EP0058596A1 - Selektives Übertragungssystem für Verkehrsnachrichten - Google Patents

Selektives Übertragungssystem für Verkehrsnachrichten Download PDF

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Publication number
EP0058596A1
EP0058596A1 EP82400178A EP82400178A EP0058596A1 EP 0058596 A1 EP0058596 A1 EP 0058596A1 EP 82400178 A EP82400178 A EP 82400178A EP 82400178 A EP82400178 A EP 82400178A EP 0058596 A1 EP0058596 A1 EP 0058596A1
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EP
European Patent Office
Prior art keywords
coded
transmission system
vehicles
transmitters
messages
Prior art date
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Granted
Application number
EP82400178A
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English (en)
French (fr)
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EP0058596B1 (de
Inventor
Jean Pierre Voisin
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Individual
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Individual
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/091—Traffic information broadcasting
    • G08G1/093—Data selection, e.g. prioritizing information, managing message queues, selecting the information to be output
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/016—Personal emergency signalling and security systems

Definitions

  • the present invention relates to a system for selective transmission of traffic information.
  • the purpose of this system is to communicate to the occupants of road vehicles emergency messages and / or specific traffic information of a portion of road and / or of a direction of traffic.
  • This system makes it possible for example to give either information relating to all the vehicles traveling on the same route and / or in the same direction, or information relating to all the vehicles approaching the vicinity of an agglomeration or a crossroads, this information being able to indicate the presence of a traffic jam, an accident, a deviation, etc., or information relating to road carriers such as information on the thaw barriers, etc.
  • the reception zone or cell is defined by the radio coverage of the associated transmitter, even if the range of said transmitter can be modulated by deliberate interference caused by surrounding transmitters.
  • the latter system has been described in a publication entitled: "A proposed road traffic information service” described in Reprinted from E.B.U. Review-Technical No. 166 (December 1977).
  • the subject of the invention is precisely a system for the selective transmission of road information which makes it possible to remedy these drawbacks.
  • it is not necessary to wait for the installation of all the infrastructure thereof to start the operational phase.
  • These on-board receivers consist of a first reception sub-assembly capable of receiving them. coded location signals, means for processing and storing said coded location signals, a second reception sub-assembly capable of receiving traffic information messages and the associated coded preambles, means for processing said preambles and means allowing the identification of information messages intended for each of said vehicles by comparison of said preambles to the last coded location signal kept in memory as long as said vehicles are capable of moving in at least one of said cells, following at least one route and / or at least one direction of traffic given.
  • all of the location transmitters that is to say of the first set of transmitters, work on the same frequency; the information is provided by an encoded alphanumeric signal the number of characters of which is not limited by the design of the system.
  • each transmitter of the first set is placed on a portion of road crossing the limits of this cell and near these limits so as to materialize said cell, as well as on the portions of roads crossing a crossroads located in said cell.
  • the physical materialization of the traffic information cells makes it possible to locate vehicles in difficulty, such as for example damaged vehicles. It should be noted that the traffic information transmission systems, known to date, did not envisage this location of such vehicles.
  • the transmission system further comprises distress transmitters mounted on the vehicles, one distress transmitter per vehicle, capable of transmitting alphanumeric distress messages.
  • coded comprising a distress signal, the coded location signal kept in memory in the on-board receivers and fixed data memorized characterizing each vehicle as well as a network of emergency receivers capable of receiving and identifying said coded messages, these emergency receivers being arranged in the vicinity of emergency centers each responsible for a group of cells.
  • the transmitters of the second set also called information transmitters, transmit, on medium waves, in amplitude modulation the traffic information messages and in frequency modulation or more exactly by frequency shifting the preambles preceding said messages.
  • these transmitters can transmit either on the same frequency and in timeshare so that transmitters, the radio coverage of which includes a common part, do not transmit simultaneously or, on different frequencies.
  • the on-board receivers further comprise means allowing the storage of fixed data characterizing the vehicles, on which said on-board receivers, and means allowing connection from the top -speaker to said on-board receivers, this connection being made after identification of the traffic information messages intended for said on-board receivers.
