Patent ID: 7855684
Filing Date: 2010-12-21
Classification: G01S

Abstract:
1. A position locating system for a sensor network, comprising: a plurality of reference nodes, each reference node of said plurality of reference nodes having self-positional information regarding a respective position thereof; and a sensor node having a position location table, wherein each reference node comprises: wherein the sensor node comprises: an RF communication unit for transmitting the coordinate request signal, and for receiving location information and forwarding the location information to the control unit, wherein the position location table is formed by providing a grid of a preset number of vertical and horizontal lines corresponding to a square area defined by an arrangement of the plurality of reference nodes; wherein measured distances from each intersection point in the grid to each of the reference nodes, respectively correspond to transmit power levels; wherein intersection points sorted according to transmit power level patterns are arranged into sorted groups in which each particular group has a middle point of those intersection points belonging to the particular group; and error calculating means for calculating errors for all groups to determine whether a largest group error is within a desired error boundary.