Patent ID: 8165833
Filing Date: 2012-04-24
Classification: G01R

Abstract:
1. A wireless sensor network system, comprising: a plurality of sensor nodes which are deployed at same distance in a two-dimensional plane and have sensing areas of same size; and at least one extra sensor node which has a sensing area of a smaller size than the sensing area of the plurality of sensor nodes to sense a gap area which is not covered by the sensing areas of the plurality of sensor nodes, wherein the plurality of sensor nodes are deployed such that a tile area defined by connecting three adjacent sensor nodes among the plurality of sensor nodes has an equilateral triangle shape, and the at least one extra sensor node is deployed at a center of the tile area, a radius of the sensing area of the at least one extra sensor node is r=R/√{square root over (31)}≈0.1796R when the sensing area of the plurality of sensor nodes is R, a length of one side of the tile area is a=2(R−x)=6R√{square root over (3)}/√{square root over (31)}≈1.8665R, and a length of a portion of one side of the tile area in which the sensing areas of the plurality of sensor nodes is 2x=2R(√{square root over (31)}−3√{square root over (3)})/√{square root over (31)}≈0.1335R.