WO2014079962A1 - Device and method for transmitting data between a vehicle and a device on the ground - Google Patents

Device and method for transmitting data between a vehicle and a device on the ground Download PDF

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Publication number
WO2014079962A1
WO2014079962A1 PCT/EP2013/074445 EP2013074445W WO2014079962A1 WO 2014079962 A1 WO2014079962 A1 WO 2014079962A1 EP 2013074445 W EP2013074445 W EP 2013074445W WO 2014079962 A1 WO2014079962 A1 WO 2014079962A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna
ground
vehicle
electronic device
disturbance
Prior art date
Application number
PCT/EP2013/074445
Other languages
French (fr)
Inventor
Jean-Pierre Ancelin
Original Assignee
Capsys
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
Application filed by Capsys filed Critical Capsys
Priority to ES13795469.9T priority Critical patent/ES2630324T3/en
Priority to EP13795469.9A priority patent/EP2923350B1/en
Publication of WO2014079962A1 publication Critical patent/WO2014079962A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L1/00—Devices along the route controlled by interaction with the vehicle or vehicle train, e.g. pedals
    • B61L1/02—Electric devices associated with track, e.g. rail contacts
    • B61L1/10—Electric devices associated with track, e.g. rail contacts actuated by electromagnetic radiation; actuated by particle radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00—Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal
    • B61L3/02—Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control
    • B61L3/08—Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically
    • B61L3/12—Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically using magnetic or electrostatic induction; using radio waves
    • B61L3/125—Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically using magnetic or electrostatic induction; using radio waves using short-range radio transmission
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/01—Detecting movement of traffic to be counted or controlled
    • G08G1/02—Detecting movement of traffic to be counted or controlled using treadles built into the road
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3225—Cooperation with the rails or the road
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C5/00—Registering or indicating the working of vehicles
    • G07C5/008—Registering or indicating the working of vehicles communicating information to a remotely located station

Definitions

  • the present invention relates to the field of means for transmitting data between a vehicle, for example a tramway, a train or a bus, and a device in the form of a device. when passing through a location along its path, unilaterally or bilaterally.
  • the data to be transmitted may be, without limitation, for example vehicle identification data, desired control data (eg traffic light commands, switch commands, gate controls, or other desired commands). ), vehicle position or speed data, vehicle specific or load data, trip - specific data, specific data relating to other vehicles.
  • desired control data eg traffic light commands, switch commands, gate controls, or other desired commands.
  • the data transmission systems between a vehicle and a ground device operate in the steady-state interrogation / response mode.
  • Such devices have the disadvantage of polluting the electromagnetic environment when the emissions are not necessary (for example when the vehicle is not present in the environment of the device on the ground and present the risk of generating false orders.
  • the object of the present invention is to improve the transmission of data between a vehicle and a device so that it increases safety.
  • a method of transmitting data between a vehicle equipped with an on-board electronic device comprising a signal transmission / reception circuit equipped with at least one on-board antenna and a device ground electronics including a circuit transmission / reception of signals, the vehicle being able to move on an equipped route at a location of at least one fixed antenna.
  • the electronic device on the ground detects a disturbance or variation of a magnetic field to which said fixed antenna is sensitive, induced during the passage of a vehicle in the vicinity of this fixed antenna.
  • the electronic device on the ground compares at least part of said disturbance or variation with at least one stored decision criterion and generates a recognition signal only if said at least part of said perturbation corresponds to or satisfies said at least one decision criterion.
  • the electronic ground device authorizes and synchronizes data exchanges between the signal transmission / reception circuits of the on-board electronic device and the electronic device on the ground, via said on-board antenna. and said fixed antenna while coupled together.
  • the data exchanges are authorized and synchronized between the electronic device on the ground and the vehicle actually recognized or identified and with a real knowledge of its position.
  • said fixed antenna may comprise an antenna-metal loop which is connected to the electronic device on the ground and fed by the latter so as to generate a magnetic field which can be disturbed during the passage of the vehicle and in which the electronic device on the ground detects the disturbance or variation of the magnetic field generated by said loop antenna, induced during the passage of a vehicle.
  • the detection of the disturbance or variation of the magnetic field can be achieved by detecting the variation of the inductance of the antenna-metal loop.
  • the fixed antenna may comprise a magnetic sensor with Hall effect or magnetoresistive, the electronic device on the ground detecting the disturbance or variation a signal delivered by this sensor, induced during the passage of a vehicle.
  • Said decision criterion may comprise a template having at least one maximum value and at least one minimum value corresponding to maximum and minimum disturbances or variations of the magnetic field.
  • Detection of the disturbance or variation of the magnetic field can be performed by sampling.
  • the signal transmission / reception circuits of the vehicle and the electronic ground device may comprise radio frequency antennas through which said data exchanges are carried out.
  • a device for transmitting data between a vehicle equipped with an on - board electronic device comprising a signal transmission / reception circuit equipped with at least one on - board antenna and an electronic device with a circuit comprising: transmission / reception of signals, the vehicle being able to move on an equipped route at a location of at least one fixed antenna.
  • the in-line electronic device may comprise means for detecting a disturbance or variation of a magnetic field to which said fixed antenna, sensed during the passage of a vehicle in the vicinity of this fixed antenna, is sensed, a detection circuit for detecting the disturbance or variation of the magnetic field of the antenna - metal loop induced during the movement of a vehicle.
  • the electronic device may comprise a comparison circuit for comparing at least a portion of said perturbation or variation with at least one decision criterion stored in a storage circuit and for generating a recognition signal only if said at least one part said perturbation corresponds or satisfies said at least one decision criterion.
  • the electronic ground device may comprise means for authorizing and synchronizing, under the effect of said signal of recognition, of data exchanges between the signal transmission / reception circuits of the on - board electronic device and the electronic device on the ground via said on - board antenna and said fixed antenna while they are coupled together.
  • the fixed antenna may include a loop antenna connected to a current generator.
  • the signal transmitting / receiving circuit of the electronic ground device may be connected to the loop antenna and may include means for the current generator and the signal transmitting / receiving circuit of the electronic device to operate. are not connected to the loop antenna at the same time.
  • the fixed antenna may include a magnetic Hall or magnetoresistive sensor.
  • the electronic ground device and the onboard device may include radio antennas connected to the respective signal transmission / reception circuits.
  • the electronic device on the ground and the on-board electronic device may include means for storing data to be transmitted.
  • FIG. 1 schematically shows a so-l equipment and a vehicle
  • FIG. 2 shows a diagram of an electronic device of said equipment on the ground
  • FIG. 3 represents a diagram of an onboard electronic device equipping said vehicle
  • FIGS. 4a to 4e show operating diagrams of the electronic device and the on-board electronic device
  • - Figure 5 shows a curve of the magnetic signature of a vehicle and a sampling mode
  • - Figure 6 shows a curve of the magnetic signature of another vehicle and another sampling mode
  • FIG. 8 shows another electronic device of a ground equipment.
  • a particular or expected vehicle 1 can be driven on a specific path 2.
  • the vehicle 1 can be a tramway or a train that can run on a specific path 2 determined by rails 3 and 4.
  • the vehicle 1 could be a bus that can travel on a specific path 2 delimited laterally.
  • the specific path 2 is equipped with a fixed antenna formed specifically by an antenna-loop or metal coil 5 located on the ground or buried at shallow depth and placed between the rails 3 and 4 so that the vehicle 1 can pass over.
  • This loop loop antenna comprises one or more turns, for example wound in the form of a rectangle so as to have two longitudinal branches 5a and 5b approximately parallel to the rails 3 and 4 and two branches approximately transverse 5c and 5 d.
  • ground loop antenna 5 The ends of the ground loop antenna 5 are connected by electrical connection wires 6 and 7 which pass under a rail and which join an electronic device 8 on the ground, housed for example in a cabinet located close to the specific path. 2.
  • the electronic device 8 comprises a current generator 9 connected to the electrical wires 6 and 7 so as to feed the ground loop antenna 5 into a modulated current, for example an alternating current of such so that the antenna-loop in so 5 generates in its environment a desired magnetic field such that this magnetic field can be disturbed or modified by the metal members of the vehicle 1 during the passage of the latter above the antenna- Loop at 5.
  • a modulated current for example an alternating current of such so that the antenna-loop in so 5 generates in its environment a desired magnetic field such that this magnetic field can be disturbed or modified by the metal members of the vehicle 1 during the passage of the latter above the antenna- Loop at 5.
  • the ground electronic device 8 further comprises a circuit 10 for detecting the variation of the inductance of the loop antenna at the ground 5, for example connected to the electric wires 6 and 7. or to the connections of these.
  • the electronic ground device 8 also comprises a memory circuit 11 in which are previously stored specific decision criteria corresponding to the particular vehicle or expected 1.
  • the electronic device on the ground 8 also comprises a comparison circuit 12, able to compare the signals delivered by the detection circuit 10 and the decision criteria stored in the memory circuit 11 and able to deliver on an output a signal S i particular identification of the particular vehicle expected 1 if said disturbance corresponds or meets the specific decision criteria or stored stored associated with this particular vehicle or expected 1.
  • the detection circuit 10 and the comparison circuit 12, associated with the memory circuit 1 are adapted to carry out the detection and the comparison by sampling, according to successive phases, for example by comparing the successive values variations of the inductance at stored maximum and minimum pairs of values, forming a template, corresponding to the effects of the vehicle 1 on the magnetic field as it advances over the loop antenna to the ground. 5.
