Spread spectrum baseband modulation of magnetic fields for communications and proximity sensing
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United States of America Patent
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May 21, 2002
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app pub date -
Sep 24, 1998
filing date -
Sep 26, 1997
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Abstract
A magnetic field-based tagged object information storage and retrieval system employs a spread spectrum modulated magnetic field for identifying each of a plurality of tagged objects to which spread spectrum modulation magnetic field transponders are attached. When interrogated by a tag reader, transponders embedded in plural tags generate spread spectrum modulated magnetic fields that are correlated with a reference spreading sequence in a tag reader signal processor to both detect and identify each responding tag.
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