AU699130B2 - Method and device for transmitting information by means of beacons and beacon for use in a device of this kind - Google Patents
Method and device for transmitting information by means of beacons and beacon for use in a device of this kind Download PDFInfo
- Publication number
- AU699130B2 AU699130B2 AU30270/95A AU3027095A AU699130B2 AU 699130 B2 AU699130 B2 AU 699130B2 AU 30270/95 A AU30270/95 A AU 30270/95A AU 3027095 A AU3027095 A AU 3027095A AU 699130 B2 AU699130 B2 AU 699130B2
- Authority
- AU
- Australia
- Prior art keywords
- beacon
- messages
- control device
- vehicle
- transmitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
- 238000000034 method Methods 0.000 title claims description 11
- 230000005540 biological transmission Effects 0.000 claims abstract description 35
- 230000003111 delayed effect Effects 0.000 claims abstract description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 230000001934 delay Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 230000003068 static effect Effects 0.000 claims 1
- 238000009434 installation Methods 0.000 description 4
- 230000001427 coherent effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000011664 signaling Effects 0.000 description 2
- 238000010420 art technique Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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 train, e.g. to release brake or to operate a warning signal
- B61L3/02—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or 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 train, e.g. to release brake or 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 train, e.g. to release brake or 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
- B61L3/121—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or 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 magnetic induction
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
Landscapes
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Radar Systems Or Details Thereof (AREA)
- Mobile Radio Communication Systems (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
- Multi-Process Working Machines And Systems (AREA)
- General Factory Administration (AREA)
- Near-Field Transmission Systems (AREA)
- Small-Scale Networks (AREA)
Abstract
The information transmission system includes the beacon (1) which is controlled by the control device (2), the beacon being fitted beneath the rails of a railway line. The signal transmitted by the beacon is picked up by the aerial (3) mounted on board the railway vehicle (5), for transmission to a unit (4) within the vehicle. When a vehicle is in the region of the beacon, the switching between successive messages is delayed. The transmission (7) which supplies the beacon carries an alternating voltage corresponding to the message, and a direct current component.
Description
AUSTRALIA
Patents Act COMPLETE SPECIFICATION
(ORIGINAL)
Class Int. Class Application Number: Lodged: Complete Specification Lodged: Accepted: Published: Priority Related Art: Ot* 4***r 5* S S S 45 I S 4 5t 4 *5 Name of Applicant: GEC Alsthom Transport SA Actual Inventor(s): Didier Riffaud Address for Service: PHILLIPS ORMONDE FITZPATRICK Patent and Trade Mark Attorneys 367 Collins Street Melbourne 3000 AUSTRALIA Invention Title: METHOD AND DEVICE FOR TRANSMITTING INFORMATION BY MEANS OF BEACONS AND BEACON FOR USE IN A DEVICE OF THIS KIND Our Ref: 420565 POF Code: 1501/202864 The following statement is a full description of this invention, including the best method of performing it known to applicant(s): -1f tr t Method and device for transmitting information by means of beacons and beacon for use in a device of this kind The present invention concerns automatic on-ground and on-board, systems for controlling traffic in urban transport networks and is more particularly concerned with a method and a device for transmitting information by means of beacons and with a beacon for use in a device of this kind.
Prior art information transmission devices use individual beacons.
These are passive beacons disposed on the ground.
Figure 1 shows a prior art information transmission device comprising on-board equipment on a rail vehicle and an on-ground installation.
15 The information transmission device shown in figure 1 comprises an on-ground installation 1, 2 and **,on-board equipment 3, 4 on a rail vehicle The on-ground installation comprises a beacon 1 and *its control device 2 connected together by a transmission line 7.
The beacon 1 is fixed to the sleepers on the axis of a rail track 6.
The on-board equipment include an antenna 3 and an evaluation unit 4.
The evaluation unit 4, which can be a computer, is supplied with power by its own converter and is connected to the antenna 3.
The antenna 3 is under the rail vejhicle preferably at the front of the vehicle.
The beacons used in systems for monitoring the speed of a train, for example, transmit information on the status of signalling ahead of their location.
This information is picked up by an antenna under? the train.
The beacon transmits bits serially at a bit rate of
&AMW
2 kbit/s, for example. These bits are produced by electronic control equipment responsible for generating a message.
The beacons have a fixed length which defines a region of space in which a train's on-board antenna is able to pick up the transmitted message.
