CN113978519A - Beidou time synchronization method and system for rail transit train operation control system - Google Patents
Beidou time synchronization method and system for rail transit train operation control system Download PDFInfo
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- CN113978519A CN113978519A CN202111474456.8A CN202111474456A CN113978519A CN 113978519 A CN113978519 A CN 113978519A CN 202111474456 A CN202111474456 A CN 202111474456A CN 113978519 A CN113978519 A CN 113978519A
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
Abstract
The invention discloses a Beidou time synchronization method and a Beidou time synchronization system for a rail transit train operation control system, wherein the Beidou time synchronization method comprises the following steps: carrying out overall time service on the train operation control ground subsystem according to the Beidou time signal; carrying out synchronous time service on the train operation control vehicle-mounted subsystem according to the Beidou time signal; and the train operation control vehicle-mounted subsystem transmits the train time to the train operation control ground subsystem, and the train operation control ground subsystem checks and adjusts the station equipment time based on the train time. By adopting the technical scheme of the invention, the problem of time synchronization between the mobile train and the ground station in the running process of the rail transit train is solved.
Description
Technical Field
The invention belongs to the technical field of rail transit time synchronization, and particularly relates to a Beidou time synchronization method and a Beidou time synchronization system for a rail transit train operation control system.
Background
Time synchronization is an urgent need for maintenance and management of a rail transit communication system, and by performing time synchronization on module equipment such as information transmission, service application and time display, functions such as high-precision standard time display, network performance analysis and fault tracing and positioning can be realized, so that safety guarantee is provided for operation management and scheduling overall planning of rail transit.
The rail transit time synchronization network comprises a ground time synchronization network and a mobile train time synchronization node. The ground Time synchronization Network comprises three-level Time synchronization nodes which are respectively arranged at a dispatching center of a rail transit main company and each dispatching center of a rail transit bureau and each station, section and station along the rail transit, and long-distance Time signal transmission between the three-level Time synchronization nodes is realized by optical fibers and NTP (Network Time Protocol). At present, the rail transit time synchronization network in China is still under construction, and the time synchronization application of a large-range and full-coverage rail transit vehicle ground cannot be realized. The existing research generally carries out research and modeling simulation on a ground time synchronization network and a mobile train time synchronization node respectively, has less relevant research on train-ground time synchronization, and does not consider the influence of time deviation between the ground time synchronization network and the mobile train time synchronization node on train operation control.
Along with the overall speed increase of the rail transit network, the time synchronization precision requirement of the train operation control system on the train-ground equipment is also improved, and when the local surface transmits a driving command to the train, the time consistency between the train-ground equipment is of great importance. In addition, when a fault occurs, if the time among subsystems of train operation control is not synchronous, the interference on the judgment of the fault occurrence sequence can be caused, even the error analysis can be caused, the train running efficiency is influenced, and the potential safety hazard is caused.
Disclosure of Invention
The invention aims to provide a Beidou time synchronization method and a Beidou time synchronization system for a rail transit train operation control system, and solves the problem of time synchronization between a mobile train and a ground station in the operation process of the rail transit train.
In order to achieve the purpose, the invention adopts the following technical scheme:
a Beidou time synchronization method for a rail transit train operation control system comprises the following steps:
s1, carrying out overall time service on the train operation control ground subsystem according to the Beidou time signal;
step S2, carrying out synchronous time service on the train operation control vehicle-mounted subsystem according to the Beidou time signal;
and step S3, the train operation control vehicle-mounted subsystem transmits the train time to the train operation control ground subsystem, and the train operation control ground subsystem checks and adjusts the station equipment time based on the train time.
Preferably, the train operation control ground subsystem comprises a radio block center; and the obtained Beidou time signal of the Beidou third satellite system is used for carrying out time service on the radio block center, and the radio block center transmits the time signal to other equipment of the train operation control ground subsystem, so that the overall time service of the train operation control ground subsystem is realized.
Preferably, the train operation control vehicle-mounted subsystem comprises: a vehicle-mounted security computer; and the obtained Beidou time signal of the Beidou third satellite system is used for carrying out time service on the vehicle-mounted safety computer, and then the vehicle-mounted safety computer transmits the time signal to other equipment of the train operation control vehicle-mounted subsystem, so that synchronous time service of the train operation control vehicle-mounted subsystem and the train operation control ground subsystem is realized.
