EP0199266A1 - Système de radio mobile - Google Patents
Système de radio mobile Download PDFInfo
- Publication number
- EP0199266A1 EP0199266A1 EP86105205A EP86105205A EP0199266A1 EP 0199266 A1 EP0199266 A1 EP 0199266A1 EP 86105205 A EP86105205 A EP 86105205A EP 86105205 A EP86105205 A EP 86105205A EP 0199266 A1 EP0199266 A1 EP 0199266A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radio
- vehicle
- mobile radio
- vehicles
- location
- 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.)
- Granted
Links
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Classifications
-
- 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
- G08G1/133—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 within the vehicle ; Indicators inside the vehicles or at stops
Definitions
- the invention relates to a mobile radio system for establishing telephone connections to and from vehicles via radio links between on-board mobile radio devices and fixed radio concentrators, the geographical area covered by the system being subdivided into a plurality of partially overlapping radio cells and each radio cell being assigned a radio concentrator, and each having locating devices are provided in order to identify the radio cell corresponding to the vehicle location and to assign the mobile radio device to the radio concentrator corresponding to this radio cell.
- the system of radio cells in mobile radio systems serves to make the radio channels, which are only available to a limited extent, usable in many ways.
- the transmission power of the mobile radio devices in the vehicles and the radio concentrators is chosen so low that it can essentially only be received within a radio cell.
- the same channels can then be used at a certain spatial distance. If the total number of participants in the mobile radio system is to be increased without additional radio frequencies being available, the number of radio cells must be increased and the size thereof must be reduced, the transmission power also being reduced at the same time.
- a problem with mobile radio systems is the assignment of the vehicle positions to the relevant radio cells or the associated radio concentrators.
- vehicle location is carried out for this purpose by means of field strength measurement or by means of transit time measurement.
- Signals are exchanged between the radio concentrators and the vehicles in their range, and by determining the field strength or measuring the transit times, it is determined which radio concentrator is closest to the vehicle or has the best reception conditions.
- Such measurement methods are indeed usable as long as the radio cells have a relatively large extension, so that signal falsifications, for example distortion of transit times due to reflections from buildings and the like, are negligible.
- the requirements for radio location increase.
- the location accuracy is principally limited due to the already mentioned disturbed radio wave propagation, since tall buildings shield direct radio transmission.
- a radio contact only comes about through detours through numerous reflections, whereby these detours can amount to a few kilometers and can therefore be of the order of the radio cell diameter. If this happens, the location errors are no longer tolerable for the system.
- the object of the invention is to provide a mobile radio system of the type mentioned, in which the location of the vehicles and thus their assignment to certain radio cells and radio concentrators is made possible in a simple manner and with high accuracy, so that the reliability of the system is increased.
- this object is achieved in that a navigation device is provided in each of the vehicles, which receives data about its location as it passes stationary beacons and updates it while driving by means of a vehicle's own dead reckoning navigation device such that the location data determined in the navigation device corresponds to the The vehicle's mobile device is transmitted and evaluated by comparison with the location data of the individual radio cells to determine the associated radio cell or the associated radio concentrator.
- the invention thus works with a beacon-based dead reckoning system with which a very precise location determination of the vehicles can be carried out continuously while driving.
- the construction of such a location system alone as a supplement to the mobile radio system would be relatively complex.
- the costs for such a location in the mobile radio system become minimal if a navigation system of the right. described type is already present as part of a traffic control system for individual traffic, the infrastructure for the beacons being set up as part of the traffic control system and the individual vehicles being equipped with a navigation device.
- a route guidance system is described, for example, in EP-PS 00 21 060 and 00 25 193.
- the position data determined in the vehicle by the navigation device are simply transferred to the mobile radio device and transmitted from there to the radio concentrators which can be reached, the assignment to the radio cells in the radio concentrators being calculated.
- the data of the radio cells are stored in the mobile device of the vehicle according to their position and dimensions, so that the mobile devices can independently calculate which radio cell they are in by comparing the radio cell data with the position data of the vehicle. You can then switch to the corresponding radio channel and switch on or off at the respective radio concentrators. sign out.
