Over millions of years, porpoises have developed powerful biosonar with high accuracy and intelligence to detect and track prey in noisy underwater environments. The sound source in a porpoise is about one half of the wavelength of its emitted acoustic waves. According to textbook sonar theories, it is difficult to control the directional sound waves for target detection. Porpoises, with remarkable sonar detection capabilities, have been known as a natural legend of echolocation, but how to reconstruct their acoustic super-structures has been a huge challenge for artificial design.
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Source: Phys.org