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8.5 Ultrasonic Avoiding Obstacles
8.5.1 Ultrasonic Ranging
1) Description
There is an animal called bat in nature. The bats can fly at night, not depend on its eyes, but on its ears and
vocal organs. When the bat flies, it will emit a scream, an ultrasonic signal that humans cannot hear because of
its high audio frequency. If these ultrasonic signals hit other objects on the flight path, they will be reflected back
immediately. After receive the returned information, the bats complete the whole process of listening, seeing,
calculating and bypassing obstacles during the flutter.
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