- the radio cell data is stored depending on the shape of these radio cells, for example by storing the coordinates of the corner points of rectangles or by storing the center coordinates and the radii of circles.
- the respective beacons as well as the location coordinates for the passage of a vehicle also transmit the location coordinates for the radio cells of a certain surrounding area, so that they can each be supplied to the mobile radio device and stored therein.
- this information can also be used for the mobile radio system.
- the radio concentrators concerned can already be notified of a change to a neighboring radio cell. In this way, it is also possible to make a telephone call from the beginning in the overlap zones via the radio cell into which the vehicle is entering. In this way, the need to change channels during a call will only rarely exist, even with radio cells of small dimensions.
- FIG. 1 shows a schematic representation of the technical configuration of the combination of a mobile radio system with a navigation system according to the invention.
- a vehicle F contains a mobile radio device MB, which connects via an antenna AN in a known manner to a fixed radio concentrator FuKo, which is within the transmission range, and, if necessary, establishes a remote connection via this radio concentrator.
- the mobile radio device MB is connected to a navigation device N, which constantly determines its current location in the vehicle.
- the vehicle also contains a dead reckoning navigation device KON, which processes the measured values of a magnetic field probe MS and a wheel pulse generator RIG and transmits the path vector calculated therefrom to the navigation device.
- a dead reckoning navigation device KON processes the measured values of a magnetic field probe MS and a wheel pulse generator RIG and transmits the path vector calculated therefrom to the navigation device.
- beacons BK are distributed over the road network, preferably at important intersections, which, among other things, send precise location reports with their own position coordinates, so that every passing vehicle receives these coordinates and uses them to correct their navigation device N. can.
- the information transfer between the beacons BK and the vehicles F takes place, for. B. via infrared devices, in each beacon an infrared transmitter SB and an infrared receiver EB, in each vehicle an infrared transmitter SF and an infrared receiver EF are arranged.
- the infrared devices of the beacons can be arranged, for example, on signal masts SM of the crossroads in addition to the traffic signal transmitters VSG.
- the beacon BK is connected to a control center LZ via a line L and also receives control information from there. Since the beacon BK, like the navigation device N of the vehicle, is part of a route guidance or.
- Control systems for vehicles are, not only the mentioned location data, but also additional guidance information is exchanged between the respective beacon BK and the vehicle F passing through, for example a destination request of the vehicle entered in a destination memory ZSp of the vehicle from vehicle F to beacon BK or direction recommendations and other information from the beacon BK to the vehicle F.
- a destination request of the vehicle entered in a destination memory ZSp of the vehicle from vehicle F to beacon BK or direction recommendations and other information from the beacon BK to the vehicle F In addition to the already mentioned destination memory ZSp, an input keyboard TA and a direction indicator RA are provided in the control device B of the vehicle.
- this is not the subject of the present application, so that it will not be discussed further here.
- the current location calculated in the navigation device N of the vehicle is fed, preferably in the form of coordinates, to the mobile radio device MB and compared there in a comparison device VGL with radio cell data which are stored, for example, in a radio cell memory FSp.
- the mobile radio device determines in which radio cell the vehicle is located and with which radio concentrator a desired telephone connection is to be established accordingly.
- the data stored in the radio cell memory FSp for the different radio cells are also transmitted from the beacon BK to the vehicle when they pass a beacon BK and are transmitted to the mobile radio device MB for updating the memory FSp. It is sufficient if the data for the radio cells in the vicinity of the beacon are transmitted and stored.
- this or a guidance recommendation corresponding to the destination request and received by the beacon can also be communicated to the mobile radio device.
- the mobile radio device MB can already announce a change from one radio cell to another to the radio concentrator.
- FIG. 2 different radio cells Z1 to Zn are shown schematically, the size of z. B. the population density or traffic density is adjusted. They are described by their center coordinates (x ,; y,), ( X2 ; Y2 ) to (x n ; y " and their radii r ,, r 2 to r n .
