WO2001095285A2 - System zur übertragung von signalen von fahrzeugen - Google Patents
System zur übertragung von signalen von fahrzeugen Download PDFInfo
- Publication number
- WO2001095285A2 WO2001095285A2 PCT/AT2001/000186 AT0100186W WO0195285A2 WO 2001095285 A2 WO2001095285 A2 WO 2001095285A2 AT 0100186 W AT0100186 W AT 0100186W WO 0195285 A2 WO0195285 A2 WO 0195285A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- route
- frequencies
- vehicle
- frequency
- sections
- Prior art date
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Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L27/00—Central railway traffic control systems; Trackside control; Communication systems specially adapted therefor
- B61L27/70—Details of trackside communication
Definitions
- the invention relates to a system for transmitting signals from vehicles, in particular rail-bound vehicles, along at least one predefined route to at least one monitoring point to which the vehicles are at least temporarily connected via a radio link, a radio link between the vehicle and the monitoring point can be initiated both by the vehicle and by the monitoring station.
- a central monitoring point For example, the interiors of subway cars or passenger trains can be monitored using video cameras.
- the central monitoring point can be constantly or, if necessary, informed about the respective situation in the car or be informed and, if necessary, quickly take the necessary steps, for example in the case of vandalism files, emergencies, such as health problems of vehicle occupants, etc.
- Sound monitoring separately or in addition to video monitoring, can also be desirable and expedient.
- the situations mentioned are to be regarded as exemplary, and the most varied of situations for monitoring are possible, and the most varied of information is conceivable that can be transmitted to the monitoring point. Examples of this are the monitoring of trucks in long tunnels, which, for example, carry dangerous goods that require monitoring.
- the vehicle is equipped with at least one transmission device which is set up to transmit on one of a plurality of predeterminable frequencies, and
- the at least one route is subdivided into different route sections, with each route section being assigned at least one receiver for a defined, predeterminable frequency, and the frequencies being allocated to the individual receivers in such a way that at least one route section occurs between two route sections with the same frequency is arranged with another of the predeterminable frequencies.
- signals for example video signals
- a central monitoring point by a plurality of vehicles which can also be located or move in adjacent sections of the route, for example in the station area of a subway, without these signals being mutually exclusive to disturb.
- each vehicle transmits the corresponding signals at a specific frequency assigned to the vehicle at the respective time depending on its location in accordance with the assignment of the frequencies to the receiver of the route section, so that signals from different vehicles are not superimposed.
- the frequency arrangement is selected so that channel crosstalk is prevented.
- the frequency allocation for two adjacent sections of the route is selected such that the frequencies assigned to the sections of the route are separated by at least one predetermined frequency spectrum between the two Frequencies lying frequency are separated.
- Any channel crosstalk and interference due to harmonics can be prevented particularly reliably if the two frequencies are separated by two predetermined frequencies lying between them in the frequency spectrum.
- the frequencies are separated by at least one predetermined frequency lying in the frequency spectrum between them.
- At least five predetermined frequencies are used in the case of a route.
- Another implementation of the invention is characterized in that eight frequencies are used in the case of two or more routes.
- a favorable frequency allocation to the route sections of the routes is possible if two of the eight frequencies are used as empty frequencies and are not assigned to any route section.
- the response of several receivers operating at the same predetermined frequency and assigned to different route sections or different routes can be avoided in a simple manner if the receiver has a predefinable claim threshold for the HF signals.
- each receiver is assigned at least one antenna, which is arranged in the region of the corresponding route section.
- a directional antenna is used as the antenna, which has an orientation for receiving signals from a vehicle or a transmission antenna of the vehicle.
- At least one frequency scheme which contains the assignment of the predetermined frequencies to the route sections, is stored in a memory assigned to the vehicle. This scheme is used to switch the vehicle's transmitter.
- a frequency scheme is usually stored for each direction of travel along a route. Four frequency schemes are thus stored for two routes.
- position details relating to the route sections of a route are stored in a memory assigned to the vehicle, and the transmitter of the vehicle is switched to the frequency corresponding to the respective route sections from the position of the vehicle.