  • These on-board receivers are, moreover, each associated with an antenna and with a loudspeaker which can be those of a "car radio", that is to say a radio receiver of conventional type.
  • the French or other territory is divided into a number of zones of variable dimensions, called traffic information cells; some of these cells have been represented in FIG. 1 which represents the arrangement on a region of said territory of the various elements constituting the selective transmission system of the invention.
  • the limits of these cells are defined by means of a first set of transmitters, also called location transmitters.
  • location transmitters are located on the portions of roads 4 crossing the limits of the traffic information cells, in this case the transmitters bear the reference 2a, and on the portions of routes 4 crossing a crossroads such as 6 located in one of the cells, in this other case, said transmitters bear the reference 2b.
  • the location transmitters 2a actually physically materialize said traffic information cells.
  • the location transmitters 2 are capable of transmitting an alphanumeric coded location signal, an example of which will be given later, making it possible to identify one of the traffic information cells, the route and / or the direction of traffic followed by vehicles such as 8 moving in at least one of said cells.
  • Each of these vehicles represented in the form of rectangles, is associated with an arrow indicating the direction of traffic followed by said vehicle.
  • These localization transmitters 2 which can be electromagnetic loops, radio beacons operating in very high frequency (VHF) and in frequency modulation (FM), laser or infrared transmitters, etc. all emit on the same frequency and have extremely reduced radio ranges, that is to say between 10 and 40 meters, and not contiguous and emit continuously repeatedly.
  • VHF very high frequency
  • FM frequency modulation
  • laser or infrared transmitters, etc. all emit on the same frequency and have extremely reduced radio ranges, that is to say between 10 and 40 meters, and not contiguous and emit continuously repeatedly.
  • a vehicle 8 traveling on roads 4 equipped with location transmitters 2 is provided with a so-called on-board receiver, shown diagrammatically by a cross bearing the reference 10; this receiver is actually part of a whole called on-board equipment which we will give later the structure and the functioning.
  • These on-board receivers 10, in permanent standby, are capable of receiving the coded alphanumeric location signals transmitted by the location transmitters 2 and of keeping in memory the last coded location signal received.
  • the vehicle considered will first meet the location transmitter 2a of the cell it has just crossed, then that of the cell that it addresses and from which it will keep the coded location signal in memory until it leaves the cell.
  • these on-board receivers 10 are capable of detecting traffic information messages sent, in the case of French territory, from the regional traffic information centers (CRICR) and from the national traffic information center. (CNIR), by means of a second set of transmitters, also called information transmitters.
  • CRICR regional traffic information centers
  • CNIR national traffic information center.
  • One of these information transmitters has been represented in FIG. 1 and bears the reference 12.
  • These information transmitters 12 transmit either on the same frequency and in timeshare, so that two transmitters whose radio coverage includes a common part do not transmit simultaneously, or on different frequencies. In the latter case, the frequency adjustment of the on-board receiver 10 is then carried out automatically as soon as the coded location signals transmitted by the location transmitters are received; these localization signals sation then control the selection of the tuning frequency of the on-board receiver 10.
  • the information transmitters 12 are for example medium wave transmitters, that is to say transmitting in a frequency range from 500 at 1500 kilohertz (kHz).
  • Each of these information transmitters 12 transmits, in amplitude modulation, traffic information messages intended for a certain number of cells, the number of these cells constituting the radio-electric coverage area of said transmitter.
  • These traffic information messages are preceded by a coded alphanumeric preamble, analogous to the coded alphanumeric signal of localization emitted by the transmitters of localization 2, defining a cell, or a group of cells, the route and possibly the direction of traffic followed. by vehicles moving in the said cell or cells.
  • these preambles can define a vehicle category and / or a language spoken by the occupants of certain vehicles in the case of transmission of very selective information messages.
  • each traffic information message is followed by an end of message code, transmitted in frequency modulation or more precisely in FSK, indicating the end of said traffic information message.
  • distress transmitters 2 are in reality, like the on-board receiver 10, part of the on-board equipment.
