Robot system

A robot system comprising:

• a position information emitting unit comprising a light emitter to emit light comprising phase information;
• and
• a robot comprising a light receiver to receive the light emitted from the light emitter, a position determining part to determine a phase of the robot with respect to the position information emitting unit based on the phase information of the light received through the light receiver, and a proceeding direction detector to detect a proceeding direction of the robot based on an incident angle of the light emitted from the light emitter.

A position information emitting unit to determine a position of a robot, the position information emitting unit comprising:

• a supersonic wave emitter to emit a supersonic wave to determine a distance from the robot;
• and
• a light emitter to emit light encoded with phase information at a plurality of angles to determine an angle with respect to the robot.