Title
Bio-inspired sonar antennae: enhancing directivity patterns for localization Bio-inspired sonar antennae: enhancing directivity patterns for localization
Author
Faculty/Department
Faculty of Applied Economics
Publication type
conferenceObject
Publication
Arizona , [*]
Subject
Biology
Source (book)
2nd IEEE RAS-EMBS International Conference on Biomedical Robotics and Biomechatronics
ISI
000270540400061
ISBN
978-1-4244-2882-3
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
We present results of a biologically inspired method to enhance a sonar transducer's directivity pattern for localization purposes. We show that an artificial pinna structure mounted over a transducer introduces features in its head related transfer function that are more interesting for localization than those in the basic piston-like directivity pattern of common ultrasonic transducers. We measured the directivity pattern of several transducer-pinna assemblies using a biologically inspired robotic bat head. We compare the measured head related transfer function of a larger (empty set10mm) electromechanical film sensor with that of a much smaller commercially available electret condenser microphone, both with and without pinna. We investigate the added spatial filtering of a tragus or a ripple pattern in the pinna structure. We build monaural elevation template sets from the measured head related transfer functions and use an intertemplate distance metric to show that mounting a pinna structure over the receiving transducers makes these templates more suitable for localization.
E-info
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