Tag tracking
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United States of America Patent
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Issued Date -
Jun 16, 2005
app pub date -
Nov 10, 2004
filing date -
Dec 3, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A tracking system is described in which a mobile tag having an unknown position is tracked in space over time. The mobile tag transmits a signal comprising a sequence of frequency components at different frequencies. The transmitted signal is received at each of a plurality of receivers, each having a known location. Each of the receivers measures the phase of each of the tones and the phase measures are passed to a central processing unit. The central processing unit then uses the determined phase measures to determine the position of the tag at the time of the transmission. Various novel tag arrangements are described which generate new transmission signals which improve accuracy and reliability of the position measurements obtained.
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