Patent ID: 7728724

Claim:
A positioning and tracking system, comprising: a monitoring station to receive a location request and a second identification code from a user and transmitting a signal that includes the second identification code; a tracking device, the tracking device comprising: a signal receiver to receive a signal from the monitoring station comprising: the second identification code, a microprocessor/logic circuit to store a first identification code to produce a stored identification code, calculate location data for the tracking device, and generate a position signal; a global positioning system logic circuit; and a signal transmitter; a first transmitter/receiver station and a second transmitter/receiver station to communicate with each other and the tracking device to determine location of the tracking device without a requirement of line-of-sight between a global positioning system and the tracked device; wherein a latitude and a longitude of the tracking device results from a comparison of measurements from gps satellites to the tracking device, measurements of distances between two or more gps satellites, and measurements of relative orientations of the two or more gps satellites, the tracking device, and earth; and wherein the tracking device compares the second identification code to the stored identification code and upon determining that the second identification code matches the stored identification code, the signal transmitter transmits the position signal to the monitoring station.