Radio system
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United States of America Patent
Stats
-
May 29, 2007
Grant Date -
Feb 28, 2002
app pub date -
Aug 30, 2001
filing date -
Aug 30, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A stationary device 20 sends a portable-device finding signal to a portable device 10 from a plurality of stationary-device side antennae 24 and 25, which are located at different positions. Upon receipt of the portable-device finding signal from the stationary device 20, the portable device 10 sends a reception intensity data signal to the stationary device 20. The stationary device 20 determines the current position of the portable device 10 by using reception intensity data of the portable-device finding signals, which are received at the stationary-device side antennae, from the portable device 10.
First Claim
Family
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Cited Art Landscape
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