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Electronic tracking and ranging system

  • US 7,389,180 B2
  • Filed: 02/06/2004
  • Issued: 06/17/2008
  • Est. Priority Date: 02/06/2004
  • Status: Expired due to Fees
First Claim
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1. 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.

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