| 利用自相关函数warping变换的浅海声源深度判别 |
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| 引用本文： | 刘志韬,郭良浩,闫超.利用自相关函数warping变换的浅海声源深度判别[J].声学学报,2019,44(1):28-38. |
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| 作者姓名： | 刘志韬 郭良浩 闫超 |
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| 作者单位： | 1. 中国科学院声学研究所 声场声信息国家重点实验室 北京 100190; |
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| 基金项目： | 国家自然科学基金项目(61571436)资助 |
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| 摘 要： | 针对浅海波导声源深度判别问题,提出了一种利用warping变换提取接收信号简正波相关项的深度判别方法。对接收信号自相关函数做warping变换,分离其简正波相关项,利用能量占主导的简正波相关项特征频率之间的比例关系,确定其号数,从而分辨水面声源和水下声源。公式推导和数值仿真结果说明:不同深度声源激发的能量占主导的简正波相关项特征频率不同,可以用于判别声源深度。海试实验结果证明:在海水声速随深度不变或缓变的水文环境,低频条件下,该方法可以分离简正波相关项并确定其号数,在未知声源距离的情况下有效进行声源深度判别,且无须声源相对接收器运动。
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| 关 键 词： | 深度判别 warping变换 简正波相关项 特征频率 |
| 收稿时间： | 2017-02-21 |
Source depth discrimination in shallow water based on relation formula warping transform |
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| Affiliation: | 1. State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences Beijing 100190;2. University of Chinese Academy of Sciences Beijing 100049 |
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| Abstract: | Aiming at the topic of source depth discrimination in shallow water. An approach which is used to extract the relation items of modes from the received signal's relation formula by warping transform is present. The received signal's relation formula is warped to obtain its relation items of modes. Using the proportion relationship between the characteristic frequencies of the relation items whose energy is dominant to determine the numbers, the depth of the source can be identified. The formula derivation and simulation results provide that the characteristic frequencies of the relation items aroused by sources in different depths are not the same. The experimental results prove its effectiveness.Under the condition of approximate constant velocity profile and low frequency, the method can be used to determine the depth of the source by extracting the relation items of modes and recognizing its number, in the case of unknown sound source range. The movement of the source is not necessary. |
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