  • These distress transmitters 14, all operating on the same frequency and in short waves, that is to say in a frequency range from 3 to 30 megahertz (MHz), are capable of transmitting coded alphanumeric messages consisting of a distress signal, the coded location signal previously stored and fixed data stored characterizing each vehicle and / or characterizing the language spoken by the occupants of said vehicle.
  • the fixed data characterizing each vehicle are for example the category of said vehicle, its brand, its color, its registration number, etc.
  • the transmissions of the distress messages can be triggered either manually by one of the occupants of the vehicle in difficulty, for example by means of a conventional push button or, following a violent shock resulting from a accident, by means of an inertia shock detector, the supply of said detector being able to be made by the battery of said vehicle through an accumulator mounted in buffer.
  • an inertia shock detector the supply of said detector being able to be made by the battery of said vehicle through an accumulator mounted in buffer.
  • the supply to the distress transmitter 14 will then be ensured for a sufficient time by the accumulator.
  • the emission of distress messages causes the operation of a buzzer, installed in said vehicle and intended to warn the occupants of it.
  • a correction signal similar to the distress message previously transmitted can be sent by the occupants of said vehicle for example by means of a push button of conventional type.
  • These distress messages are likely to be received by a network of emergency receivers, shown diagrammatically by a rectangle bearing the reference 16, arranged in the vicinity of the emergency assistance centers, each of a group of traffic information cells.
  • These emergency receivers 16, after identification or decoding of the distress messages, can store and display said messages as well as trigger a visual and / or audible alarm located in the relevant emergency center.
  • One of these rescue centers has been represented in FIG. 1 and bears the reference 18.
  • the limits of a rescue zone corresponding to this rescue center 18 and corresponding to a given number of information cells road, or four cells in Figure 1, have been shown schematically in solid lines in said figure.
  • These emergency centers 18 can be, for example, as far as French territory is concerned, the stations of the emergency medical aid services (SAMU) and the regional emergency medical services (SMUR), the fire stations, etc ...
  • SAMU stations of the emergency medical aid services
  • SUR regional emergency medical services
  • the on-board equipment of the vehicles is represented essentially consisting of the on-board receiver 10 and the distress transmitter 14.
  • the on-board receiver 10 is associated with an antenna 20 and with a loudspeaker 22 provided with a power amplifier 24.
  • This antenna 20 and this loudspeaker 22 can be those of a radiophonic receiver of conventional or auto type. radio 26, if the vehicle in question has one.
  • the on-board receiver consists of two reception subsets and a data processing unit.
  • the first of these two reception subsets is capable of receiving the coded location signals transmitted by location transmitters 2.
  • the nature of these location receivers 28 depends on the nature location transmitters 2. In fact, if the location transmitter 2 transmits in frequency modulation, said location receiver 28 will operate in frequency modulation.
  • Each coded location signal received will then be demodulated by means of a demodulator such as 30, then processed in a data processing system 32 and finally memorized in a memory 34.
  • the reception of another coded location signal will automatically erase the signal. previously stored code.
  • the second reception subset is capable of receiving traffic information messages as well as the coded preambles preceding said messages, these messages and preambles being transmitted by the information transmitters. 12.
  • the coded preamble of each traffic information message, transmitted in frequency modulation will first of all be demodulated by means of a demodulator such as 38, preceded by a bandpass filter 37, then processed in a system preprocessing 40.
  • the coded preamble will then be compared by means of a comparator 42 to the coded location signal stored in the memory 34. If part of the coded preamble is identical to the coded stored location signal, the hearing of the message traffic information can take place.
  • the tapping that is to say the connection of the loudspeaker 22 to the information receiver 36, can be made, either manually by the occupants of the vehicle in question, said occupants having been warned by means of an audible and / or visual alarm, or automatically by means of a switch.
  • the control system allowing the wiretapping and the automatic switching or not of the speaker 22 are shown diagrammatically by the device 44.
  • the device 44 interrupts the listening of said car radio, if the latter is in operation, and connects the speaker as well as the low frequency stages of said car radio, the onboard receiver then being integrated therein, so that traffic information messages can be heard by the occupants of said vehicle.
  • the device 44 reconnects the loudspeaker 22 on the radio 26 and the occupants of the vehicle can again listen to the radio broadcast previously interrupted.
  • the recommutation or reconnection of the loudspeaker 22 to the radio 26 is carried out after the end of message signal which follows the traffic information message has been detected by a detector 46.
