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在海豚的回声定位系统中自动增强控制

Whitlow W L Au¹, Kelly J Benoit-Bird

¹Hawaii Institute of Marine Biology, University of Hawaii, PO Box 1106, Kailua, Hawaii 96734, USA. wau@hawaii.edu

|June 20, 2003

概括

海豚在回声定位中使用独特的自动增强控制,通过调整传输幅度而不是接收器增强来调整回声定位. 这弥补了声学损失,确保了来自鱼群等目标的一致回声.

科学领域:

海洋生物学海洋生物学
生物声学是一种生物声学.
动物声纳仪动物声纳仪

背景情况:

蝙蝠和技术声纳使用接收器增益控制来管理声学传播损失.
以前人们认为海豚回声定位缺乏自动增强控制机制.

研究的目的:

调查在自由活动的回声定位海豚中自动增强控制的存在和机制.
挑战对海豚声纳系统的现有理解.

主要方法:

现场测量是在自由活动的海豚身上进行的.
分析了与目标范围相关的回声定位信号幅度.

主要成果:

海豚拥有自动增强控制机制.
这种控制是在信号传输期间应用的,而不是接收.
超声定位信号的振幅随着目标范围 (R) 在 20 log (R) 模式中增加.
当海豚接近时,鱼群的回声保持不变,模仿时间变化的收益.

结论:

海豚回声定位采用基于传输的自动增益控制来补偿声传播损失.
这种机制确保目标的回声强度一致,类似于人工声纳系统.

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