- the position of the vehicle is determined with a position transmitter.
- sensors are arranged in the area of connections between two routes, which are set up to activate a frequency scheme in the vehicle corresponding to the new route when a vehicle changes routes.
- Sensors are also set up to cause a changeover to one of at least two transmission antennas of the vehicle, which has an orientation corresponding to the receiving antenna of the route section, when changing the route.
- the additional information is shown in alphanumeric form.
- FIG. 1 schematically shows a vehicle set up to implement the invention for digital signal transmission
- FIG. 2 shows a schematic representation of the equipment of two route sections of adjacent routes for the reception of digital signals
- FIG. 3 schematically shows a vehicle set up to implement the invention for analog signal transmission
- 5-9 show exemplary frequency allocations for a route
- 10-12 show exemplary frequency assignments for two adjacent routes.
- FIG. 1 shows a FAR railway vehicle set up for carrying out the invention.
- this is a subway set, for which a symmetrical structure with regard to the electronic components, in particular with regard to the arrangement of the antennas EAF and SAF, is necessary due to their length and special circumstances during the day.
- the set shown has a transmitting antenna SAF and a receiving antenna EAF at least on its front and on its rear, for example in the area of the driver's cab.
- the receiving antenna EAF is connected to a transmitter SEN via a receiver EPF and a modem MODI.
- the vehicle can now be addressed by a central monitoring point, which is not shown in the drawing, via a radio channel of the on-board radio, for example a specially provided information channel, and the transmitter SEN can be probed up by the monitoring point.
- the transmitter SEN is set up to send signals, for example video signals originating from a video camera CAM, on a frequency corresponding to the respective route section in which the vehicle is at the moment of transmission.
- signals for example video signals originating from a video camera CAM
- the signal originating from the camera CAM is digitized by means of a coder COD and a modulator MDD and modulated onto a radio signal.
- a vehicle FAR as shown in FIG. 2
- the vehicle sends the signals mentioned at the frequency f2 assigned to the route section.
- a vehicle not shown, which is located or moving simultaneously in section ABS1 of the route GLEl, can, as a result of the invention, as will be explained in more detail later, simultaneously send signals, specifically on the frequency fl assigned to the section ABSl, without it mutual interference of the emitted signals of the different vehicles comes.
- the frequencies f1, f2 mentioned by way of example are predetermined frequencies originating from a specific frequency range, the frequency range being arranged, for example, in the range around 2.4 GHz or around 37 GHz.
- each section ABS1, ABS2 has an associated receiver EMPL, EMP2 and at least one antenna ANT1, ANT2 assigned to the receiver, in which it it is usually a directional antenna which is oriented in such a way that an optimal reception of signals originating from a transmitter SEN of a vehicle FAR on the frequency fl, f2 corresponding to the receiver EMPL, EMP2 is ensured.
- the signals received by an antenna ANT1, ANT2 are fed to the receiver EMPl, EMP2 working on the frequency fl, £ 2, the signal being amplified in an amplifier VER in order to compensate for the cable loss.
- the demodulation and decoding of the digital signals takes place in a demo dulator DEM and decoder DEC, and finally the video signal is converted in a converter WAN for transmission to the monitoring point from copper to fiber optic cable.
- the entire device shown for receiving and processing the signals is in each case connected to a power supply NET by means of a DC voltage switch WEI.
- the frequency schemes relating to the frequency assignments to the route sections of the route are stored in the vehicles in a memory which is assigned to an on-board computer PRO of the vehicle.
- four frequency schemes are stored in the memory, namely one scheme for each route for both the outward and the backward direction.
- position information relating to the route sections with the associated frequencies are stored in the memory.
- the vehicle can determine its current location at any time, and if a section boundary is crossed between two sections of the route, the transmitter SEN is switched to the corresponding frequency by the computer PRO using the modem MOD2 using the frequency scheme stored in the memory.
- information relating to the train identification, direction of travel, time, exact position, which is determined, for example, with a position transmitter and fed to the on-board computer, etc. can be taken from the on-board computer PRO.
