Views: 1 Author: Site Editor Publish Time: 2021-04-25 Origin: Site
Principle of Ultrasound
Like many ultrasonic sensing applications, UAV landing assistance systems use the time-of-flight (ToF) principle. ToF is an estimate of the round-trip time of the ultrasonic waves emitted from the sensor to the target object and then reflected from the object back to the ultrasonic sensor.
Why use ultrasonic sensing for drone landing?
Although numerous sensing technologies can detect the proximity of objects, ultrasonic transducer wind vane can perform well in terms of detection distance, solution cost, and reliability of different surfaces when the drone is landing. The common requirement for UAV ground tracking and landing is to be able to reliably detect a distance of 5 meters above the ground. Assuming correct signal conditioning and processing, ultrasonic weather transducer in the 40-60kHz range can usually meet this range.
In order to effectively measure objects during ringing, many drone designers install separate sensors for the transmitter and receiver. By separating the receiver, the drone can detect objects during the excitation of the transmitter. Therefore, ultrasonic wind sensor has superior near-field detection performance-as low as 5cm or less.Ultrasonic sensing technology is also a cost-competitive technology, especially when using integrated solutions, which already includes most of the required chips. Which can either use half-bridge or H-bridge to drive the sensor directly, or piezoelectric ultrasonic transducer use a transformer to drive the sensor; the latter is mainly used for sealed "closed" ultrasonic sensors.