- Each radio cell is assigned a radio concentrator, e.g.
- the beacon BK transmits these cell names and coordinates as well as their own coordinates - (x B ; y ⁇ ) to all passing vehicles, for example to the vehicle F1 in Fig. 2.
- the navigation device N (FIG. 1) continuously determines the position of the respective vehicle during the further journey and communicates this to the mobile radio device MB, which can determine by simple calculation in which radio cell the vehicle is located.
- the vehicle F2 moves in an overlap zone of the radio cells Z1 and Z3 towards the center of Z3. So it makes sense to start a conversation from the start on the radio cell Z3 and its radio concentrator FuKo, because then it is not necessary to switch to another channel as soon as possible.
- the radio concentrators can be arranged eccentrically in the radio cells, as shown in the radio cell Z2 using the example of the radio concentrator FuKo2. It is also possible to supply several radio cells from a single location, for example via rich antennas.
- the FuKo3-4-n radio concentrator is one such example.
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Navigation (AREA)
- Traffic Control Systems (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT86105205T ATE54398T1 (de) | 1985-04-17 | 1986-04-15 | Mobilfunksystem. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3513929 | 1985-04-17 | ||
DE3513929 | 1985-04-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0199266A1 true EP0199266A1 (fr) | 1986-10-29 |
EP0199266B1 EP0199266B1 (fr) | 1990-07-04 |
Family
ID=6268404
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86105205A Expired - Lifetime EP0199266B1 (fr) | 1985-04-17 | 1986-04-15 | Système de radio mobile |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0199266B1 (fr) |
AT (1) | ATE54398T1 (fr) |
DE (1) | DE3672376D1 (fr) |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0290725A2 (fr) * | 1987-05-15 | 1988-11-17 | Robert Bosch Gmbh | Procédé de localisation approximative d'une station radio mobile |
EP0292182A2 (fr) * | 1987-05-15 | 1988-11-23 | Securicor Datatrak Limited | Emetteur-récepteur mobile |
EP0333330A1 (fr) * | 1988-02-18 | 1989-09-20 | Gec-Marconi Limited | Système pour la distribution d'informations |
WO1989012835A1 (fr) * | 1988-06-17 | 1989-12-28 | Keith Chisholm Brown | Systeme de localisation de vehicules routiers |
DE3932029A1 (de) * | 1988-12-15 | 1990-06-28 | Sven Dipl Ing Haase | Anlage zur positionserkennung von fahrzeugen innerhalb eines ueberwachungsgebietes |
EP0451694A2 (fr) * | 1990-04-07 | 1991-10-16 | Alcatel SEL Aktiengesellschaft | Système de transmission à multiplex temporel |
EP0501058A2 (fr) * | 1991-01-17 | 1992-09-02 | Highwaymaster Communications, Inc. | Procédé et dispositif de communication et de localisation de véhicule |
EP0510169A1 (fr) * | 1990-11-08 | 1992-10-28 | Motorola, Inc. | Acces dynamique aux ressources de transmission en rf par des unites mobiles errantes |
EP0546758A2 (fr) * | 1991-12-09 | 1993-06-16 | Motorola, Inc. | Système de poursuite d'une unité mobile |
GB2271692A (en) * | 1992-10-13 | 1994-04-20 | Marconi Gec Ltd | Vehicle location system |
EP0615392A1 (fr) * | 1993-03-11 | 1994-09-14 | DETECON DEUTSCHE TELEPOST CONSULTING GmbH | Méthode et appareil pour le transfert d'appel dans un réseau radio mobile dépendant de la localisation |
EP0666007A4 (fr) * | 1991-09-20 | 1995-03-10 | Qualcomm Inc | Methode d'enregistrement pour dispositif de radiocommunications mobile. |
