SENSOR NETWORK SYSTEM

PROBLEM TO BE SOLVED: To immediately construct a network by grasping the location of each sensor constituting a sensor network. SOLUTION: Each sensor constituting first and second sensor groups is provided with a self-position measuring means by a GPS (global positioning system) and measures a self-position. Self-positions are sequentially transmitted by radio waves through a sensor network constructed by ad hoc communication, an optical beam communication means transmits the self-positions from the second sensor group to a communication station, and the communication station records the self-positions. The communication station quickly grasps the position of each sensor. The communication station uses wide-angle communication from the second sensor and can easily establish connection. A position information correcting means obtains an accurate position about a position obtained by the self-position measuring means, the correction of the position is performed on the basis of to an area surrounded by positioning data at a plurality of reference points and to an area surrounded with the plurality of position reference points, and the position can be evaluated with very correct accuracy. In an optical beam communication network, laser beams are used to make long distance communication possible. COPYRIGHT: (C)2006,JPO&NCIPI