Preferably, when the train is running at the station, the wireless communication vehicle-mounted device of the train running control vehicle-mounted subsystem transmits the train time to the wireless communication ground device of the train running control ground subsystem, and the wireless ground device transmits the train time to the wireless blocking center, the wireless blocking center performs time calibration of the ground subsystem based on the train time, and transmits the calibrated time to other devices of the train running control ground subsystem, so that time synchronization of the train and the ground is realized.
Preferably, the wireless communication vehicle-mounted equipment and the wireless communication ground equipment realize bidirectional information transmission through a GSM-R system.
The invention also provides a Beidou time synchronization system of the rail transit train operation control system, which comprises the following steps: the system comprises a train operation control ground subsystem, a train operation control vehicle-mounted subsystem and a Beidou third satellite system;
the Beidou third satellite system is used for providing a Beidou high-precision time signal;
the train operation control ground subsystem is used for carrying out overall time service based on the Beidou high-precision time signal;
the train operation control vehicle-mounted subsystem is used for carrying out synchronous time service based on the Beidou high-precision time signal;
the train operation control ground subsystem checks and adjusts the station equipment time based on the train time.
Preferably, the train operation control ground subsystem comprises a radio block center, the radio block center carries out time service according to the acquired Beidou time signal of the Beidou satellite system III, and meanwhile, the time signal is transmitted to other equipment of the train operation control ground subsystem, so that the overall time service of the train operation control ground subsystem is realized.
Preferably, the train operation control vehicle-mounted subsystem comprises: and the vehicle-mounted safety computer is used for carrying out time service according to the acquired Beidou time signal of the Beidou third satellite system and simultaneously transmitting the time signal to other equipment of the train operation control vehicle-mounted subsystem, so that synchronous time service of the train operation control vehicle-mounted subsystem and the train operation control ground subsystem is realized.
Preferably, the train operation control vehicle-mounted subsystem and the train operation control ground subsystem realize bidirectional information transmission through a GSM-R system.
According to the invention, the Beidou signal receiver is installed at the third-level time synchronization node of the rail transit, and the time service of station equipment is completed directly based on the Beidou time signal. Meanwhile, the Beidou high-precision time signals and the time signals transmitted by the ground first-stage time synchronization node and the ground second-stage time synchronization node form redundancy, and the reliability of the rail transit ground time synchronization network is improved.
The high-precision time synchronization of all stations along the rail transit line based on a unified time source is realized while the train moves. The train time is taken as a standard time source, when a train passes through a station, forced time synchronization is carried out on a train operation control vehicle-mounted subsystem and a ground subsystem which receive time signals of different time sources, all station time along the line is synchronized in the advancing process, and the time synchronization of the whole rail transit system is realized.
Drawings
FIG. 1 is a flow chart of a Beidou time synchronization method of a rail transit train operation control system;
FIG. 2 is a schematic diagram of train operation control system time synchronization;
FIG. 3 is a schematic diagram of a rail transit vehicle ground time synchronization system;
fig. 4 is a structural diagram of a Beidou time synchronization system of a rail transit train operation control system.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Example 1:
as shown in fig. 1 and 2, the invention provides a Beidou time synchronization method for a rail transit train operation control system, which comprises the following steps:
s1, carrying out overall time service on the train operation control ground subsystem according to the Beidou time signal;
step S2, carrying out synchronous time service on the train operation control vehicle-mounted subsystem according to the Beidou time signal;
and step S3, the train operation control vehicle-mounted subsystem transmits the train time to the train operation control ground subsystem, and the train operation control ground subsystem checks and adjusts the station equipment time based on the train time.
As an implementation mode in the embodiment of the invention, a Beidou signal receiver provided with a time service type antenna is installed in a ground station of a third-level time synchronization node of rail transit, and a high-precision time signal from a Beidou third satellite system is received; and time service is carried out on the ground subsystem for controlling the train operation in the station, and then the ground subsystem transmits the time signal to signal equipment of other functional modules in the station, so that the overall time service of the ground station is completed.