GB2283873A (en) * | 1993-11-08 | 1995-05-17 | Telia Ab | Railway communication and positioning system |
US5546445A (en) * | 1991-12-26 | 1996-08-13 | Dennison; Everett | Cellular telephone system that uses position of a mobile unit to make call management decisions |
US5588043A (en) * | 1991-09-20 | 1996-12-24 | Qualcomm Incorporated | Comprehensive mobile communications device registration method |
USRE35916E (en) * | 1991-12-26 | 1998-10-06 | Dennison; Everett | Cellular telephone system that uses position of a mobile unit to make call management decisions |
EP0984639A2 (fr) * | 1998-07-07 | 2000-03-08 | Nec Corporation | Méthode de communication pour véhicules et système pour ça |
US6061558A (en) * | 1992-01-27 | 2000-05-09 | Highwaymaster Communications, Inc. | Method and apparatus for a nation-wide cellular telephone network |
GB2353910A (en) * | 1999-09-03 | 2001-03-07 | Ibm | Asset tracking using local beacons |
CN1081563C (zh) * | 1999-07-09 | 2002-03-27 | 深圳市永华电子系统股份有限公司 | 机动车联网定位、报警、监控、收费方法及系统 |
EP1209930A2 (fr) * | 2000-11-21 | 2002-05-29 | DaimlerChrysler AG | Architecture de planification de communication basée sur des voies et procédé de communication sans fil |
US6847822B1 (en) | 1991-12-26 | 2005-01-25 | Sycord Limited Partnership | Cellular telephone system that uses position of a mobile unit to make call management decisions |
US20110191024A1 (en) * | 2010-01-29 | 2011-08-04 | Research In Motion Limited | Portable mobile transceiver for gps navigation and vehicle data input for dead reckoning mode |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6560461B1 (en) | 1997-08-04 | 2003-05-06 | Mundi Fomukong | Authorized location reporting paging system |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0021060A1 (fr) * | 1979-06-11 | 1981-01-07 | Siemens Aktiengesellschaft | Système de guidage pour la circulation individuelle |
US4475010A (en) * | 1983-05-05 | 1984-10-02 | At&T Bell Laboratories | High density cellular mobile radio communications |
DE3335128A1 (de) * | 1983-09-28 | 1985-04-11 | Siemens AG, 1000 Berlin und 8000 München | Mobiles funknetz |
-
1986
- 1986-04-15 EP EP86105205A patent/EP0199266B1/fr not_active Expired - Lifetime
- 1986-04-15 DE DE8686105205T patent/DE3672376D1/de not_active Expired - Fee Related
- 1986-04-15 AT AT86105205T patent/ATE54398T1/de not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0021060A1 (fr) * | 1979-06-11 | 1981-01-07 | Siemens Aktiengesellschaft | Système de guidage pour la circulation individuelle |
US4475010A (en) * | 1983-05-05 | 1984-10-02 | At&T Bell Laboratories | High density cellular mobile radio communications |
DE3335128A1 (de) * | 1983-09-28 | 1985-04-11 | Siemens AG, 1000 Berlin und 8000 München | Mobiles funknetz |
Non-Patent Citations (2)
Title |
---|
PATENTS ABSTRACTS OF JAPAN, Band 6, Nr. 254 (E-148)[1132], 14. Dezember 1982, Seite 15 E 148; & JP - A - 57 152 241 (FUJITSU TEN K.K.) 20-09-1982 * |
PATENTS ABSTRACTS OF JAPAN, Band 6, Nr. 259 (E-149)[1137], 17. Dezember 1982, Seite 1 E 149; & JP - A - 57 154 952 (MATSUSHITA DENKI SANGYO K.K.) 24-09-1982 * |
Cited By (51)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0292182A2 (fr) * | 1987-05-15 | 1988-11-23 | Securicor Datatrak Limited | Emetteur-récepteur mobile |
EP0290725A3 (en) * | 1987-05-15 | 1989-11-23 | Robert Bosch Gmbh | Method for approximately locating a mobile radio station |
