Ultrasonic switch based on pattern recognition and control method thereof

Abstract

The invention discloses an ultrasonic switch based on pattern recognition and a control method thereof. The switch comprises a central processor, a transmitting loop and a receiving loop connected with the central processor, and an output drive and a power supply; the control method comprises the following step of adopting double models, namely a continuous wave frequency domain measurement and a pulse time space measurement to detect a moving object, thereby controlling on or off of an external device. The switch and control method thereof disclosed by the invention can perform dynamic target pre-warning and speed detecting on the moving object and can estimate the size of the object, measure the movement speed, the acceleration and the movement direction; by adopting the pattern recognition, various disturbances can be effectively filtered, and the reliability and practicality of the ultrasonic switch can be greatly improved; meanwhile, the switch and the method have a higher performance price ratio, the energy consumption can be greatly reduced after using the switch and the method, thus, both considerable energy saving benefit and environmentally-friendly benefit can be produced.

Description

technical field [0001] The invention relates to a switch and a control method thereof, in particular to an ultrasonic switch based on pattern recognition and a control method thereof. Background technique [0002] At present, various sensors and switches using ultrasonic principles can be divided into two categories: one is to transmit pulse signals, and use the echo of reflective objects to judge whether there are objects around. This kind of scheme is not suitable for use in corridors and offices. , shopping malls and other environments with complex reflectors; the other is to emit continuous waves, using the characteristics that moving objects will cause Doppler frequency shifts in reflected waves to judge whether there is an object approaching. Since it can only detect whether the object is moving or not, the actual In application, it is often disturbed by small animals, plants, curtains and other objects, resulting in misjudgment. Contents of the invention [0003] P...

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Problems solved by technology

[0002] At present, various sensors and switches using ultrasonic principles can be divided into two categories: one is to transmit pulse signals, and use the echo of reflective objects to judge whether there are objects around. This kind of scheme is not suitable for use in corridors and offices. , shopping malls and other environments with complex reflectors; the other is to emit continuous waves, using the characteristics that moving objects will cause Doppler frequency shifts in reflected waves to judge whether there is an object approaching. Since it can only detect whether the object is moving or not, the actual In application, it is often disturbed by small animals, plants, curtains and other objects, resulting in misjudgment

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