds to the center frequency of the target signal.Then the algorithm is improved in two aspects:signal detection and multi-channel effects.Band-pass cutoff frequency of Butterworth filter is designed according to the power spectral,which is used to filter the noise signal in frequency field.The rule for discriminating the noise signal is established with voltage value,which can be used to get rid of noise signal of the same frequency band with the target signal.The results show that the improved algorithm well fits for calculation of the towed sound source signal energy at low SNR (signal-to-noise ratio) environment,and obtains the precise TL fast.关键词
深海水声调查/拖曳声源/传播损失/多途效应/多普勒效应/带通滤波Key words
deep sea acoustic investigation/towed sound source/TL/multi-channel effects/Doppler effects/band-pass filter分类
海洋科学引用本文复制引用
高飞,潘长明,孙磊,王川,胡治国,常哲..拖曳声源深海传播损失算法改进[J].海洋测绘,2017,37(6):30-34,5.基金项目
国家自然科学基金(41406004). （41406004）
