Development of an Acoustic Lens for an Imaging Sonar for Autonomous Underwater Vehicle “Urashima” and Experimentation in a Water Tank
Development of an Acoustic Lens for an Imaging Sonar for Autonomous Underwater Vehicle “Urashima” and Experimentation in a Water Tank
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自主水下航行器“浦岛”成像声纳声学透镜的开发及水箱实验
DOI：
10.1143/jjap.41.3970
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发表时间：
2002
影响因子：
1.5
通讯作者：
Hiroaki Noda
中科院分区：
文献类型：
--
作者：
S. Tsukioka;T. Aoki;H. Ochi;T. Shimura;T. Sawa;Toshiaki Nakamura;T. Anada;Ieharu Kaihou;Hiroaki Noda
水下成像声纳是为“浦岛”自主水下航行器（AUV）的避障和导航而开发的。利用声透镜获得目标的声图像、距离和方位角。在目标上发射和散射音爆声波，并在二维接收阵列上产生目标的直接图像。声透镜系统的优点是可以省去对每个单元接收到的信号进行处理以形成二维波束所需的大量计算，并且减小了设备尺寸。本文介绍了单球面透镜成像声纳的总体结构和水缸声透镜的实验结果。然后，介绍了利用抛物方程法对透镜声场进行理论计算的方法，作为改进透镜性能解决分辨率和像差问题的有效工具。
Underwater imaging sonar has been developed for obstacle avoidance and navigation of the autonomous underwater vehicle (AUV) “URASHIMA”. The acoustic image, the distance and the azimuth of the target are obtained using an acoustic lens. Tone burst acoustic waves are transmitted and scattered at the target, and a direct image of the target can be created on a two-dimensional receiving array. The merits of the acoustic lens system are the possibility to omit the extensive calculation required for signal processing of received signals at each element to form two-dimensional beams, and reduction of equipment size. In this report, the outline of the imaging sonar with a single spherical lens and the experimental results for the acoustic lens in a water tank are presented. Then, theoretical calculation of the sound field through the lens using the parabolic equation method is introduced as a useful tool for improvement of lens performance to solve problems in resolution and aberration.