Title:
IMPROVEMENTS IN OR RELATING TO NETWORKED COMMUNICATION DEVICES
Document Type and Number:
WIPO Patent Application WO2004008261
Kind Code:
A3
Abstract:
An aircraft emergency lighting system comprises a plurality of light units (501) arranged to guide passengers to and to identify exits (513, 514, 515, 516) in an emergency. The light units (501) communicate wirelessly with a remote master control unit (502) operable from the cockpit (511) using a low power spread spectrum signal centred on a single frequency to avoid interference with onboard aircraft control and communication systems. The light units (501) are arranged to receive and transmit any signal to and from the master controller (502) whereby only some of the light units (501) need be within range of the master controller (502). The light units (501) comprise battery operated LEDs and cycle between an inoperable (sleep) condition and an operable (awake) condition to conserve power consumption and extend battery life.
Inventors:
STOKES PETER DAVID (GB)
LEACH DANIEL (GB)
BRAITHWAITE STEPHEN JOHN (GB)
LEACH DANIEL (GB)
BRAITHWAITE STEPHEN JOHN (GB)
Application Number:
PCT/GB2003/003006
Publication Date:
April 08, 2004
Filing Date:
July 10, 2003
Export Citation:
Assignee:
STG AEROSPACE LTD (GB)
STOKES PETER DAVID (GB)
LEACH DANIEL (GB)
BRAITHWAITE STEPHEN JOHN (GB)
STOKES PETER DAVID (GB)
LEACH DANIEL (GB)
BRAITHWAITE STEPHEN JOHN (GB)
International Classes:
G05B15/02; (IPC1-7): G05B19/042; H04B7/00; G05B15/02; H02J9/00
Foreign References:
| US20010055965A1 | 2001-12-27 | |||
| US20020044042A1 | 2002-04-18 | |||
| US5907491A | 1999-05-25 | |||
| US20020080027A1 | 2002-06-27 | |||
| DE4134034A1 | 1992-07-16 |
Other References:
HARMAN R M: "Wireless solutions for aircraft condition based maintenance systems", 2002 IEEE AEROSPACE CONFERENCE PROCEEDINGS, vol. 6, 9 March 2002 (2002-03-09) - 16 March 2002 (2002-03-16), Big Sky, MT, USA, pages 2877 - 2886, XP010604856
ALENA R ET AL: "Modeling a wireless network for international space station", IEEE AEROSPACE CONFERENCE PROCEEDINGS 2000, vol. 11, 18 March 2000 (2000-03-18) - 25 March 2000 (2000-03-25), pages 223 - 228, XP010518477
J. HAARTSEN: "BLUETOOTH - The universal radio interface for ad hoc, wireless connectivity", ERICSSON REVIEW, no. 3, 1998, pages 110 - 117, XP000783249, Retrieved from the Internet [retrieved on 20031031]
ALENA R ET AL: "Modeling a wireless network for international space station", IEEE AEROSPACE CONFERENCE PROCEEDINGS 2000, vol. 11, 18 March 2000 (2000-03-18) - 25 March 2000 (2000-03-25), pages 223 - 228, XP010518477
J. HAARTSEN: "BLUETOOTH - The universal radio interface for ad hoc, wireless connectivity", ERICSSON REVIEW, no. 3, 1998, pages 110 - 117, XP000783249, Retrieved from the Internet
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