EP0644519B1 - Agencement dans un système comportant des unités mobiles - Google Patents

Agencement dans un système comportant des unités mobiles Download PDF

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Publication number
EP0644519B1
EP0644519B1 EP19940850143 EP94850143A EP0644519B1 EP 0644519 B1 EP0644519 B1 EP 0644519B1 EP 19940850143 EP19940850143 EP 19940850143 EP 94850143 A EP94850143 A EP 94850143A EP 0644519 B1 EP0644519 B1 EP 0644519B1
Authority
EP
European Patent Office
Prior art keywords
beacon
virtual
mobile
arrangement according
unit
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
EP19940850143
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German (de)
English (en)
Other versions
EP0644519A3 (fr
EP0644519A2 (fr
Inventor
Erik Wichtel
Torbjörn Andersson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telia AB
Original Assignee
Telia AB
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Filing date
Publication date
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Publication of EP0644519A2 publication Critical patent/EP0644519A2/fr
Publication of EP0644519A3 publication Critical patent/EP0644519A3/fr
Application granted granted Critical
Publication of EP0644519B1 publication Critical patent/EP0644519B1/fr
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/123—Traffic control systems for road vehicles indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, trams
    • G08G1/127—Traffic control systems for road vehicles indicating the position of vehicles, e.g. scheduled vehicles; Managing passenger vehicles circulating according to a fixed timetable, e.g. buses, trains, trams to a central station ; Indicators in a central station