  • an expected vehicle 1 can be identified by detecting the first part of its total magnetic signature, ie by detecting the first part of the variation of the inductance of the loop antenna in so as the vehicle progresses, corresponding to the disturbance of the magnetic field of the loop antenna in the earth.
  • the electronic ground device 8 further comprises an electronic circuit 1 3 for managing and storing data, connected to a device for transmitting / receiving signals 14.
  • the electronic data management and storage circuit 13 has an input connected to the output of the comparison circuit 12 so as to be subjected to the identification signal Si.
  • the signal transmitting / receiving device 14 is connected to the connection wires 6 and 7 of the loop antenna at the ground 5 or to their electrical connections via electrical connection wires 14a and 14b.
  • the vehicle 1 is equipped with an on-board electronic device 15 which comprises an electronic circuit 16 for managing and storing data connected to a signal transmission / reception circuit 17 connected to An antenna 1 8.
  • This antenna 1 8 is for example located under the vehicle 1 so as to be coupled to the antenna-loop in so 5 when they are close to one another.
  • FIG. 4a illustrates an operating diagram of the current generator 9
  • FIG. 4b illustrates an operating diagram of the detection circuit
  • FIG. 4c illustrates an operating diagram of the comparison circuit 12
  • FIG. 4d illustrates an operating diagram of the transmission / reception circuit 14.
  • FIG. 4e illustrates an operating diagram of the on-board electronic device 15.
  • the current generator 9 is in the connected state 100 to the ground loop antenna 5 and feeds the latter and the detection circuit 10 is in the connected state 101 to the ground loop antenna 5.
  • electronic switches 100a and 100b provided for this purpose are in the "closed" state.
  • the signal transmission / reception circuit 14 is in the disconnected state 102 of the ground loop antenna 5.
  • the electronic switches 102a and 102b provided for this purpose are in the "open" state.
  • the on-board electronic device 15 is in the state of
  • the comparison circuit 12 in connection with the detection circuit 10 and the memory circuit 11 engages and executes a magnetic recognition phase 103 .
  • the comparison circuit 12 delivers a recognition signal Sr.
  • the current generator 9 goes off-line from the ground loop antenna 5 and no longer supplies the latter.
  • the current generator 9 then starts a phase 104 of no power supply of the ground loop antenna 5.
  • the detection circuit 10 goes off-line from the ground loop antenna 5 and starts then a disconnection phase 105.
  • the switches 100a and 100b go to the "open" state
  • the signal transmission / reception circuit 14 goes to the state connected to the ground loop antenna 5 and starts a connection phase 106.
  • the switches 102a and 102b go to the "closed" state.
  • the expected vehicle 1 being still in an area in which the ground loop antenna 5 and the antenna 18 of the electronic device embedded 15 are coupled by radio, exchanges of signals are possible between them.
  • the electronic circuit 13 for managing and storing data of the electronic ground device 8 transmits a first activation and synchronization signal 107 to the electronic data management and storage circuit 16 of the on-board electronic device 15 via the signal transmission / reception circuit 14, the ground loop antenna 5, the antenna 18 and the signal transmission / reception circuit 17.
  • the electronic data management and storage circuit 16 of the on-board electronic device 15 changes from the "standby" state to the "active" state. That is to say, it starts a phase 108 during which it is able to transmit and receive signals by its antenna 18.
  • the signal transmission / reception device 10 is placed in the state connected to the loop antenna 5, the connection phase 106 ending.
  • the detection circuit 10 is placed in the connected state to the ground loop antenna 5, the disconnection phase 105 ending, and the current generator 9 is placed at the state connected, the disconnection phase 104 ending.
  • the switches 100a and 100b go to the "closed” state and the switches 102a and 102b go to the "open” state.
  • the onboard electronic device 1 5 is placed in the state of "standby", now only the function "listens” and stopping the "transmission” function.
  • the equipment is then waiting for a vehicle expected 1 following on the route 2.
  • a first portion 200 of a magnetic signature curve C 1 represented by a variation of the value of the inductance of the ground loop antenna 5 during the passage of an expected vehicle 1 , comprises a rising portion 201, followed by an irregular top-shaped portion 202, followed by a descending portion 203.
  • This first portion 200 corresponds to the passage of the front part of an expected particular vehicle such as a tram or a train, equipped with a front bogie.
  • the magnetic signature curve J depends on the abscissa of the expected vehicle speed 1 and can be considered as valid for a range of usual speeds.
  • the first portion 201 is followed by a second portion 204 located at a level below the crown portion 202 and corresponds to the passage of the floor of such an expected vehicle 1.
  • This second portion 204 is followed by a third portion 205 approximately symmetrical with the first portion 200, having an apex and corresponding to the passage of a rear bogie of the vehicle.
  • a minimum value point curve Cmin and a curve Cmax of points are recorded in the memory circuit 11 as criteria. maximum values enveloping at least the upper part of the first part 201 of the magnetic signature curve C 1.
  • the comparison circuit 12 is then loaded, during the detection phase 103, to deliver the recognition signal Sx only if the values from the detection circuit 10, obtained by segmentation sampling, as the progress is made. of a vehicle above the ground loop antenna are located between the corresponding values of the curves Cmax and Cmin. This vehicle being an expected vehicle 1, the data exchange phases 106 and 107 are then authorized.
  • the vehicle passing over the ground loop antenna 5 is not an expected vehicle 1 and the recognition signal Sr is not delivered.
  • a magnetic signature curve C_2_ representing a variation of the value of the inductance of the antenna-ground loop 5 during the passage of another expected vehicle 1, comprises, after a rising portion 300, a 300 part almost constant.
  • This almost constant portion 300 corresponds to the passage of another expected vehicle 1 such as a bus, whose lower metal composition is almost constant over its entire length.
  • the comparison circuit 12 is then loaded, during the detection phase 103, to deliver the recognition signal Sx only if the values from the detection circuit 10, obtained by sampling, as the progress of A vehicle above the loop antenna at the ground 5 is located between the values Vmax and Vmin at the end of a first portion of the substantially constant portion 301 of the curve C2. As this vehicle is an expected vehicle 1, the data exchange phases 106 and 107 are then authorized.
  • the vehicle passing over the ground loop antenna 5 is not an expected vehicle 1 and the recognition signal Sr is not delivered.
  • the comparison circuit 12 can then differentiate the expected vehicles respectively corresponding to these different criteria and deliver differentiated Sr signals such that the ground electronic device 8 and the on-board electronic device 15 exchange clean and differentiated data attributed to these expected vehicles. different, during the respective phases 106 and 107.
  • the electrical connections 14a and 14b between the signal transmission / reception circuit 14 of the electronic ground device 8 and the loop antenna 5 can be suppressed and this transmission circuit / receiving signals 14 can be connected to an antenna 19.
  • the 106 and 1 07 can be realized by radio between this antenna 19 and the antenna 1 8 of the onboard device 15.
  • the current generator 9 and the detection circuit 10 can be directly connected to the loop antenna 5 and stay connected to it.
  • an embodiment may have the following provisions.
  • the antenna-loop wire 5 may have a diameter of between one-fifth of a millimeter and two millimeters and the number of turns of the loop antenna 5 can be between one and twenty.
  • the distance between the longitudinal branches 5a and 5b of the loop antenna 5 may be between twenty centimeters and five meters and the length of this loop antenna 5 may be between twenty centimeters and twelve meters.
  • the intensity of the current delivered by the current generator 9 may be between one and one hundred milliamps. For an expected vehicle 1 traveling at about ten meters per second, it may be sufficient to provide about fifteen samples, each of a duration equal to about fifteen milliseconds and at a rate of twenty five milliseconds, to achieve recognition of a vehicle expected 1.
  • the data exchanges between the loop antenna 5 and the on-board antenna 1 8 may for example be carried out via a frequency-modulated frequency-based carrier, for example between 9 and 150 kilohertz.
  • the radio data interchange between the on-board antenna 1 8 and the antenna 19 can be carried out via a frequency-modulated high-frequency carrier, for example between four hundred megaHertz and five gigabytes.
  • an electronic ground device 20 differs from the electronic ground device 8 of the example of FIG. 7 only in the following manner.
  • the fixed antenna formed by a loop antenna 5 is replaced by an antenna formed specifically by a magnetic sensor Hall effect or magnetoresistive (AM, GMR) 21 sensitive to the Earth's magnetic field.
  • AM, GMR magnetoresistive
  • the current generator 9 and the detection circuit 10 are replaced by an electronic circuit 22 for supplying the sensor 20, able to deliver to the comparator 12 the variations of a signal coming from the sensor 20 and corresponding to perturbations or variations of the field ground magnetic induced during the passage of a vehicle.
  • the electronic device in the same way operates in an equivalent manner to the electronic device in accordance with the above-mentioned example.
  • the data exchanges between the loop antenna 5 used for the magnetic detection and the on-board antenna 1 8 can be reduced to exchanges of synchronization, for example the first activation and synchronization signal 107 mentioned above.
  • the desired data exchanges between the on-board device and the on-board device can be realized via other radio frequency antennas.

