WO1995000936A1 - Balise d'identification - Google Patents

Balise d'identification Download PDF

Info

Publication number
WO1995000936A1
WO1995000936A1 PCT/GB1994/001360 GB9401360W WO9500936A1 WO 1995000936 A1 WO1995000936 A1 WO 1995000936A1 GB 9401360 W GB9401360 W GB 9401360W WO 9500936 A1 WO9500936 A1 WO 9500936A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
beacon
identification
signals
operator
Prior art date
Application number
PCT/GB1994/001360
Other languages
English (en)
Other versions
WO1995000936B1 (fr
Inventor
Klaus Norbert Tusch
Philip Wilmott
Original Assignee
Colebrand Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GB939312990A external-priority patent/GB9312990D0/en
Priority claimed from GB939318420A external-priority patent/GB9318420D0/en
Application filed by Colebrand Limited filed Critical Colebrand Limited
Priority to AU69787/94A priority Critical patent/AU6978794A/en
Publication of WO1995000936A1 publication Critical patent/WO1995000936A1/fr
Publication of WO1995000936B1 publication Critical patent/WO1995000936B1/fr

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B26/00—Alarm systems in which substations are interrogated in succession by a central station
    • G08B26/007—Wireless interrogation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication

Definitions

  • a controller may wish to be able to locate and control his operators without danger of interference from or giving information to unauthorised persons.
  • the invention provides an identification beacon as set out in claim 1.
  • the components are receiving means and transmitting means.
  • the receiving means receives a signal from the controller
  • the transmitting means is arranged to send back an interrogation signal to check that the security has not been breached.
  • the transmitting means is arranged to transmit the identification signal.
  • the received signals may include a control signal to control the identification signal transmitted.
  • the identification signal may be a coded signal, whose code is unique to that operator.
  • the controller can use a homing device to locate the source of that coded signal or the identification signal may be a location signal whose content gives the location of the operator; the operator may use the Global Positioning System in which reference to satellites enables his position on the ground to be given with great accuracy.
  • the beacon may be provided with means to control the transmission of the identification signal, so that in spite of a satisfactory reply to the interrogation signal, it is inhibited from transmitting an identification signal. This might be necessary if the operator has encountered a dangerous situation.
  • the beacon may simply act as a pager to indicate to the operator that he has been "called" - the indication being that of a pager - a visible, audible or other sensory signal, such as vibration. The operator can then cause transmission of the identification signal when the dangerous situation is over.
  • the control signal may control the nature of the interrogation signal and of the criteria for a satisfactory reply to be used at the next interchange of signals or after a certain number of such interchanges.
  • any one or more of the receiving channel of the beacon, the interrogation signal and the criteria for satisfactory response may be changed automatically after a predetermined number (which may be one) of signal interchanges with the controller.
  • the beacon may have a sequence of modes; after a first interchange of signals with a satisfactory reply being received at the receiver, the receiving means and transmitting means may be changed to a second mode in which the receiving means only responds to a control signal of a different format and/or changes the parameters of a reply which is satisfactory and/or in which the interrogation signal is changed.
  • the control and interrogation signals are most suitably at radio frequencies, for example in the UHF band around 400 MHz.
  • Broadcast transmission as distinct from use of highly directional lasers, is convenient when the relative location of the recipient is not known at the time of transmission.
  • directional systems such as microwave links are preferred when relative locations are known.
  • Satellite communications are suitable, particularly for the transmissions from the beacon.
  • the identifying signal can be in the infrared region so that it is only detected by infrared sensitive devices, and it could be coded for greater security.
  • the parameters of the identification signal which may be changed by control signals include its amplitude. As the distance between the beacon and the controller increases, it is desirable to increase the amplitude of the identification signal for satisfactory reception by the controller. Another parameter which can be changed is the signal content, the change becoming necessary when two beacons with identification signals of similar content approach each other and might be confused.
  • control signals to effect this change at the instance of the controller is one possible method, it is possible for the beacon to be provided with a sensor for sensing identification signals transmitted by other beacons in the vicinity. If an identification signal with the same or a similar code is sensed, the beacon can respond to such sensing by either inhibiting its own transmission of identification signals, or transmitting its own identification signal a predetermined time delay after receiving the similar signal.
  • Suitable identification signals may include digital codes, and the similarity of the signals can be judged when predetermined digits of the codes are the same.
