CN113184011B - Track circuit safety checking method and system - Google Patents
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- CN113184011B CN113184011B CN202110477872.7A CN202110477872A CN113184011B CN 113184011 B CN113184011 B CN 113184011B CN 202110477872 A CN202110477872 A CN 202110477872A CN 113184011 B CN113184011 B CN 113184011B
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- 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
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- 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
- B61L1/18—Railway track circuits
- B61L1/181—Details
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The application discloses a track circuit safety check method and a system, and the safety check method applied to a track circuit receiver comprises the following steps: the track circuit receiver receives a first safety check signal; the first safety check signal is a signal from a second safety check signal transmitted from the track circuit transmitter to the track circuit receiver; decoding the first security check signal received each time; comparing the decoded information with the current safety check information of the track circuit receiver; and counting the number of times of inconsistency between the decoded information and the current safety check information of the track circuit receiver, and sending alarm information when the number of times of inconsistency reaches a preset value in a preset time period. The track circuit safety checking method and system improve the safety and maintainability of the system.
Description
Technical Field
The present disclosure relates to the field of rail transit technologies, and in particular, to a method and a system for track circuit security check.
Background
The uninsulated track circuit is a key device of a train operation control system and is mainly used for realizing train occupancy check and ground train continuous information transmission. The working principle of the track circuit is as follows: the track circuit transmitter generates a frequency shift signal according to the coding control command, the frequency shift signal is received and decoded by the track circuit receiver through a signal transmission channel formed by equipment such as outdoor cables and steel rails, the track circuit receiver drives a track relay to work according to a decoding result, when a track section is free of vehicles and is idle, the decoded signal of the receiver is higher than a suction threshold, the track relay sucks up, and when the section from the rail is occupied by vehicles, the decoded signal of the receiver is lower than the suction threshold, and the track relay falls down.
However, the outdoor working environment of the track circuit is severe, and the track circuit is easily affected by various electromagnetic interferences due to the adoption of an electromagnetic characteristic transmission mechanism, and the electromagnetic interferences of the track circuit mainly include the following types:
(1) adjacent line interference
The adjacent line interference means that in different track lines arranged in parallel, frequency shift signals (namely frequency shift keying FSK signals) are mutually interfered due to electromagnetic coupling of track circuit signals of different lines.
(2) Neighbor segment interference
The adjacent section interference refers to mutual crosstalk of adjacent section frequency shift signals caused by insulation joint breakage or poor insulation in the same track line.
(3) Traction current interference
The interference of the traction power supply system of the electrified railway to the signal system comprises conductivity interference, static induction interference, space radiation interference and the like. The path of the conductive interference is represented by a conduction coupling path of traction current passing through a locomotive and a steel rail/ground, and unbalanced traction current generated in the steel rail influences track circuit signal equipment.
(4) Other faults
The track circuit has more cables, and the mixed line fault is easy to occur.
At present, an alarm mechanism is lacked after a track circuit is influenced by various electromagnetic interferences, the on-site inspection is difficult to be carried out due to the mixed fault of cables, and the system safety is possibly influenced by other electromagnetic interferences.
Disclosure of Invention
The application provides a track circuit safety checking method, which solves the problem that an alarm cannot be given when a frequency shift signal is subjected to electromagnetic interference, and improves the safety and maintainability of a system.
The application provides a track circuit safety checking method, which is applied to a track circuit receiver and comprises the following steps:
the track circuit receiver receives a first safety check signal in a timing mode; the first safety check signal is a signal from a second safety check signal transmitted from the track circuit transmitter to the track circuit receiver;
decoding the first security check signal; comparing the decoded information with the current safety check information of the track circuit receiver; and counting the number of times of inconsistency between the decoded information and the current safety check information of the track circuit receiver, and sending alarm information when the number of times of inconsistency reaches a preset value in a preset time period.
In an exemplary embodiment, the track circuit receiver current security check information includes a track circuit receiver current communication address.
