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1. (WO2001022377) RANDOMIZATION OF TRANSMIT TIME
Latest bibliographic data on file with the International Bureau   

Pub. No.: WO/2001/022377 International Application No.: PCT/US2000/023000
Publication Date: 29.03.2001 International Filing Date: 22.08.2000
Chapter 2 Demand Filed: 03.04.2001
IPC:
G08B 13/14 (2006.01) ,G08B 13/24 (2006.01) ,G08B 25/10 (2006.01)
G PHYSICS
08
SIGNALLING
B
SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
13
Burglar, theft, or intruder alarms
02
Mechanical actuation
14
by lifting or attempted removal of hand-portable articles
G PHYSICS
08
SIGNALLING
B
SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
13
Burglar, theft, or intruder alarms
22
Electrical actuation
24
by interference with electromagnetic field distribution
G PHYSICS
08
SIGNALLING
B
SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
25
Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
01
characterised by the transmission medium
10
using wireless transmission systems
Applicants:
NORTHROP GRUMMAN CORPORATION [US/US]; 1840 Century Park East Los Angeles, CA 90067-2199, US
Inventors:
RICHARDSON, David, Livingstone; US
ELEK, Gabor; US
Agent:
ANDERSON, Terry, J.; Northrop Grumman Corporation 1840 Century Park East Los Angeles, CA 90067-2199 , US
Priority Data:
09/401,24823.09.1999US
Title (EN) RANDOMIZATION OF TRANSMIT TIME
(FR) RANDOMISATION DU TEMPS D'EMISSION
Abstract:
(EN) The present invention discloses an apparatus for randomizing the transmit time in a tag RFID communication system. The CRC calculation is implemented through the use of software stored in the system microprocessor (10) and the calculations vary upon a plurality of dynamic inputs including temperature and motion of the tag (4). The tag apparatus of the present invention includes temperature (16) and motion monitors (14) for monitoring the environmental conditions of the tag (4). A microprocessor (10) in communication with the sensor calculates the next pseudo-random transmission based upon the dynamic inputs. A transmitter (12) transmits a signal to the system monitor.
(FR) La présente invention concerne un appareil qui permet de randomiser le temps d'émission dans un système de communication pour l'identification par radiofréquence d'étiquettes. Le calcul CRC est mis en oeuvre au moyen d'un logiciel stocké dans le microprocesseur du système et les calculs varient en fonction d'une pluralité d'entrées dynamiques telles que la température et le déplacement de l'étiquette (4). L'appareil associé à l'étiquette selon la présente invention comprend des capteurs de température (16) et de déplacement (14) qui surveillent les conditions ambiantes extérieures de l'étiquette (4). Un microprocesseur (10) relié aux capteurs calcule l'émission pseudo-aléatoire suivante sur la base des entrées dynamiques. Un émetteur (12) envoie ensuite un signal au système de surveillance.
Designated States: JP
European Patent Office (EPO) (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)