Patent ID: 8134460

Claim:
A relative positioning system comprising: an adjoining pair of spaced apart receivers positioned proximal to an object causing a signal interference with a radio frequency signal detectable by each receiver of the adjoining pair, the radio frequency signal associated with an emitter; and control electronics operatively coupling the spaced apart receivers, the control electronics configured to determine a direction of the emitter based on the signal interference; wherein the emitter is an electronic tag attached to a separate object of interest; wherein the adjoining pair of receivers is provided by two of a plurality of spaced apart radio frequency receivers, each radio frequency receiver being able to receive the radio frequency signal from the electronic tag attached to the separate object of interest; wherein the control electronics is configured to produce a directional cue corresponding to the heading of the separate object of interest based on the strength of the radio frequency signal received by each of the plurality of receivers; and wherein the directional cue is determined by a trigger algorithm based on a differential degradation in the strength of the signal detected by the plurality of receivers, the differential degradation caused by the signal interference.