Further, as shown in fig. 3, the train operation control ground subsystem includes: the system comprises a wireless block center, point type equipment, a track circuit and wireless communication ground equipment, wherein the point type equipment, the track circuit and the wireless communication ground equipment are respectively connected with the wireless block center, and the wireless block center is used as the core of a ground subsystem and is provided with a communication interface connected with other equipment. The station is internally provided with a Beidou signal receiver provided with a time service type antenna, the received Beidou time signal is used for time service to the radio block center, and then the radio block center transmits the time signal to other equipment of the ground subsystem, so that the time service of the ground subsystem is realized.
As an implementation mode in the embodiment of the invention, a Beidou signal receiver provided with a time service type antenna is also installed on the mobile train, and receives a high-precision time signal from a Beidou satellite system III. The Beidou high-precision time signal is used for timing the train operation control vehicle-mounted subsystem on the mobile train, and then the vehicle-mounted subsystem transmits the time signal to signal equipment of other functional modules on the train to complete the overall timing of the mobile train.
Further, as shown in fig. 3, the train operation control onboard subsystem includes: the system comprises a vehicle-mounted safety computer, a point type information receiving module, a speed measuring module, an equipment maintenance recording unit, an operation management recording unit and wireless communication vehicle-mounted equipment, wherein the vehicle-mounted safety computer is used as the core of a vehicle-mounted subsystem and is provided with a communication interface connected with other equipment. The Beidou signal receiver with the time service type antenna is arranged on the mobile train, the received time signal is used for time service on the vehicle-mounted safety computer, and then the time signal is transmitted to other equipment of the train operation control vehicle-mounted subsystem by taking the vehicle-mounted safety computer as a center, so that synchronous time service of the train operation control vehicle-mounted subsystem and the train operation control ground subsystem is realized.
As an implementation manner in the embodiment of the present invention, the train operation control vehicle-mounted subsystem performs information interaction such as train position, speed, operation state, driving permission, and the like with the train operation control ground subsystem of the ground station in a wireless communication manner. In the process, the train time is transmitted to the ground subsystem by the vehicle-mounted subsystem, and the ground subsystem checks and adjusts the station equipment time based on the train time. And the train-ground time synchronization of the whole line is completed along with the running of the train.
Further, as shown in fig. 3, the wireless communication vehicular device of the train operation control vehicular subsystem and the wireless communication ground device of the train operation control ground subsystem realize bidirectional information transmission through a GSM-R system; when the train runs to the station, the wireless communication vehicle-mounted equipment transmits the train time to the wireless communication ground equipment, the ground equipment transmits the train time to the wireless block center, the wireless block center carries out time calibration of the ground subsystem based on the train time, then transmits the calibrated time to other ground equipment, and finally achieves train-ground time synchronization.
The invention has the following beneficial effects:
(1) in most researches, a traditional rail transit time synchronization network architecture is still reserved, a station autonomous time signal receiving device is not considered to be arranged at a ground third-level time synchronization node, but a time signal transmitted by a superior time synchronization node in a long distance is relied on, so that an accumulated error of the time signal in a transmission process can be caused, the high precision of the time of station key signal equipment can not be ensured, and the safety of a train operation control system is reduced. In the method, the error of the station time signal based on the Beidou high-precision time service system can be controlled within 20 nanoseconds, so that the safety of the operation control system is improved, and the reliability of the operation control system is improved by forming a redundant backup time service system by the Beidou time signal and a ground superior time synchronization node signal.
(2) The invention utilizes wireless communication to realize train time signal transmission from the train operation control vehicle-mounted subsystem to the ground subsystem, and can adopt methods of automatic frequency selection control algorithm, standard time train selection and the like to eliminate and compensate aiming at errors generated by Doppler effect in a high-speed mobile communication network, thereby theoretically realizing train-ground time synchronization precision of 0.1 millisecond level of the operation control system.
(3) The invention can realize time synchronization for all stations along the advancing line of the train, eliminates time isolation caused by space isolation, and has high reliability and high safety.
The invention realizes the functions of ground station time service, mobile train time service and train-ground time synchronization in the train operation through the train operation control vehicle-mounted subsystem, the train operation control ground subsystem and the Beidou third satellite system, and is suitable for the rail transit train operation control system at different operation speeds such as common speed, high speed, magnetic suspension and the like.
