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Dynamic echo signatures created by a biomimetic sonar head.
Bioinspiration & Biomimetics ( IF 3.1 ) Pub Date : 2019-10-01 , DOI: 10.1088/1748-3190/ab496a
Joseph Sutlive 1 , Rolf Müller
Affiliation  

Certain bat species (e.g. horseshoe bats, family Rhinolophidae) are known for conspicuous deformations of the emission baffles (noseleaves) and reception baffles (ears). Previously reported numerical studies and experiments with biomimetic reproductions of these baffles have shown that such deformations can result in time-variant emitter/receiver characteristics. However, it has not been investigated whether these time-variant characteristics could also manifest themselves in likewise time-variant properties in echoes from targets of varying complexity. To investigate this question, a biomimetic sonar head complete with deformable emission and reception baffles has been used to ensonify targets with different simple geometries (sphere, cylinder, and cube) as well as random, more natural target geometries (artificial plants) from distances of about 1 meter. Time-variant echo signatures were found in all these cases, i.e. irrespective of target complexity and whether the time-variance was injected into the emission, the reception, or into both. This demonstrates that although the time-variant emission/reception characteristics had been previously measured only under careful conditions, they are capable of impacting real-world echoes. Even targets with distributed clouds of scattering facets did not obscure the effects of the changing conformation states. Hence these changes in ear position created by baffle deformations could serve the animals or man-made sonar systems that mimic them to encode additional echo information through time-variant echo signatures.

中文翻译:

由仿生声纳头创建的动态回声签名。

已知某些蝙蝠种类(例如,马蹄蝙蝠,犀科科)会导致发射挡板(鼻翼)和接收挡板(耳)明显变形。以前报道的数值研究和对这些挡板仿生复制的实验表明,这种变形会导致发射器/接收器的时变特性。但是,尚未研究这些时变特性是否也可以在来自复杂程度不同的目标的回波中同样表现为时变特性。为了研究这个问题,已使用具有可变形发射和接收挡板的仿生声纳头来使具有不同简单几何形状(球体,圆柱体和立方体)以及随机,距离约1米的距离,可以找到更自然的目标几何形状(人工植物)。在所有这些情况下都发现了时变回波签名,即与目标复杂性以及时变是否注入发射,接收或两者都无关。这表明尽管时变发射/接收特性以前仅在谨慎的条件下进行过测量,但它们能够影响真实世界的回声。甚至具有分散小面的分布云的目标也不会掩盖不断变化的构象状态的影响。因此,由挡板变形产生的这些耳朵位置变化可以为模仿它们的动物或人造声纳系统提供服务,它们可以通过时变回波签名来编码其他回波信息。在所有这些情况下都发现了时变回波签名,即与目标复杂性以及时变是否注入发射,接收或两者都无关。这表明尽管时变发射/接收特性以前仅在谨慎的条件下进行过测量,但它们能够影响真实世界的回声。甚至具有分散小面的分布云的目标也不会掩盖不断变化的构象状态的影响。因此,由挡板变形产生的这些耳朵位置变化可以为模仿它们的动物或人造声纳系统提供服务,它们可以通过时变回波签名来编码其他回波信息。在所有这些情况下都发现了时变回波签名,即与目标复杂性以及时变是否注入发射,接收或两者都无关。这表明尽管时变发射/接收特性以前仅在谨慎的条件下进行过测量,但它们能够影响真实世界的回声。甚至具有分散小面的分布云的目标也不会掩盖不断变化的构象状态的影响。因此,由挡板变形产生的这些耳朵位置变化可以为动物或人造声纳系统提供服务,它们可以模仿它们通过时变回波签名来编码其他回波信息。这表明尽管时变发射/接收特性以前仅在谨慎的条件下进行过测量,但它们能够影响真实世界的回声。甚至具有分散小面的分布云的目标也不会掩盖不断变化的构象状态的影响。因此,由挡板变形产生的这些耳朵位置变化可以为模仿它们的动物或人造声纳系统提供服务,它们可以通过时变回波签名来编码其他回波信息。这表明尽管时变发射/接收特性以前仅在谨慎的条件下进行过测量,但它们能够影响真实世界的回声。甚至具有分散小面的分布云的目标也不会掩盖不断变化的构象状态的影响。因此,由挡板变形产生的这些耳朵位置变化可以为模仿它们的动物或人造声纳系统提供服务,它们可以通过时变回波签名来编码其他回波信息。
更新日期:2019-11-01
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