Classifications

• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
  • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
  • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
  • G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
• • 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
  • B61L3/125—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 short-range radio transmission
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
  • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
  • G06K7/0095—Testing the sensing arrangement, e.g. testing if a magnetic card reader, bar code reader, RFID interrogator or smart card reader functions properly
• • G—PHYSICS
  • G06—COMPUTING; CALCULATING OR COUNTING
  • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
  • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
  • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
  • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
  • G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
  • G06K7/10465—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being capable of self-diagnosis, e.g. in addition to or as part of the actual interrogation process
• • 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
  • B61L27/20—Trackside control of safe travel of vehicle or train, e.g. braking curve calculation
  • B61L2027/204—Trackside control of safe travel of vehicle or train, e.g. braking curve calculation using Communication-based Train Control [CBTC]

Definitions

• the present invention relates to a method for controlling the reading of at least one mobile transponder according to the preamble of claim 1.
• an electromagnetic disturbance for example an external electromagnetic field or a metal part close to the antenna
• an electromagnetic disturbance can prevent correct communication between the redundant interrogators and the transponders present at the antenna. their neighborhood.
• data from transponders can not be read reliably, even if several interrogators are associated in redundancy.
• An object of the present invention is to provide a method of reading control of at least one mobile transponder radio frequency relatively moving relative to an antenna of a reader of said transponder, said control for detecting defects in reading , especially in the presence of internal or external disturbances opposing the communication between the transponder and the reader.
• Another object of the present invention is to provide a simple installation for efficient implementation of said read control method.
• a set of subclaims also has advantages of the invention.
• At least one guaranteed reading zone is defined around the antenna
• At least one control transponder is fixed at the periphery of the guaranteed reading zone in order to periodically be read-controlled by the reader additionally to a reading of the mobile transponder.
• the guaranteed reading zone is defined such that in the immediate vicinity of the fixed antenna, said zone inside which the connection between the mobile transponder and the reader (via the antenna) is established. in a nominal way.
• the transponder relatively mobile antenna is present in this area, the correct reading of its data is guaranteed while reading the data of the transponder control is impossible, because inhibited by activation of that of the mobile transponder, it being transiently closer to the antenna than the control transponder.
• FIG. 1 Definition of zones including the guaranteed reading zone and principle of the method according to the invention
• FIG. 2 Redundancy of mobile transponders suitable for the method according to the invention in the case of a rail vehicle
• FIG. 4 Second example installation for the implementation of the ground transponder reading control method by means of an onboard reader according to the invention.
• Figure 1 illustrates the definition of areas including the guaranteed reading area and the principle of the method according to the invention.
• the said read control method aims at reading at least one mobile radio frequency transponder moving relatively relative to an antenna (ANT) of a reader (not shown) of said transponder.
• the transponder is moving
• At least one guaranteed reading area is defined in a limited perimeter around the antenna
• At least one control transponder is fixed at the periphery of the guaranteed reading area (ZLG) in order to periodically be read-controlled via the antenna by the reader in addition to a reading of the mobile transponder.
• Said method is thus based on the positioning of the radiofrequency-type control transponder placed near the antenna of each reader, the latter periodically interrogating the control transponder.
• the radio frequency data read from the transponder by the readers or interrogators are transmitted to at least one security computer connected to the interrogators.
• the control transponder or transponders contain at least one identifier that differentiates them from the mobile transponders to be read, that is to say the transponders carrying data whose reading is intended to be secure, these being mobile with respect to interrogators.
• control transponders have physical properties almost similar to those of mobile transponders so that, if an electromagnetic disturbance prevents the correct reading of the data of a mobile transponder passing in front of an interrogator, the same disturbance also prevents the correct reading of the data. transponder control data.
• the relative position of the control transponder with respect to the interrogator antenna is chosen so that:
• the electromagnetic coupling between the antenna / and the mobile transponder must be much better (-10 to 20 dB ) that the coupling between the antenna and the control transponder: the data of the mobile transponder are then correctly read while the reading of those of the control transponder becomes impossible.
• a second uncertainty zone (ZIl, ZI2) where no data reading of a mobile transponder with respect to the antenna is not guaranteed. This is usually due to electromagnetic interference between radio frequency emissions of mobile and control transponders (with similar physical properties);
• a third guaranteed control zone (ZCG1, ZCG2) for which no matter how many mobile transponders are present in this zone and if none of them are in one of the other two zones (ZLG, ZIl, ZI2), a single correct reading of the data of the control transponder is then guaranteed by the interrogator.
• each interrogator via its antenna periodically sends a query request to which must respond by transmitting their data to all transponders that receive it correctly.
• the interrogators thus transmit to a security computer, which periodically checks its validity, the data received from the transponders.
• control period (related to the reading of at least the control transponder) to be less than a minimum duration of passage or "overflight" of a mobile transponder in the guaranteed reading area.
• the reader is subjected to a periodic check under a control period less than a minimum transit time of the relatively mobile transponder in the warranty area. If this condition is fulfilled, as long as the computer receives correct data newly acquired from each interrogator at a period less than the minimum transit time, it can be advantageously guaranteed in safety that no operational mobile transponder has passed. without being “seen” by the interrogator in the guaranteed reading area.
• a period of interrogations (linked to the reader or interrogator itself) being ideally lower than the control period previously mentioned.
• the reader sends interrogation requests to the control transponder under a polling period less than the control period. If a transmission error tolerance must be respected, resulting in a finite number of successive queries without a usable response, the query period must be less than the control period divided by that finite number.
• each mobile transponder can be at least duplicated so that the object (such as a train) that carries them can not cross the zone. Guaranteed reading (ZLG) without being “seen” from the reader and therefore from the calculator. Two mobile transponders thus duplicated are also separated by a distance sufficient to not interfere with each other during a reading.
• FIG. 2 where the redundancy of mobile transponders is illustrated for the implementation of the method according to the invention in the case of a railway vehicle (1) such as a train (TR) or its vehicles. traveling in one train direction (SMT) on one track (VO).
• a mobile transponder (2) here embedded in the train (TR) is redundant with at least one other mobile transponder (3) in its vicinity being of course also embedded in the train (TR).