In an exemplary embodiment, the current safety check information of the track circuit receiver is generated by:
encoding the current communication address of the track circuit receiver; and generating current safety check information of the track circuit receiver according to the encoded current communication address of the track circuit receiver.
In an exemplary embodiment, encoding a current communication address of a track circuit receiver includes:
encoding the current communication address of the track circuit receiver into a track circuit receiver address code, a first section of address code of the track circuit receiver and a second section of address code of the track circuit receiver; the communication address of the track circuit receiver is eight bits, the address code of the track circuit receiver is positioned in upper three bits, the first section of address code of the track circuit receiver is positioned in the three bits after the upper three bits, and the second section of address code of the track circuit receiver is positioned in the lower two bits;
generating current safety check information of the track circuit receiver according to the encoded current communication address of the track circuit receiver, wherein the current safety check information comprises the following steps:
and respectively expanding the address code of the track circuit receiver, the first section address code of the track circuit receiver and the first section address code of the track circuit receiver into eight bits, and adding a start bit and a check bit to generate the current safety check information of the track circuit receiver.
In an exemplary embodiment, the decoded information includes one of:
the sending end checks the information and the abnormal information;
the sending end safety check information comprises a sending end communication address.
The application provides a track circuit safety checking method, which is applied to a track circuit transmitter and comprises the following steps:
modulating according to the security check information of the sending end to generate a second security check signal;
and sending the second safety check signal to a track circuit receiver at fixed time.
In an exemplary embodiment, the sender security check information includes a sender communication address.
In an exemplary embodiment, the generating the second security check signal according to the modulation of the security check information at the transmitting end includes:
modulating the security check information of the sending end into a second security check signal according to the sequence of the low byte and the high byte in the security check information of the sending end from the low bit to the high bit respectively; 1 in the second security check signal represents a frequency shift keying FSK signal containing default carrier frequency and low-frequency information; 0 denotes an FSK signal containing carrier frequency reference and low frequency information.
The application provides a track circuit safety check system, includes track circuit sender and track circuit receiver, includes:
a track circuit receiver arranged to receive a first security check signal; the first safety check signal is a signal from a second safety check signal transmitted from the track circuit transmitter to the track circuit receiver; decoding the first security check signal; comparing the decoded information with the current safety check information of the track circuit receiver; counting the number of times of inconsistency between the decoded information and the current safety check information of the track circuit receiver, and sending alarm information when the number of times of inconsistency reaches a preset value within a preset time period;
the track circuit transmitter is arranged to generate a second safety check signal according to the safety check information modulation of the transmitting end; and sending the second safety check signal to a track circuit receiver at fixed time.
In an exemplary embodiment, the track circuit receiver current security check information includes a track circuit receiver current communication address.
According to the embodiment of the application, the information sent by the track circuit sending end and the receiving end checking information received by the track circuit receiving end are compared, and when the information and the receiving end checking information are inconsistent for many times within a preset time period, alarm information is sent out, so that the safety and the maintainability of the system are improved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. Other advantages of the present application may be realized and attained by the instrumentalities and combinations particularly pointed out in the specification and the drawings.
Drawings
The drawings are intended to provide an understanding of the present disclosure, and are to be considered as forming a part of the specification, and are to be used together with the embodiments of the present disclosure to explain the present disclosure without limiting the present disclosure.
FIG. 1 is a flow chart of a track circuit safety check method according to an embodiment of the present application;
FIG. 2 is a flow chart of a track circuit safety check method according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a track circuit security check system according to an embodiment of the present application;
Detailed Description
Fig. 1 is a schematic diagram of a track circuit safety check method according to an embodiment of the present application, and as shown in fig. 1, the track circuit safety check method according to the embodiment is applied to a track circuit receiver, and includes steps S11-S14:
s11, the track circuit receiver receives the first safety check signal at regular time;
s12, decoding the first safety check signal received each time;
s13, comparing the decoded information with the current safety check information of the track circuit receiver;
and S14, counting the number of times that the decoded information is inconsistent with the current safety check information of the track circuit receiver, and sending alarm information when the inconsistent number of times reaches a preset value in a preset time period.
