Method and system for detecting object presence and its duration in a given area
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United States of America Patent
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Jul 5, 2005
Grant Date -
N/A
app pub date -
May 15, 2001
filing date -
May 15, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system (10) for determining a presence, identity, and duration of presence in a given area of an object includes one or more mobile transmitters (12) that periodically send out a beacon signal. A node (14) includes a receiver (16) that receives a beacon signal whenever a mobile transmitter (12) is within a threshold range of the node (14). The node (14) includes a controller (18) that determines a signal strength of each received beacon signal. The controller (18) compares the signal strength of each received beacon signal to a reference signal strength associated with the threshold range in order to determine whether the mobile transmitter (12) was within the desired detection area of the node (14). A base unit (24) sorts received information packets for processing by a base computer (28) in order to determine what mobile transmitter (12) was at what node (14) and for how long.
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