Abstract
The biosonar system of horseshoe bats (family Rhinolophidae) has been shown to employ unusual dynamics upon the emission as well as the reception of the ultrasonic pulses. Non-rigid changes to the shapes of the noseleaves (emission baffles) as well as the outer ears (pinnae, reception baffles) have been demonstrated to affect the properties of the emitted and received ultrasonic signals. These effects have been found in the results of numerical simulations as well as experimentation with physical prototypes. In the present work, a next-generation prototype of a biomimetic sonar head inspired by horseshoe bats is being developed. The goals for this system are to create more comprehensive and life-like dynamic baffle shape geometries as well as a better acoustic coupling between the ultrasonic transducers and the time-variant baffle shapes. Particular attention has been paid to geometry of the transition between nostrils and the noseleaf baffle. A single biomimetic system that incorporates these dynamic emission and reception baffles will enable an experimental investigation of how these two dynamic stages could be used in an integrated fashion to enhance sonar performance in real-world sonar sensing scenarios.
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