Near field electromagnetic calibration system
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United States of America Patent
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Dec 28, 2010
Grant Date -
Apr 29, 2010
app pub date -
Sep 21, 2009
filing date -
Aug 19, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A calibration system for a position determination system, the calibration system includes, in one embodiment, a calibration transmitter producing a calibration signal, a plurality of calibration receivers for receiving the calibration signal, each of the calibration receivers of the plurality of calibration receivers having a respective known calibration receiver position, and each of the calibration receivers of the plurality of calibration receivers including means for receiving a first signal characteristic of said calibration signal, means for receiving a second signal characteristic of said calibration signal, and a comparison unit for comparing said first signal characteristic and said second signal characteristic of said calibration signal to generate a calibration comparison result. In various embodiments, signal comparisons may be differences between electric and magnetic field phase or may utilize signal amplitude differences. A system utilizing a receiver and multiple transmitter locations is disclosed. Position may be determined using existing wiring.
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