  • the data processing system described above that is to say the means allowing the processing of the coded preambles and the coded location signals as well as the storage of said coded location signals, is further constituted by a memory 50 containing the fixed data characterizing each vehicle, that is to say the vehicle category, its brand, its color, its registration number, etc ... as well as the language spoken by the occupants of said vehicle.
  • the coded preamble preceding said traffic information message then includes, in more than the part corresponding to the coded location signal, a part corresponding to this fixed data stored in the memory 50.
  • hearing the traffic information message, for a vehicle category and / or a certain language is done after having compared by means of comparator 42 the corresponding part of the preamble to the fixed data stored at 50.
  • a vehicle in difficulty can send a coded distress message comprising the coded alphanumeric location signal stored in memory 34 as well as the fixed data characterizing said vehicle stored in memory 50.
  • This message distress in order to be transmitted in frequency modulation, must be modulated by means of a modulator such as 52.
  • the reference 54 represents one of the means making it possible to trigger the emission of said distress message, one of these means being for example the inertia shock detector and the reference 56 the buzzer indicating to the occupants of said vehicle the emission of said distress messages.
  • the memory 34 and the memory 50 can be permanently supplied by the battery of the vehicle on which the on-board equipment is installed, the rest of the said equipment being put on standby as soon as the contact is established.
  • FIG. 3 the different formats of the coded alphanumeric signals used are shown. its in the transmission system according to the invention.
  • the first format bearing the reference e represents the coded location signal
  • the second format bearing the reference p represents the coded preamble sent before the traffic information messages
  • the third format bearing the reference d represents the distress message.
  • These three formats ⁇ l, p, d are preceded by a starting code making it possible to identify them for example by a code LL representing the starting code for the coded identification signal e, PP for the coded preamble p and DD for the distress message d.
  • These different formats then consist for example of an E character, a Z character, two CC characters, the first character corresponding to a group of cells, and the second to a cell of this group, two characters II and with a character S respectively indicating the number of the information transmitter, optionally used for the selection of the tuning frequency of the on-board receiver 10 and in particular of the information receiver 36 when the information transmitters transmit on different frequencies, the number of the emergency zone, the cell number, the route and the direction of traffic followed by the vehicles moving in said cell.
  • the second signal p corresponding to the coded preamble, comprises two additional characters, a character T and a character L respectively indicating the category of the vehicle and the language spoken by the occupants of said vehicle.
  • this comprises, in addition to the two characters T and L, two additional characters CO indicating for example the make of the vehicle, its color or its registration number. lation, these characters allowing identification by the emergency centers of said vehicle in the event of an accident, as well as a DD code corresponding to the distress signal emitted by the distress transmitters.
  • a fourth signal is shown bearing the reference f. This signal represents the end of message signal sent after the transmission of traffic information messages.
  • the number of traffic information cells as well as their size depend only on the number of messages that one wishes to send as well as on the level of selectivity of said messages. Consequently, the number of location transmitters, the number of information transmitters, as well as the number of emergency centers can be modified as a function of the number of said cells.
  • the number of location transmitters depends on their radio range.
  • the reception of coded location signals emitted by said transmitters may take place at least once by a vehicle traveling at a speed of 140 kilometers per hour (km / h) while ensuring sufficient protection against -vis other coded location signals from neighboring location transmitters.
  • This radio range as well as the spacing between two location transmitters can be reduced as a function of the maximum speed authorized for said vehicles, that is to say for a speed of 90 km / h, the radio range of said location transmitters may be .20 m and the spacing between two location transmitters of 100 m.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Multimedia (AREA)
  • Computer Security & Cryptography (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Traffic Control Systems (AREA)
EP19820400178 1981-02-06 1982-02-03 Selektives Übertragungssystem für Verkehrsnachrichten Expired EP0058596B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8102367 1981-02-06
FR8102367A FR2499739B1 (fr) 1981-02-06 1981-02-06 Systeme de transmission selectif d'informations routieres