This pick-up or contact length enables reception of a certain number of bits of a transmitted message.
A binary message is exchanged between a control device and a train via a beacon. The start of the message is synchronised to arrival of the train at the beacon and therefore to the start of reading of the beacon.
Figures 2A through 2C respectively show the 15 transmission of messages Mn by a prior art beacon, the reading of the message by the on-board antenna and the e6 V reconstruction of the transmitted message from the read message.
t Figure 2A shows a stream of identical messages Mn transmitted by a control device via a beacon to an on-board antenna.
.The on-board antenna has a predetermined read "window dependent on its structure.
The binary message read by the on-board antenna may S 25 not correspond to the complete message Mn, and more usually corresponds to two juxtaposed anJ complementary parts of two successive messages Mn.
Figure 2B shows the binary message read by the on-board antenna.
Figure 2C shows the binary message reconstructed on board the train.
At high speeds the capture length of the antenna makes it impossible to receive more than one message.
One consequence of the above considerations is that it is possible to reconstruct the transmitted message
I'
L i; _U~14 -3from reading a single transmitted message provided that both part-messages available belong to successive transmitted messages with identical contents.
A problem therefore arises if the equipment responsible for establishing the transmitted messages changes the content of the messages, for example to take account of a change in the signalling status.
One consequence of a change in the content of the transmitted messages is that the messages transmitted before and after the change have a different content.
The message reconstructed on board the train is then incoherent since it comprises parts of first and second transmitted messages with different contents.
An object of the invention is to provide a device for transmitting information via beacons that alleviates this drawback.
According to one aspect of the present invention there is provided a device for transmitting messages Mn to an on-board antenna on a vehicle by means of a beacon controlled by a control device adapted to effect a changeover C between said messages Mn and messages Mn+l wherein when said vehicle is near said beacon said control devie delays said changeover C between said messages Mn and said messages Mn+1 by transmitting one or more additional Mn messages Mns.
In a preferred form a device according to the present invention may also include the following features: *i:l the control device superposes an AC voltage corresponding to the transmitted messages Mn and a direct current on a transmission line connected to the beacon, and Sthe changeover C is delayed on detection of the presence of said vehicle at the location of said beacon.
According to a further aspect of the present invention, there is provided a beacon for use in devices for transmitting information connected to a control device by a transmission line including means for transmitting to said control device a signal relating to the presence of a vehicle near said beacon.
WJP C:YMNWORDV.4ARIEOGABNODEL%3270C.OOC ~;i~A~Kr -4- The beacon preferably includes: a first interface for alternating current signals only the function of which is to receive said messages transmitted by said control device and to transmit them so that an on-board antenna on a vehicle can read the messages Mn, a second interface for direct current only the functions of which are to transmit said signal relating to the presence of a vehicle near said beacon to said control device and to short-circuit said transmission line for direct current only on receiving an indication of the presence of said vehicle near said beacon.
According to a further aspect of the present invention there is provided a method of transmitting information Mn using the above device and in particular the above beacon, including the following steps: superposition by said control device of a direct current and an AC voltage corresponding to said transmitted messages on said transmission line connecting said beacon and said control device, short-circuiting said transmission line for direct current only by said second interface on reception by said second interface of an indication of the presence of said vehicle near said beacon, detection of the short-circuit by said control device, 20 delaying said changeover C between said messages Mn and said messages Mn+l by said control device transmitting one or more additional Mn messages Mns.
A preferred embodiment of the present invention will now be described with reference to the drawings in which:-
A
w W i" UW QMROAMANDEWCLO Figure 1 shows a prior art information transmission device comprising on-board equipment on a rail vehicle and an on-ground installation, Figures 2A through 2C respectively show the transmission of messages Mn by means of a prior art beacon, the reading of a message by means of the on-board antenna and the reconstruction of the message transmitted from the read message, using a prior art technique, Figures 3A through 3E respectively show the transmission of messages Mn by a prior art beacon, an indication of the presence of a train, the delayed 20 transmission of the changeover between the messages Mn and the messages Mn+1 by a beacon of the invention, the o o* reading of a message by the on-board antenna and the reconstruction of the transmitted message from the read S. message, Figure 4 shows a block diagram of a preferred embodiment of a beacon used in the device of the 9.
invention for transmitting information via beacons.