  • FIG. 1 is a diagrammatic block diagram of a beacon in relation to a controller.
  • a controller C and a beacon B interchange signals X, Y and Z.
  • the beacon has a receiver R to receive signals X and Z and a transmitter to send signal Y and an identification signal I.
  • the controller wishes to call up the beacon, he sends a signal X in a prearranged channel and of a prearranged format. He would use an aerial with a wide field of transmission if the location of the beacon is unknown to him at the time of transmission.
  • the receiver R of the beacon receives the signal X and assuming it is of an acceptable format, determined by reference to criteria of acceptability in the beacon, the beacon transmitter T sends back to the controller an interrogation signal Y. On receipt of the interrogation signal, the controller sends back to the beacon a prearranged response to the interrogation signal Y, in the form of a security clearance signal Z. Provided that the signal Z received by the beacon receiver meets prearranged criteria, the beacon then operates.
  • the operation of the beacon may be to transmit an identification signal I for a predetermined period from which the controller can take a fix in order to determine the position of the beacon accurately.
  • a more sophisticated beacon may be in radio communication with satellites to obtain from them an accurate fix of its own position on the ground and the coordinates of that position can be transmitted in the identification signal back to the controller. This arrangement enables the transmission back to the controller to be of a shorter period and thus less susceptible to interference from or discovery by third parties.
  • One of the signals X and Z may contain a control signal which, after the receipt of the satisfactory signal Z, will cause the beacon to perform other duties. These duties include changing the nature of the identification signal to be transmitted, changing the channel or format of the signals from the controller to which it is responsive, and in particular changing a security code within one of the signals X and Z so that for each interchange of signals or after a predetermined number of interchanges of signals the code advances along a predetermined sequence, known to both the controller and the beacon and stored in their software.
  • the control signals may also control the nature of the interrogation signal Y.
  • the changes caused by the control signals are partly to change the nature of the identification signal to be transmitted by the beacon for operational convenience, and partly to change the security checking system between the controller and the beacon, to avoid interference by unauthorised third parties.
  • a situation may occur when the operator of the beacon does not wish the identification signal to be transmitted when it is called up by the controller.
  • the beacon is for this purpose provided with an override switch 0 which diverts the signal which would normally cause transmission of the identification signal to a paging device P, which would simply notify in a private manner to the operator of the beacon that the controller wishes to receive an identification signal.
  • This paging device may indicate to the operator by means of light, sound or vibration, for example.
  • the beacon has a sensor S which detects identification signals from other such beacons.
  • the sensor compares the received signals with the identification signal it is presently programmed to transmit. If it is sufficiently similar, the transmitter T is caused to transmit an identification signal in timed relation to the received identification signal from other beacons. Alternatively transmission of its own identification signals can be inhibited.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Une balise d'identification (B) pemet d'envoyer un signal d'identification (I) en réponse à un signal d'appel (X), mais de préférence seulement si ce dernier signal provient d'une source approuvée (C), et seulement quand l'utilisateur de cette balise peut émettre le signal d'identification en toute sécurité. Cette balise est ainsi dotée d'un récepteur (R) et d'un émetteur (T). Le récepteur répond à un signal d'appel présentant des paramètres appropriés en faisant envoyer par l'émetteur un signal d'interrogation (Y) à l'appelant. Si le récepteur reçoit alors de ce dernier une réponse satisfaisante (Z) à son signal d'interrogation, il fait envoyer par l'émetteur un signal d'identification (I). Une touche facultative de priorité (O) permet à l'utilisateur d'empêcher l'émission du signal d'identification dans certaines circonstances, et il peut exister un dispositif (P) de recherche de personnes (P) qui prévient l'utilisateur que la balise est prête à émettre un signal d'identification en réponse à un signal d'appel, mais que cet utilisateur l'en empêche à un moment donné. Les signaux reçus peuvent inclure des signaux de commande destinés à modifier la nature des signaux à émettre ou les critères d'acceptabilité des signaux reçus. Si l'on préfère, ces changements peuvent intervenir automatiquement en réponse à un certain nombre qui inclut l'un des échanges de signaux avec une unité de commande.
PCT/GB1994/001360 1993-06-23 1994-06-23 Balise d'identification WO1995000936A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU69787/94A AU6978794A (en) 1993-06-23 1994-06-23 Identification beacon

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB939312990A GB9312990D0 (en) 1993-06-23 1993-06-23 Identification device
GB9312990.6 1993-06-23
GB9318420.8 1993-09-06
GB939318420A GB9318420D0 (en) 1993-09-06 1993-09-06 Identification device