Publications (2)

Publication Number Publication Date
EP0058596A1 true EP0058596A1 (de) 1982-08-25
EP0058596B1 EP0058596B1 (de) 1987-01-21

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EP19820400178 Expired EP0058596B1 (de) 1981-02-06 1982-02-03 Selektives Übertragungssystem für Verkehrsnachrichten

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EP (1) EP0058596B1 (de)
DE (1) DE3275247D1 (de)
FR (1) FR2499739B1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025410A1 (de) * 1994-03-16 1995-09-21 Detemobil Deutsche Telekom Mobilnet Gmbh Verfahren zur ortsbestimmung von mobilstationen
EP0704831A1 (de) * 1994-08-31 1996-04-03 Toyota Jidosha Kabushiki Kaisha Infrastruktur für ein Fahrzeugkommunikationssystem
EP1022704A1 (de) * 1999-01-22 2000-07-26 Rover Group Limited Verkehrsinformationssystem für Fahrzeuge

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2061876A1 (de) * 1970-12-16 1972-07-06 Licentia Gmbh System zur Funk-Übertragung von Nachrichten, insbesondere von Verkehrsnachrichten, an mit Empfängern ausgerüstete Fahrzeuge
DE2107814A1 (de) * 1971-02-18 1972-08-24 Licentia Gmbh System zur Funk-Übertragung von Nachrichten an Fahrzeuge, insbesondere Verkehrswarnfunksystem
GB2045988A (en) * 1979-03-29 1980-11-05 Repa Feinstanzwerk Gmbh Emergency signalling system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2061876A1 (de) * 1970-12-16 1972-07-06 Licentia Gmbh System zur Funk-Übertragung von Nachrichten, insbesondere von Verkehrsnachrichten, an mit Empfängern ausgerüstete Fahrzeuge
DE2107814A1 (de) * 1971-02-18 1972-08-24 Licentia Gmbh System zur Funk-Übertragung von Nachrichten an Fahrzeuge, insbesondere Verkehrswarnfunksystem
GB2045988A (en) * 1979-03-29 1980-11-05 Repa Feinstanzwerk Gmbh Emergency signalling system

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
NACHRICHTEN ELEKTRONIK, vol. 34, no. 2, février 1980 HEIDELBERG (DE) "Nachrichtentechnik im Verkehr, Ein Notfunksystem für Autofahrer" pages 60-62 *
WESCON TECHNICAL PAPERS, vol. 16, septembre 1972 LOS ANGELES (US) L. SCHIFF et al.: "A microwave system for distress signalling by disabled motorists" pages 1-6 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995025410A1 (de) * 1994-03-16 1995-09-21 Detemobil Deutsche Telekom Mobilnet Gmbh Verfahren zur ortsbestimmung von mobilstationen
US5933114A (en) * 1994-03-16 1999-08-03 Detemobil Deutsche Telekom Mobilnet Gmbh Process and apparatus for locating mobile stations
EP0704831A1 (de) * 1994-08-31 1996-04-03 Toyota Jidosha Kabushiki Kaisha Infrastruktur für ein Fahrzeugkommunikationssystem
US5784005A (en) * 1994-08-31 1998-07-21 Toyota Jidosha Kabushiki Kaisha Communications infrasturcture system for vehicles
EP1022704A1 (de) * 1999-01-22 2000-07-26 Rover Group Limited Verkehrsinformationssystem für Fahrzeuge

Also Published As

Publication number Publication date
EP0058596B1 (de) 1987-01-21
FR2499739A1 (fr) 1982-08-13
FR2499739B1 (fr) 1985-07-19
DE3275247D1 (en) 1987-02-26

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