S.e Figures 1 and 2 are described hereinabove.
Figures 3A through 3E shows delayed transmission of 30 the changeover C between the messages Mn and the messages S* Mn+l by a beacon of the invention.
The control device can be advised of the presence of a train at the location of the beacon to prevent the reconstructed message being incoherent.
This indication of the presence of a train 6 introduces a time-delay into the changeover C of the message content.
When a train reaches the location of a beacon, the latter transmits to the control device an indication of the presence of the train that enables the control device to delay the changeover C of the transmitted message content.
To delay the changeover C between the messages Mn and the messages Mn+l the control device transmits one or more additional Mn messages Mns to the beacon.
It follows from what has been explained above that the two half-messages read by the on-board antenna are coherent and therefore enable the reconstruction of a coherent message.
15 Figure 4 shows a block diagram of a preferred embodiment of a beacon used in the device of the r invention for transmitting information via beacons.
The beacon 1 used in the information transmission .system is a passive device, i.e. it has no permanent 20 electrical power supply of its own.
What is more, the beacon 1 is supplied with power by remote power feed from a train 5 only when the train is present at the location of the beacon 1. The remote power feed is provided in a manner that is known in S. 25 itself through coupling between the antenna 3 on the train and the beacon 1.
Thus the beacon 1 is not capable of supplying energy to power an electrical transmission line 7 to the control device 2.
When a train 5 is present, the beacon 1 shortcircuits the end of the transmission line from the control device 2 for direct current only.
The control device 2 then detects a short-circuit of the transmission line 7 for direct current only and deduces that this indicates the presence of a train 5 at 'f I 7 the location of the beacon 1 connected to the shortcircuited line.
In accordance with the invention, the presence of a train is indicated by the control device 2 superposing two signals on the transmission lii,a 7 to the beacon i.
The superposed signals comprise an AC voltage corresponding to the transmitted messages Mn and a DC bias on the transmission line corresponding to the indication of the presence of a train.
The AC voltage corresponding to the transmitted messages is not short-circuited by the beacon 1 and the messages can therefore be transmitted by the control ~device 2 to the on-board antenna 3 via the beacon i.
The beacon 1 connected to the control device 2 by St 15 the transmission line 7 comprises: a first interface 8 for alternating current Ssignals only, and a second interface 9 for direct currents only.
C The function of the first interface 8 for it' 20 alternating current signals only is to receive messages transmitted by the control device 2 destined to be read by the on-board antenna 3.
tl ~The functions of the second interface 9 for direct current only are to send the signal indicating the 25 presence of a train and to short-circuit the transmission line 7 for direct current only.
The system as described above implements a method of transmitting information Mn by means of a beacon 1 controlled by a control device 2.
The method of transmitting information Mn includes a first step in which the control device 2 superposes an AC voltage corresponding to the messages transmitted and a direct current on the transmission line 7 connecting the beacon 1 and the control device 2.
In a second step the second interface 9 applies a 8 short-circuit for direct current only to the transmission line 7 in response to receiving an indication 10 of the presence of the vehicle 5 near the beacon 1.
In the next step the control device 2 detects the short-circuit.
In a fourth step the control device 2 delays the changeover C between the messages Mn and the messages Mn+1 by transmitting one or more additional Mn messages Mns.
a.
a a :i Le 1 j i i r j i i e rn r i r
Claims (8)
1. Device for transmitting messages Mn to an on-board antenna on a vehicle by means of a beacon controlled by a control device adapted to effect i changeover C between said messages Mn and messages Mn+l wherein when said vehicle is near said beacon said control device delays said changeover C between said messages Mn and said messages Mn+l by transmitting one or more additional Mn messages Mns.
2. Device according to claim 1 wherein the control device superposes a direct current and an AC voltage corresponding to the '0 transmitted messages Mn on a transmission line connected to the beacon.
3. Device according to claim 1 or claim 2 wherein the changeover C is delayed on detection of the presence of said vehicle at the location of said beacon.