Definitions

  • the present invention relates to an arrangement for determining, in a system which includes, on the one hand, mobile units, for example a road transport information system (RTI), and, on the other hand, virtual beacons (radio beacons), the passage of a respective mobile unit past a respective beacon.
  • mobile units for example a road transport information system (RTI)
  • RTI road transport information system
  • virtual beacons radio beacons
  • the system consists of a portable locating unit which can be used both as mobile telephone and for global positioning.
  • the unit has a receiver for receiving signals from a global positioning system (GPS) and circuits for calculating the position.
  • GPS global positioning system
  • the position thus obtained is then transmitted via a mobile telephone system to the central unit.
  • the central unit there is a possibility for correlating the position obtained with a stored digital map for placing the user on the actual location on the map.
  • a unit in the vehicle calculates the position of the vehicle with the aid of a GPS system. This position is transmitted to a central monitoring station via a mobile telephone system if a break-in is detected or if a change of the position is detected.
  • a beacon is a location where short-range data transactions for RTI (Road Transport Informatics) can be carried out.
  • the range of a beacon is 10 - 500 metres depending on the technology used. Beacon systems are not continuous and do not operate with handover capability. The coverage is thus patchy by area without coverage in between.
  • the data structure in a beacon system is adapted to the discontinuous coverage.
  • the vehicle When passing a beacon, the vehicle obtains standard set-up data which describes the traffic level of the nearest surrounding area. The vehicle reports the traffic situation on the distance just travelled, which is then used by the beacon system for updating the traffic situation in its entirety. Individual transactions for a range of applications can also be carried out.
  • Detecting a beacon when passing it is done by external influences, for example carrier wave detection or at protocol level with, for example, End System Hello (ESH). After detection, data transactions can be carried out.
  • the position of the vehicle is determined auto-nomously in the vehicle (with dead reckoning). The quality of the position becomes progressively worse, which is why the position must be calibrated. In a real beacon system, calibration of the position of the vehicle is done when passing a beacon.
  • a beacon passage must be logically initiated internally in the vehicle. This is because no real beacon is physically passed in a virtual system. Moreover, the position must be determined with a non-autonomous system since automatic external calibration capabilities are lacking when real beacons cannot be passed (are not accessible in the environment).
  • the problem is to provide the vehicle with a valid position of sufficiently high quality and to determine when a virtual beacon can be passed (VBLS).
  • the present invention has the aim of solving the above problem.
  • a unit is arranged to extract a first position information produced by the system for a current virtual beacon, and that elements are arranged for determining if a passage exists or not in dependence on a comparison with a second position information relating to the position of the mobile and extracted from an external position determining system.
  • the external position determining system can consist of a system known per se, for example the global positioning system GPS, the differential global positioning system DGPX, the said systems in combination with dead reckoning, and so forth.
  • the unit (BLT) serves a part area of an area which is covered by the mobile system, and the mobile system thereby specifies positions produced or calculated for the virtual beacons in the part area.
  • the mobile system is arranged with a master unit which controls a number of part area units.
  • a respective part area unit (BLT) specifies in table form the positions of virtual beacons within the part area, and the relevant table is updated with a real or virtual beacon address.
  • the master unit is provided with or has stored all access telephone numbers and positions for virtual beacons in the system.
  • the said comparison-effecting elements are arranged for producing a difference signal with the said comparison and to indicate, with a predetermined value of the difference signal, whether a passage of an affected virtual beacon exists.
  • a certain predetermined position difference is allowed and all values of the signal under a predetermined value can indicate a passage.
  • the signal value difference can be arranged to be adjustable.
  • an appropriate indication of whether a passage of a virtual beacon exists for a current mobile unit or not is obtained.
  • Equipment known per se can be utilized for carrying out the ideas behind the invention.
  • similar processor and display units can be used in the mobile units or vehicles for both real and virtual beacon access.
  • real beacon access is developed and produced today by a number of enterprises.
  • the position obtained can be compared with positions stored centrally and/or in the vehicle for producing control nodes where the vehicle can take part in an information transfer.
  • the invention makes it possible to change the system by simple means due to the fact that virtual beacons can be moved, increased, shut down and so forth. Such a changeability is intended to occur preferably also during operation.
  • All beacon-based systems which operate in dual-mode operation with, for example, the mobile system GSN can be provided with VBLD when the system is used in GSN mode.
  • VBLD virtual beacon locations
  • the parameter AUP specifies an uncertainty parameter which can be related to the greatest position difference (spacing) between EPD and BLT which can be accepted as an indication when a virtual beacon is passed.
  • AUP is thus an adjustable parameter which, when the value drops below it, generates an event, a virtual beacon passage.
  • the event, a virtual beacon passage is a novelty in this connection. From the point of view of the vehicle application this is functionally identical with a real beacon passage.
  • a coverage area for a mobile system known per se is specified by 1.
  • the mobile system can consist of the RTI system mentioned in the introduction. This system is well known per se and will not be described in great detail here, apart from the connections between the system and the ideas of the present invention.
  • Coverage within the area 1 is discontinuous and the part areas within the area 1 which is covered are specified by 2, 3, 4 and 5.
  • a unit BLT (Beacon Location Table) belongs to each respective part area, for example part area 2. This BLT can be placed centrally within the area or in a respective mobile unit.
  • the BLT unit specifies the positions of virtual beacons of the system in the nearest surrounding area or in the part area, for example part area 2.
  • the BLT unit operates with a table which is updated on access of a real or virtual beacon.
  • NBLT central master BLT unit
  • All access telephone numbers and positions of virtual beacons are stored in this NBLT.
  • the virtual beacons of the systems can be moved or added to through changes in the NBLT, something which would be costly in a real beacon system.
  • the changes can also be carried out during operation.
  • the system changes come into force in the entire system with respective downloading to local BLTs.
  • an external position determining system EPD is utilized. This can be of a type known per se in accordance with the above.
  • the external position determining system EPD determines the positions of the mobile units.
  • the position of the said virtual beacon is specified in the system through the BLT unit, and the system can thus extract a first position information 11 which can be assigned to the position of a current virtual beacon.
  • the EPD system can extract a second position information I2 for the mobile unit M which passes the said virtual beacon.
  • a comparison function exists in the system, which comparison information can be entered in the BLT and/or NBLT unit(s).
  • the comparison function can be effected by a comparison element 6 of a type known per se.
  • the comparison results in a signal or parameter AUP. Since the position from the EPD system has a degree of uncertainty, a certain error must be accepted in the AUP parameter.
  • AUP stands for Area Uncertainty Parameter.
  • the AUP parameter specifies the greatest position difference or spacing between EPD and BLT which is accepted as an indication that a virtual beacon is being passed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Traffic Control Systems (AREA)

Claims (10)

