| 二维解卷积波束形成水下高分辨三维声成像 |
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| 引用本文： | 王朋,迟骋,纪永强,黄勇,刘纪元,黄海宁.二维解卷积波束形成水下高分辨三维声成像[J].声学学报,2019,44(4):613-625. |
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| 作者姓名： | 王朋 迟骋 纪永强 黄勇 刘纪元 黄海宁 |
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| 作者单位： | 1. 中国科学院声学研究所 北京 100190; |
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| 基金项目： | 青年英才基金项目(QNYC201803)资助 |
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| 摘 要： | 针对水下三维成像的空间分辨率难以提高,且具有较高旁瓣级的问题,提出了一种二维解卷积波束形成高分辨三维声成像算法,该算法首先完成任意距离切片的平面阵波束形成,近场情况下采用菲涅尔近似实现近场平面阵波束形成,然后通过二维解卷积技术对任意距离切片的二维波束形成结果进行解卷积处理,去除阵列指向性函数的影响,改善波束响应非理想冲击函数所造成波束形成主瓣宽及旁瓣级高的问题。通过计算机仿真分析,新算法可以有效的提高水下三维成像的空间分辨率,抑制旁瓣级,并能够在较宽频带和不同阵列孔径内保持与常规波束形成相当的稳定性。通过试验研究,新方法比常规波束形成实际目标成像分辨率提高一倍,最高旁瓣级下降20 dB,验证了该算法在实际系统中的有效性.
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| 关 键 词： | 水声成像 声纳信号处理 三维声成像技术 解卷积算法 |
| 收稿时间： | 2018-10-30 |
Two-dimensional deconvolved beamforming for high-resolution underwater three-dimensional acoustical imaging |
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| Affiliation: | 1. Institute of Acoustics, Chinese Academy of Sciences Beijing 100190;2. National University of Singapore Singapore 119227;3. System Engineering Research Institute of CSSC Beijing 100094 |
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| Abstract: | The Underwater Three-dimensional imaging sonar based on the Conventional Beamforming suffers from fat beams and high-level sidelobes.The two-dimensional decovonvolved beamforming algorithm is proposed to improve the imaging resolution of three-dimensional imaging sonar.The algorithm completes the planar array beamforming for all distance slices,and realizes the near-field planar array beamforming using Fresnel approximation.Then,the twodimensional deconvolution techniqueis applied to the beam power to obtain high-resolution and suppress the sidelobe level caused by the beam response which is non ideal impulse function.The computer simulations demonstrate that the proposed method is efficient to enhance the spatial resolution and suppress the sidelobe level of the underwater 3D imaging,at the same time,to retain the robustness like conventional beamforming at wideband and different array aperture conditions.Through the experimental study of the prototype,the spatial resolution is increased by one time and the sidelobe level is reduced by 20 dB using the proposed method. |
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