4. Beacon for use in devices for transmitting information connected to a control device by a transmission line, including means for transmitting to said control device a signal relating to the presence of a vehicle near said beacon. Vitt 6 5. Beacon according to claim 4 including: a first interface for alternating current signals only the function of which 20 is to receive messages transmitted by said control device and to transmit them so that an on-board antenna on a vehicle can read the messages Mn, a second interface for direct current only the functions of which are to transmit said signal relating to the presence of a vehicle near said beacon to •said control device and to short-circuit said transmission line for direct current only on receiving an indication of the presence of said vehicle near said Sbeacon. a o6. Method of transmitting information Mn by means of a beacon according to claim 4 or claim 5 including the following steps: superposition by said control device of a direct current and an AC voltage corresponding to said transmitted messages on said transmission line Ai connecting said beacon and said control device, 4 lii. ~DO CAWINWORMEULAMWO1(WO27O.DOC r- ^I short-circuiting said transmission line for direct current only by said second interface on reception by said second interface of an indication of the presence of said vehicle near said beacon, detection of the short-circuit by said control device, delaying said changeover C between said messages Mn and said messages Mn+1 by said control device transmitting one or more additional Mn messages Mns.
7. Device for transmitting messages substantially as herein described with reference to Figs. 3 and 4 of the accompanying drawings.
8. Beacon for use in devices for transmitting information substantially as herein described with reference to Figs. 3 and 4 of the accompanying drawings.
9. Method of transmitting information by means of a beacon substantially as herein described with reference to Figs. 3 and 4 of the accompanying drawings. DATED: 13 October, 1998 PHILLIPS ORMONDE FITZPATRICK *2 Attorneys for: 20 GEC ALSTHOM TRANSPORT SA statiC LUh C:WV1NWORDrUI"AmWORK
0270.DOC 7 0 ABSTRACT The present invention concerns a device for transmitting information Mn to an on-board antenna on a vehicle by means of a beacon controlled by a control device adapted to effect a changeover C between said messages Mn and messages Mn+1. The invention also concerns a beacon for use in an information transmission device and an information transmission method. 4t 04 I .44 44 4, 44 4,. 4 *4 4r 44 4 r* 44 n
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9410476 | 1994-08-31 | ||
| FR9410476A FR2724075B1 (en) | 1994-08-31 | 1994-08-31 | DEVICE AND METHOD FOR TRANSMITTING INFORMATION BY BEACONS AND BEACON USED IN SUCH A DEVICE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU3027095A AU3027095A (en) | 1996-03-14 |
| AU699130B2 true AU699130B2 (en) | 1998-11-26 |
Family
ID=9466601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU30270/95A Ceased AU699130B2 (en) | 1994-08-31 | 1995-08-28 | Method and device for transmitting information by means of beacons and beacon for use in a device of this kind |
Country Status (20)
| Country | Link |
|---|---|
| EP (1) | EP0699573B1 (en) |
| KR (1) | KR100344604B1 (en) |
| CN (1) | CN1135181C (en) |
| AT (1) | ATE167837T1 (en) |
| AU (1) | AU699130B2 (en) |
| BG (1) | BG62867B1 (en) |
| BR (1) | BR9503850A (en) |
| CZ (1) | CZ287266B6 (en) |
| DE (1) | DE69503200T2 (en) |
| DK (1) | DK0699573T3 (en) |
| ES (1) | ES2119334T3 (en) |
| FI (1) | FI107793B (en) |
| FR (1) | FR2724075B1 (en) |
| GR (1) | GR3027692T3 (en) |
| HU (1) | HU221080B1 (en) |
| NO (1) | NO310799B1 (en) |
| PL (1) | PL178868B1 (en) |
| RO (1) | RO114431B1 (en) |
| SK (1) | SK281145B6 (en) |
