EP1468891B1 - Méthode pour la augmentation du rapport signal/bruit par les systèmes de compteurs d'essieux - Google Patents

Méthode pour la augmentation du rapport signal/bruit par les systèmes de compteurs d'essieux Download PDF

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Publication number
EP1468891B1
EP1468891B1 EP03360046A EP03360046A EP1468891B1 EP 1468891 B1 EP1468891 B1 EP 1468891B1 EP 03360046 A EP03360046 A EP 03360046A EP 03360046 A EP03360046 A EP 03360046A EP 1468891 B1 EP1468891 B1 EP 1468891B1
Authority
EP
European Patent Office
Prior art keywords
signal
transmitter
noise
noisy
original
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.)
Expired - Lifetime
Application number
EP03360046A
Other languages
German (de)
English (en)
Other versions
EP1468891A1 (fr
Inventor
Kassen Oldewurtel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel CIT SA
Alcatel Lucent SAS
Original Assignee
Alcatel CIT SA
Alcatel SA
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 Alcatel CIT SA, Alcatel SA filed Critical Alcatel CIT SA
Priority to DE50300632T priority Critical patent/DE50300632D1/de
Priority to AT03360046T priority patent/ATE297338T1/de
Priority to EP03360046A priority patent/EP1468891B1/fr
Priority to ES03360046T priority patent/ES2242153T3/es
Publication of EP1468891A1 publication Critical patent/EP1468891A1/fr
Application granted granted Critical
Publication of EP1468891B1 publication Critical patent/EP1468891B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 train
    • B61L1/20—Safety arrangements for preventing or indicating malfunction of the device, e.g. by leakage current, by lightning
    • 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 train
    • B61L1/16—Devices for counting axles; Devices for counting vehicles
    • B61L1/167—Circuit details