The first safety check signal is a signal which is transmitted from the track circuit transmitter and reaches the track circuit receiver by the second safety check signal. The second safety check signal is formed by signal modulation of the track circuit sending end according to the sending end safety check information. Under normal conditions, the first safety check signal is the same as the second safety check signal, and if interference occurs in the transmission process of the second safety check signal, the first safety check signal is different from the second safety check signal.
In an exemplary embodiment, the current safety check information of the track circuit receiver may be generated by:
encoding the current communication address of the track circuit receiver; and generating current safety check information of the track circuit receiver according to the encoded current communication address of the track circuit receiver.
In an exemplary embodiment, encoding the current communication address of the track circuit receiver may include:
encoding the current communication address of the track circuit receiver into a receiving end address code, a first section of receiving end address code (namely receiving end section address code 1 in table 1) and a second section of receiving end address code (namely receiving end section address code 2 in table 1); the receiving end communication address is eight bits, the receiving end address code is located at the upper three bits, the first section of the receiving end address code is located at the three bits after the upper three bits, and the second section of the receiving end address code is located at the lower two bits.
For example, the format of the communication address of the receiving end is shown in table 1, where ADRx is 0 or ADRx is 1. The format of the communication address on the transmitting side is shown in table 2, and ADRx is 0 or ADRx is 1.
TABLE 1
TABLE 2
In an exemplary embodiment, generating the current safety check information of the track circuit receiver according to the encoded current communication address of the track circuit receiver may include, as shown in table 3: and respectively expanding the receiving end address code, the receiving end first section address code and the receiving end first section address code into eight bits, and adding a start bit and a check bit to generate the current safety check information of the track circuit receiver.
TABLE 3
In an exemplary embodiment, the decoded information includes one of:
the sending end checks the information and the abnormal information safely;
the sending end safety check information comprises a sending end communication address.
And under the conditions that the interference on a communication path between the sending end and the receiving end is small and the decoding is successful, the information obtained by decoding is the safety check information of the sending end. When the interference on the communication path between the transmitting end and the receiving end is large or the decoding fails, the information obtained by decoding is abnormal information (for example, check information of decoding errors).
The format of the security check information of the sending end is shown in table 4.
TABLE 4
In an exemplary embodiment, the sender security check information may include a sender communication address, and the local (i.e., track circuit receiver) current security check information may include a local (i.e., receiver: track circuit receiver) current communication address. The communication address of the sending end and the current communication address of the local end can be set in a dial mode, and the dial is located in the track circuit box. In the range of the track circuit section administered by the same station, the communication address of the sending end and the communication address of the receiving end have uniqueness. In general, the communication address of the transmitting end and the communication address of the receiving end are the same in the range of the track circuit section administered by the same station.
In some other embodiments, the security check information of the transmitting end and the current security check information of the track circuit receiver may be issued to the track circuit through a column control center. The safety check information issued by the train control center to the transmitting end of the track circuit needs to be the same as the safety check information issued to the receiving end of the track circuit.
In an exemplary embodiment, if the information obtained by decoding at the beginning of the device operation is consistent with the receiving end security check information, and later the information is inconsistent for a plurality of times, the probability of electromagnetic interference is higher. If the information obtained by starting the equipment operation and decoding is inconsistent with the receiving end safety check information, the mixed line fault or the dialing error probability is higher. The specific fault cause needs to be determined in combination with on-site troubleshooting.
According to the embodiment of the application, the information sent by the track circuit sending end and the receiving end checking information received by the track circuit receiving end are compared, and when the information and the receiving end checking information are inconsistent for many times in the preset time period, alarm information is sent out, so that the safety and the maintainability of the system are improved.