| ZA (1) | ZA957274B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1562304A1 (en) * | 2004-02-06 | 2005-08-10 | Siemens Schweiz AG | Data transmission method by means of field polarisation in near field transmission |
| US20070078574A1 (en) * | 2005-09-30 | 2007-04-05 | Davenport David M | System and method for providing access to wireless railroad data network |
| US20080042015A1 (en) * | 2006-08-15 | 2008-02-21 | Plawecki Daniel W | System and Method for Acquiring Position of Rolling Stock |
| FR3078310A1 (en) * | 2018-02-27 | 2019-08-30 | Alstom Transport Technologies | METHOD FOR CONTROLLING RAILWAY VEHICLES, DEVICE AND SYSTEM THEREOF |
| CN113844504B (en) * | 2021-08-31 | 2024-03-29 | 通号城市轨道交通技术有限公司 | Vehicle-mounted ATP control method and system |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2902238C2 (en) * | 1979-01-20 | 1986-07-24 | Standard Elektrik Lorenz Ag, 7000 Stuttgart | Device for train tail monitoring |
| JP2549385B2 (en) * | 1987-07-15 | 1996-10-30 | 日本信号株式会社 | Information transmission device |
| FR2640570B1 (en) * | 1988-12-21 | 1991-06-14 | Matra Transport | VEHICLE IDENTIFICATION DEVICE FOR TRANSPORTATION INSTALLATION |
-
1994
- 1994-08-31 FR FR9410476A patent/FR2724075B1/en not_active Expired - Fee Related
-
1995
- 1995-08-16 HU HU9502419A patent/HU221080B1/en not_active IP Right Cessation
- 1995-08-25 DK DK95401953T patent/DK0699573T3/en active
- 1995-08-25 AT AT95401953T patent/ATE167837T1/en not_active IP Right Cessation
- 1995-08-25 ES ES95401953T patent/ES2119334T3/en not_active Expired - Lifetime
- 1995-08-25 EP EP95401953A patent/EP0699573B1/en not_active Expired - Lifetime
- 1995-08-25 DE DE69503200T patent/DE69503200T2/en not_active Expired - Lifetime
- 1995-08-28 AU AU30270/95A patent/AU699130B2/en not_active Ceased
- 1995-08-28 FI FI954027A patent/FI107793B/en active
- 1995-08-29 BG BG99891A patent/BG62867B1/en unknown
- 1995-08-30 ZA ZA957274A patent/ZA957274B/en unknown
- 1995-08-30 CZ CZ19952216A patent/CZ287266B6/en not_active IP Right Cessation
- 1995-08-30 RO RO95-01539A patent/RO114431B1/en unknown
- 1995-08-30 PL PL95310230A patent/PL178868B1/en not_active IP Right Cessation
- 1995-08-30 KR KR1019950027501A patent/KR100344604B1/en not_active IP Right Cessation
- 1995-08-30 BR BR9503850A patent/BR9503850A/en not_active IP Right Cessation
- 1995-08-30 NO NO19953399A patent/NO310799B1/en not_active IP Right Cessation
- 1995-08-30 CN CNB951163019A patent/CN1135181C/en not_active Expired - Fee Related
- 1995-08-31 SK SK1080-95A patent/SK281145B6/en not_active IP Right Cessation
-
1998
- 1998-08-20 GR GR980401869T patent/GR3027692T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FI107793B (en) | 2001-10-15 |
| FR2724075B1 (en) | 1997-01-03 |
| NO953399L (en) | 1996-03-01 |
| EP0699573B1 (en) | 1998-07-01 |
| FI954027A (en) | 1996-03-01 |
| CN1135181C (en) | 2004-01-21 |
| CZ221695A3 (en) | 1996-03-13 |
| BG62867B1 (en) | 2000-09-29 |
| ES2119334T3 (en) | 1998-10-01 |
| DE69503200T2 (en) | 1999-01-07 |
| GR3027692T3 (en) | 1998-11-30 |
| ZA957274B (en) | 1996-04-04 |
| HU221080B1 (en) | 2002-07-29 |
| BG99891A (en) | 1996-04-30 |
| NO953399D0 (en) | 1995-08-30 |
| PL178868B1 (en) | 2000-06-30 |
| SK108095A3 (en) | 1996-04-03 |
| CN1127714A (en) | 1996-07-31 |
| FR2724075A1 (en) | 1996-03-01 |
| HU9502419D0 (en) | 1995-10-30 |
| BR9503850A (en) | 1996-09-17 |
| DK0699573T3 (en) | 1998-11-09 |
| PL310230A1 (en) | 1996-03-04 |
| AU3027095A (en) | 1996-03-14 |
| RO114431B1 (en) | 1999-04-30 |
| FI954027A0 (en) | 1995-08-28 |
| EP0699573A1 (en) | 1996-03-06 |
| KR100344604B1 (en) | 2006-03-27 |
| SK281145B6 (en) | 2000-12-11 |
| NO310799B1 (en) | 2001-08-27 |
| DE69503200D1 (en) | 1998-08-06 |
| ATE167837T1 (en) | 1998-07-15 |
| HUT73544A (en) | 1996-08-28 |
| CZ287266B6 (en) | 2000-10-11 |
| KR960008648A (en) | 1996-03-22 |
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