Patent ID: 7432806
Filing Date: 2008-10-07
Classification: G01S,G08B

Abstract:
1. A tracker system comprising: (a) a reference signal generator responsive to and phase-stabilized by a broadcast signal; (b) a transmitter coupled to and phase-stabilized by the reference signal generator; (c) a receiver coupled to and phase-stabilized by the reference signal generator and responsive to a return signal from a transponder unit that is coupled via field radiation to the tracker system, which return signal is triggered by a signal from the transmitter; (d) a global positioning module to determine the location of the tracker system; and (e) a spatial position computer coupled to the receiver, the global positioning module and at least one of the reference signal generator and the transmitter, responsive to indicia of a phase relationship between an output signal from the transmitter and a return signal from the transponder and to the location of the tracker system determined by the global positioning module whereby the spatial position computer determines a spatial position of the transponder unit.