EP 1725992 A2 20061129 - A TIME-OF-FLIGHT MEASUREMENT SYSTEM AND A METHOD OF OPERATING THE SYSTEM
Title (en)
A TIME-OF-FLIGHT MEASUREMENT SYSTEM AND A METHOD OF OPERATING THE SYSTEM
Title (de)
FLUGZEITMESSSYSTEM UND VERFAHREN ZU SEINEM BETRIEB
Title (fr)
SYSTEME DE MESURE DU TEMPS DE VOL ET PROCEDE D'UTILISATION DE CE SYSTEME
Publication
Application
Priority
- IB 2005050696 W 20050225
- GB 0404857 A 20040304
Abstract (en)
[origin: WO2005088561A2] A time-of-flight ranging system, such as a keyless entry system, comprises a first part (10) and a second part (12) which may implemented as a portable device such as a key fob. Both parts have signal transmitting and receiving means (14, 22 and 26, 32) for effecting communication with each other. The signal transmitting and receiving means introduce non-predictable time delays in their respective internal signal propagation paths. The first part includes a controller (18) for determining the time-of-flight of the signals io between the parts. In order to allow for the non-predictable time delays, the first and second parts are located within a known distance of each other and the time-of flight over the known distance is measured, the time difference between the measured time-of-flight and a theoretical time-of-flight over the known distance is determined and is used to adjust the measured time-of-flight is and thereby the range. The time-of-flight ranging system may be applied to not only entry security systems but also to tracking systems such as systems for tracking toddlers, personnel and equipment.
IPC 8 full level
G07C 9/00 (2006.01); B60R 25/24 (2013.01); H04W 24/00 (2009.01); H04W 84/10 (2009.01)
CPC (source: EP)
B60R 25/24 (2013.01); G07C 9/00309 (2013.01); G07C 2009/00341 (2013.01); G07C 2009/00555 (2013.01); G07C 2009/00777 (2013.01); G07C 2009/00793 (2013.01); G07C 2209/63 (2013.01)
Citation (search report)
See references of WO 2005088561A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2005088561 A2 20050922; WO 2005088561 A3 20060330; CN 1926584 A 20070307; EP 1725992 A2 20061129; GB 0404857 D0 20040407; JP 2007532369 A 20071115
DOCDB simple family (application)
IB 2005050696 W 20050225; CN 200580006635 A 20050225; EP 05708844 A 20050225; GB 0404857 A 20040304; JP 2007501413 A 20050225