- this information is added to the video signal, for example in alphanumeric form, by means of an insertion device EIN.
- EIN an insertion device
- FIGS. 1 and 2 show the electronic devices of a vehicle FAR for sending analog video signals
- FIG. 4 shows the corresponding equipment of two sections of the route for receiving and forwarding analog signals.
- the essential difference from the digital embodiment is the lack of a coder COD for digitizing the information coming from the video camera CAM, and the corresponding lack of a decoder DEC in the receiving system in FIG. 4 ,
- a system according to the invention for transmitting analog (video) signals has the advantage over digital transmission that it can be implemented at a considerably lower cost at the present time; however, the user is forced to accept certain losses in the quality of the transmission in the case of analog transmission.
- the vehicle transmitter SEN is started up by addressing the vehicle from a monitoring point or by activating the transmitter by a vehicle occupant, for example the vehicle driver or a vehicle guest.
- the transmitter it is of course also possible for the transmitter to be activated automatically, for example as a result of a specific event. It is conceivable that, for example, if the temperature in the vehicle interior is exceeded, this is determined by a temperature sensor and the transmitter is keyed up for the transmission of video signals from the interior. If the vehicle responds from a monitoring point, the vehicle is addressed, for example in the case of a subway train, by on-board radio, the signal transmitted by the monitoring point being coded in accordance with the identification of the desired vehicle.
- the 5-tone sequence selective call method with which each vehicle can be addressed separately, is often used for coding. Furthermore, it is also possible to address a specific camera from the monitoring point, since at least one camera is installed in the interior of each wagon, for example in the case of a subway train. The signal sent by the monitoring point for pushing up is fed to the modem MODI after receiving via the receiving antenna EAF via the receiver EPF, which generates a switching signal for the transmitter SEN. Finally, it should also be noted that the activation of a specific camera is of course also possible in the case of activation by a vehicle occupant or by a predetermined event. After activation of the transmitter, the images recorded by the video camera, which is generally constantly running, are transmitted to the monitoring point. For the sake of completeness, it should also be noted that a sound transmission can easily be added to the video signals, so that it is possible, among other things, for the vehicle occupants to transmit spoken messages to the monitoring point.
- the invention is shown here essentially using the example of a subway. Of course, the invention also works with railroad trains, trucks, etc. Motor vehicles are keyed up for example by responding from the monitoring point by means of a 5-tone sequence selective call via the on-board radio.
- An essential point of the invention relates to the distribution of the different frequencies available between the different sections of the route.
- one is confronted with one and in particular two-lane routes, such as with subways. Occasionally there is the case that approximately two or more routes, in particular the tracks of a subway, are arranged one above the other. It is therefore to be assumed in the following by way of example in FIGS. 5-9 that single-track underground lines with a track GLE1 and in FIGS. 10-12 of two-line underground lines with the tracks GLE1, GLE2.
- the main points to be considered when dividing the frequency are that
- Vehicles that are located on adjacent sections of a track or a route transmit at different frequencies
- the frequencies are selected in such a way that a channel skip and / or interference due to harmonics of the carrier waves between two different frequencies of adjacent or overlapping sections of the radio range is excluded.
- the route sections are of the same length, which, however, does not have to be realized in practice, since the most varied of circumstances relating to the routes must be taken into account here.
- the section division it is also by no means necessary or customary for the section division to be substantially symmetrical with respect to the longitudinal extent of the travel routes, for example, in the case of two travel routes running side by side or one above the other.
- the frequencies that can be allocated to the individual sections of the route are specific, predetermined frequencies fl-f8 from a specific frequency range, for example from the range around 2.4 GHz or 37 GHz.
- the relationship fl ⁇ f2 ⁇ f3 ⁇ f4 ⁇ f5 ⁇ f6 ⁇ f7 ⁇ f8 applies to the frequencies in the examples shown.
- the individual sections of the route are provided in the following with the reference symbols ABS1 - ABS11, ABSl '- ABS8', ABSl "- ABS8". 5 shows an example of a single-track subway line, in which only two predetermined frequencies fl and £ 2 are used for the division into the line sections ABS1-ABS3.
