Article tracking system
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United States of America Patent
Stats
-
Nov 21, 2000
Grant Date -
N/A
app pub date -
Oct 17, 1997
filing date -
Oct 17, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
System for tracking mobile tags. Cell controllers with multiple antenna modules generate a carrier signal which is received by the tags. Tags shift the frequency of the carrier signal, modulate an identification code onto it, and transmit the resulting tag signal at randomized intervals. The antennas receive and process the response, and determine the presence of the tags by proximity and triangulation. Distance of a tag from an antenna is calculated by measuring the round trip signal time. The cell controllers send data from the antenna to a host computer. The host computer collects the data and resolves them into positional estimates. Data are archived in a data warehouse, such as an SQL Server.
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