Example 2:
as shown in fig. 4, the invention further provides a big dipper time synchronization system of a rail transit train operation control system, which includes: the system comprises a train operation control ground subsystem, a train operation control vehicle-mounted subsystem and a Beidou third satellite system;
the Beidou third satellite system is used for providing a Beidou high-precision time signal;
the train operation control ground subsystem is used for carrying out overall time service based on the Beidou high-precision time signal;
the train operation control vehicle-mounted subsystem is used for carrying out synchronous time service based on the Beidou high-precision time signal;
the train operation control ground subsystem checks and adjusts the station equipment time based on the train time.
As an implementation manner in the embodiment of the invention, the train operation control ground subsystem comprises a radio block center, and the radio block center performs time service according to the acquired Beidou time signal of the Beidou satellite system III and transmits the time signal to other equipment of the train operation control ground subsystem at the same time, so that the overall time service of the train operation control ground subsystem is realized.
As an implementation manner in the embodiment of the present invention, the train operation control on-board subsystem includes: and the vehicle-mounted safety computer is used for carrying out time service according to the acquired Beidou time signal of the Beidou third satellite system and simultaneously transmitting the time signal to other equipment of the train operation control vehicle-mounted subsystem, so that synchronous time service of the train operation control vehicle-mounted subsystem and the train operation control ground subsystem is realized.
As an implementation mode in the embodiment of the invention, the train operation control vehicle-mounted subsystem and the train operation control ground subsystem realize bidirectional information transmission through a GSM-R system. And the train operation control vehicle-mounted subsystem and the train operation control ground subsystem of the ground station perform information interaction such as train position, speed, operation state, driving permission and the like.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a rail transit train operation control system big dipper time synchronization method which characterized in that includes:
s1, carrying out overall time service on the train operation control ground subsystem according to the Beidou time signal;
step S2, carrying out synchronous time service on the train operation control vehicle-mounted subsystem according to the Beidou time signal;
and step S3, the train operation control vehicle-mounted subsystem transmits the train time to the train operation control ground subsystem, and the train operation control ground subsystem checks and adjusts the station equipment time based on the train time.
2. The rail transit train operation control system Beidou time synchronization method according to claim 1, wherein the train operation control ground subsystem comprises a radio block center; and the obtained Beidou time signal of the Beidou third satellite system is used for carrying out time service on the radio block center, and the radio block center transmits the time signal to other equipment of the train operation control ground subsystem, so that the overall time service of the train operation control ground subsystem is realized.
3. The rail transit train operation control system Beidou time synchronization method of claim 1, wherein the train operation control vehicle-mounted subsystem comprises: a vehicle-mounted security computer; and the obtained Beidou time signal of the Beidou third satellite system is used for carrying out time service on the vehicle-mounted safety computer, and then the vehicle-mounted safety computer transmits the time signal to other equipment of the train operation control vehicle-mounted subsystem, so that synchronous time service of the train operation control vehicle-mounted subsystem and the train operation control ground subsystem is realized.
4. The method for time synchronization of the Beidou of the railway transportation train operation control system as claimed in claim 1, wherein when the train operation approaches the station, the wireless communication vehicular equipment of the train operation control vehicular subsystem transmits the train time to the wireless communication ground equipment of the train operation control ground subsystem, and the wireless ground equipment transmits the train time to the wireless block center, and the wireless block center performs time calibration of the ground subsystem based on the train time and then transmits the calibrated time to other equipment of the train operation control ground subsystem to achieve time synchronization of the train and the ground.
5. The rail transit train operation control system Beidou time synchronization method according to claim 4, wherein the wireless communication vehicle-mounted device and the wireless communication ground device realize bidirectional information transmission through a GSM-R system.
6. The utility model provides a track traffic train operation control system big dipper time synchronization system which characterized in that includes: the system comprises a train operation control ground subsystem, a train operation control vehicle-mounted subsystem and a Beidou third satellite system;
the Beidou third satellite system is used for providing a Beidou high-precision time signal;
the train operation control ground subsystem is used for carrying out overall time service based on the Beidou high-precision time signal;
the train operation control vehicle-mounted subsystem is used for carrying out synchronous time service based on the Beidou high-precision time signal;
the train operation control ground subsystem checks and adjusts the station equipment time based on the train time.