- the middle section ABS2 should have such a large length so that when signals from a vehicle are sent in the section ABS1 or ABS3 on the frequency fl, the receiver for the frequency fl in section ABS3 or ABSl no longer responds to enable interference-free transmission of signals from the vehicles.
- this requirement is also not absolutely necessary.
- the receiving antennas for a section of the route are each - seen in the direction of travel - arranged at one end of a section, so that there is usually sufficient distance between a vehicle transmitting at frequency fl (£ 2) in section ABS1 (ABS2) and one on the Frequency fl (£ 2) receiving receiver is in a section ABS3 (section ABS4 no longer shown) to prevent reception in a different section than that in which the vehicle is at the moment of transmission.
- fl £ 2 in section ABS1
- ABS3 section ABS4 no longer shown
- FIG. 6 shows an example of a frequency allocation on a route in which three frequencies fl ⁇ £ 2 ⁇ £ 3 are used.
- the route sections ABS1, ABS4 with the same predetermined frequency f1 are separated from one another by two route sections ABS2, ABS3 with other predetermined frequencies £ 2, £ 3.
- This arrangement has the advantage over that shown in FIG. 3 that, on the one hand, this scheme can basically be repeated as often as desired along a given route, so that even longer routes can be covered with this scheme, and also a response of the receiver for section ABS4 to one Sending a vehicle in section ABSl is reliably prevented.
- FIGS. 5 and 6 assume that, on the one hand, very precisely working transmitters and receivers are used, and, on the other hand, the predetermined frequencies are arranged in the available frequency range in such a way that channel crosstalk and interference as a result of harmonics from the Carrier frequencies between adjacent frequencies fl, f2, etc. is not possible. It is often for cost reasons and various other reasons, for example the assignment of frequency ranges, not possible to meet these requirements.
- FIGS. 1-9 therefore show examples of frequency assignments with five or six predetermined frequencies used, in which these problems are reliably prevented.
- five predetermined frequencies fl - £ 5 are used in the diagram according to FIG. 7.
- the advantage of this arrangement of frequencies is that between two sections, such as ABS1, ABS6, with the same predetermined frequency fl, four sections ABS2 - ABS5 with different frequencies £ 3, f5, £ 2, f4 are arranged.
- the assignment of the frequencies is selected such that the frequencies fl, £ 3 are separated between two neighboring sections, such as ABS1 and ABS2, by a frequency £ 2 between them in the frequency spectrum of the given frequencies fl - £ 5, so that interference is prevented.
- the frequencies £ 5, £ 2 are even separated between the sections ABS3 and ABS4 by two frequencies £ 3, £ 4 lying in the frequency spectrum between them.
- FIG. 8 shows an arrangement in which five predetermined frequencies fl-f5 are also used.
- Route sections ABS1, ABS4 with the same frequency fl are separated from one another by two route sections ABS2, ABS3 with other predetermined frequencies ⁇ , f5.
- Adjacent sections ABS1, ABS2 ABS2, ABS3; ABS3, ABS4 each have frequencies fl, £ 3 (£ 3, £ 5; f5, fl), those in the spectrum of the given frequencies fl - £ 5 by at least one between them Frequency £ 2 (f4; £ 2, £ 3, f4) are separated.
- this can be repeated as often as desired along a route, but in the scheme according to FIG. 8 it is necessary that the two frequencies £ 2, £ 4 are used as idle frequencies and are not assigned to any route section ,
- FIG. 9 shows an example of a single-track line, in which six predetermined frequencies fl-f6 from a certain frequency range are used.
- This arrangement has the advantage that, on the one hand, there are three route sections ABS2-ABS4 with different predetermined frequencies f6, f2, f5 between two route sections, for example ABS1, ABS5 with the same predetermined frequency fl, and the frequencies can also be selected such that frequencies from neighboring route sections are separated by at least two frequencies lying between them in the frequency spectrum.
- the use of idle frequencies is necessary; For example, in the scheme according to FIG. 9, the frequencies £ 3 and f4 are used as idle frequencies and are not assigned to any section of the route.
