Tag tracking
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United States of America Patent
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Jun 5, 2007
Grant Date -
Mar 18, 2004
app pub date -
Nov 14, 2001
filing date -
Nov 15, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides a tracking system in which a mobile tag having an unknown position, which tag is to be tracked in space over time, transmits a signal comprising a pair of tones at different frequencies. The transmitted signal is received at each of three receivers, each having a known location, where the phase of each of the tones within the signal is measured. The measured phases are passed to a processing unit which determines the position of the tag at the time of transmission of the signal on the basis of the difference between the measured phases of the two tones. The tracking system operates over a defined finite range to track the position of the mobile tag uniquely in space.
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