Definitions

  • the invention relates to a method for increasing the signal-to-noise ratio Point of delivery of an axle counting system.
  • Each axle counter contains metering points with two rail contacts and one or more evaluation units.
  • Each axle counter monitors a track section assigned to it. detected the axle counter is a passing rail vehicle, the track section switched busy. Detects in the direction of travel of the rail vehicle nearest axle counter the passing rail vehicle, the Track section released again.
  • Electronic rail contacts often consist of two at one Mounted on the rail, spatially consecutive transmission coils, which are fed with audio frequency alternating currents and two on the each opposite rail side arranged with the Transmit coils inductively coupled receiver coils.
  • One send and one each Receiver coil together form a pulse generator.
  • the in the Receive coil induced voltages will be near the Rail contact arranged evaluation unit supplied and evaluated there.
  • the falling off and the phase rotation of the receiving voltages is due to the Coupling between the transmitting and receiving coils when passing a Vehicle wheel.
  • the induced voltages in the receiver coils are in implemented digital signals from which finally direction-dependent Counts are derived.
  • Prerequisite for proper operation of the electronic Rail contacts controlled axle counting systems is that of the Receiving coils passed to the evaluation Reception voltages in their amplitude not dependent on parameters are those who have nothing to do with the influence of the vehicle wheels.
  • interference fields can adversely affect the operation of the Impact rail contacts. This can be the case in particular if the sensors by interference fields, for example, by eddy current brakes be generated.
  • the object of the invention is to provide an improved method, with which makes the response of a rail contact more reliable is, in particular, independent of any outside one Radin influence lying, acting on the rail contact influences.
  • This object is achieved according to the invention by a method for increasing of the signal to noise ratio at points of delivery of an axle counting system in which sender side at least from a transmission signal an artificially noisy Signal is generated and the receiver side, the noisy signal in the original signal is converted for further processing.
  • the Receiver is known, in what way the transmission signal was noisy. Accordingly, the receiver side can be noisy Signal the original transmission signal to be reconstructed. An interference signal is the receiver is converted into a noise. So no meaningful signal are obtained. This noise can be filtered by be eliminated.
  • a noisy magnetic field is generated, from the receiving end, the original transmission signal is won.
  • a magnetic field with a noise character can be particularly simply by the with the noisy signal fed coil of a Rail contact can be generated.
  • the noisy (electrical) transmission signal So stimulates the transmitter coil.
  • the transmitter coil produces a noisy Send (magnet) field, which in turn received by a receiving coil becomes.
  • the transmitting coil with a magnetic field generated constant frequency which runs around the rail and that of the Receiver is evaluated according to amount and phase is according to the invention generates a magnetic field with a noise character from which through the Undoing the noise gained the original signal can be.
  • the noisy transmission signal has a larger bandwidth as the original transmission signal.
  • S / N signal-to-noise ratio
  • a Broadening the bandwidth by a factor of 10 would also become one Improve the S / N ratio by a factor of about 10. Due to the widening of the bandwidth and the transmission energy is on one distributed over a wider frequency range. This has a lower power density for Episode. The lower power density reduces the likelihood that the noisy signals disturb other narrowband signals. On the other hand will the noisy signal is less likely to pass through other narrowband signals disturbed because the noisy signal is integrated over a very wide bandwidth to restore the original signal.
  • the Center frequencies of the metering points typically at 27 kHz and 30 kHz and the bandwidth is about 100 Hz
  • the Bandwidth at constant center frequencies on, for example, about 1000 Hz to be widened.
  • the method according to the invention also allows the Using the same center frequency, for example, 28.5 kHz for both Rail contacts of a metering point. This can increase the bandwidth even further widened, e.g. at 4 kHz.
  • the Transmission signals of the two rail contacts with different noise be noisy.
  • the lower power density also has a positive effect on testing the electromagnetic compatibility (EMC tests), as in these Tests per frequency unit low power is required. Furthermore
  • EMC tests electromagnetic compatibility
  • the power consumption of a metering point is reduced. Because the metering points can often be powered over long distances, can For smaller power requirements, the maximum permissible cable length is increased become. With the same cable length, the power consumption in the Metering points are reduced.
  • the task is also performed by a counting point with at least one Rail contact solved, which has a transmitter and a receiver, wherein at least one modulation means for phase modulation at least one transmission signal is provided with a digital noise.
  • a counting point with at least one Rail contact solved, which has a transmitter and a receiver, wherein at least one modulation means for phase modulation at least one transmission signal is provided with a digital noise.
  • the send signal of a or several transmitters are phase modulated with a digital noise.
  • the modulation device can directly at the transmitter or on Rail contact be provided or arranged in the point of delivery.
  • the Modulation device advantageously comprises a noise generator and a mixer in which the transmit signal is phase modulated with the noise becomes.
  • the mixer signal ie the noisy transmission signal, can be amplified before it excites the transmitter coil.
  • the inventive Device is needed to generate the transmission signal no resonant circuit.
  • An evaluation unit can be arranged in the point of delivery. It is also conceivable that the evaluation unit is not integrated in the point of delivery and with this only in terms of data technology.
  • the receiver side a demodulation device for Demodulation of the noisy transmission signal provided.
  • the signal a second rail contact also phase modulated, so can also a Demodulations noticed be provided for this rail contact.
  • the transmitter is designed as a transmitting coil. This means that existing rail contacts are relatively easily converted can be. If a transmitter coil is used as the transmitter, then a Magnetic field with noise character generated.
  • At least one filter unit is provided. Interfering, by the receiving side Phasenumtastung or Demodulation can be converted into a noise by a Such filter device are particularly easy to filter, so that only "correct" signals are processed.
  • the filter unit can be used in the Evaluation unit or be arranged in the metering point. Is the evaluation unit in Counting point arranged, so is advantageously the filter unit in Point of delivery or arranged directly in the evaluation unit.
  • the invention also relates to an axle counting system comprising at least one includes the above-mentioned metering point.
  • axle counting system can the safety of rail transport will be increased significantly.
  • Fig. 1 shows a schematic diagram in a block diagram of a rail contact 1 of a counting point.
  • a rail 2 with a wheel rim 3 is shown schematically, the passing of a wheel rim 3 is to be detected by the rail contact 1.
  • On the left side of the Radkranzes 3 is the transmitter of the rail contact 1 and on the right side of the receiver of the rail contact 1.
  • the transmitter side two generators 4, 5 are provided, the generator 4 already provided in rail contacts of the prior art for generating the transmission signal is transmitted through the transmitting coil 6 .
  • the generator signal of the generator 4, the noise generated in the generator 5 is superimposed in a mixer 7 .
  • a digital noise (pseudo-noise) is generated.
  • the generator 5 and the mixer 7 represent a modulation device.
  • the signal at the output of the mixer 7 is amplified in the amplifier 8 .
  • the output signal of the amplifier 8 excites the transmitting coil 6.
  • the transmission signal is phase-modulated with a noise, in particular a digital noise, and a magnetic field with a noise character is generated by the transmission coil 6.
  • the phase-modulated transmission signal is detected by the receiver coil 9 and amplified in the amplifier 10 .
  • the received signal is demodulated.
  • the demodulation device 11 is supplied with the output signal of the mixer 7. This makes it possible for the demodulation device 11 to determine the original transmitted signal from the received noisy signal. However, a meaningful signal can not be generated from an interfering signal.
  • the demodulation device 11 only noise is generated from a noise signal, which is filtered out in filter devices, not shown, for example, a low-pass filter. Furthermore, a comparator 12 is provided which detects the zero crossing of the demodulated signal. Although in the block diagram, the generators 4, 5 and the mixer 7 are shown on the receiver side, they can also be arranged in a metering point.
  • the transmitter at least one transmission signal artificially noisy signal generated and the receiver side the noisy Signal converted to the original signal for further processing. Transmit signals can be uniquely identified in this way while Noise at the receiver-side conversion converted to noise become.