- 10-12 show frequency schemes for double-track lines. 10 shows a simple scheme, which, however, presupposes that due to the frequencies used fl ⁇ £ 2 ⁇ £ 3 and the transmitter and receiver, a channel skip between two frequencies lying in the frequency spectrum of the predetermined frequencies fl - £ 3 and interference in succession harmonics are not possible.
- a further problem that arises with this arrangement is that line sections with the same frequency, for example the sections ABS1 ', ABS4' on track GLE1 with the frequency fl or approximately the line sections ABS1 ", ABS4" on track GLE2 the frequency £ 2, each separated by two sections ABS2 ', ABS3' with frequencies £ 2 and £ 3 or sections ABS2 ", ABS3" with frequencies £ 3, fl, but that overlap in terms of radio range, in the simplified representation 10 diagonally opposite sections ABS1 "-ABS2 ', ABS2" - ABS3', etc. of different tracks have the same predetermined frequency £ 2, £ 3, etc., so that here potential interference factors for a transmission of signals from the vehicles can be given.
- One way of eliminating this source of interference is to use receivers with a predefinable claim threshold for the RF signals in the route sections, so that the receiver does not react to signals coming from a vehicle from another route section as a result of their weakening.
- it will also have to be assessed in individual cases from the circumstances in connection with the individual route, whether the frequency division shown in FIG. 10 can be used or whether a scheme with more than three frequencies, as shown in FIG. 11 and in particular Fig. 12 must be used as an example.
- the scheme shown in FIG. 11, in which five predetermined frequencies fl-£ 5 are used, has the advantage over that of FIG. 10 that on the one hand, for example, between sections ABS1 ', ABS6' of a track GLEl with the same frequency fl four Route sections ABS2 '- ABS5' with other predetermined frequencies £ 3, £ 5, £ 2, £ 4.
- adjacent route sections along a track are separated in terms of frequencies by at least one frequency lying between them in the spectrum of the predetermined frequencies.
- sections ABS1 ", ABS2 'ABS2", ABS3', diagonally opposite one another in the simplified illustration in FIG. 11, are shown; ABS1 ', ABS2 "; ABS2', ABS3" etc. of different tracks, different predetermined frequencies £ 2, £ 3; f4, £ 5; fl, f4; £ 3, fl up.
- FIG. 12 shows a further advantageous scheme with eight frequencies used, two of the frequencies, namely £ 3 and f ⁇ , being used as idle frequencies and not assigned to any section of the route.
- the invention can also be used if it is necessary to change the route for one or more vehicles, for example changing the tracks in the case of subways. This may be necessary as a result of construction sites or accidents etc.
- the vehicle's on-board computer PRO has the current scheme for frequency allocation on the route currently being used.
- subways with at least one transmitting antenna on the front and rear of the vehicle, it is also necessary to switch between the respective transmitting antennas facing the route.
- This switching of the frequency schemes and the transmission antennas is achieved, for example, by arranging at least one sensor, for example an infrared sensor, in the area of connections between two routes, for example switches for the subway rails, which detects a change in route of the vehicle. As soon as such a change of route of a vehicle is detected by a sensor, a switching signal is emitted via a suitable switching unit to a receiving unit, which is connected to the on-board computer, which switches over to the new, current frequency scheme and, if necessary, also switching to the appropriate transmitting antenna.
- a sensor for example an infrared sensor
- each route for example the two tracks in a two-track subway
- the sections on different routes can be arranged offset from one another along the routes and can have different lengths.
- two route sections coincide in pairs with regard to their longitudinal extent along the tracks, as is the case with the sections in FIG. 2 ABSl and ABS2 along the routes GLEl and GLE2 can be clearly seen.
- the frequencies can also be assigned by one Subdivide into blocks, each block then comprising two coinciding sections.
- this different formulation of the subdivision of the routes can of course in no way lead out of the scope of protection of the claims, since in this case two frequencies, one for each route in the block, are assigned to each block for the functioning of the invention must be and thus implicitly a subdivision of the route in terms of frequencies into sections.