Abstract

A method and device for transmitting data between a vehicle provided with an on-board electronic device (15) comprising a circuit for transmitting/receiving signals provided with an on-board antenna and an electronic device on the ground (8) comprising a circuit for transmitting/receiving signals and at least one fixed antenna (5) placed on a track (2). The electronic device on the ground (8) detects a disturbance in a magnetic field to which said fixed antenna is sensitive, when a vehicle passes in the vicinity of this fixed antenna. The electronic device on the ground (8) compares said disturbance with at least one stored decision criterion. The electronic device on the ground (8) authorises and synchronises data exchanges between the circuits for transmitting/receiving signals of the on-board electronic device and the electronic device on the ground, if said disturbance corresponds to said decision criterion, via the onboard antenna and the fixed antenna.

Description

Procédé et dispositif de transmission de données entre un véhicule et un dispositif au sol La présente invention concerne le domaine des moyens permettant de transmettre des données entre un véhicule, par exemple un tramway, un train ou un bus, et un dispositif au so l, lors de son passage à un endroit le long de son parcours, unilatéralement ou bilatéralement.  The present invention relates to the field of means for transmitting data between a vehicle, for example a tramway, a train or a bus, and a device in the form of a device. when passing through a location along its path, unilaterally or bilaterally.
Les données à transmettre peuvent être, sans limitation, par exemple des données d' identification du véhicule, des données de commandes souhaitées (par exemple des commandes de feux de signalisation, des commandes d' aiguillage, des commandes de barrières, ou autres commandes souhaitées), des données de position ou de vitesse du véhicule, des données spécifiques au véhicule ou à sa charge, des données spécifiques au parcours, des données spécifiques relatives à d' autres véhicules.  The data to be transmitted may be, without limitation, for example vehicle identification data, desired control data (eg traffic light commands, switch commands, gate controls, or other desired commands). ), vehicle position or speed data, vehicle specific or load data, trip - specific data, specific data relating to other vehicles.
Selon une disposition couramment utilisée, les systèmes de transmission de données entre un véhicule et un dispositif au sol fonctionnent sur le mode interrogations/réponses en régime permanent. De tels dispositifs présentent l ' inconvénient de polluer l ' environnement électromagnétique lorsque les émissions ne sont pas nécessaires (par exemple lorsque le véhicule n' est pas présent dans l ' environnement du dispositif au sol et présentent le risque d' engendrer des fausses commandes .  According to a commonly used arrangement, the data transmission systems between a vehicle and a ground device operate in the steady-state interrogation / response mode. Such devices have the disadvantage of polluting the electromagnetic environment when the emissions are not necessary (for example when the vehicle is not present in the environment of the device on the ground and present the risk of generating false orders.
Le but de la présente invention est d' améliorer les transmissions des données entre un véhicule et un dispositif au so l et ainsi d' augmenter la sécurité.  The object of the present invention is to improve the transmission of data between a vehicle and a device so that it increases safety.
Selon un mode de réalisation de la présente invention, il est proposé un procédé de transmission de données entre un véhicule équipé d'un dispositif électronique embarqué comprenant un circuit d' émission/réception de signaux muni d' au moins une antenne embarquée et un dispositif électronique au sol comprenant un circuit d' émission/réception de signaux, le véhicule pouvant se déplacer sur un parcours équipé en un endroit d' au moins une antenne fixe. According to one embodiment of the present invention, there is provided a method of transmitting data between a vehicle equipped with an on-board electronic device comprising a signal transmission / reception circuit equipped with at least one on-board antenna and a device ground electronics including a circuit transmission / reception of signals, the vehicle being able to move on an equipped route at a location of at least one fixed antenna.
Le dispositif électronique au sol détecte une perturbation ou variation d'un champ magnétique auquel est sensible ladite antenne fixe, induite lors du passage d'un véhicule dans le voisinage de cette antenne fixe.  The electronic device on the ground detects a disturbance or variation of a magnetic field to which said fixed antenna is sensitive, induced during the passage of a vehicle in the vicinity of this fixed antenna.
Le dispositif électronique au sol compare au mo ins une partie de ladite perturbation ou variation à au moins un critère de décision mémorisé et génère un signal de reconnaissance uniquement si ladite au moins une partie de ladite perturbation correspond ou satisfait audit au moins un critère de décision.  The electronic device on the ground compares at least part of said disturbance or variation with at least one stored decision criterion and generates a recognition signal only if said at least part of said perturbation corresponds to or satisfies said at least one decision criterion. .
Sous l ' effet dudit signal de reconnaissance, le dispositif électronique au sol autorise et synchronise des échanges de données entre les circuits d' émission/réception de signaux du dispositif électronique embarqué et du dispositif électronique au sol, par l' intermédiaire de ladite antenne embarquée et de ladite antenne fixe pendant qu' elles sont couplées entre elles.  Under the effect of said recognition signal, the electronic ground device authorizes and synchronizes data exchanges between the signal transmission / reception circuits of the on-board electronic device and the electronic device on the ground, via said on-board antenna. and said fixed antenna while coupled together.
Ainsi, les échanges de données sont autorisés et synchronisés entre le dispositif électronique au sol et le véhicule effectivement reconnu ou identifié et avec une connaissance réelle de sa position.  Thus, the data exchanges are authorized and synchronized between the electronic device on the ground and the vehicle actually recognized or identified and with a real knowledge of its position.
Selon une variante de réalisation, ladite antenne fixe peut comprendre une antenne-boucle métallique qui est reliée au dispositif électronique au sol et alimentée par ce dernier de façon à générer un champ magnétique pouvant être perturbé lors du passage du véhicule et dans lequel le dispositif électronique au sol détecte la perturbation ou variation du champ magnétique généré par ladite antenne-boucle, induite lors du passage d 'un véhicule.  According to an alternative embodiment, said fixed antenna may comprise an antenna-metal loop which is connected to the electronic device on the ground and fed by the latter so as to generate a magnetic field which can be disturbed during the passage of the vehicle and in which the electronic device on the ground detects the disturbance or variation of the magnetic field generated by said loop antenna, induced during the passage of a vehicle.
La détection de la perturbation ou variation du champ magnétique peut être réalisée par détection de la variation de l' inductance de l ' antenne-boucle métallique.  The detection of the disturbance or variation of the magnetic field can be achieved by detecting the variation of the inductance of the antenna-metal loop.
Selon une autre variante de réalisation, l ' antenne fixe peut comprendre un capteur magnétique à effet Hall ou magnétorésistif, le dispositif électronique au sol détectant la perturbation ou variation d'un signal délivré par ce capteur, induite lors du passage d'un véhicule. According to another variant embodiment, the fixed antenna may comprise a magnetic sensor with Hall effect or magnetoresistive, the electronic device on the ground detecting the disturbance or variation a signal delivered by this sensor, induced during the passage of a vehicle.
Ledit critère de décision peut comprendre un gabarit présentant au moins une valeur maximum et au moins une valeur minimum correspondant à des perturbations ou variations maximum et minimum du champ magnétique.  Said decision criterion may comprise a template having at least one maximum value and at least one minimum value corresponding to maximum and minimum disturbances or variations of the magnetic field.
La détection de la perturbation ou variation du champ magnétique peut être réalisée par échantillonnage.  Detection of the disturbance or variation of the magnetic field can be performed by sampling.
Les circuits d' émission/réception de signaux du véhicule et du dispositif électronique au sol peuvent comprendre des antennes radio fréquences par l ' intermédiaire desquelles sont réalisés lesdits échanges de données .  The signal transmission / reception circuits of the vehicle and the electronic ground device may comprise radio frequency antennas through which said data exchanges are carried out.
Il est également proposé un dispositif de transmission de données entre un véhicule équipé d'un dispositif électronique embarqué comprenant un circuit d ' émission/réception de signaux muni d' au moins une antenne embarquée et un dispositif électronique au so l comprenant un circuit d ' émission/réception de signaux, le véhicule pouvant se déplaçant sur un parcours équipé en un endroit d' au moins une antenne fixe.  There is also provided a device for transmitting data between a vehicle equipped with an on - board electronic device comprising a signal transmission / reception circuit equipped with at least one on - board antenna and an electronic device with a circuit comprising: transmission / reception of signals, the vehicle being able to move on an equipped route at a location of at least one fixed antenna.
Le dispositif électronique au so l peut comprendre un moyen de détection d'une perturbation ou variation d'un champ magnétique auquel est sensible ladite antenne fixe, induite lors du passage d 'un véhicule dans le voisinage de cette antenne fixe, un circuit de détection pour détecter la perturbation ou variation du champ magnétique de l ' antenne-boucle métallique induite lors du déplacement d'un véhicule.  The in-line electronic device may comprise means for detecting a disturbance or variation of a magnetic field to which said fixed antenna, sensed during the passage of a vehicle in the vicinity of this fixed antenna, is sensed, a detection circuit for detecting the disturbance or variation of the magnetic field of the antenna - metal loop induced during the movement of a vehicle.
Le dispositif électronique au so l peut comprendre un circuit de comparaison pour comparer au moins une partie de ladite perturbation ou variation à au moins un critère de décision mémorisé dans un circuit de mémorisation et pour générer un signal de reconnaissance uniquement si ladite au moins une partie de ladite perturbation correspond ou satisfait audit au moins un critère de décision.  The electronic device may comprise a comparison circuit for comparing at least a portion of said perturbation or variation with at least one decision criterion stored in a storage circuit and for generating a recognition signal only if said at least one part said perturbation corresponds or satisfies said at least one decision criterion.