Fig. 2 is a flowchart of a track circuit safety check method according to an embodiment of the present application, and as shown in fig. 2, the track circuit safety check method according to the present embodiment is applied to a track circuit transmitter, and includes steps S21-S22:
s21, generating a second safety check signal according to the modulation of the safety check information of the sending end;
and S22, sending the second safety check signal to the track circuit receiver at regular time.
In an exemplary embodiment, the sender security check information may include a sender communication address. The communication address of the sending end can be set in a dial mode, and the dial is located in the track circuit box. Normally, the sender communication address and the receiver communication address are the same.
In other embodiments, the sending-end security check information may be security check information that is issued by the train control center to the track circuit sending end (i.e., the track circuit transmitter). Meanwhile, the train control center also sends the same safety check information to the receiving end of the track circuit (namely, the track circuit receiver) as the safety check information sent to the sending end of the track circuit.
In an exemplary embodiment, the sending-end security check information may be generated as follows:
encoding a transmitting end (i.e., track circuit transmitter) communication address; and generating the safety checking information of the sending end according to the coded communication address of the sending end.
In an exemplary embodiment, encoding the sender communication address may include:
encoding the communication address of the sending end into a sending end address code, a first section of address code of the sending end (namely a sending end section address code 1 in a table 1) and a second section of address code of the sending end (namely a sending end section address code 2 in the table 1); the communication address of the sending end is eight bits, the address code of the sending end is located in the upper three bits, the first section of address code of the sending end is located in the three bits after the upper three bits, and the second section of address code of the sending end is located in the lower two bits. For example, the format of the communication address of the transmitting end is shown in table 2.
In an exemplary embodiment, generating the sender security check information according to the encoded sender communication address may include, as shown in table 4: and respectively expanding the address code of the sending end, the first section of address code of the sending end and the first section of address code of the sending end into eight bits, and adding a start bit and a check bit to generate the safety check information of the sending end.
In an exemplary embodiment, the generating the second security check signal according to the modulation of the security check information at the sending end includes:
modulating the security check information of the sending end into a second security check signal according to the sequence of the low byte and the high byte in the security check information of the sending end from the low bit to the high bit respectively; 1 in the second security check signal represents a frequency shift keying FSK signal containing default carrier frequency and low-frequency information; 0 denotes an FSK signal containing carrier frequency reference and low frequency information. Wherein the default carrier frequency is-1 carrier frequency or-2 carrier frequency.
According to the embodiment of the application, the safety check information of the sending end sent by the track circuit sender and the safety check information of the receiving end per se received by the receiving end are compared, and when the sending end and the receiving end are inconsistent for many times in the preset time period, alarm information is sent out, so that the safety and the maintainability of the system are improved.
Fig. 3 is a schematic diagram of a track circuit security check system according to an embodiment of the present disclosure, and as shown in fig. 3, the security check system according to the present embodiment includes a track circuit transmitter and a track circuit receiver.
A track circuit receiver arranged to receive a first security check signal; the first safety check signal is a signal from a second safety check signal transmitted from the track circuit transmitter to the track circuit receiver; decoding the first security check signal received each time; comparing the decoded information with the current safety check information of the track circuit receiver; counting the number of times of inconsistency between the decoded information and the current safety check information of the track circuit receiver, and sending alarm information when the number of times of inconsistency reaches a preset value within a preset time period;
the track circuit transmitter is arranged to generate a second safety check signal according to the safety check information modulation of the transmitting end; and sending the second safety check signal to a track circuit receiver for multiple times.
In an exemplary embodiment, the sender security check information includes a sender communication address, and the track circuit receiver current security check information includes a track circuit receiver current communication address.
According to the embodiment of the application, the sending end checking information and the receiving end checking information sent by the track circuit sender and received by the receiving end are compared, and when the sending end checking information and the receiving end checking information are inconsistent for many times within a preset time period, the alarm information is sent out, so that the safety and the maintainability of the system are improved.
