Patent ID: 9530031
Filing Date: 2016-12-27
CPC Classification: G01S,G06K,H01Q

Claim Text:
1. A position detection system comprising: a non-transitory electromagnetic wave propagation medium extending in a propagation direction of an electromagnetic wave and having an electromagnetic wave propagation space sandwiched between conductors in a direction perpendicular to the propagation direction; and a plurality of communication devices placed near the non-transitory electromagnetic wave propagation medium, wherein the plurality of communication devices include a first communication device whose position is known in advance, wherein the first communication device transmits a first position detection signal through the non-transitory electromagnetic wave propagation medium to the plurality of communication devices other than the first communication device and detects positions of a plurality of the communication devices other than the first communication device based on reception signal strength of the first position detection signal, and wherein the first position detection signal is different in frequency from a communication signal used for communication carried out between the plurality of communication devices through the non-transitory electromagnetic wave propagation medium, and is attenuated more heavily during its propagation through the non-transitory electromagnetic wave propagation medium than the communication signal.