Le dispositif électronique au sol peut comprendre des moyens pour autoriser et synchroniser, sous l' effet dudit signal de reconnaissance, des échanges de données entre les circuits d' émission/réception de signaux du dispositif électronique embarqué et du dispositif électronique au sol par l ' intermédiaire de ladite antenne embarquée et de ladite antenne fixe pendant qu ' elles sont couplées entre elles . The electronic ground device may comprise means for authorizing and synchronizing, under the effect of said signal of recognition, of data exchanges between the signal transmission / reception circuits of the on - board electronic device and the electronic device on the ground via said on - board antenna and said fixed antenna while they are coupled together.
L ' antenne fixe peut comprendre une antenne-boucle reliée à un générateur de courant.  The fixed antenna may include a loop antenna connected to a current generator.
Le circuit d ' émission/réception de signaux du dispositif électronique au sol peut être relié à l ' antenne-boucle et peut comprendre des moyens pour que le générateur de courant et le circuit d' émission/réception de signaux du dispositif électronique au so l ne soient pas connectés en même temps à l ' antenne-boucle.  The signal transmitting / receiving circuit of the electronic ground device may be connected to the loop antenna and may include means for the current generator and the signal transmitting / receiving circuit of the electronic device to operate. are not connected to the loop antenna at the same time.
L ' antenne fixe peut comprendre un capteur magnétique à effet Hall ou magnétorésistif.  The fixed antenna may include a magnetic Hall or magnetoresistive sensor.
Le dispositif électronique au sol et le dispositif embarqué peuvent comprendre des antennes radioélectriques reliées aux circuits d' émission/réception de signaux respectifs.  The electronic ground device and the onboard device may include radio antennas connected to the respective signal transmission / reception circuits.
Le dispositif électronique au sol et le dispositif électronique embarqué peuvent comprendre des moyens de mémorisation de données à transmettre.  The electronic device on the ground and the on-board electronic device may include means for storing data to be transmitted.
Des dispositifs de transmission de données entre un véhicule et un dispositif au so l vont maintenant être décrits à titre d' exemples non limitatifs, illustrés par le dessin sur lequel :  Data transmission devices between a vehicle and a device will now be described as nonlimiting examples, illustrated by the drawing in which:
- la figure 1 représente schématiquement un équipement au so l et un véhicule ;  - Figure 1 schematically shows a so-l equipment and a vehicle;
- la figure 2 représente un schéma d'un dispositif électronique dudit équipement au sol ;  - Figure 2 shows a diagram of an electronic device of said equipment on the ground;
- la figure 3 représente un schéma d'un dispositif électronique embarqué équipant ledit véhicule ;  FIG. 3 represents a diagram of an onboard electronic device equipping said vehicle;
- les figures 4a à 4e représentent des diagrammes de fonctionnement du dispositif électronique et du dispositif électronique embarqué ;  FIGS. 4a to 4e show operating diagrams of the electronic device and the on-board electronic device;
- la figure 5 représente une courbe de la signature magnétique d'un véhicule et d'un mode d' échantillonnage ; - la figure 6 représente une courbe de la signature magnétique d'un autre véhicule et d'un autre mode d' échantillonnage ; - Figure 5 shows a curve of the magnetic signature of a vehicle and a sampling mode; - Figure 6 shows a curve of the magnetic signature of another vehicle and another sampling mode;
- la figure 7 représente une variante de réalisation de l ' équipement de la figure 1 ; et  - Figure 7 shows an alternative embodiment of the equipment of Figure 1; and
- la figure 8 représente un autre dispositif électronique d'un équipement au sol.  - Figure 8 shows another electronic device of a ground equipment.
Comme illustré sur la figure 1 , un véhicule particulier ou attendu 1 peut être amené à circuler sur un parcours spécifique 2. Comme représenté sur cette figure, le véhicule 1 peut être un tramway ou un train pouvant circuler sur un parcours spécifique 2 déterminé par des rails 3 et 4. Selon un autre exemple, le véhicule 1 pourrait être un bus pouvant circuler sur un parcours spécifique 2 délimité latéralement.  As illustrated in FIG. 1, a particular or expected vehicle 1 can be driven on a specific path 2. As shown in this figure, the vehicle 1 can be a tramway or a train that can run on a specific path 2 determined by rails 3 and 4. In another example, the vehicle 1 could be a bus that can travel on a specific path 2 delimited laterally.
A un endroit particulier, selon un exemple de réalisation, le parcours spécifique 2 est équipé d'une antenne fixe formée spécifiquement par une antenne-boucle ou bobine métallique 5 située sur le so l ou enfouie à faible profondeur et placée entre les rails 3 et 4 de façon que le véhicule 1 puisse passer au-dessus . Cette antenne- boucle au so l 5 comprend une ou plusieurs spires, par exemple enroulées sous la forme d'un rectangle de façon à présenter deux branches longitudinales 5 a et 5b approximativement parallèles aux rails 3 et 4 et deux branches approximativement transversales 5 c et 5 d.  At a particular location, according to an exemplary embodiment, the specific path 2 is equipped with a fixed antenna formed specifically by an antenna-loop or metal coil 5 located on the ground or buried at shallow depth and placed between the rails 3 and 4 so that the vehicle 1 can pass over. This loop loop antenna comprises one or more turns, for example wound in the form of a rectangle so as to have two longitudinal branches 5a and 5b approximately parallel to the rails 3 and 4 and two branches approximately transverse 5c and 5 d.
Les extrémités de l ' antenne-boucle au so l 5 sont reliées par des fils de connexion électrique 6 et 7 qui passent sous un rail et qui rejoignent un dispositif électronique 8 au sol, logé par exemple dans une armoire située à proximité du parcours spécifique 2.  The ends of the ground loop antenna 5 are connected by electrical connection wires 6 and 7 which pass under a rail and which join an electronic device 8 on the ground, housed for example in a cabinet located close to the specific path. 2.
Comme illustré sur la figure 2, le dispositif électronique au so l 8 comprend un générateur de courant 9 relié aux fils électriques 6 et 7 de manière à alimenter l ' antenne-boucle au sol 5 en un courant modulé, par exemple alternatif, de telle sorte que l ' antenne-boucle au so l 5 génère dans son environnement un champ magnétique souhaité tel que ce champ magnétique puisse être perturbé ou modifié par les organes métalliques du véhicule 1 lors du passage de ce dernier au- dessus de l ' antenne-boucle au so l 5. Détecter et caractériser par rapport à un ou plusieurs critères spécifiques de décision, lors du passage du véhicule particulier 1 au- dessus de l ' antenne-boucle au so l 5 , la perturbation ou la variation du champ magnétique spécifique généré par l ' antenne-boucle au sol 5 , permet d' identifier ce véhicule particulier 1 grâce à la reconnaissance de sa signature magnétique. As illustrated in FIG. 2, the electronic device 8 comprises a current generator 9 connected to the electrical wires 6 and 7 so as to feed the ground loop antenna 5 into a modulated current, for example an alternating current of such so that the antenna-loop in so 5 generates in its environment a desired magnetic field such that this magnetic field can be disturbed or modified by the metal members of the vehicle 1 during the passage of the latter above the antenna- Loop at 5. Detecting and characterizing, with respect to one or more specific decision criteria, during the passage of the particular vehicle 1 above the loop antenna to the ground 5, the disturbance or the variation of the specific magnetic field generated by the antenna. ground loop 5, makes it possible to identify this particular vehicle 1 thanks to the recognition of its magnetic signature.
Pour cela, selon un exemple de réalisation, le dispositif électronique au sol 8 comprend en outre un circuit 10 de détection de la variation de l ' inductance de l ' antenne-boucle au so l 5 , par exemple relié aux fils électriques 6 et 7 ou aux connexions de ces derniers .  For this, according to an exemplary embodiment, the ground electronic device 8 further comprises a circuit 10 for detecting the variation of the inductance of the loop antenna at the ground 5, for example connected to the electric wires 6 and 7. or to the connections of these.
Le dispositif électronique au sol 8 comprend également un circuit de mémoires 1 1 dans lequel sont stockés, préalablement, des critères spécifiques de décision correspondant au véhicule particulier ou attendu 1 .  The electronic ground device 8 also comprises a memory circuit 11 in which are previously stored specific decision criteria corresponding to the particular vehicle or expected 1.
Le dispositif électronique au sol 8 comprend également un circuit de comparaison 12, apte à comparer les signaux délivrés par le circuit de détection 10 et les critères de décision stockés dans le circuit de mémoires 1 1 et apte à délivrer sur une sortie un signal S i particulier d'identification du véhicule particulier attendu 1 si ladite perturbation correspond ou satisfait le ou les critères spécifiques de décision mémorisés associés à ce véhicule particulier ou attendu 1 .  The electronic device on the ground 8 also comprises a comparison circuit 12, able to compare the signals delivered by the detection circuit 10 and the decision criteria stored in the memory circuit 11 and able to deliver on an output a signal S i particular identification of the particular vehicle expected 1 if said disturbance corresponds or meets the specific decision criteria or stored stored associated with this particular vehicle or expected 1.