Landscapes

  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Mechanical Engineering (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Near-Field Transmission Systems (AREA)
  • Measuring Magnetic Variables (AREA)
  • Measurement Of Radiation (AREA)
  • Dc Digital Transmission (AREA)
  • Train Traffic Observation, Control, And Security (AREA)

Claims (10)

  1. Procédé pour l'augmentation du rapport signal/bruit aux points de comptage d'un système de comptage d'essieux, avec lequel, pour au moins un contact de rail (1) d'un point de comptage, on génère côté émetteur à partir d'un signal émission un signal perturbé artificiellement et côté émetteur le bruit perturbé est converti dans le signal d'origine pour le traitement ultérieur.
  2. Procédé selon la revendication 1, caractérisé en ce que côté émetteur on génère un champ magnétique perturbé, à partir duquel on obtient côté récepteur le signal d'émission d'origine.
  3. Procédé selon la revendication 1, caractérisé en ce que le signal perturbé a une largeur de bande plus grande que le signal d'origine.
  4. Procédé selon la revendication 1, caractérisé en ce que le signal d'émission d'origine est modulé en phase avec un bruit numérique.
  5. Procédé selon la revendication 4, caractérisé en ce que le signal d'émission d'origine est modulé en phase de 180° avec le bruit numérique.
  6. Point de comptage comprenant au moins un contact de rail (1), qui présente un émetteur et un récepteur, caractérisé en ce qu'au moins un appareil de modulation (5, 7) est prévu pour la modulation en phase d'au moins un signal d'émission avec un bruit numérique.
  7. Procédé selon la revendication 6, caractérisé en ce que côté émetteur un appareil de démodulation (11) est prévu pour la démodulation du signal d'émission perturbé.
  8. Point de comptage selon la revendication 6, caractérisé en ce qu'une bobine d'émission (6) est prévue côté émetteur.
  9. Point de comptage selon la revendication 6, caractérisé en ce qu'au moins un système de filtre est prévu côté récepteur.
  10. Système de comptage d'essieux, qui comprend au moins un point de comptage selon la revendication 6.
EP03360046A 2003-04-14 2003-04-14 Méthode pour la augmentation du rapport signal/bruit par les systèmes de compteurs d'essieux Expired - Lifetime EP1468891B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE50300632T DE50300632D1 (de) 2003-04-14 2003-04-14 Verfahren zur Erhöhung des Störabstands bei Zählpunkten eines Achszählsystems
AT03360046T ATE297338T1 (de) 2003-04-14 2003-04-14 Verfahren zur erhöhung des störabstands bei zählpunkten eines achszählsystems
EP03360046A EP1468891B1 (fr) 2003-04-14 2003-04-14 Méthode pour la augmentation du rapport signal/bruit par les systèmes de compteurs d'essieux
ES03360046T ES2242153T3 (es) 2003-04-14 2003-04-14 Metodo para aumentar la relacion señal/ruido de sistemas para contar ejes.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03360046A EP1468891B1 (fr) 2003-04-14 2003-04-14 Méthode pour la augmentation du rapport signal/bruit par les systèmes de compteurs d'essieux