The present application describes embodiments, but the description is illustrative rather than limiting and it will be apparent to those of ordinary skill in the art that many more embodiments and implementations are possible within the scope of the embodiments described herein. Although many possible combinations of features are shown in the drawings and discussed in the detailed description, many other combinations of the disclosed features are possible. Any feature or element of any embodiment may be used in combination with, or instead of, any other feature or element in any other embodiment, unless expressly limited otherwise.
The present application includes and contemplates combinations of features and elements known to those of ordinary skill in the art. The embodiments, features and elements disclosed in this application may also be combined with any conventional features or elements to form a unique inventive concept as defined by the claims. Any feature or element of any embodiment may also be combined with features or elements from other inventive aspects to form yet another unique inventive aspect, as defined by the claims. Thus, it should be understood that any of the features shown and/or discussed in this application may be implemented alone or in any suitable combination. Accordingly, the embodiments are not to be restricted except in light of the attached claims and their equivalents. Furthermore, various modifications and changes may be made within the scope of the appended claims.
Further, in describing representative embodiments, the specification may have presented the method and/or process as a particular sequence of steps. However, to the extent that the method or process does not rely on the particular order of steps set forth herein, the method or process should not be limited to the particular sequence of steps described. Other orders of steps are possible as will be understood by those of ordinary skill in the art. Therefore, the particular order of the steps set forth in the specification should not be construed as limitations on the claims. Furthermore, the claims directed to the method and/or process should not be limited to the performance of their steps in the order written, and one skilled in the art can readily appreciate that the sequences may be varied and still remain within the spirit and scope of the embodiments of the present application.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those skilled in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
Claims (5)
1. A track circuit safety checking method is applied to a track circuit receiver and is characterized in that,
the track circuit receiver receives a first safety check signal; the first safety check signal is a signal of a second safety check signal transmitted from the track circuit transmitter reaching the track circuit receiver;
decoding the first security check signal received each time; comparing the decoded information with the current safety check information of the track circuit receiver; counting the number of times of inconsistency between the decoded information and the current safety check information of the track circuit receiver, and sending alarm information when the number of times of inconsistency reaches a preset value within a preset time period;
the current safety check information of the track circuit receiver comprises a current communication address of the track circuit receiver;
the current safety check information of the track circuit receiver is generated by the following method:
encoding the current communication address of the track circuit receiver; generating current safety check information of the track circuit receiver according to the coded current communication address of the track circuit receiver;
encoding a current communication address of a track circuit receiver, comprising:
encoding the current communication address of the track circuit receiver into a track circuit receiver address code, a first section of address code of the track circuit receiver and a second section of address code of the track circuit receiver; the current communication address of the track circuit receiver is eight bits, the address code of the track circuit receiver is positioned in the upper three bits, the first section of address code of the track circuit receiver is positioned in the three bits after the upper three bits, and the second section of address code of the track circuit receiver is positioned in the lower two bits;
generating current safety check information of the track circuit receiver according to the current communication address of the encoded track circuit receiver, wherein the method comprises the following steps:
and respectively expanding the address code of the track circuit receiver, the first section address code of the track circuit receiver and the second section address code of the track circuit receiver into eight bits, and adding a start bit and a check bit to generate the current safety check information of the track circuit receiver.
2. The security check method of claim 1, comprising:
the decoded information comprises one of:
the sending end checks the information and the abnormal information;
the sending end safety check information comprises a sending end communication address.
3. A track circuit safety check method is applied to a track circuit transmitter and is characterized in that,
modulating according to the security check information of the sending end to generate a second security check signal;
the second safety check signal is sent to a track circuit receiver in a timing mode;
the sending end safety check information is generated in the following mode: encoding a communication address of a sending end; generating sending end safety checking information according to the coded sending end communication address;
encoding a sender communications address, comprising: encoding the communication address of the sending end into a sending end address code, a first section of sending end address code and a second section of sending end address code; the communication address of the sending end is eight bits, the address code of the sending end is positioned at the upper three bits, the first section of address code of the sending end is positioned at the three bits after the upper three bits, and the second section of address code of the sending end is positioned at the lower two bits;
generating the safety checking information of the sending end according to the coded communication address of the sending end, comprising the following steps: and respectively expanding the address code of the sending end, the first section of address code of the sending end and the second section of address code of the sending end into eight bits, and adding a start bit and a check bit to generate the safety check information of the sending end.
