Patent ID: 8542368

Claim:
A position measuring method, which measures a position based on information provided from at least one communication device including a transmission light source, the method comprising: acquiring precise position information indicating a position of the transmission light source by capturing an image including an optical signal transmitted from the transmission light source; calculating an actual light source distance between transmission light sources based on the precise position information; calculating a virtual light source distance between the transmission light sources imaged on the image sensor from the captured image; measuring inclination of the image sensor; and measuring a position based on the actual light source distance, the virtual light source distance, and the inclination, wherein the position measuring comprises: calculating a first virtual light source distance between the transmission light sources imaged on the image sensor, and a second virtual light source distance corresponding to a parallel state of the image sensor based on the inclination; and calculating the position based on the second virtual light source distance, the actual light source distance, and the received precise position information about each transmission light source.