  1. Dispositif pour déterminer, dans un système comprenant des unités mobiles (M), par exemple un système d'informations de transport routier (RTI), et des balises virtuelles (radiobalises VB), le passage d'une unité mobile respective devant une balise respective, caractérisé en ce que ledit dispositif comprend une unité (BLT) qui est agencée pour extraire une première information de position (Il) produite par le système pour une balise virtuelle en cours (VB), et en ce que ledit dispositif comprend des éléments effectuant une comparaison (6) qui sont agencés pour déterminer s'il y a un passage ou non en fonction d'une comparaison avec une deuxième information de position (I2) relative à la position du mobile et extraite d'un système de détermination de position extérieur (EPD).
  2. Dispositif selon la revendication 1, caractérisé en ce que le sytème de détermination de position extérieur (EPD) consiste en un système connu en lui-même, par exemple le système de positionnement global GPS, le système de positionnement global différentiel DGPS, lesdits systèmes en combinaison avec une détermination à l'estime, etc.
  3. Dispositif selon larevendication 1 ou 2, caractérisé en ce que l'unité (BLT) dessert une zone partielle (2,3,4 ou 5) qui est couverte par le système mobile et spécifie ainsi des positions, produites par le système mobile, pour les balises virtuelles (VB) dans une zone partielle respective, et en ce que le système mobile est prévu avec une unité centrale (NBLT) qui commande une pluralité d'unités de zone partielle (BLT).
  4. Dispositif selon la revendication 1,2 ou 3, caractérisé en ce qu'une unité de zone partielle respective (BLT) sous forme de table spécifie des balises virtuelles à l'intérieur de la zone partielle (2,3,4 ou 5) et en ce que la table concernée est mise à jour avec une adresse de balise réelle et/ou virtuelle.
  5. Dispositif selon la revendication 3, caractérisé en ce que l'unité centrale (NBLT) reçoit ou stocke des numéros de téléphone d'accès et des positions de balises virtuelles, de sorte qu'on obtient une possibilité de changement simple en ce que les balises virtuelles du système peuvent être déplacées, augmentées, arrêtées, etc., cette possibilité de changement étant prévue également pour avoir lieu de préférence pendant le fonctionnement du système, et en ce que lesdits changements peuvent être téléchargés dans une unité de zone partielle respective (BLT).
  6. Dispositif selon une quelconque des revendications précédentes, caractérisé en ce qu'un élément qui effectue une comparaison (6) est prévu pour produire un signal ou paramètre de différence (AUP) lors de la comparaison, et en ce qu'une valeur prédéterminée ou une grandeur prédéterminée du signal de différence indique si un passage existe ou non à la balise virtuelle concernée.
  7. Dispositif selon la revendication 6, caractérisé en ce qu'une certaine différence de position prédéterminée est également calculée et en ce que toutes les valeurs du signal ou du paramètre inférieures à la valeur prédéterminée ou à l'intérieur d'une plage de valeurs en cours indiquent un passage.
  8. Dispositif selon la revendication 6 ou 7, caractérisé en ce que la différence de valeur de signal ou de paramètre autorisée est prévue pour être réglable.
  9. Dispositif selon une quelconque des revendications précédentes, caractérisé en ce que, lorsqu'un passage d'une balise en cours a été établi, l'unité/ véhicule mobile obtient des données à partir du système, et en ce que l'unité mobile signale la situation de trafic sur la distance qui vient d'être parcourue jusqu'à la balise en cours, pour permettre au système de balises de mettre à jour la situation de trafic et,en plus de cela,une transaction individuelle ou des transactions individuelles pour une gamme d'applications peuvent être effectuées.
  10. Dispositif selon une quelconque des revendications précédentes, caractérisé en ce qu'on peut utiliser des unités de traitement et d'affichage connues en elles-mêmes, pour accès à la fois à des balises réelles et à des balises virtuelles.
EP19940850143 1993-09-14 1994-08-29 Agencement dans un système comportant des unités mobiles Expired - Lifetime EP0644519B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9302981 1993-09-14
SE9302981A SE9302981L (sv) 1993-09-14 1993-09-14 Anordning i system innefattande mobila enheter

Publications (3)

Publication Number Publication Date
EP0644519A2 EP0644519A2 (fr) 1995-03-22
EP0644519A3 EP0644519A3 (fr) 1996-06-26
EP0644519B1 true EP0644519B1 (fr) 1999-12-15

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EP19940850143 Expired - Lifetime EP0644519B1 (fr) 1993-09-14 1994-08-29 Agencement dans un système comportant des unités mobiles

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EP (1) EP0644519B1 (fr)
DE (1) DE69422112T2 (fr)
SE (1) SE9302981L (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19732371A1 (de) * 1997-06-06 1998-12-10 Volkswagen Ag Verfahren zur Disposition von Kraftfahrzeugen
CN102057294B (zh) * 2008-06-06 2014-03-26 上海贝尔股份有限公司 用于分布式天线系统中室内无线定位的设备和方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1277400C (fr) * 1986-04-09 1990-12-04 Uri Rapoport Systeme antivol et localisateur
US5155689A (en) * 1991-01-17 1992-10-13 By-Word Technologies, Inc. Vehicle locating and communicating method and apparatus
US5173710A (en) * 1991-08-15 1992-12-22 Terrapin Corporation Navigation and positioning system and method using uncoordinated beacon signals

Also Published As

Publication number Publication date
SE9302981D0 (sv) 1993-09-14
DE69422112T2 (de) 2000-05-31
EP0644519A3 (fr) 1996-06-26
SE9302981L (sv) 1995-03-15
EP0644519A2 (fr) 1995-03-22
DE69422112D1 (de) 2000-01-20

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