EP0292182A3 (en) * | 1987-05-15 | 1990-02-07 | Datatrak Limited | Mobile transmitter/receiver |
EP0290725A2 (fr) * | 1987-05-15 | 1988-11-17 | Robert Bosch Gmbh | Procédé de localisation approximative d'une station radio mobile |
EP0333330A1 (fr) * | 1988-02-18 | 1989-09-20 | Gec-Marconi Limited | Système pour la distribution d'informations |
WO1989012835A1 (fr) * | 1988-06-17 | 1989-12-28 | Keith Chisholm Brown | Systeme de localisation de vehicules routiers |
DE3932029A1 (de) * | 1988-12-15 | 1990-06-28 | Sven Dipl Ing Haase | Anlage zur positionserkennung von fahrzeugen innerhalb eines ueberwachungsgebietes |
EP0451694A2 (fr) * | 1990-04-07 | 1991-10-16 | Alcatel SEL Aktiengesellschaft | Système de transmission à multiplex temporel |
EP0451694A3 (en) * | 1990-04-07 | 1992-07-08 | Standard Elektrik Lorenz Aktiengesellschaft | Time-multiplex transmission system |
EP0510169A4 (en) * | 1990-11-08 | 1993-08-04 | Motorola, Inc. | Dynamic rf communication resource access by roving mobile units |
EP0510169A1 (fr) * | 1990-11-08 | 1992-10-28 | Motorola, Inc. | Acces dynamique aux ressources de transmission en rf par des unites mobiles errantes |
EP0744727A3 (fr) * | 1991-01-17 | 1997-02-05 | Highwaymaster Comm Inc | Méthode et dispositif de communication pour véhicule |
US6148202A (en) * | 1991-01-17 | 2000-11-14 | @Track Communications, Inc. | Vehicle locating and communicating method and apparatus |
EP0501058A3 (en) * | 1991-01-17 | 1993-03-24 | By-Word Technologies Inc | Vehicle locating and communicating method and apparatus |
US5884221A (en) * | 1991-01-17 | 1999-03-16 | Highwaymaster Communications, Inc. | Vehicle locating and communicating method and apparatus |
US5299132A (en) * | 1991-01-17 | 1994-03-29 | By-Word Technologies, Inc. | Vehicle locating and communicating method and apparatus using cellular telephone network |
US5832394A (en) * | 1991-01-17 | 1998-11-03 | Highway Master Communications, Inc. | Vehicle locating and communicating method and apparatus |
US5652707A (en) * | 1991-01-17 | 1997-07-29 | Highwaymaster Communications, Inc. | Vehicle locating and communicating method and apparatus |
EP0501058A2 (fr) * | 1991-01-17 | 1992-09-02 | Highwaymaster Communications, Inc. | Procédé et dispositif de communication et de localisation de véhicule |
EP0744727A2 (fr) * | 1991-01-17 | 1996-11-27 | Highwaymaster Communications, Inc. | Méthode et dispositif de communication pour véhicule |
US5519621A (en) * | 1991-01-17 | 1996-05-21 | Highwaymaster Communications, Inc. | Vehicle locating and communicating method and apparatus |
US5621784A (en) * | 1991-09-20 | 1997-04-15 | Qualcomm Incorporated | Comprehensive mobile communications device registration method |
EP0666007A1 (fr) * | 1991-09-20 | 1995-08-09 | Qualcomm Inc | Methode d'enregistrement pour dispositif de radiocommunications mobile. |
US5642398A (en) * | 1991-09-20 | 1997-06-24 | Qualcomm Incorporated | Comprehensive mobile communications device registration method |
US5588043A (en) * | 1991-09-20 | 1996-12-24 | Qualcomm Incorporated | Comprehensive mobile communications device registration method |
EP0666007A4 (fr) * | 1991-09-20 | 1995-03-10 | Qualcomm Inc | Methode d'enregistrement pour dispositif de radiocommunications mobile. |
US5629975A (en) * | 1991-09-20 | 1997-05-13 | Qualcomm Incorporated | Comprehensive mobile communications device registration method |
EP0546758A3 (en) * | 1991-12-09 | 1993-12-01 | Motorola Inc | Mobile unit tracking system |
