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Vehicle in-lane positional indication/control by phase detection of RF signals induced in completely-passive resonant-loop circuits buried along a road lane

  • US 5,708,427 A
  • Filed: 04/18/1996
  • Issued: 01/13/1998
  • Est. Priority Date: 04/18/1996
  • Status: Expired due to Fees
First Claim
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1. A method of determining a vehicle'"'"'s position on road lane comprising:

  • positioning a multiplicity of passive resonant circuits along a road lane;

    inductively coupling a first electromagnetic field from a first loop means in the vehicle as the vehicle proceeds along the road lane so that electromagnetic energy is inductively coupled from this first loop means into one or more of the multiplicity of resonant circuits as are then proximate to the vehicle, causing these one or more resonant circuits to themselves produce another, second, electromagnetic field; and

    detecting, in another, second, loop means in the vehicle as the vehicle proceeds along the road lane, a phase and a polarity of the second electromagnetic field relative to a phase and a polarity of the first electromagnetic field as an indication of the vehicle'"'"'s position upon the road land relative to those one or more of the multiplicity of resonant circuits into which energy was inductively coupled.

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