• transponders and interrogators it is possible to use transponders and interrogators according to a so-called multichannel method, whether they are frequency (different frequencies for mobile transponders and control transponders) or time (in different response time intervals for mobile transponders and control transponders). More specifically, at least one mobile transponder (2) and the control transponder on the channel (VO) are provided with a transmission in multiplexed form with separate transmission channels of the reader. Each of the transmissions between the mobile transponders and the reader is therefore qualitatively immovable.
• the redundancy of mobile transponders is also facilitated: by assigning different channels to redundant mobile transponders, they will not interfere either mutually and there is more to respect a minimum separation distance between them.
• the level of security may be a little worse than in the previous basic method because of the differences introduced between the two types of transponders: in some situations, the reading of the control transponders can be carried out correctly whereas that of mobile transponders can be disturbed. In the case of a multichannel frequency method for example, it can not be excluded that a fault of the interrogator affects some channels and not others, which could make possible the correct reading of the data of the control transponders, but not those of mobile transponders.
• this problem can be solved by associating an additional transponder with each mobile transponder (or each group of redundant mobile transponders).
• assigning the same channel to the additional mobile transponders as control transponders we thus advantageously find the level of security of the basic method while retaining the advantages of the multichannel process. We can therefore define this process of "mixed".
• the method according to the invention can provide for a multichannel method, that the mobile transponder (2) is redundant by means of at least one second mobile transponder (3) and being neighboring thereto and having a second channel. separate transmission of the mobile transponder channel (2) and the control transponder channel (TC - according to Figure 1).
• the multichannel method does not necessarily imply a redundancy of the mobile transponder: in principle, a mobile transponder having a different channel of the control transponder is sufficient, even if the interest is limited (its failures are not detected without redundancy) .
• the method according to the invention provides that at least one additional mobile transponder (5) is added in the vicinity of at least one mobile transponder (2, 3), said additional mobile transponder having a channel separate from the channel of said mobile transponder and identical to the channel of the control transponder.
• this latter therefore represents a vehicle (1) such as a train unit equipped with two groups of three transponders of the RFID and multichannel frequency type, a group at the front (AV) of the train, the other group at the rear (AR).
• the "before” group comprises two redundant mobile transponders (2, 3) respectively responding on two channels (on a first and a second frequency f1 and f2, not schematized) and an additional mobile transponder (5) responding on another channel supposed to a fourth frequency (f4, also non-schematized).
• the "back” group takes two redundant mobile transponders (22, 23) respectively responding on two channels respectively aligned on the second and third frequencies (f2, f3, non-schematized) and an additional mobile transponder (25) responding on the channel at the fourth frequency (f4 ).
• FIG. 3 represents a first example of an installation for implementing the method for controlling the reading of onboard transponders according to the invention, for which a vehicle (not shown) equipped with transponders as in FIG. 2 moves on a track portion (VO) such as a set of rails (RA), said track being equipped along its length with two interrogators (6, 16) each connected respectively to one of two antennas successively arranged on the ground (7, 17) for example between the rails (RA).
• Each of the antennas or by extension of the interrogators is respectively associated with one of two control transponders (4, 14) responding on the channel at the fourth frequency (f4) according to the example of Figure 2.
• the interrogators are connected to a calculator security (8, CALSEC) by means of an Ethernet type communication network (Eth).
• the group of transponders (2, 3, 5) of the front (AV) of the train is still far from the antenna (7), only the control transponder (4) can be read by it.
• the mobile transponder (3) arrives in the field of the antenna: a reading of the mobile transponders and control (3, 4) is possible.
• the additional mobile transponder (5) is in the uncertainty zone and mutually interferes with the control transponder (4) on their respective channel. at the fourth frequency (f4): thus, only the mobile transponder (3) can be read.
• the additional mobile transponder (5) arrives in its guaranteed reading area: thus, only the mobile transponder (3) and the additional mobile transponder (5) can be read.
• the mobile transponder (3) leaves the field of the antenna (7): only the additional mobile transponder (5) can be read.
• the additional transponder (5) is out of its guaranteed reading area, and interferes with the control transponder (4) on their common channel at the fourth frequency (f4): thus, only the mobile transponder (2 ) can be read.
• the additional transponder (5) is out of the field of the antenna (7), and its jamming with the control transponder (4) stops: thus, only, this mobile transponder (2) and the control transponder (4) can be read.
• the mobile transponder (2) leaves the field of the antenna: only the control transponder (4) can be read.
• a sequence of read steps can be obtained in the form of: ⁇ 4, 4 + 3, 4 + 3 + 2, 3 + 2, 3 + 2 +5, 3 + 2, 4 + 3 + 2, 4 + 2, 4 ⁇ , since these two mobile transponders (2, 3) transmit on distinct (mutually non-mutually interfering) channels and allow two-channel playback with one adapted reader.
• This redundancy thus makes it possible to raise the level of security of the reading control method. It is thus possible to obtain other advantageous sequences by slightly modifying the arrangement of the mobile transponders.
• FIGS. 4 and 5 represent a symmetrical arrangement with respect to the preceding examples according to FIGS. 2 and 3, in that a second example of installation is illustrated for implementing the ground transponder reading control method at means of an onboard reader according to the invention.
• the interrogator (36, INT), its antenna (37), its associated control transponder (34) and the computer (38, CALSEC) are now embedded in the vehicle (10), for example arranged under the floor of the vehicle, while the so-called “mobile” transponders (22, 23) and the additional mobile transponder (25) are placed on the ground for example between the rails (RA) of the track (VO).
• this second example is analogically identical for an implementation of the reading control method according to the invention described above and has the advantage that mobile transponders are actually mobile relative to the readers and its transponder. control.
• the method therefore has a very advantageous method for controlling readings of the ground-vehicle and ground-vehicle type with a high level of safety.
• the invention therefore advantageously provides an installation for implementing the method for controlling the reading of a mobile transponder in relative movement with respect to a transponder reader comprising a calculator connected to the reader and equipped with:
• an output signal delivering information of presence or of passage in a guaranteed reading zone of the mobile transponder transiting in said zone, for example while it is embedded in a vehicle and passes in front of a fixed reader on the ground.
• the reader and its control transponder are moving relative to the ground, for example as being loaded into a vehicle.
• the computer delivers a signal carrying two information of the pair formed by the mobile transponder and the control transponder according to a binary diagram of no vehicle or identification of a vehicle present.
• a plurality of readers may be disposed at ends of track yards and deliver signals ideally used to control a vehicle occupancy on said block and / or control a control of traffic lights or road actuators. They also provide secure redundancy when waiting for a defective drive replacement.

