Patent ID: 7389180

Claim:
An electronic system for locating an object comprising: a monitor unit having a micro-controller, wherein the monitor unit transmits a monitor direct sequence spread spectrum (MDSSS) signal having a pseudo-random noise sequence, a monitor first frequency component and a monitor second frequency component; a tracked unit placed on the object and receiving the MDSSS signal from the monitor unit and transmits a tracked direct sequence spread spectrum (TDSSS) signal having a pseudo-random noise sequence, a first frequency component and a second frequency component to the monitor unit; and wherein the micro-controller compares the first frequency component of the TDSSS signal to the monitor first frequency component of the MDSSS signal creating a first phase difference utilized for a coarse accuracy determination of the distance relative between the monitor unit and the tracked unit, further wherein the micro-controller compares the second frequency component of the TDSSS signal to the monitor second frequency component of the MDSSS signal to create a second phase difference utilized for a medium accuracy determination of range between the tracked unit on the object and the monitor unit.