- the invention provides a system with which, for example, video sequences can be transmitted in real time, for example from wagons of a subway train, which are then forwarded, for example, to a central monitoring point, with a simultaneous transmission of the signals from a large number of vehicles that are in one Stop traffic network, becomes possible. This ensures complete, complete monitoring of these vehicles. In critical situations, the monitoring point is informed about the events in the vehicles at all times and suitable measures can be initiated in the shortest possible time.
- the invention is intended to be able to monitor a large number of vehicles on predetermined routes simultaneously.
- the vehicles can also receive information based on the specified system according to the invention. These can then be displayed, for example on a suitable display in the vehicle interior.
- the return channel can therefore also be used as an information channel, for example for the vehicle occupants. Accordingly, the vehicles must of course be equipped with suitable receiving devices and the route sections with transmitting devices.
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001273729A AU2001273729A1 (en) | 2000-06-05 | 2001-06-05 | System for the transmission of signals from vehicles |
EP01940012A EP1287512A2 (de) | 2000-06-05 | 2001-06-05 | System zur übertragung von signalen von fahrzeugen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ATA981/00 | 2000-06-05 | ||
AT9812000 | 2000-06-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001095285A2 true WO2001095285A2 (de) | 2001-12-13 |
WO2001095285A3 WO2001095285A3 (de) | 2002-09-19 |
Family
ID=3683799
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AT2001/000186 WO2001095285A2 (de) | 2000-06-05 | 2001-06-05 | System zur übertragung von signalen von fahrzeugen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1287512A2 (de) |
AU (1) | AU2001273729A1 (de) |
CZ (1) | CZ20023885A3 (de) |
WO (1) | WO2001095285A2 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4209749A (en) * | 1976-09-30 | 1980-06-24 | Siemens Aktiengesellschaft | Railway communication system |
EP0240051A1 (de) * | 1986-03-07 | 1987-10-07 | Koninklijke KPN N.V. | Mit Bakensendern versehenes Funkverbindungssystem |
EP0618688A2 (de) * | 1993-04-01 | 1994-10-05 | Daimler-Benz Aerospace Aktiengesellschaft | Funksystem zur Nachrichtenübertragung zwischen mindestens einer Mobilstation und n langs einer Strecke angeordneten ortsfesten Basisstationen |
EP0890496A1 (de) * | 1997-06-11 | 1999-01-13 | Ralf Dipl.-Ing Rehmet | Verfahren und Anordnung zur Überwachung eines schienengebundenen Verkehrsmittels |
-
2001
- 2001-06-05 EP EP01940012A patent/EP1287512A2/de not_active Withdrawn
- 2001-06-05 CZ CZ20023885A patent/CZ20023885A3/cs unknown
- 2001-06-05 AU AU2001273729A patent/AU2001273729A1/en not_active Abandoned
- 2001-06-05 WO PCT/AT2001/000186 patent/WO2001095285A2/de not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4209749A (en) * | 1976-09-30 | 1980-06-24 | Siemens Aktiengesellschaft | Railway communication system |
EP0240051A1 (de) * | 1986-03-07 | 1987-10-07 | Koninklijke KPN N.V. | Mit Bakensendern versehenes Funkverbindungssystem |
EP0618688A2 (de) * | 1993-04-01 | 1994-10-05 | Daimler-Benz Aerospace Aktiengesellschaft | Funksystem zur Nachrichtenübertragung zwischen mindestens einer Mobilstation und n langs einer Strecke angeordneten ortsfesten Basisstationen |
EP0890496A1 (de) * | 1997-06-11 | 1999-01-13 | Ralf Dipl.-Ing Rehmet | Verfahren und Anordnung zur Überwachung eines schienengebundenen Verkehrsmittels |
Also Published As
Publication number | Publication date |
---|---|
AU2001273729A1 (en) | 2001-12-17 |
CZ20023885A3 (cs) | 2003-06-18 |
EP1287512A2 (de) | 2003-03-05 |
WO2001095285A3 (de) | 2002-09-19 |
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