7. The rail transit train operation control system Beidou time synchronization system of claim 6, wherein the train operation control ground subsystem comprises a radio block center, the radio block center carries out time service according to the acquired Beidou time signal of the Beidou third satellite system, and meanwhile, the radio block center transmits the time signal to other equipment of the train operation control ground subsystem, so that the overall time service of the train operation control ground subsystem is realized.
8. The rail transit train operation control system beidou time synchronization system of claim 6, wherein the train operation control vehicle-mounted subsystem comprises: and the vehicle-mounted safety computer is used for carrying out time service according to the acquired Beidou time signal of the Beidou third satellite system and simultaneously transmitting the time signal to other equipment of the train operation control vehicle-mounted subsystem, so that synchronous time service of the train operation control vehicle-mounted subsystem and the train operation control ground subsystem is realized.
9. The rail transit train operation control system beidou time synchronization system of claim 6, wherein the train operation control vehicle-mounted subsystem and the train operation control ground subsystem realize bidirectional information transmission through a GSM-R system.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100322267A1 (en) * | 2007-11-30 | 2010-12-23 | Mitsubishi Electric Corporation | Time synchronization system and time synchronization method in train |
| CN102390410A (en) * | 2011-06-23 | 2012-03-28 | 中国北车股份有限公司大连电力牵引研发中心 | Vehicle monitoring system based on Beidou system and control method thereof |
| EP2548784A2 (en) * | 2011-07-20 | 2013-01-23 | Hitachi Ltd. | Train control system |
| CN104734769A (en) * | 2015-03-31 | 2015-06-24 | 中铁工程设计咨询集团有限公司 | Ground equipment system based on Beidou Satellite time service signals |
| CN110850707A (en) * | 2019-10-17 | 2020-02-28 | 北京全路通信信号研究设计院集团有限公司 | Satellite time service-based time keeping method and system |
| CN112339792A (en) * | 2020-11-10 | 2021-02-09 | 北京天润海图科技有限公司 | Intelligent personal rapid transportation system based on communication control |
| CN113562023A (en) * | 2021-08-29 | 2021-10-29 | 陈建明 | Communication-based train operation control method with train positioning and integrity judgment |
-
2021
- 2021-12-03 CN CN202111474456.8A patent/CN113978519A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100322267A1 (en) * | 2007-11-30 | 2010-12-23 | Mitsubishi Electric Corporation | Time synchronization system and time synchronization method in train |
| CN102390410A (en) * | 2011-06-23 | 2012-03-28 | 中国北车股份有限公司大连电力牵引研发中心 | Vehicle monitoring system based on Beidou system and control method thereof |
| EP2548784A2 (en) * | 2011-07-20 | 2013-01-23 | Hitachi Ltd. | Train control system |
| CN104734769A (en) * | 2015-03-31 | 2015-06-24 | 中铁工程设计咨询集团有限公司 | Ground equipment system based on Beidou Satellite time service signals |
| CN110850707A (en) * | 2019-10-17 | 2020-02-28 | 北京全路通信信号研究设计院集团有限公司 | Satellite time service-based time keeping method and system |
| CN112339792A (en) * | 2020-11-10 | 2021-02-09 | 北京天润海图科技有限公司 | Intelligent personal rapid transportation system based on communication control |
| CN113562023A (en) * | 2021-08-29 | 2021-10-29 | 陈建明 | Communication-based train operation control method with train positioning and integrity judgment |
Non-Patent Citations (4)
| Title |
|---|
| J. HAO ET AL.: ""High-Precision Performance of Tightly Coupled Positioning in Urban Environment"", 《2021 2ND INFORMATION COMMUNICATION TECHNOLOGIES CONFERENCE (ICTC)》 * |
| 吴茜等: "基于北斗授时技术的信号车载设备时钟同步方案探讨", 《铁道通信信号》 * |
| 肖利君: "长沙地铁全网统一时钟系统与高精度时间同步的研究与实践", 《通讯世界》 * |
| 赵晓峰: ""无线CBTC信号系统时间同步机制分析"", 《铁路通信信号工程技术（RSCE）》 * |
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Application publication date: 20220128 |