Most bats also have a keen auditory orientation (or echolocation) system, which can emit ultrasonic waves through the throat, and then identify the direction and detect the target according to the response of the ultrasonic waves. Some kinds of faces have evolved special structures to increase sonar reception, such as nose wings, wrinkled faces and complex big ears.
Extended data:
The origin of radar:
The appearance of radar was due to the war between Britain and Germany during World War I, and Britain urgently needed a radar (technology) that could detect metal objects in the air and help search for German aircraft in anti-air strikes. During World War II, radar technology with the functions of ground-to-air, air-to-ground (search) bombing, air-to-air (interception) fire control and friend or foe identification appeared.
After World War II, radar developed new radar systems, such as monopulse angle tracking, pulse Doppler signal processing, high-resolution synthetic aperture and pulse compression, friend-or-foe identification combined system, computer automatic fire control system, terrain avoidance and terrain following, passive or active phased array, frequency agility and multi-target detection and tracking.
Later, with the scientific progress in microelectronics and other fields and the continuous development of radar technology, its connotation and research content are also expanding. The detection means of radar has developed from only one detector in the past to the integration and cooperation of various optical detection means such as infrared light, ultraviolet light and laser.
Baidu encyclopedia -bat
Baidu encyclopedia-radar