Abstract: A gesture recognition device is related. The gesture recognition device includes a controlling module, a gesture detecting module configured to detect the position of the hand to obtain the data of the hand position, a calculating module configured to calculate the data of the hand position, a recognizing module configured to recognize the gesture, and a communication module. The gesture detecting module includes a 3-dimensional (3D) sensor for hand motion capture. A man-machine interaction system using the gesture recognition device is also related.

Abstract: An obstacle avoidance system based on sonar for an unmanned aerial vehicle includes an electric motor, a single sonar module, and a control panel. The sonar module rotates with the electric motor. The control panel controls a rotation of the electric motor, thereby controlling the direction in which obstacles to the flight of the unmanned aerial vehicle are detected by the sonar module. The unmanned aerial vehicle includes a fuselage, the sonar obstacle avoidance system, and an aerial vehicle controller. A sonar obstacle avoidance method is also disclosed.

Abstract: The disclosure relates to an indoor positioning method performed by an indoor positioning system installed on an object inside of a building. The indoor positioning system includes a gyroscope, a digital compass, an accelerometer, a distance sensor and a processor; an indoor map of the building is stored in the processor. Dead reckoning is performed to obtain an estimated position of the object on the map. An target area around the estimated position is selected on the map. Several measurements between the object and walls of the building are performed to obtain an actual distance data. The unique point inside the target area which matches the actual distance data is used the actual position of the object.

Abstract: The disclosure relates to an indoor positioning method performed by an indoor positioning system installed on an object inside of a building. The indoor positioning system includes a gyroscope, a digital compass, an accelerometer, a distance sensor and a processor; an indoor map of the building is stored in the processor. Dead reckoning is performed to obtain an estimated position of the object on the map. An target area around the estimated position is selected on the map. Several measurements between the object and walls of the building are performed to obtain an actual distance data. The unique point inside the target area which matches the actual distance data is used the actual position of the object.

Abstract: An obstacle avoidance system based on sonar for an unmanned aerial vehicle includes an electric motor, a single sonar module, and a control panel. The sonar module rotates with the electric motor. The control panel controls a rotation of the electric motor, thereby controlling the direction in which obstacles to the flight of the unmanned aerial vehicle are detected by the sonar module. The unmanned aerial vehicle includes a fuselage, the sonar obstacle avoidance system, and an aerial vehicle controller. A sonar obstacle avoidance method is also disclosed.