Method of measuring inter-device relative coordinates and device using the same

A device for measuring relative coordinates between a plurality of devices belonging to the same group, the device comprising:

• a communication module performing communication with a plurality of other devices belonging to the same group;
• an IMU module configured to calculate coordinates of the device with respect to a reference origin according to a Pedestrian Dead Reckoning (PDR) technique;
• a processor;
• and
• a memory that stores at least one command executed through the processor,
• wherein the at least one command includes:
• a command allowing a range between the device and another device to be measured through communication with the other device;
• a command allowing range information between the plurality of other devices to be received from the other device;
• a command allowing a plurality of solutions for inter-device relative coordinates to be calculated using range information between the plurality of devices belonging to the same group;
• and
• a command allowing a true solution among the plurality of solutions for the inter-device relative coordinates to be deduced using coordinates of each of the devices with respect to the reference origin that are calculated using the PDR technique.