Selon un exemple de réalisation, le circuit de détection 10 et le circuit de comparaison 12, associés au circuit de mémoires 1 1 , sont adaptés pour réaliser la détection et la comparaison par échantillonnage, selon des phases successives, par exemple en comparant les valeurs successives des variations de l ' inductance à des couples de valeurs maximum et minimum mémorisées, formant un gabarit, correspondant aux effets du véhicule 1 sur le champ magnétique au fur et à mesure de son avancée au-dessus de l ' antenne- boucle au so l 5.  According to an exemplary embodiment, the detection circuit 10 and the comparison circuit 12, associated with the memory circuit 1 1, are adapted to carry out the detection and the comparison by sampling, according to successive phases, for example by comparing the successive values variations of the inductance at stored maximum and minimum pairs of values, forming a template, corresponding to the effects of the vehicle 1 on the magnetic field as it advances over the loop antenna to the ground. 5.
Généralement, un véhicule attendu 1 peut être identifié en détectant la première partie de sa signature magnétique totale, c'est-à- dire en détectant la première partie de la variation de l' inductance de l ' antenne-boucle au so l 5 au fur et à mesure de l ' avancée du véhicule, correspondant à la perturbation du champ magnétique de l ' antenne- boucle au so l 5. Generally, an expected vehicle 1 can be identified by detecting the first part of its total magnetic signature, ie by detecting the first part of the variation of the inductance of the loop antenna in so as the vehicle progresses, corresponding to the disturbance of the magnetic field of the loop antenna in the earth.
Le dispositif électronique au sol 8 comprend en outre un circuit électronique 1 3 de gestion et de mémorisation de données, relié à un dispositif d' émission/réception 14 de signaux.  The electronic ground device 8 further comprises an electronic circuit 1 3 for managing and storing data, connected to a device for transmitting / receiving signals 14.
Le circuit électronique 13 de gestion et de mémorisation de données présente une entrée reliée à la sortie du circuit de comparaison 12 de façon à être soumis au signal d' identification Si.  The electronic data management and storage circuit 13 has an input connected to the output of the comparison circuit 12 so as to be subjected to the identification signal Si.
Le dispositif d ' émission/réception de signaux 14 est relié aux fils de connexion 6 et 7 de l ' antenne-boucle au so l 5 ou à leurs connexions électriques par l ' intermédiaire de fils de connexion électriques 14a et 14b.  The signal transmitting / receiving device 14 is connected to the connection wires 6 and 7 of the loop antenna at the ground 5 or to their electrical connections via electrical connection wires 14a and 14b.
De son côté, comme illustré sur la figure 3 , le véhicule 1 est équipé d'un dispositif électronique embarqué 15 qui comprend un circuit électronique 16 de gestion et de mémorisation de données relié à un circuit d ' émission/réception de signaux 17 relié à une antenne 1 8. Cette antenne 1 8 est par exemple localisée sous le véhicule 1 de façon à pouvoir être couplée à l ' antenne-boucle au so l 5 lorsqu' elles sont à proximité l 'une de l ' autre.  For its part, as illustrated in FIG. 3, the vehicle 1 is equipped with an on-board electronic device 15 which comprises an electronic circuit 16 for managing and storing data connected to a signal transmission / reception circuit 17 connected to An antenna 1 8. This antenna 1 8 is for example located under the vehicle 1 so as to be coupled to the antenna-loop in so 5 when they are close to one another.
On va maintenant décrire un mode de fonctionnement de l ' équipement décrit ci-dessus, en référence aux figures 4a-e sur lesquelles, en correspondance :  We will now describe a mode of operation of the equipment described above, with reference to FIGS. 4a-e to which, in correspondence:
- la figure 4a illustre un diagramme de fonctionnement du générateur de courant 9,  FIG. 4a illustrates an operating diagram of the current generator 9,
- la figure 4b illustre un diagramme de fonctionnement du circuit de détection 10,  FIG. 4b illustrates an operating diagram of the detection circuit 10,
- la figure 4c illustre un diagramme de fonctionnement du circuit de comparaison 12,  FIG. 4c illustrates an operating diagram of the comparison circuit 12,
- la figure 4d illustre un diagramme de fonctionnement du circuit d ' émission/réception 14, et  FIG. 4d illustrates an operating diagram of the transmission / reception circuit 14, and
- la figure 4e illustre un diagramme de fonctionnement du dispositif électronique embarqué 15.  FIG. 4e illustrates an operating diagram of the on-board electronic device 15.
Avant qu'un véhicule ne soit sur l ' antenne-boucle 5 , la situation est la suivante. Le générateur de courant 9 est à l'état connecté 100 à l'antenne-boucle au sol 5 et alimente cette dernière et le circuit de détection 10 est à l'état connecté 101 à l'antenne-boucle au sol 5. Par exemple, des interrupteurs électroniques 100a et 100b prévus à cet effet sont à l'état « fermé ». Before a vehicle is on the loop antenna 5, the situation is as follows. The current generator 9 is in the connected state 100 to the ground loop antenna 5 and feeds the latter and the detection circuit 10 is in the connected state 101 to the ground loop antenna 5. For example , electronic switches 100a and 100b provided for this purpose are in the "closed" state.
Le circuit d'émission/réception de signaux 14 est à l'état déconnecté 102 de l'antenne-boucle au sol 5. Par exemple, des interrupteurs électroniques 102a et 102b prévus à cet effet sont à l'état « ouvert ».  The signal transmission / reception circuit 14 is in the disconnected state 102 of the ground loop antenna 5. For example, the electronic switches 102a and 102b provided for this purpose are in the "open" state.
Le dispositif électronique embarqué 15 est à l'état de The on-board electronic device 15 is in the state of
« veille », ne maintenant active que la fonction réception ou « veille» de son antenne 18 reliée au circuit d'émission/réception 17. "Standby", now only activates the reception or "standby" function of its antenna 18 connected to the transmission / reception circuit 17.
Lorsqu'un véhicule attendu 1 s'engage au-dessus de l'antenne- boucle au sol 5, le circuit de comparaison 12 en liaison avec le circuit de détection 10 et le circuit de mémoires 11 engage et exécute une phase de reconnaissance magnétique 103.  When an awaited vehicle 1 engages over the antenna-ground loop 5, the comparison circuit 12 in connection with the detection circuit 10 and the memory circuit 11 engages and executes a magnetic recognition phase 103 .
Le véhicule particulier attendu 1 étant reconnu, à la fin de la phase de reconnaissance magnétique 103, le circuit de comparaison 12 délivre un signal de reconnaissance Sr.  The expected particular vehicle 1 being recognized, at the end of the magnetic recognition phase 103, the comparison circuit 12 delivers a recognition signal Sr.
D'une part, à la réception du signal de reconnaissance Sr, le générateur de courant 9 passe à l'état déconnecté de l'antenne-boucle au sol 5 et n'alimente plus cette dernière. Le générateur de courant 9 démarre alors une phase 104 d'absence d'alimentation de l'antenne- boucle au sol 5. Egalement, le circuit de détection 10 passe à l'état déconnecté de l'antenne-boucle au sol 5 et démarre alors une phase de déconnection 105. A cet effet, les interrupteurs 100a et 100b passent à l'état « ouvert »  On the one hand, on receiving the recognition signal Sr, the current generator 9 goes off-line from the ground loop antenna 5 and no longer supplies the latter. The current generator 9 then starts a phase 104 of no power supply of the ground loop antenna 5. Also, the detection circuit 10 goes off-line from the ground loop antenna 5 and starts then a disconnection phase 105. For this purpose, the switches 100a and 100b go to the "open" state
D'autre part, à la réception du signal d'identification Sr, éventuellement après un délai de sécurité, le circuit d'émission/réception de signaux 14 passe à l'état connecté à l'antenne-boucle au sol 5 et démarre une phase de connexion 106. A cet effet, les interrupteurs 102a et 102b passent à l'état « fermé ».  On the other hand, upon receipt of the identification signal Sr, possibly after a security delay, the signal transmission / reception circuit 14 goes to the state connected to the ground loop antenna 5 and starts a connection phase 106. For this purpose, the switches 102a and 102b go to the "closed" state.
Le véhicule attendu 1 étant encore dans une zone dans laquelle l'antenne-boucle au sol 5 et l'antenne 18 du dispositif électronique embarqué 15 sont couplées par voie radioélectrique, des échanges de signaux sont possibles entre elles. The expected vehicle 1 being still in an area in which the ground loop antenna 5 and the antenna 18 of the electronic device embedded 15 are coupled by radio, exchanges of signals are possible between them.
Le circuit électronique 13 de gestion et de mémorisation de données du dispositif électronique au sol 8 transmet un premier signal 107 d'activation et de synchronisation au circuit électronique 16 de gestion et de mémorisation de données du dispositif électronique embarqué 15, par l'intermédiaire du circuit d'émission/réception de signaux 14, de l'antenne-boucle au sol 5, de l'antenne 18 et du circuit d'émission/réception de signaux 17.  The electronic circuit 13 for managing and storing data of the electronic ground device 8 transmits a first activation and synchronization signal 107 to the electronic data management and storage circuit 16 of the on-board electronic device 15 via the signal transmission / reception circuit 14, the ground loop antenna 5, the antenna 18 and the signal transmission / reception circuit 17.
A la réception de ce premier signal 100 d'activation et de synchronisation, le circuit électronique 16 de gestion et de mémorisation de données du dispositif électronique embarqué 15 passe de l'état de « veille » à l'état « actif », c'est-à-dire qu'il démarre une phase 108 au cours de laquelle il est apte à émettre et recevoir des signaux par son antenne 18.  On receipt of this first activation and synchronization signal 100, the electronic data management and storage circuit 16 of the on-board electronic device 15 changes from the "standby" state to the "active" state. that is to say, it starts a phase 108 during which it is able to transmit and receive signals by its antenna 18.
