本文選題：射線聲學(xué) + 次聲學(xué)��； 參考：《聲學(xué)學(xué)報(bào)》2016年05期

【摘要】：海底地形變化對與海底作用的聲反射區(qū)聲場空間相關(guān)性有重要影響。利用南中國海某深海海域的一次聲學(xué)實(shí)驗(yàn)數(shù)據(jù),對深海海底反射區(qū)的聲場空間相關(guān)性進(jìn)行了分析。實(shí)驗(yàn)觀測到,在距離聲源約29 km至35 km距離范圍處,不平海底環(huán)境下的水平縱向相關(guān)性出現(xiàn)了一些不同于平坦海底環(huán)境下的振蕩結(jié)構(gòu),利用射線聲學(xué)理論分析并解釋了這兩種不同海底環(huán)境產(chǎn)生水平縱向相關(guān)差異的原因。結(jié)果表明,在深海平坦海底方向一次海底反射到達(dá)區(qū),對聲場起主要貢獻(xiàn)的經(jīng)過一次海底反射聲線間的到達(dá)時(shí)間差隨著水平距離的增加而逐漸減少,從而干涉疊加后的相位差在[0,2π]內(nèi)發(fā)生周期性變化,導(dǎo)致該區(qū)域聲場的水平縱向相關(guān)性隨著間距增加呈周期性振蕩現(xiàn)象;而不平海底方向的海底小山丘恰對一次海底反射聲線的阻擋影響,不僅使得與平坦海底方向相同區(qū)域的聲傳播損失明顯增大,而且由于相對更多的本征聲線路徑的復(fù)雜多途干涉,該區(qū)域水平縱向相關(guān)性不再呈現(xiàn)明顯的振蕩周期,相關(guān)系數(shù)也有所下降。研究結(jié)果對于分析在深海復(fù)雜海底地形環(huán)境下的聲吶陣列探測性能具有重要意義。
[Abstract]:The variation of submarine topography has an important influence on the spatial correlation of acoustic field in the acoustic reflection region. Based on the acoustic experimental data of a deep sea area in the South China Sea, the spatial correlation of acoustic field in the deep sea reflection zone is analyzed. It has been observed experimentally that in the range of 29 km to 35 km from the sound source, there are some oscillatory structures in the horizontal longitudinal correlation under the uneven seabed environment, which are different from those in the flat seabed environment. The reasons for the horizontal longitudinal correlation between these two different seabed environments are analyzed and explained by means of ray acoustics theory. The results show that the time difference of arrival between the acoustic lines which contribute to the sound field is gradually decreased with the increase of horizontal distance in the area of a sea bottom reflection in the direction of deep sea flat seabed. Therefore, the phase difference after interference superposition changes periodically in [0 ~ 2 蟺], which causes the horizontal and longitudinal correlation of sound field in this region to oscillate periodically with the increase of spacing. However, the blocking effect of a small submarine hill with uneven undersea direction on a sea floor reflected sound line not only increases the sound propagation loss in the same area as the flat sea floor direction, but also increases the sound propagation loss in the same area as the flat sea floor. Moreover, because of more complex multipath interference of intrinsic sound path, the horizontal and longitudinal correlation of the region no longer presents an obvious oscillation period, and the correlation coefficient also decreases. The results are of great significance to the analysis of sonar array detection performance in the deep sea complex seabed terrain environment.
【作者單位】： 中國科學(xué)院聲學(xué)研究所聲場聲信息國家重點(diǎn)實(shí)驗(yàn)室;中國科學(xué)院大學(xué);中國科學(xué)院聲學(xué)研究所南海研究站;
【基金】：國家自然科學(xué)基金項(xiàng)目(11434012,41561144006,11174312,11404366)資助
【分類號】：P733.2

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