| 深海海底反射区声场角谱域分布结构分析及在声纳波束俯仰上的应用 |
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| 引用本文： | 韩志斌,彭朝晖,刘雄厚.深海海底反射区声场角谱域分布结构分析及在声纳波束俯仰上的应用[J].物理学报,2020(11):125-136. |
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| 作者姓名： | 韩志斌 彭朝晖 刘雄厚 |
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| 作者单位： | 中国科学院大学;中国科学院声学研究所;中国人民解放军92578部队;西北工业大学航海学院 |
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| 基金项目： | 国家自然科学基金(批准号:11434012)资助的课题. |
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| 摘 要： | 深海海底反射区的声场干涉导致能量起伏,存在不连续的若干声纳可探测区.主动声纳探测海底反射区目标时,必须建立起声纳可探测区与波束俯仰角间的量化关系,通过合理选择最优发射波束俯仰角,才能使其对准声纳可探测区.本文通过理论分析和数值仿真,指出海底反射区离散的声纳可探测区的形成与不同掠射角声线能量周期性起伏直接相关,当主动声纳波束俯仰角与某个声线能量峰值对应的出射角一致时,可保证在一个对应的声纳可探测区内获得高的发射阵增益.在此基础上,通过声线干涉理论建立了声线能量峰值和出射角的量化关系,并提出一种脉冲串信号形式,包含多个可对准各声线能量峰值的子脉冲,每个子脉冲可保证照射到一个声纳可探测区,整个脉冲串发射时可在海底反射区的全部声纳可探测区内均取得高的发射阵增益.经仿真验证,该方法探测效果好,稳健性高,具有良好的应用前景.
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| 关 键 词： | 主动声纳 海底反射区 波束俯仰 角谱域 |
Analysis of sound field distribution of angle dimension in deep ocean bottom bounce area and its application to active sonar vertical beam pitch |
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| Han Zhi-Bin,Peng Zhao-Hui,Liu Xiong-Hou.Analysis of sound field distribution of angle dimension in deep ocean bottom bounce area and its application to active sonar vertical beam pitch[J].Acta Physica Sinica,2020(11):125-136. |
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| Authors: | Han Zhi-Bin Peng Zhao-Hui Liu Xiong-Hou |
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| Affiliation: | (University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Acoustics,Institute of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;Unit 92578 of the People’s Liberation Army of China,Beijing 100161,China;School of Marine Science and Technology,Northwestern Polytechnical University,Xi’an 710129,China) |
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| Abstract: | In the deep ocean environment,the sound energy from the direct path is very hard to illuminate a target located in the shadow zone.To solve the problem,the bottom bouncing technique,in which the vertical transmitting beamforming and the bottom bouncing are used to illuminate the target in the shadow zone,provides a potential way.However,due to the sound field interference in the bottom bouncing area in the deep ocean environment,the sound energy in the bottom bouncing area is fluctuant,which produces several discrete detectable areas.In order to detect underwater targets in these areas when using an active sonar with a transmitting vertical linear array,the selecting of reasonable vertical transmitting beam angles is necessary.Therefore,the relationship between the discrete detectable area and the transmitting vertical angle in deep ocean is very important for the active sonar using a transmitting vertical linear array.In this paper,it is shown that the sound field fluctuation in the bottom bouncing area is due to the energy fluctuation of the rays having different grazing angles.And the active sonar can achieve high noise gain in a detectable area when the vertical transmitting angle is equal to the grazing angle of the sound ray with the peak energy.To obtain a high noise gain of the active sonar using the vertical transmitting array,an efficient method to estimate the grazing angle of sound rays with peak energy according to the sound field distribution of angle dimension is proposed,which is helpful for selecting a group of best vertical transmitting angles.Meanwhile,a transmitting signal which contains a group of subpulses is designed.Furthermore,each subpulse is applied to the whole transmitting array by using the vertical steering to illuminate a certain detectable area in the bottom bouncing area.By doing so,a subpulse steered to the previously selected vertical angle will ensure a high transmitting array gain in a detectable area,and all of pulses will illuminate the whole detectable areas with high array gains almost simultaneously.Numerical simulations show that the proposed method is stable and efficient,and has good noise gain in the shadow zone(where almost no direct path exists)in the deep ocean environment. |
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| Keywords: | active sonar bottom bounce area vertical beam pitch angle dimension |
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