Puis, le circuit électronique 13 de gestion et de mémorisation de données du dispositif électronique au sol 8 et le circuit électronique 16 de gestion et de mémorisation de données du dispositif électronique embarqué 15, synchronisés, échangent les données prévues par programmation préalable, selon un protocole pré-établi, par l'intermédiaire de leurs antennes 5 et 18.  Then, the electronic circuit 13 for managing and storing data of the electronic device on the ground 8 and the electronic circuit 16 for managing and storing data of the on-board electronic device 15, synchronized, exchange the data provided by prior programming, according to a protocol pre-established, through their antennas 5 and 18.
Après les phases correspondantes 106 et 107 d'échanges de données, le fonctionnement est le suivant.  After the corresponding phases 106 and 107 of data exchange, the operation is as follows.
D'une part, en ce qui concerne le dispositif électronique au sol 8, le dispositif d'émission/réception de signaux 10 est placé à l'état connecté à l'antenne-boucle 5, la phase de connexion 106 se terminant. En outre, éventuellement après un délai de sécurité, le circuit de détection 10 est placé à l'état connecté à l'antenne-boucle au sol 5, la phase de déconnexion 105 se terminant, et le générateur de courant 9 est placé à l'état connecté, la phase de déconnection 104 se terminant. A cet effet, les interrupteurs 100a et 100b passent à l'état « fermé » et les interrupteurs 102a et 102b passent à l'état « ouvert » D ' autre part, le dispositif électronique embarqué 1 5 se place à l ' état de « veille », ne maintenant que la fonction « écoute » et stoppant la fonction « émission ». On the one hand, with regard to the electronic device on the ground 8, the signal transmission / reception device 10 is placed in the state connected to the loop antenna 5, the connection phase 106 ending. In addition, possibly after a delay of safety, the detection circuit 10 is placed in the connected state to the ground loop antenna 5, the disconnection phase 105 ending, and the current generator 9 is placed at the state connected, the disconnection phase 104 ending. For this purpose, the switches 100a and 100b go to the "closed" state and the switches 102a and 102b go to the "open" state. On the other hand, the onboard electronic device 1 5 is placed in the state of "standby", now only the function "listens" and stopping the "transmission" function.
L ' équipement est alors dans l ' attente d'un véhicule attendu 1 suivant sur le parcours 2.  The equipment is then waiting for a vehicle expected 1 following on the route 2.
Comme illustré sur la figure 5 , une première partie 200 d 'une courbe de signature magnétique C l , représentée par une variation de la valeur de l ' inductance de l ' antenne-boucle au sol 5 lors du passage d'un véhicule attendu 1 , comprend une partie montante 201 , suivie d'une partie 202 en forme de sommet irrégulier, suivie d'une partie descendante 203. Cette première partie 200 correspond au passage de la partie avant d 'un véhicule particulier attendu tel qu'un tramway ou un train, équipée d'un boggie avant . La courbe de signature magnétique ÇJ_ dépend, en abscisse, de la vitesse du véhicule attendu 1 et peut être considérée comme valable pour une plage de vitesses habituelles.  As illustrated in FIG. 5, a first portion 200 of a magnetic signature curve C 1, represented by a variation of the value of the inductance of the ground loop antenna 5 during the passage of an expected vehicle 1 , comprises a rising portion 201, followed by an irregular top-shaped portion 202, followed by a descending portion 203. This first portion 200 corresponds to the passage of the front part of an expected particular vehicle such as a tram or a train, equipped with a front bogie. The magnetic signature curve J depends on the abscissa of the expected vehicle speed 1 and can be considered as valid for a range of usual speeds.
La première partie 201 est suivie d'une seconde partie 204 située à un niveau inférieur à la partie de sommet 202 et correspond au passage du plancher d'un tel véhicule attendu 1 . Cette seconde partie 204 est suivie d'une troisième partie 205 approximativement symétrique de la première partie 200, présentant un sommet et correspondant au passage d'un boggie arrière du véhicule .  The first portion 201 is followed by a second portion 204 located at a level below the crown portion 202 and corresponds to the passage of the floor of such an expected vehicle 1. This second portion 204 is followed by a third portion 205 approximately symmetrical with the first portion 200, having an apex and corresponding to the passage of a rear bogie of the vehicle.
Comme indiqué précédemment, pour reconnaître ou identifier un véhicule attendu présentant une courbe de signature magnétique C l , on enregistre dans le circuit de mémoires 1 1 , à titre de critères, une courbe Cmin de points de valeurs minimum et une courbe Cmax de points de valeurs maximum enveloppant au moins la partie supérieure de la première partie 201 de la courbe de signature magnétique C 1 .  As previously indicated, in order to recognize or identify an expected vehicle having a magnetic signature curve C l, a minimum value point curve Cmin and a curve Cmax of points are recorded in the memory circuit 11 as criteria. maximum values enveloping at least the upper part of the first part 201 of the magnetic signature curve C 1.
Le circuit de comparaison 12 est alors chargé, lors de la phase de détection 103 , de délivrer le signal de reconnaissance Sx uniquement si les valeurs issues du circuit de détection 10 , obtenues par échantillonnage par segmentation, au fur et à mesure de l ' avancée d'un véhicule au-dessus de l ' antenne-boucle au so l 5 sont situées entre les valeurs correspondantes des courbes Cmax et Cmin. Ce véhicule étant un véhicule attendu 1 , les phases d' échanges de données 106 et 107 sont alors autorisées . The comparison circuit 12 is then loaded, during the detection phase 103, to deliver the recognition signal Sx only if the values from the detection circuit 10, obtained by segmentation sampling, as the progress is made. of a vehicle above the ground loop antenna are located between the corresponding values of the curves Cmax and Cmin. This vehicle being an expected vehicle 1, the data exchange phases 106 and 107 are then authorized.
Dans tous les autres cas, le véhicule qui passe au-dessus de l ' antenne-boucle au sol 5 n' est pas un véhicule attendu 1 et le signal de reconnaissance Sr n' est pas délivré.  In all other cases, the vehicle passing over the ground loop antenna 5 is not an expected vehicle 1 and the recognition signal Sr is not delivered.
Comme illustré sur la figure 6, une courbe de signature magnétique Ç_2_, représentant une variation de la valeur de l 'inductance de l ' antenne-boucle au sol 5 lors du passage d'un autre véhicule attendu 1 , comprend, après une partie montante 300, une partie 300 quasiment constante. Cette partie quasiment constante 300 correspond au passage d'un autre véhicule attendu 1 tel qu'un bus, dont la composition métallique inférieure est quasiment constante sur toute sa longueur.  As illustrated in FIG. 6, a magnetic signature curve C_2_, representing a variation of the value of the inductance of the antenna-ground loop 5 during the passage of another expected vehicle 1, comprises, after a rising portion 300, a 300 part almost constant. This almost constant portion 300 corresponds to the passage of another expected vehicle 1 such as a bus, whose lower metal composition is almost constant over its entire length.
Dans ce cas, on enregistre dans le circuit de mémo ires 1 1 , à titre de critères, une valeur Vmin et une valeur Vmax situées respectivement au-dessous et au-dessus de la valeur de la partie quasiment constante 300 de la courbe de signature magnétique C2.  In this case, a value Vmin and a value Vmax located respectively below and above the value of the almost constant portion 300 of the signature curve are recorded in the memory circuit 1 1 as criteria. magnetic C2.
Le circuit de comparaison 12 est alors chargé, lors de la phase de détection 103 , de délivrer le signal de reconnaissance Sx uniquement si les valeurs issues du circuit de détection 10 , obtenues par échantillonnage, au fur et à mesure de l ' avancée d'un véhicule au- dessus de l ' antenne-boucle au so l 5 , sont situées entre les valeurs Vmax et Vmin, ce au terme d 'une première partie de la partie quasiment constante 301 de la courbe C2. Ce véhicule étant un véhicule attendu 1 , les phases d' échanges de données 106 et 107 sont alors autorisées .  The comparison circuit 12 is then loaded, during the detection phase 103, to deliver the recognition signal Sx only if the values from the detection circuit 10, obtained by sampling, as the progress of A vehicle above the loop antenna at the ground 5 is located between the values Vmax and Vmin at the end of a first portion of the substantially constant portion 301 of the curve C2. As this vehicle is an expected vehicle 1, the data exchange phases 106 and 107 are then authorized.
Dans tous les autres cas, le véhicule qui passe au-dessus de l ' antenne-boucle au sol 5 n' est pas un véhicule attendu 1 et le signal de reconnaissance Sr n' est pas délivré.  In all other cases, the vehicle passing over the ground loop antenna 5 is not an expected vehicle 1 and the recognition signal Sr is not delivered.
Avantageusement, on peut enregistrer dans le circuit de mémoires 1 1 , d'une part la courbe Cmin de points de valeurs minimum et la courbe Cmax de points de valeurs maximum et d' autre part les valeurs Vmax et Vmin, formant des critères de reconnaissance respectivement associés à un premier véhicule attendu et à un second véhicule attendu, présentant des signatures magnétiques différentes correspondantes. Advantageously, it is possible to record in the memory circuit 1 1, on the one hand, the curve Cmin of points of minimum values and the curve Cmax of points of maximum values and, on the other hand, the values Vmax and Vmin, forming recognition criteria. respectively associated with an expected first vehicle and a second expected vehicle, having corresponding different magnetic signatures.
