Patent ID: 7411551

Claim:
A wireless positioning system comprising: a target device that is an object of wireless positioning, a plurality of beacon devices and a processing unit; (a) each of the beacon devices having at least a wireless signal transmission module, a wireless signal reception module and a counter module, wherein each of the beacon devices is configured to transmit a wireless signal using the wireless signal transmission module, and configured to sense reception time points of wireless signals that are transmitted from the other beacon devices and the target device and received at time points after the transmission of the wireless signal using the counter module; (b) the target device having at least a wireless signal transmission module and a wireless reception module, wherein the target device is configured to transmit the wireless signal to the plurality of beacon devices after ordered transmissions of the wireless signals by all of the plurality of beacon devices; and (c) the processing unit is configured to obtain the position of the target device by calculating distances between the plurality of beacon devices and the target device is configured to use information about reception time points of the wireless signals according to the ordered transmissions and the wireless signal transmitted by the target device, sensed by the respective beacon devices.