Patent ID: 7474646
Filing Date: 2009-01-06
Classification: G01S,H04W,Y02D

Abstract:
1. A wireless communication system comprising: a plurality of nodes that mutually communicate, said plurality of nodes including at least one node which has a battery therein that supplies power internally, said at least one node measuring a status of the battery therein, and notifying a server of the measured status of the battery therein; and said server which detects a position of said at least one node using communication between said plurality of nodes, determines a position detection method for said at least one node based upon the measured status of the battery of said at least one node, and calculates said position of said at least one node by the determined position detection method, wherein: said at least one node sends a synchronizing signal used for the synchronization of time between said plurality of nodes and an observation signal used for the measurement of distance between others of said plurality of nodes and said at least one node; at least a second of said plurality of nodes receives the synchronizing signal and the observation signal from said at least one node; and said server calculates the position of said at least one node based upon difference between time at which said at least a second of said plurality of nodes receives the synchronizing signal and time at which said at least a second of said plurality of nodes receives the observation signal.