Positioning system and method thereof

A positioning system, comprising:

• a first electronic apparatus, comprising:
• an ultrasound emitter, configured for sending an ultrasonic signal;
• an optical sensor;
• and
• a processor coupled to the ultrasound emitter and the optical sensor;
• a second electronic apparatus, comprising:
• a plurality of ultrasound sensors, configured for sensing the ultrasonic signal sent from the first electronic apparatus;
• and
• a first light emitting unit, configured for emitting a plurality of radiations when the ultrasonic signal is sensed by the ultrasound sensors;
• wherein, the optical sensor is configured to sense the radiations, the processor is configured to calculate a plurality of first time periods started from the ultrasonic signal is sent until the radiations are sensed by the optical sensor, to determine a plurality of first relative distances between the ultrasound sensors of the second electronic apparatus and the ultrasound emitter, and to locate a first relative position of the second electronic apparatus relative to the first electronic apparatus according to the first relative distances.

A positioning method, comprising:

• generating a radiation having a specific duty ratio:
• emitting the radiation from a first electronic apparatus to a second electronic apparatus and starting to accumulate a time count;
• sensing the radiation on the second electronic apparatus to determine whether or not the specific duty cycle of the radiation matches a first predetermined duty cycle;
• triggering a first ultrasound emitter on the second electronic apparatus to send a first ultrasonic signal to the first electronic apparatus when the specific duty cycle of the radiation matches the first predetermined duty cycle;
• sensing the first ultrasonic signal by a plurality of ultrasound sensors on the first electronic apparatus and calculating a plurality of first time periods started from the radiation is emitted until the first ultrasonic signal is sensed by the ultrasound sensors;
• calculating a plurality of first relative distances between the ultrasound sensors and the first ultrasound emitter on the second electronic apparatus;
• and
• locating a first relative position of the second electronic apparatus relative to the first electronic apparatus according to the first relative distances.