Publications (2)

Publication Number Publication Date
WO1995000936A1 true WO1995000936A1 (fr) 1995-01-05
WO1995000936B1 WO1995000936B1 (fr) 1995-02-02

Family

ID=26303116

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/001360 WO1995000936A1 (fr) 1993-06-23 1994-06-23 Balise d'identification

Country Status (2)

Country Link
AU (1) AU6978794A (fr)
WO (1) WO1995000936A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2741159A1 (fr) * 1995-11-14 1997-05-16 Centre Nat Etd Spatiales Systeme mondial de radiolocalisation et de radionavigation spatiale, balise, et recepteur mis en oeuvre dans un tel systeme

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2071464A (en) * 1980-03-08 1981-09-16 Gott G F Doany P Communication Systems
EP0167442A2 (fr) * 1984-06-29 1986-01-08 Fairchild Weston Systems Inc. Système de communication à sécurité
US5077791A (en) * 1989-06-26 1991-12-31 Motorola, Inc. Method and apparatus for preventing unauthorized transmissions
EP0509776A2 (fr) * 1991-04-19 1992-10-21 Pioneer Electronic Corporation Système de surveillance et de commande à distance pour corps mobiles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2071464A (en) * 1980-03-08 1981-09-16 Gott G F Doany P Communication Systems
EP0167442A2 (fr) * 1984-06-29 1986-01-08 Fairchild Weston Systems Inc. Système de communication à sécurité
US5077791A (en) * 1989-06-26 1991-12-31 Motorola, Inc. Method and apparatus for preventing unauthorized transmissions
EP0509776A2 (fr) * 1991-04-19 1992-10-21 Pioneer Electronic Corporation Système de surveillance et de commande à distance pour corps mobiles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2741159A1 (fr) * 1995-11-14 1997-05-16 Centre Nat Etd Spatiales Systeme mondial de radiolocalisation et de radionavigation spatiale, balise, et recepteur mis en oeuvre dans un tel systeme
WO1997018485A1 (fr) * 1995-11-14 1997-05-22 Centre National D'etudes Spatiales Systeme mondial de radiolocalisation et de radionavigation spatiales, balise, et recepteur mis en oeuvre dans un tel systeme

Also Published As

Publication number Publication date
AU6978794A (en) 1995-01-17

Similar Documents

Publication Publication Date Title
US5223816A (en) Security and communication system with location detection
US5001488A (en) Battlefield IFF method and system for its application
US5898391A (en) Vehicle tracking system
US4833477A (en) Emergency vessel location system
US5675925A (en) System for rendering a hand weapon inoperable
EP0522040B1 (fr) Systeme de localisation
US6236836B1 (en) Transponder system for localization of an object
US5485163A (en) Personal locator system
US20030201889A1 (en) Remote security condition detection and notifcation system
US7536169B2 (en) Method of and apparatus for utilizing geographically spread cellular radio networks to supplement more geographically limited stolen vehicle recovery radio networks in activation of radio tracking and recovery of such vehicles
EP0836288A3 (fr) Procédé et système à spectre étalé pour la communication entre un station de base et plusieurs stations mobiles
EP1593564A1 (fr) Procédé et système de communication entre des véhicules
EP0306577B1 (fr) Système et procédé de détermination de la position d'une personne ou d'un autre corps
US7215241B2 (en) Tamper detection sensor antenna
RU2349472C1 (ru) Спутниковая охранно-поисковая система
US4134108A (en) Emergency alarm device
EP1163535B1 (fr) Systeme d'alarme pour objets mobiles
WO1995000936A1 (fr) Balise d'identification
GB2271692A (en) Vehicle location system
US5223837A (en) Anti-exploitation method and apparatus for controlling aircraft IFF
WO1997017623A1 (fr) Systeme a niveaux multiples de poursuite de vehicule
JP2901586B1 (ja) 特定区域通報装置
CA2298293A1 (fr) Systeme de reperage a deux voies utilisant un reseau sans fils actuel
EP1456825B1 (fr) Unite de localisation
WO1999034632A1 (fr) Procede et systeme de localisation d'un emetteur de signaux

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AT AU BB BG BR BY CA CH CN CZ DE DK ES FI GB GE HU JP KP KR KZ LK LU LV MG MN MW NL NO NZ PL PT RO RU SD SE SK UA US UZ VN

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA