EP2006954B1 - Kommunikationsgerät für Schienenfahrzeuge - Google Patents

Kommunikationsgerät für Schienenfahrzeuge Download PDF

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Publication number
EP2006954B1
EP2006954B1 EP08104085.9A EP08104085A EP2006954B1 EP 2006954 B1 EP2006954 B1 EP 2006954B1 EP 08104085 A EP08104085 A EP 08104085A EP 2006954 B1 EP2006954 B1 EP 2006954B1
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EP
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Prior art keywords
waveguide
antenna
slots
vehicle
radiation
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EP08104085.9A
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English (en)
French (fr)
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EP2006954A1 (de
Inventor
Marc Heddebaut
Denis Duhot
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Alstom Transport SA
Institut Francais des Sciences et Technologirs des Transports de lAmenagement et des Reseaux
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Alstom Transport SA
Institut Francais des Sciences et Technologirs des Transports de lAmenagement et des Reseaux
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    • 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
    • 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 train, e.g. to release brake or to operate a warning signal
    • B61L3/16—Continuous control along the route
    • B61L3/22—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation
    • B61L3/227—Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation using electromagnetic radiation

Definitions

  • the present invention relates to a communication device between one or more rail vehicles and a control station in general, and relates, more particularly, to a continuous radiating waveguide communication device.
  • a fundamental mode radiant waveguide communication device also called TE 01 mode
  • This device comprises a hollow tube parallel to a transport path and deposited along this path in a continuous manner, forming a waveguide, of which a single emitting face is pierced with a network of geometrically asymmetrical openings for the passage of a electromagnetic radiation at microwave frequencies.
  • This network of openings (called “slots" in the remainder of the description because of their narrow and elongated geometry) is itself then arranged to direct its emissive face at a small distance from the integral antenna of the vehicle, movable on along the radiating waveguide.
  • the geometry, the dimensions of the slots as well as the spacing between these slots are dimensioned according to the frequency ranges used.
  • the section of the guide is of the order of the wavelength and the large dimension of the slits is small in front of the wavelength.
  • the frequency range that can be used varies by country. In France and in many parts of the world, it can advantageously be carried out in the range of 2.4 GHz where are the exploitable channels according to IEEE 802.11 b and g standards called Wi-Fi for Wireless Fidelity or in the 5.8 GHz band according to IEEE 802.11 a.
  • the electromagnetic theory considers that for distances between antennas of the order of magnitude of the wavelength or of a small number of wavelengths, these antennas are said to operate in the near field and require a particular approach in order to study their coupling. For example, at 2.4 GHz, that is to say for a wavelength in air of 12.5 cm, the near field condition as conventionally expressed in electromagnetism is valid until at a distance of the order of magnitude of three to four wavelengths, or 40 to 50 centimeters. Beyond this distance, the antenna starts to operate in the far field.
  • the global signal radiated by the waveguide can be likened to the sum of each of the near field radiation of the few slots located upstream and downstream of the waveguide. current point where the antenna of the vehicle is. The energy is radiated perpendicular to the plane of the slots. It is not possible to demonstrate, for these short spans, a preferred direction of radiation such as would be obtained by considering the combination of far-field radiation of the slits when they have, between them, relations of appropriate phase and power.
  • the vehicle is provided with an antenna for transmitting and / or receiving microwave waves, promoting this close-field coupling between the emitting portion of the waveguide and the antenna of the vehicle, without any particular favorable orientation.
  • the traffic control station is provided with a power supply member of the microwave waveguide and / or at least one microwave wave reception member from the waveguide.
  • This device makes it possible to continuously maintain a high bandwidth link (> 100 MHz) between the ground control station and the vehicles.
  • the device also simultaneously authorizes the speed measurement of the vehicles without material contact with the ground and the location of the vehicles by reading a pseudo-random sequence etched in the structure of the waveguide.
  • the device is operational whatever the environment of the track (tunnel, viaduct, trench ).
  • the use of high frequencies in the range of 2 - 6 GHz makes it possible to overcome most of the problems of electromagnetic compatibility that are binding in the railway environment.
  • the waveguide is made of metal.
  • the choice of this metal is a compromise between cost constraints and inherent conductivity constraints of the metal, affecting the conduction performance of the wave in the waveguide.
  • the longitudinal attenuation will be higher or lower and the number of transmitters / receivers per kilometer of waveguide required will be proportionally higher or lower.
  • the total longitudinal loss is the sum of the Joule loss and the loss due to the removal of energy from the wave that is radiated by the waveguide slots.
  • an aluminum waveguide exhibits a Joule linear loss of 15-16 dB / km and a linear loss by constraint limited by construction to 2-3 dB / km .
  • the antenna-train generally receives a single electric field component oriented in a privileged direction of the space and thus shows only a fraction of the energy emitted from the guide, the other part proves radiated without use. This in turn reduces the signal-to-noise ratio of the link, which in turn limits the effective throughput of the ground-to-train communication which must, however, be high in a modern ground-train communication system.
  • the possible propagation in this waveguide of several simultaneous propagation modes generates between these different modes of propagation beats and local signal attenuations requiring the use of a sandwich guide structure acting as a filter. modes, complex to achieve with acceptable materials in the railway environment, in terms of mechanical strength or emission of toxic fumes in case of fire ...
  • the rail network to be equipped with communication devices is dual-channel, waveguides are arranged parallel to each channel, with as many transmitters / receivers as necessary on each side.
  • the traffic control station thus communicates with each train running on each of the channels by sending the microwave waves in the two communication devices.
  • the problem that the invention aims to solve is to reduce the number of transmitters / receivers installed on the ground and to limit the length of guides to be installed along the double rail tracks in order to limit the quantity of material and the quantity of components required. without generating any particular mechanical constraint, to limit the time of installation or maintenance of the device while allowing a control station to communicate at high speed of information with the trains running on the two parallel tracks with the same security and the same availability as the communication device of the prior art.
  • These two parallel paths are spaced a significant distance, as expressed in wavelengths of the microwave communication signals used.
  • the continuous communication device between at least one railway vehicle and a control station, comprises at least one waveguide disposed between two parallel tracks resting on a non-emissive face, comprising two emissive faces each pierced by a network of openings for the passage of electromagnetic radiation in microwaves of given wavelength constituted by slots, at least one vehicle provided with at least one microwave transmission and reception antenna, the control station being provided with at least one microwave waveguide supply member and at least one microwave wave receiving member from the waveguide, and is such that the waveguide is parallelepipedic shape, whose emitting faces are arranged vertically.
  • a first advantage of the double grating slotted waveguide communication device is thus to halve the amount of material required to make the waveguides while only slightly increasing the number of emitters / receivers.
  • a second advantage of the dual-slot grating waveguide communication device is to impose fewer installation constraints on the track by deporting the waveguide out of the way itself, thereby facilitating operations. maintenance of it.
  • a third advantage is that with this arrangement, the waveguide, although robust is less exposed to material damage related to falling objects or trailing vehicles including track maintenance.
  • a fourth advantage is that the vertical arrangement of the double network of slots makes it less sensitive to the accumulation of dirt, water, snow, ice ... on its emitting surfaces.
  • the dimensions of the waveguide are such that only the basic propagation mode TE 01 is used, which leads to a mechanical simplification of the guide since the different propagation modes must no longer be filtered.
  • the figure 1 represents a communication device between a control station P and at least one vehicle A traveling on a track, comprising a plurality of fixed waveguides 1, 1 ', 1 n , etc., arranged continuously and end to end along the way.
  • the length of the communication device depends on the type of network.
  • a waveguide is several hundred meters long and the communication device comprises n waveguides covering the entire railway network.
  • the waveguide 1 consists of two separate sections 1a and 1b, in which the waves are injected, for example by means of a coaxial transition towards a waveguide, at the ends 2a and 2b of the sections 1a and 1b. 1 b.
  • the ends 3a and 3b of the waveguide 1 are charged in order to avoid the establishment of a standing wave regime in the waveguide, for example by means of a waveguide to coaxial transition and a charge.
  • the ends 3a, 3b do not transmit any wave to the adjacent waveguides 1 'and 1 n .
  • the waves are transmitted or received by a transmitter / receiver 4 which is connected to a communication network R connecting all the emitters / receivers 4, 4 ', 4 n ...; at the control point P.
  • the information flows from checkpoint P to vehicle A -or conversely- by the communication network R, the transceivers 4, 4 ', 4 n and the waveguides 1, 1 1 n .
  • the waveguide 1 is of parallelepiped shape, the large faces 6a, 6b being pierced with slots 8a, 8b (here shown vertical) which radiate or receive the waves.
  • the faces 6a, 6b are said to be “large” because their side b is larger than the side a of the "small” faces 7a, 7b.
  • the large dimension b of the emissive faces 6a, 6b is of the order of magnitude of the wavelength.
  • the large dimension D of the slots is much smaller than the length of the side b : it is at least five times smaller than the wavelength propagated in the guide. This makes it possible to limit the linear radiation losses to 2-3 dB / km while maintaining a power radiated by the guide sufficient to ensure high-speed communication with the vehicle.
  • b ⁇ ⁇ And D ⁇ ⁇ / 5 ⁇ being the wavelength of the electromagnetic radiation propagating in the guide.
  • the large dimension D of the slots is arranged in the vertical direction perpendicular to the direction of the waveguide.
  • This arrangement and the very dissymmetrical shape of the slots (D is at least 6 times greater than the small size of the slots) allow to radiate essentially a single electric field component, oriented in the direction of the guide. This electric field component is exploited by the antenna of the vehicle. This limits the energy taken from the guide and radiated outward to the minimum required for ground-vehicle communication.
  • a waveguide operating at a low frequency of 2.4 GHz in fundamental mode has a large face b of about 12.5 cm, the wavelength ⁇ of the electromagnetic radiation propagating in the guide.
  • the large dimension of the slots D is 19 mm, the small dimension of the slots is 3 mm and the inter-slot pitch is 61 mm.
  • the large dimension D 1 of all the slots 8a of an emissive face-for example the emitting face 6a- can be uniformly increased with respect to the large dimension D 2 of the slots 8b of the other emissive face 6b.
  • This arrangement makes it possible to reinforce the electromagnetic radiation towards one of the two paths. This allows, by way of example, to compensate for a lack of symmetry in laying the waveguide between the channels as related to the configuration imposed by the site, a channel that may be further distant from the waveguide 1 than the other.
  • the guide could be of circular or oval section and have a similar behavior of its electromagnetic radiation in the air.
  • the figure 4 is a view of the continuous communication device between the traffic control station P (not shown) and two trains A and B traveling in two opposite directions on two parallel tracks, 2 and 3.
  • the following description is given when two trains are present on the channels 2 and 3 but it is understood that the operation of the device is exactly the same even when there is only one train running on a single lane.
  • the waveguide 1 is disposed between the two channels 2 and 3, its small face 7b being placed on the ground, or on a support at a distance from the ground, the large faces 6a, 6b, which are emissive, being at the vertical.
  • this waveguide 1 could be suspended in a tunnel vault, between two channels (2, 3).
  • the traffic control station P communicates with the trains A and B by injecting into the waveguides 1, 1 ', 1 n of the signals S1, S2 in the form of a set of microwave waves, which propagate according to a mode of propagation "Go" inside the waveguide 1a, 1b and which are all radiated by the emitting faces of the waveguide 1a, 1b towards the antennas 5 of the trains A and B (the waves emitted are symbolized on the Fig. 4 by two-way double arrows).
  • Each onboard antenna thus receives all the waves injected into the waveguide 1a, 1b ( Fig. 1 ), the receiver of each antenna processing in a known manner the received signals S1, S2 so as to identify which signal is addressed to it.
  • One or more antennas may be provided on board, on the same side or on each side of the train.
  • the power of the waves is maximum near the ends 2a, 2b ( Fig. 2 ) on the other hand, at the ends 3a, 3b, the power of the waves is minimal since the wave has lost energy by propagating along the guide and radiating by slots 8a, 8b.
  • the embedded antennas 5 are transmitters and receivers.
  • the trains A and B communicate with the control station P by transmitting microwave signals via the on-board antennas 5 to the waveguide 1, these signals then being propagated from the slots 8a, 8b of the emitting faces 6a, 6b towards the ends 2a, 2b ( Fig. 1 ) of the waveguide 1 with a propagation mode "return" identical to that of the "go".
  • the power of the wave injected into the waveguide 1 decreases towards the ends 2a, 2b to reach the transmitter / receiver 4 (FIG. Fig. 1 ).
  • antennas can be made from a waveguide type transmission line. So the "Antenna Engineering Handbook” by Richard C. Johnson and Henry Jasik publishes, in his second edition edited by McGraw-Hill Book Company (chapter 10 page 11 ), an antenna description called "Leaky wave antenna”. This antenna is constructed from a waveguide of rectangular section of short length. It uses slots whose large size is of the order of magnitude of the half-wavelength.
  • These antennas are developed in order to obtain on the one hand a significant efficiency, that is to say in particular having the ability to radiate by means of a reduced antenna (of the order of a few wavelengths) all the energy that is communicated to them and, on the other hand, to focus at a great distance the energy radiated in the preferred direction of the desired space.
  • a reduced antenna of the order of a few wavelengths
  • Such an antenna thus operates in far field and its radiation pattern is directional.
  • the object of the invention is on the contrary to strongly limit the radiation of the structure so as to take only very little energy from inside the guide.
  • the waveguide 1 is therefore pierced with very small slots 8a, 8b which individually take only a very limited amount of energy from inside the guide, as previously described.
  • each slot 8a, 8b of the waveguide 1 according to the invention radiates, unlike the waveguide antennas pierced with four previously described slot gratings, independently without significant interaction. with the energy propagated in the guide or with other slits 8a, 8b close.
  • the radiation of different slot networks 8a, 8b disposed on opposite emissive faces 6a, 6b of the waveguide 1 are effected in substantially independent ways, without significant coupling between the two emissive faces 6a, 6b. This effect therefore makes it possible to transmit and receive signals continuously and over great distances by n waveguides 1 arranged in the channel, each waveguide 1 radiating through two networks of slots 8a, 8b whose radiation characteristics are independent of each other.
  • the theory of polarizabilities demonstrates that the radiation of a slot whose transverse dimensions are very small in front of the wavelength is, if it is practiced in a thin conductive plane, and under far-field condition, comparable to that of an elementary magnetic dipole oriented along the axis of the large dimension of this slot which radiates an electric field component oriented in the direction of the guide.
  • This elementary magnetic dipole is born due to the interruption of current lines on the surface of the metal related to the presence of the opening.
  • This magnetic dipole equivalent radiation is oriented perpendicular to the plane of the slot.
  • the waveguide 1 according to the invention therefore operates in a far-field and its radiation pattern is directional. However, it does not function as a waveguide of the prior art since the waveguide 1 according to the invention operates in a far field and not in a near field. It also does not function as a waveguide antenna of the prior art since the waveguide 1 according to the invention radiates only a tiny portion of the signal energy which passes through it on a very high frequency. long guide distance, while an antenna of the prior art radiates all the energy of the signal which passes through it over a very short guide distance.
  • the calculation of the inter-slot spacing is effected in a known manner taking into account, on the one hand, the phase shift introduced by the propagation of the microwave signals in the waveguide 1, and on the other hand the phase shift of these signals introduced by the propagation of the signals in the air on either side of the waveguide 1, after passage of the energy through the slots 8a, 8b.
  • a critical inter-slot spacing that is to say allowing a constructive summation of radiation of different consecutive slots, the order of magnitude is a few centimeters in the 2.4 - 5.8 GHz - an order of magnitude a little less than the half-wavelength of the signals emitted in the air- thus provides a signal of constant amplitude above the guide, regardless of the position of the antenna: above a slot, between two slots, etc .... Beyond this critical spacing , the signal transmitted by the network of slots fluctuates strongly from one opening to another and is therefore not very exploitable to maintain the communication ground-trains.
  • the figure 5 represents the radiation pattern of the waveguide 1 according to the invention, the slots 8a, 8b of the two emissive faces being of identical dimensions.
  • the axis of the waveguide 1 corresponds to an angle of 0 °. Due to the symmetrical realization of the two slot gratings, a radiation pattern symmetrical with respect to the axis of the waveguide 1 consisting of two main lobes 9 and 10 appears. These two main lobes 9 and 10, transposed to the transport environment of the figure 3 , allow the electromagnetic energy to be concentrated simultaneously towards the two transport paths 2 and 3, by means of a single radiating waveguide 1 disposed in a central position on the ground or in a tunnel vault.
  • the radiating waveguide 1 is installed continuously between stations, over distances of several hundred meters. It has several thousands of slots.
  • these radiation lobes 9 and 10 have maxima that depend on the height of the waveguide above the ground.
  • the presence of the soil and its physical characteristics influence the radiation pattern in elevation of the radiating waveguide.
  • a compatible vehicle antenna height will be selected to locate the vehicle antenna in the main lobe of the vehicle.
  • the distance between the on-board antenna 5 and the waveguide 1 must be at least four wavelengths to operate in far-field conditions. Below four wavelengths, the antenna is placed in near field condition. However, in a near field condition, the radiation pattern is not formed and therefore does not allow the waveguide 1 to effectively focus the microwave energy to the antennas 5, and thus communicate between trains and ground with a optimized link budget.
  • the distance between the waveguide 1 and each antenna 5 of the vehicle A, B is in practice increased relative to the waveguide of the prior art, the gain brought by this summation and this energy concentration compensates. for a large part the additional attenuation of the signals which travel a greater distance in the air, from the waveguide 1 to the on-board antenna 5.
  • the antenna 5 of the vehicle A or B is arranged so as to be permanently close to a network of slots 8a or 8b having the radiation pattern of the figure 4 and progressively and continuously sweeps all the thousands of slots 8a or 8b of the waveguide 1 during the movement of the vehicle A or B ( Fig. 4 ).
  • the radiation pattern continuously accompanies the movement of the vehicle and provides continuously to the two transport paths 2 and 3 a maximum of electromagnetic energy in a preferred direction of space.
  • An omnidirectional antenna that is to say an antenna which highlights an electromagnetic field irrespective of the direction of arrival of a signal emitted or alternately which radiates in the same way an electromagnetic signal in all directions of the space may be suitable.
  • This antenna will be able to capture the signals emitted by the waveguide 1 in its preferred directions of radiation and to emit signals in the direction of the waveguide, in the same way as the signals received or emitted in other directions of space .
  • Such an antenna has no particular gain related to the focusing of energy in one or more preferred directions of space.
  • the signals highlighted by this antenna will be weak or will not to inject a high power into the waveguide, through the slots. This means that such an antenna will not achieve significant communication rates except increase the power emitted by the train or ground transmitter.
  • a directional antenna having a radiation pattern having radiation directivities allows the best possible transfer of energy between the waveguide 1 to the channel and this antenna.
  • the radiation pattern of the antenna must have at least one main lobe of radiation whose orientation is identical to that of one of the main lobes of the waveguide radiation pattern 1.
  • orientation is defined by the angle ⁇ that forms the axis of the main lobe with the axis of the antenna or the waveguide.
  • a collinear antenna 5 to the train must also have a starting angle of 30 ° in order to receive and transmit signals efficiently in this preferred direction from space. Such an antenna makes it possible to obtain high communication rates.
  • the total linear attenuation in the waveguide 1 is only slightly increased since, via a double number of identical slots, only the energy sampling loss from the waveguide is doubled.
  • the total linear loss thus goes from 18 dB to 21 dB in the case of an aluminum waveguide and the reduction in range would therefore be 3: 18 or about 17 %.
  • This range reduction can be mitigated by slightly reducing the size of the slots, which would however have the effect of reducing the energy emitted and received via the waveguide.
  • the behavior of the double slot network and its far-field radiation pattern are stable over a wide frequency band and in practice depends only on the proper propagation mode. inside the waveguide 1.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Health & Medical Sciences (AREA)
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Claims (9)

  1. Vorrichtung für eine kontinuierliche Kommunikation zwischen mindestens einem Schienenfahrzeug (A, B) und einer Kontrollstelle (P), aufweisend mindestens einen Wellenleiter (1, 1', In), welcher zwischen zwei parallelen Gleisen angeordnet ist und auf einer nicht abstrahlenden Fläche (7b) ruht, aufweisend zwei Emissionsflächen (6a, 6b), welche jeweils von einem Netz von Öffnungen (8a, 8b), welche durch Schlitze gebildet sind, durchstoßen sind zum Hindurchtreten einer elektromagnetischen Mikrowellenstrahlung einer gegebenen Wellenlänge, wobei mindestens ein Fahrzeug (A, B) mit mindestens einer Sende- und Empfangsantenne (5) für Mikrowellen versehen ist, wobei die Kontrollstelle (P) mit mindestens einem Element zum Versorgen des Wellenleiters (1, 1', 1n) mit Mikrowellen und mindestens einem Element zum Empfangen der Mikrowellen, welche aus dem Wellenleiter (1, 1', 1n) kommen, versehen ist, dadurch gekennzeichnet, dass der Wellenleiter (1, 1', 1n) eine Form eines Parallelepipeds aufweist und dass die Emissionsflächen (6a, 6b) vertikale Flächen des besagten Wellenleiters sind.
  2. Vorrichtung gemäß Anspruch 1, dadurch gekennzeichnet, dass die große Abmessung der Emissionsflächen (6a, 6b) des Wellenleiters (1, 1', 1n) von der Größenordnung der Wellenlänge der elektromagnetischen Strahlung ist, welche durch den Wellenleiter geleitet wird.
  3. Vorrichtung gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, dass die große Abmessung (D) der Schlitze (8a, 8b) kleiner ist als ein Fünffaches der Wellenlänge der elektromagnetischen Strahlung, welche durch den Wellenleiter (1, 1', 1n) geleitet wird.
  4. Vorrichtung gemäß einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Abstand zwischen den Schlitzen kleiner ist als die halbe Wellenlänge der an die Luft abgegebenen Signale.
  5. Vorrichtung gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die zwei Netze von Schlitzen (8a, 8b) identisch sind.
  6. Vorrichtung gemäß einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das eine von den Netzen von Schlitzen (8a, 8b) eine größere Abmessung als das andere (8a, 8b) aufweist.
  7. Vorrichtung gemäß einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Schlitze (8a, 8b) vertikal angeordnet sind.
  8. Vorrichtung gemäß einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Abstand zwischen der Antenne (5), welche an Bord eines Fahrzeugs (A, B) angeordnet ist, und der Kommunikationsvorrichtung mindestens vier Wellenlängen beträgt.
  9. Vorrichtung gemäß Anspruch 8, dadurch gekennzeichnet, dass die Antenne (5), welche an Bord eines Fahrzeugs (A, B) angeordnet ist, eine Abstrahlungs-Richtcharakteristik aufweist, welche mit derjenigen der Kommunikationsvorrichtung identisch ist.
EP08104085.9A 2007-05-31 2008-05-26 Kommunikationsgerät für Schienenfahrzeuge Active EP2006954B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0703876A FR2916907B1 (fr) 2007-05-31 2007-05-31 Dispositif de communication pour vehicule ferroviaire

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Publication Number Publication Date
EP2006954A1 EP2006954A1 (de) 2008-12-24
EP2006954B1 true EP2006954B1 (de) 2013-10-09

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CN (1) CN101353046B (de)
FR (1) FR2916907B1 (de)
SG (1) SG148137A1 (de)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN103873119A (zh) * 2014-03-27 2014-06-18 西南交通大学 一种车载双天线通信方法

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Publication number Priority date Publication date Assignee Title
CN102104410A (zh) * 2011-01-18 2011-06-22 京信通信系统（中国）有限公司 高速铁路微波通信网络
CN104810604B (zh) * 2015-04-20 2018-03-09 北京中城通咨询有限公司 一种地铁车地通讯系统和通讯方法
US10908254B2 (en) * 2018-12-20 2021-02-02 GM Global Technology Operations LLC Traveling-wave imaging manifold for high resolution radar system
EP3976440A1 (de) 2019-05-29 2022-04-06 Sew-Eurodrive GmbH & Co. KG Schienenanlage mit schiene und entlang der schiene bewegbaren mobilteilen

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US3470474A (en) * 1966-12-23 1969-09-30 Donald E Bilger Underground radio communication system for highways
US3648172A (en) * 1968-10-02 1972-03-07 Sumitomo Electric Industries Circular leaky waveguide train communication system
US3766378A (en) * 1971-06-03 1973-10-16 Japan National Railway Moving object automatic operation system
FR2608119B1 (fr) * 1986-12-12 1989-02-10 Alsthom Dispositif de transmission d'informations et/ou d'instructions a large bande passante entre un vehicule ferroviaire et un poste de controle de trafic
ES2039412T3 (es) * 1986-12-12 1993-10-01 Gec Alsthom Sa Dispositivo de transmision de informaciones y/o de instrucciones con banda ancha deslizante entre un elemento movil y una estacion de control.
FR2744865B1 (fr) * 1996-02-09 1998-03-20 Gec Alsthom Transport Sa Dispositif et procede de transmission d'informations pour systeme a guide d'ondes rayonnant

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103873119A (zh) * 2014-03-27 2014-06-18 西南交通大学 一种车载双天线通信方法
CN103873119B (zh) * 2014-03-27 2017-02-01 西南交通大学 一种车载双天线通信方法

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CN101353046B (zh) 2013-04-24
SG148137A1 (en) 2008-12-31
EP2006954A1 (de) 2008-12-24
FR2916907B1 (fr) 2010-09-10
CN101353046A (zh) 2009-01-28
FR2916907A1 (fr) 2008-12-05

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