Le circuit de comparaison 12 peut alors différencier les véhicules attendus correspondant respectivement à ces critères différents et délivrer des signaux Sr différenciés de telle sorte que le dispositif électronique au sol 8 et le dispositif électronique embarqué 15 échangent des données propres et différenciées attribuées à ces véhicules attendus différents, pendant les phases respectives 106 et 107.  The comparison circuit 12 can then differentiate the expected vehicles respectively corresponding to these different criteria and deliver differentiated Sr signals such that the ground electronic device 8 and the on-board electronic device 15 exchange clean and differentiated data attributed to these expected vehicles. different, during the respective phases 106 and 107.
Selon une variante de réalisation illustrée sur la figure 7, les connexions électriques 14a et 14b entre le circuit d ' émission/réception de signaux 14 du dispositif électronique au sol 8 et l ' antenne-boucle 5 peuvent être supprimés et ce circuit d ' émission/réception de signaux 14 peut être relié à une antenne 19.  According to an alternative embodiment illustrated in FIG. 7, the electrical connections 14a and 14b between the signal transmission / reception circuit 14 of the electronic ground device 8 and the loop antenna 5 can be suppressed and this transmission circuit / receiving signals 14 can be connected to an antenna 19.
Dans ce cas, les échanges précités de données lors des phases In this case, the aforementioned exchanges of data during the phases
106 et 1 07 peuvent être réalisés par voie radioélectrique entre cette antenne 19 et l ' antenne 1 8 du dispositif embarqué 15. En outre, le générateur de courant 9 et le circuit de détection 10 peuvent directement être reliés à l ' antenne-boucle 5 et rester connectés à cette dernière. 106 and 1 07 can be realized by radio between this antenna 19 and the antenna 1 8 of the onboard device 15. In addition, the current generator 9 and the detection circuit 10 can be directly connected to the loop antenna 5 and stay connected to it.
Il résulte de ce qui précède que grâce à la reconnaissance magnétique du véhicule attendu, donnant naissance au signal Sr, le véhicule attendu est placé dans une position particulièrement favorable pour obtenir une synchronisation précise des échanges de données entre le dispositif au so l 8 et le dispositif embarqué 15. En outre, le risque d' échanges de données avec d ' autres dispositifs placés dans le voisinage ainsi que le risque de brouillages sont réduits. De plus, ne faire fonctionner les circuits d' émission/réception 14 et 17 en mode « émission » que si nécessaire et sur une durée limitée procure les mêmes avantages.  It follows from the foregoing that by virtue of the magnetic recognition of the expected vehicle giving rise to the signal Sr, the expected vehicle is placed in a particularly favorable position to obtain precise synchronization of the data exchanges between the device 8 and In addition, the risk of data exchange with other devices in the vicinity and the risk of interference are reduced. In addition, operating the transmit / receive circuits 14 and 17 in "transmit" mode only if necessary and for a limited time provides the same advantages.
A titre d ' exemple, une réalisation peut présenter les dispositions suivantes.  By way of example, an embodiment may have the following provisions.
Le fil de l ' antenne-boucle 5 peut présenter un diamètre compris entre un cinquième de millimètre et deux millimètres et le nombre de spires de l ' antenne-boucle 5 peut être compris entre un et vingt. La distance entre les branches longitudinales 5 a et 5b de l ' antenne-boucle 5 peut être comprise entre vingt centimètres et cinq mètres et la longueur de cette antenne-boucle 5 peut être comprise entre vingt centimètres et douze mètres. The antenna-loop wire 5 may have a diameter of between one-fifth of a millimeter and two millimeters and the number of turns of the loop antenna 5 can be between one and twenty. The distance between the longitudinal branches 5a and 5b of the loop antenna 5 may be between twenty centimeters and five meters and the length of this loop antenna 5 may be between twenty centimeters and twelve meters.
L ' intensité du courant délivré par le générateur de courant 9 peut être comprise entre un et cent milliampères. Pour un véhicule attendu 1 circulant à environ dix mètres par secondes, il peut être suffisant de prévoir environ quinze échantillons, chacun d 'une durée égale à environ quinze millisecondes et selon un rythme de vingt cinq millisecondes, pour réaliser la reconnaissance d'un véhicule attendu 1 .  The intensity of the current delivered by the current generator 9 may be between one and one hundred milliamps. For an expected vehicle 1 traveling at about ten meters per second, it may be sufficient to provide about fifteen samples, each of a duration equal to about fifteen milliseconds and at a rate of twenty five milliseconds, to achieve recognition of a vehicle expected 1.
Dans un cas, les échanges de données entre l ' antenne-boucle 5 et l ' antenne embarquée 1 8 peuvent par exemple être effectués par l' intermédiaire d'une porteuse à base fréquence modulée en fréquence, par exemple comprise entre 9 et 150 kiloHertz. Dans l ' autre cas, les échanges de données par voie radioélectrique entre et l' antenne embarquée 1 8 et l ' antenne 19 peuvent être effectués par l' intermédiaire d'une porteuse à haute fréquence modulée en fréquence, par exemple comprise entre quatre cents mégaHertz et cinq gigaHertz.  In one case, the data exchanges between the loop antenna 5 and the on-board antenna 1 8 may for example be carried out via a frequency-modulated frequency-based carrier, for example between 9 and 150 kilohertz. . In the other case, the radio data interchange between the on-board antenna 1 8 and the antenna 19 can be carried out via a frequency-modulated high-frequency carrier, for example between four hundred megaHertz and five gigabytes.
Selon un autre exemple de réalisation illustré sur la figure 8 , un dispositif électronique au sol 20 se différencie du dispositif électronique au sol 8 de l ' exemple de la figure 7 uniquement de la manière suivante.  According to another exemplary embodiment illustrated in FIG. 8, an electronic ground device 20 differs from the electronic ground device 8 of the example of FIG. 7 only in the following manner.
L ' antenne fixe formée par une antenne-boucle 5 est remplacée par une antenne formée spécifiquement par un capteur magnétique à effet Hall ou magnétorésistif (AM, GMR) 21 sensible au champ magnétique terrestre.  The fixed antenna formed by a loop antenna 5 is replaced by an antenna formed specifically by a magnetic sensor Hall effect or magnetoresistive (AM, GMR) 21 sensitive to the Earth's magnetic field.
Le générateur de courant 9 et le circuit de détection 10 sont remplacés par un circuit électronique 22 d ' alimentation du capteur 20, apte à délivrer au comparateur 12 les variations d'un signal issu du capteur 20 et correspondant à des perturbations ou variations du champ magnétique terrestre induites lors du passage d'un véhicule. Hormis les différences ci-dessus, le dispositif électronique au so l 20 fonctionne de façon équivalente au dispositif électronique au so l 8 de l ' exemp le précédent. The current generator 9 and the detection circuit 10 are replaced by an electronic circuit 22 for supplying the sensor 20, able to deliver to the comparator 12 the variations of a signal coming from the sensor 20 and corresponding to perturbations or variations of the field ground magnetic induced during the passage of a vehicle. Apart from the above differences, the electronic device in the same way operates in an equivalent manner to the electronic device in accordance with the above-mentioned example.
Selon une variante de réalisation, après que le signal de reconnaissance Sr ait été généré, les échanges de données entre l ' antenne-boucle 5 ayant servi à la détection magnétique et l ' antenne embarquée 1 8 peuvent être réduits à des échanges de signaux de synchronisation, par exemple le premier signal 107 d' activation et de synchronisation précité. Après quoi, les échanges souhaités de données entre le dispositif au so l et le dispositif embarqué peuvent être réalisés par l 'intermédiaire d ' antennes radio fréquences autres.  According to a variant embodiment, after the recognition signal Sr has been generated, the data exchanges between the loop antenna 5 used for the magnetic detection and the on-board antenna 1 8 can be reduced to exchanges of synchronization, for example the first activation and synchronization signal 107 mentioned above. After that, the desired data exchanges between the on-board device and the on-board device can be realized via other radio frequency antennas.
La présente invention ne se limite pas aux exemples décrits ci- dessus . Des variantes de réalisation peuvent être envisagées sans sortir du cadre de l 'invention.  The present invention is not limited to the examples described above. Alternative embodiments may be envisaged without departing from the scope of the invention.