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• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Theoretical Computer Science (AREA)
• General Physics & Mathematics (AREA)
• Artificial Intelligence (AREA)
• Health & Medical Sciences (AREA)
• Computer Vision & Pattern Recognition (AREA)
• Toxicology (AREA)
• Biomedical Technology (AREA)
• General Health & Medical Sciences (AREA)
• Electromagnetism (AREA)
• Mechanical Engineering (AREA)
• Train Traffic Observation, Control, And Security (AREA)
• Electric Propulsion And Braking For Vehicles (AREA)
• Mobile Radio Communication Systems (AREA)

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• 2008
  • 2008-12-12 US US13/139,416 patent/US20110241841A1/en not_active Abandoned
  • 2008-12-12 EP EP08875633A patent/EP2359307A1/de not_active Withdrawn
  • 2008-12-12 BR BRPI0823308-0A patent/BRPI0823308A2/pt not_active IP Right Cessation
  • 2008-12-12 WO PCT/FR2008/001730 patent/WO2010066952A1/fr active Application Filing
  • 2008-12-12 KR KR1020117016079A patent/KR20110100647A/ko not_active Application Discontinuation
  • 2008-12-12 CN CN2008801327969A patent/CN102317950A/zh active Pending
  • 2008-12-12 CA CA2746683A patent/CA2746683A1/en not_active Abandoned
• 2009
  • 2009-12-10 TW TW098142182A patent/TW201101191A/zh unknown

Non-Patent Citations (1)

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