シグナリングシステム及び該システム用のトランスポンダ

Japanese Patent JP4107966

B2

A signalling system includes a plurality of active transponders ( 10 ), an interrogation station ( 12 ) and a source ( 14 ) of switching signals. Each of the transponders has a microcontroller ( 20 ), a radio transceiver ( 34 ) for responding to radio interrogation signals from the interrogation station, the radio transceiver being coupled to the controller by way of switching means ( 36 ) which switches the transceiver on or off whilst leaving the microcontroller active, and a passive receiver ( 38 ) for receiving switching signals from the source of switching signals which signals are used by the microcontroller for switching-on or -off the transceiver. Transducers ( 26, 28, 30 ) may be coupled to the microcontroller for monitoring environmental features, such as ambient temperature and humidity, and data relating to the features is stored in a RAM ( 32 ) in readiness to be relayed to storage means ( 56 ) in the interrogation station ( 12 ) as and when required. Signals received by the passive receiver enable the radio transceiver to be de-activated in locations, such as in an aircraft, where spurious radiation from the transponder is not permitted and to be re-activated when removed from such a location.

Divy Alan Jay
Marsden Ian Aye

JP2002563422A

June 25, 2008

January 31, 2002

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Koninklijke Philips Electronics N.V.

G06K17/00; G01D9/00; G06K19/07; H04B1/59; H04B5/02

JP7143043A
JP2001273056A
JP4319791A

US5790946
US5245346

Susumu Tsugaru
Akihiko Miyazaki

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