Patent ID: 8111152

Claim:
A relative positioning system comprising: an article wearable by an operator; at least two radio signal receivers positioned on the article spaced apart around the operator wearing the article such that the operator causes signal interference with a radio frequency signal detectable by each receiver, the radio frequency signal being associated with an emitter; control electronics on the article operatively coupling the spaced apart receivers and configured to determine a direction of the emitter relative to the operator based on the signal interference relative to the human body; and a plurality of stimulus generators supported by the article operatively connected to the control electronics and to the operator wearing the article, each stimulus generator able to generate a stimulus perceptible to the operator wearing the article; and at least a third radio signal receiver positioned on the article spaced apart around the operator from the at least two receivers wherein the spaced apart receivers define a two-dimensional, coordinate system centered on the operator wearing the article, the coordinate system including a plurality of sectors, each sector defined by an adjoining pair of spaced apart receivers, a separate stimulus generator being positioned in each sector; and the control electronics activating one of the plurality of stimulus generators so as to provide a direction cue to the operator as to the direction of the emitter relative to the operator and the control electronics causing the one stimulus generator to communicate the directional cue to the operator by executing a trigger algorithm based on a sum of the strength of the signal received by each receiver of the adjoining pair of spaced apart receivers defining the sector in which the signal emanates.