EP0546758A2 (fr) * | 1991-12-09 | 1993-06-16 | Motorola, Inc. | Système de poursuite d'une unité mobile |
USRE35916E (en) * | 1991-12-26 | 1998-10-06 | Dennison; Everett | Cellular telephone system that uses position of a mobile unit to make call management decisions |
US7289763B2 (en) | 1991-12-26 | 2007-10-30 | Emsat Advanced Geo-Location Technology, Llp | Cellular telephone system that uses position of a mobile unit to make call management decisions |
US6847822B1 (en) | 1991-12-26 | 2005-01-25 | Sycord Limited Partnership | Cellular telephone system that uses position of a mobile unit to make call management decisions |
US5546445A (en) * | 1991-12-26 | 1996-08-13 | Dennison; Everett | Cellular telephone system that uses position of a mobile unit to make call management decisions |
US6061558A (en) * | 1992-01-27 | 2000-05-09 | Highwaymaster Communications, Inc. | Method and apparatus for a nation-wide cellular telephone network |
GB2271692B (en) * | 1992-10-13 | 1997-04-09 | Marconi Gec Ltd | Vehicle location system |
GB2271692A (en) * | 1992-10-13 | 1994-04-20 | Marconi Gec Ltd | Vehicle location system |
EP0615392A1 (fr) * | 1993-03-11 | 1994-09-14 | DETECON DEUTSCHE TELEPOST CONSULTING GmbH | Méthode et appareil pour le transfert d'appel dans un réseau radio mobile dépendant de la localisation |
GB2283873B (en) * | 1993-11-08 | 1997-09-03 | Telia Ab | A communication and positioning system for use in a tracked trasportation system |
GB2283873A (en) * | 1993-11-08 | 1995-05-17 | Telia Ab | Railway communication and positioning system |
ES2102319A1 (es) * | 1993-11-08 | 1997-07-16 | Telia Ab | Disposicion para proporcionar comunicaciones y control posicional en una instalacion de guia. |
US7099625B1 (en) | 1998-07-07 | 2006-08-29 | Nec Corporation | Automobile communications method and system |
EP0984639A2 (fr) * | 1998-07-07 | 2000-03-08 | Nec Corporation | Méthode de communication pour véhicules et système pour ça |
EP0984639A3 (fr) * | 1998-07-07 | 2000-04-05 | Nec Corporation | Méthode de communication pour véhicules et système pour ça |
CN1081563C (zh) * | 1999-07-09 | 2002-03-27 | 深圳市永华电子系统股份有限公司 | 机动车联网定位、报警、监控、收费方法及系统 |
GB2353910A (en) * | 1999-09-03 | 2001-03-07 | Ibm | Asset tracking using local beacons |
US6738628B1 (en) | 1999-09-03 | 2004-05-18 | International Business Machines Corporation | Electronic physical asset tracking |
EP1209930A2 (fr) * | 2000-11-21 | 2002-05-29 | DaimlerChrysler AG | Architecture de planification de communication basée sur des voies et procédé de communication sans fil |
US6898432B1 (en) | 2000-11-21 | 2005-05-24 | Daimlerchrysler Research And Technology North America, Inc. | Route-based communication planning architecture and method for wireless communication |
EP1209930A3 (fr) * | 2000-11-21 | 2003-03-19 | DaimlerChrysler AG | Architecture de planification de communication basée sur des voies et procédé de communication sans fil |
US20110191024A1 (en) * | 2010-01-29 | 2011-08-04 | Research In Motion Limited | Portable mobile transceiver for gps navigation and vehicle data input for dead reckoning mode |
US9234760B2 (en) * | 2010-01-29 | 2016-01-12 | Blackberry Limited | Portable mobile transceiver for GPS navigation and vehicle data input for dead reckoning mode |
Also Published As
Publication number | Publication date |
---|---|
ATE54398T1 (de) | 1990-07-15 |
DE3672376D1 (de) | 1990-08-09 |
EP0199266B1 (fr) | 1990-07-04 |
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