Publications (2)

Publication Number Publication Date
EP1468891A1 EP1468891A1 (fr) 2004-10-20
EP1468891B1 true EP1468891B1 (fr) 2005-06-08

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EP03360046A Expired - Lifetime EP1468891B1 (fr) 2003-04-14 2003-04-14 Méthode pour la augmentation du rapport signal/bruit par les systèmes de compteurs d'essieux

Country Status (4)

Country Link
EP (1) EP1468891B1 (fr)
AT (1) ATE297338T1 (fr)
DE (1) DE50300632D1 (fr)
ES (1) ES2242153T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101939201B (zh) * 2008-02-04 2013-05-15 西门子公司 用于提高车轮传感器的抗干扰性的方法以及用于执行该方法的车轮传感器

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE502005000732D1 (de) * 2005-01-31 2007-06-28 Alcatel Transp Solution D Gmbh Verfahren zum Einstellen einer Ausgangsspannung einer Empfangsschaltung eines Empfangskopfes eines Schienenkontakts und Schienenkontaktsystem
CN105966420B (zh) * 2016-06-15 2017-11-17 湖南工业大学 道轨车轮传感装置
CN109727447B (zh) * 2016-06-15 2021-09-07 湖南工业大学 机车速度检测信号过滤方法
CN105946899B (zh) * 2016-06-15 2017-11-03 湖南工业大学 车轴计轴传感装置
DE102021209644A1 (de) * 2021-09-02 2023-03-02 Siemens Mobility GmbH Sensoreinrichtung, Anordnung und Verfahren zum Erfassen einer Änderung eines Magnetfeldes
CN115923869B (zh) * 2023-01-31 2024-07-23 北京安润通电子技术开发有限公司 一种具备断轨检测功能的计轴***及使用方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3307689C2 (de) * 1983-03-04 1984-12-20 Standard Elektrik Lorenz Ag, 7000 Stuttgart Schaltungsanordnung zum Betrieb eines induktiv arbeitenden Schienenkontakts
GB2149275B (en) * 1983-10-26 1987-01-21 Standard Telephones Cables Ltd Identity card recognition system
DE19709840C2 (de) * 1997-02-28 2001-10-04 Siemens Ag Einrichtung für die Achszählung zum Unterscheiden von Radbeeinflussungen und Nicht-Radbeeinflussungen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101939201B (zh) * 2008-02-04 2013-05-15 西门子公司 用于提高车轮传感器的抗干扰性的方法以及用于执行该方法的车轮传感器

Also Published As

Publication number Publication date
EP1468891A1 (fr) 2004-10-20
ATE297338T1 (de) 2005-06-15
ES2242153T3 (es) 2005-11-01
DE50300632D1 (de) 2005-07-14

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