4. The security check method according to claim 3, wherein generating the second security check signal according to the modulation of the security check information at the transmitting end comprises:
modulating the security check information of the sending end into a second security check signal according to the sequence of the low byte and the high byte in the security check information of the sending end from the low bit to the high bit respectively; 1 in the second security check signal represents a frequency shift keying FSK signal containing default carrier frequency and low frequency information; 0 denotes an FSK signal containing carrier frequency reference and low frequency information.
5. A track circuit security check system comprising a track circuit transmitter and a track circuit receiver, characterized by:
a track circuit receiver arranged to receive a first security check signal; the first safety check signal is a signal from a second safety check signal transmitted from the track circuit transmitter to the track circuit receiver; decoding the first security check signal received each time; comparing the decoded information with the current safety check information of the track circuit receiver; counting the number of times of inconsistency between the decoded information and the current safety check information of the track circuit receiver, and sending alarm information when the number of times of inconsistency reaches a preset value within a preset time period;
the track circuit transmitter is used for generating a second safety check signal according to the safety check information modulation of the transmitting end; sending the second safety check signal to a track circuit receiver for multiple times;
the current safety check information of the track circuit receiver comprises a current communication address of the track circuit receiver;
the current safety check information of the track circuit receiver is generated by the following method:
encoding the current communication address of the track circuit receiver; generating current safety check information of the track circuit receiver according to the coded current communication address of the track circuit receiver;
encoding a current communication address of a track circuit receiver, comprising:
encoding the current communication address of the track circuit receiver into a track circuit receiver address code, a first section of address code of the track circuit receiver and a second section of address code of the track circuit receiver; the current communication address of the track circuit receiver is eight bits, the address code of the track circuit receiver is positioned in the upper three bits, the first section of address code of the track circuit receiver is positioned in the three bits after the upper three bits, and the second section of address code of the track circuit receiver is positioned in the lower two bits;
generating current safety check information of the track circuit receiver according to the encoded current communication address of the track circuit receiver, wherein the current safety check information comprises the following steps:
and respectively expanding the address code of the track circuit receiver, the first section address code of the track circuit receiver and the second section address code of the track circuit receiver into eight bits, and adding a start bit and a check bit to generate the current safety check information of the track circuit receiver.
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| JP2004090870A (en) * | 2002-09-03 | 2004-03-25 | Mitsubishi Electric Corp | Track circuit transmission device |
| CN1588475A (en) * | 2004-10-11 | 2005-03-02 | 兰州大成自动化工程有限公司 | Digital phase sensitive rail circuit receiver |
| CN106184286A (en) * | 2016-09-09 | 2016-12-07 | 北京和利时系统工程有限公司 | A kind of frequency shift modulated track circuit system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009010907A1 (en) * | 2009-03-02 | 2010-09-16 | Siemens Aktiengesellschaft | Device for detecting the occupancy and free status of a track section and method for operating such a device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991011356A1 (en) * | 1990-01-25 | 1991-08-08 | Eb Signal Ab | Track circuit system |
| EP0513129A1 (en) * | 1990-01-25 | 1992-11-19 | Eb Signal Ab | Track circuit system. |
| JP2004090870A (en) * | 2002-09-03 | 2004-03-25 | Mitsubishi Electric Corp | Track circuit transmission device |
| CN1588475A (en) * | 2004-10-11 | 2005-03-02 | 兰州大成自动化工程有限公司 | Digital phase sensitive rail circuit receiver |
| CN106184286A (en) * | 2016-09-09 | 2016-12-07 | 北京和利时系统工程有限公司 | A kind of frequency shift modulated track circuit system |
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