Claims

REVENDICATIONS
1 . Procédé de transmission de données entre un véhicule équipé d'un dispositif électronique embarqué ( 15) comprenant un circuit d' émission/réception de signaux ( 17) muni d' au moins une antenne embarquée ( 1 8) et un dispositif électronique au sol (8) comprenant un circuit d' émission/réception de signaux ( 14), le véhicule pouvant se déplacer sur un parcours (2) équipé en un endroit d' au moins une antenne fixe (5 , 21 ), dans lequel : 1. A method of transmitting data between a vehicle equipped with an on - board electronic device (15) comprising a signal transmission / reception circuit (17) provided with at least one on - board antenna (1 8) and an electronic ground device ( 8) comprising a signal transmitting / receiving circuit (14), the vehicle being movable on a path (2) provided at a location of at least one fixed antenna (5, 21), wherein:
le dispositif électronique au sol (8) détecte une perturbation ou variation d'un champ magnétique auquel est sensible ladite antenne fixe, induite lors du passage d 'un véhicule dans le voisinage de cette antenne fixe,  the electronic ground device (8) detects a disturbance or variation of a magnetic field to which said fixed antenna is sensitive, induced during the passage of a vehicle in the vicinity of this fixed antenna,
le dispositif électronique au sol (8) compare au moins une partie de ladite perturbation ou variation à au moins un critère de décision mémorisé et génère un signal de reconnaissance uniquement si ladite au moins une partie de ladite perturbation correspond ou satisfait audit au moins un critère de décision,  the electronic ground device (8) compares at least a portion of said disturbance or variation with at least one stored decision criterion and generates a recognition signal only if said at least part of said disturbance corresponds to or satisfies said at least one criterion decision,
et, sous l ' effet dudit signal de reconnaissance, le dispositif électronique au so l (8) autorise et synchronise des échanges de données entre les circuits d' émission/réception de signaux du dispositif électronique embarqué et du dispositif électronique au sol, par l ' intermédiaire de ladite antenne embarquée et de ladite antenne fixe pendant qu' elles sont couplées entre elles.  and, under the effect of said recognizing signal, the electronic device in so l (8) authorizes and synchronizes data exchanges between the signal transmission / reception circuits of the on-board electronic device and the electronic device on the ground, by the intermediate of said onboard antenna and said fixed antenna while they are coupled together.
2. Procédé selon la revendication 1 , dans lequel ladite antenne fixe comprend une antenne-boucle métallique (5) qui est reliée au dispositif électronique au sol et alimentée par ce dernier de façon à générer un champ magnétique pouvant être perturbé lors du passage du véhicule et dans lequel le dispositif électronique au sol détecte la perturbation ou variation du champ magnétique généré par ladite antenne-boucle, induite lors du passage d'un véhicule.  2. Method according to claim 1, wherein said fixed antenna comprises an antenna-metal loop (5) which is connected to the electronic device on the ground and powered by the latter so as to generate a magnetic field which can be disturbed during the passage of the vehicle and wherein the electronic ground device detects the disturbance or variation of the magnetic field generated by said loop antenna, induced during the passage of a vehicle.
3. Procédé selon la revendication 2, dans lequel la détection de la perturbation ou variation du champ magnétique est réalisée par détection de la variation de l ' inductance de l ' antenne-boucle métallique. 3. Method according to claim 2, wherein the detection of the disturbance or variation of the magnetic field is carried out by detection of the variation of the inductance of the antenna - metal loop.
4. Procédé selon la revendication 1 , dans lequel l ' antenne fixe comprend un capteur magnétique à effet Hall ou magnétorésistif (2 1 ) et dans lequel le dispositif électronique au sol détecte la perturbation ou variation d'un signal délivré par ledit capteur, induite lors du passage d'un véhicule.  4. The method of claim 1, wherein the fixed antenna comprises a magnetic sensor Hall effect or magnetoresistive (2 1) and wherein the electronic device on the ground detects the disturbance or variation of a signal delivered by said sensor, induced when passing a vehicle.
5. Procédé selon l'une quelconque des revendications précédentes, dans lequel ledit critère de décision comprend un gabarit présentant au moins une valeur maximum et au moins une valeur minimum correspondant à des perturbations ou variations maximum et minimum du champ magnétique.  5. Method according to any one of the preceding claims, wherein said decision criterion comprises a template having at least one maximum value and at least one minimum value corresponding to maximum and minimum disturbances or variations of the magnetic field.
6. Procédé selon l'une quelconque des revendications précédentes, dans lequel la détection de la perturbation ou variation du champ magnétique est réalisée par échantillonnage.  6. Method according to any one of the preceding claims, wherein the detection of the disturbance or variation of the magnetic field is performed by sampling.
7. Procédé selon l'une quelconque des revendications précédentes, dans lequel les circuits d' émission/réception de signaux du véhicule et du dispositif électronique au sol comprennent des antennes radio fréquences ( 1 8 , 19) par l 'intermédiaire desquelles sont réalisés lesdits échanges de données .  A method as claimed in any one of the preceding claims, wherein the signal transmission / reception circuits of the vehicle and the ground electronic device comprise radio frequency antennas (118, 19) through which said radio frequency antennas (18, 19) are made. data exchange.
8. Dispositif de transmission de données entre un véhicule équipé d'un dispositif électronique embarqué ( 15) comprenant un circuit d' émission/réception de signaux ( 17) muni d'une antenne embarquée et un dispositif électronique au sol (8) comprenant un circuit d' émission/réception de signaux ( 14), le véhicule pouvant se déplacer sur un parcours équipé en un endroit d' au moins une antenne fixe (5 , 21 ),  8. Device for transmitting data between a vehicle equipped with an on-board electronic device (15) comprising a signal transmission / reception circuit (17) equipped with an on-board antenna and an electronic ground device (8) comprising a signal transmitting / receiving circuit (14), the vehicle being able to move on an equipped course at a location of at least one fixed antenna (5, 21),
dans lequel le dispositif électronique au sol (8) comprend un moyen de détection ( 10, 22) d'une perturbation ou variation d'un champ magnétique auquel est sensible ladite antenne fixe, induite lors du passage d'un véhicule dans le voisinage de cette antenne fixe, un circuit de détection ( 10) pour détecter la perturbation ou variation du champ magnétique de l ' antenne-boucle métallique induite lors du déplacement d 'un véhicule, un circuit de comparaison ( 12) pour comparer au moins une partie de ladite perturbation ou variation à au moins un critère de décision mémorisé dans un circuit de mémorisation (11) et pour générer un signal de reconnaissance (Sr) uniquement si ladite au moins une partie de ladite perturbation correspond ou satisfait audit au moins un critère de décision et des moyens pour autoriser et synchroniser, sous l'effet dudit signal de reconnaissance, des échanges de données entre les circuits d'émission/réception de signaux (17, 14) du dispositif électronique embarqué et du dispositif électronique au sol par l'intermédiaire de ladite antenne embarquée et de ladite antenne fixe pendant qu'elles sont couplées entre elles,. wherein the electronic ground device (8) comprises means for detecting (10, 22) a disturbance or variation of a magnetic field to which said fixed antenna is responsive, induced during the passage of a vehicle in the vicinity of this fixed antenna, a detection circuit (10) for detecting the disturbance or variation of the magnetic field of the antenna - metal loop induced during the displacement of a vehicle, a comparison circuit (12) for comparing at least a portion of said disturbance or variation with at least one decision criterion stored in a storage circuit (11) and for generating a recognition signal (Sr) only if said at least a part of said perturbation corresponds or satisfies said audit at least one decision criterion and means for authorizing and synchronizing, under the effect of said recognition signal, data exchanges between the signal transmission / reception circuits (17, 14) of the on-board electronic device and the electronic device on the ground via said onboard antenna and said fixed antenna while they are coupled together ,.
9. Dispositif de transmission selon la revendication 8, dans lequel l'antenne fixe comprend une antenne-boucle (5) reliée à un générateur de courant (9).  9. Transmission device according to claim 8, wherein the fixed antenna comprises a loop antenna (5) connected to a current generator (9).
10. Dispositif de transmission selon la revendication 9, dans lequel le circuit d'émission/réception de signaux (14) du dispositif électronique au sol (8) est relié à l'antenne-boucle (5) et comprenant des moyens pour que le générateur de courant (9) et le circuit d'émission/réception de signaux (14) du dispositif électronique au sol (8) ne soient pas connectés en même temps à l'antenne-boucle (5).  Transmission device according to claim 9, in which the signal transmission / reception circuit (14) of the ground electronic device (8) is connected to the loop antenna (5) and comprises means for the current generator (9) and the signal transmission / reception circuit (14) of the electronic ground device (8) are not connected at the same time to the loop antenna (5).
11. Dispositif de transmission selon la revendication 8, dans lequel l'antenne fixe comprend un capteur magnétique à effet Hall ou magnétorésistif (21).  11. The transmission device of claim 8, wherein the fixed antenna comprises a magnetic sensor Hall effect or magnetoresistive (21).
12. Dispositif de transmission selon la revendication 8, dans lequel le dispositif électronique au sol et le dispositif embarqué comprennent des antennes radioélectriques reliées aux circuits d'émission/réception de signaux respectifs (18, 19).  The transmission device according to claim 8, wherein the electronic ground device and the on-board device comprise radio antennas connected to the respective signal transmission / reception circuits (18, 19).
13. Dispositif de transmission selon l'une quelconque des revendications 8 à 12, dans lequel le dispositif électronique au sol et le dispositif électronique embarqué comprennent des moyens de mémorisation (13, 16) de données à transmettre.  13. Transmission device according to any one of claims 8 to 12, wherein the electronic device on the ground and the on-board electronic device comprise data storage means (13, 16) to be transmitted.
PCT/EP2013/074445 2012-11-23 2013-11-22 Device and method for transmitting data between a vehicle and a device on the ground WO2014079962A1 (en)

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ES13795469.9T ES2630324T3 (en) 2012-11-23 2013-11-22 Procedure and data transmission device between a vehicle and a ground device
EP13795469.9A EP2923350B1 (en) 2012-11-23 2013-11-22 Device and method for transmitting data between a vehicle and a device on the ground

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FR1261177A FR2998699A1 (en) 2012-11-23 2012-11-23 METHOD AND ARRANGEMENT FOR TRANSMITTING DATA BETWEEN A VEHICLE AND A DEVICE ON THE GROUND

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