Enhanced wireless node location using differential signal strength metric
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United States of America Patent
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Jun 21, 2011
Grant Date -
Jan 3, 2008
app pub date -
Sep 12, 2007
filing date -
Sep 10, 2004
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Abstract
A wireless node location mechanism that employs a differential signal strength metric to reduce the errors caused by variations in wireless node transmit power, errors in signal strength detection, and/or direction-dependent path loss. As opposed to using the absolute signal strength or power of an RF signal transmitted by a wireless node, implementations of the location mechanism compare the differences between signal strength values detected at various pairs of radio receivers to corresponding differences characterized in a model of the RF environment. One implementation searches for the locations in the model between each pair of radio receivers where their signal strength is different by an observed amount.
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