Method and apparatus combining a tracking system and a wireless communication system
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United States of America Patent
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Nov 2, 2004
Issued Date -
N/A
app pub date -
Mar 2, 2000
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. The recursive-least squares (RLS) technique is used in filtering received signals. 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. A combined infrastructure including a wireless communication system and the local positioning system is also disclosed.
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