CN109367579A - Train communication system - Google Patents
Train communication system Download PDFInfo
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- CN109367579A CN109367579A CN201811165848.4A CN201811165848A CN109367579A CN 109367579 A CN109367579 A CN 109367579A CN 201811165848 A CN201811165848 A CN 201811165848A CN 109367579 A CN109367579 A CN 109367579A
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- distance measuring
- communication data
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- 238000004891 communication Methods 0.000 title claims abstract description 184
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000016776 visual perception Effects 0.000 description 2
- 241001269238 Data Species 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000002366 time-of-flight method Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L15/00—Indicators provided on the vehicle or train for signalling purposes
- B61L15/0072—On-board train data handling
-
- 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
- B61L27/40—Handling position reports or trackside vehicle data
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Train Traffic Observation, Control, And Security (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The present invention relates to train communication technical fields, in particular to a kind of train communication system.The train communication system includes multiple mobile units being set on each train and multiple ground node equipment along train rail setting.Multiple mobile units are for sending and receiving communication data.Multiple ground node equipment are used to receive the communication data that the mobile unit issues, and the communication data is transmitted to target mobile unit, with realize be provided with issue communication data mobile unit train and be provided with the target mobile unit train between communication.Train communication system provided in an embodiment of the present invention has higher communication reliability, can effectively guarantee the traffic safety of train.
Description
Technical field
The present invention relates to train communication technical fields, in particular to a kind of train communication system.
Background technique
In existing train communication system, the information exchange between train and train is (general by central station
All over being set to train website) realize, it is real-time that the train of operation can only obtain other trains by central station
Location information and running speed etc., to understand the driving states of other trains.Therefore, when data processing centre breaks down
When, it just cannot achieve information exchange between train and train, so that the traffic safety of train is seriously threatened.
Summary of the invention
In view of this, the purpose of the embodiment of the present invention is, a kind of train communication system is provided to solve the above problems.
Train communication system provided in an embodiment of the present invention includes multiple mobile units being set on each train and multiple
Along the ground node equipment of train rail setting；
Multiple mobile units are for sending and receiving communication data；
Multiple ground node equipment are used to receive the communication data that the mobile unit issues, and by the communication number
According to target mobile unit is transmitted to, to realize the train for the mobile unit for being provided with sending communication data and be provided with the target
Communication between the train of mobile unit.
Further, for each ground node equipment in multiple ground node equipment, which is set
It is ready for use on the communication number that the mobile unit or other ground node equipment of reception and its spacing within default communication distance are sent
According to, and the communication data is transmitted to and other mobile units or ground node of its spacing within default communication distance are set
It is standby.
Further, the mobile unit includes communication distance measuring device and on-vehicle host, the communication distance measuring device and institute
State on-vehicle host connection；
The communication distance measuring device be used for detect be arranged the mobile unit train and multiple ground node equipment it
Between range information, and be sent to the on-vehicle host；
The on-vehicle host obtains according to the range information and the mobile unit is arranged for receiving the range information
The location information of train, and return to the communication distance measuring device；
The communication distance measuring device is also used to receive the location information, generates the communication number for carrying the location information
According to, and issue.
Further, the mobile unit further includes vehicle speed detector device, and on the vehicle speed detector device and the train
The communication distance measuring device connection being arranged；
The vehicle speed detector device is used to detect the running speed for the train that the vehicle speed detector device is arranged, and is sent to institute
State communication distance measuring device；
The communication distance measuring device is also used to receive the running speed, generates the communication number for carrying the running speed
According to, and issue.
Further, the train communication system further includes multiple Train Management equipment being set on each train, described
Train Management equipment includes running crane control device, and the running crane control device being arranged on each train and the communication being arranged on the train
Range unit connection；
The communication distance measuring device is also used to receive the communication data of other communication distance measuring devices sending, and is transmitted to
The running crane control device；
The running crane control device adjusts according to the communication data and the driving is arranged for receiving the communication data
The driving states of the train of control device.
Further, the running crane control device includes control instruction generator and thermoacoustic prime engine device, the control instruction
With the thermoacoustic prime engine device and the communication distance measuring device that is arranged on the train of the running crane control device is arranged respectively in generator
Connection；
The control instruction generator generates thermoacoustic prime engine according to the communication data and refers to for receiving the communication data
It enables, and thermoacoustic prime engine instruction is sent to the thermoacoustic prime engine device；
The train that the thermoacoustic prime engine device is used to instruct adjustment that the running crane control device is arranged according to the thermoacoustic prime engine
Driving states.
Further, the Train Management equipment further includes display controller and display, the display controller difference
With the display and the communication distance measuring device that is arranged on the train of the Train Management equipment is set it connect；
The communication distance measuring device is also used to receive the communication data of other communication distance measuring devices sending, and is transmitted to described
Display controller；
The display controller is for parsing the communication data, to obtain the institute for including in the communication data
Location information is stated, and is sent to the display；
The display is used to receive the location information, and by the corresponding geographical coordinate of the location information in track essence
It is shown on close electronic map.
Further, the display also with the Train Management equipment is set train on the on-vehicle host that is arranged connect
It connects；
The on-vehicle host is also used to the location information of acquisition being sent to the display；
The display is also used to receive the location information, and by the corresponding geographical coordinate of the location information in track
It is shown on precise electronic map.
Further, the communication distance measuring device is super broad band radio communication device, and/or, the ground node equipment
For super broad band radio communication device.
Further, there are two mobile units for setting on each column train, wherein a mobile unit is set to train
Headstock, another described mobile unit are set to the train tailstock；
The mobile unit of train head is set to be used to lead to the ground node equipment being located in front of the train
Letter；
The mobile unit for being set to the train tailstock is used to lead to the ground node equipment for being located at the train rear
Letter.
Train communication system provided in an embodiment of the present invention include include multiple mobile units being set on each train and
Multiple ground node equipment along train rail setting.Multiple mobile units are for sending and receiving communication data.It is multiple
The ground node equipment is used to receive the communication data that the mobile unit issues, and the communication data is transmitted to target
Mobile unit, to realize the train for being provided with the mobile unit for issuing communication data and the column for being provided with the target mobile unit
Communication between vehicle.In this way, when certain that can be transmitted to communication data in multiple ground node equipment of target mobile unit
When a ground node equipment breaks down, which can also pass through other without failure ground node device forwards
Target mobile unit is given, therefore, train communication system provided in an embodiment of the present invention has higher communication reliability, Neng Gouyou
Effect ground guarantees the traffic safety of train.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described.It should be appreciated that the following drawings illustrates only certain embodiments of the present invention, therefore it is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 is a kind of structural schematic diagram of train communication system provided in an embodiment of the present invention.
Fig. 2 is a kind of application scenarios schematic diagram of train communication system provided in an embodiment of the present invention.
Fig. 3 is a kind of structural schematic diagram of mobile unit provided in an embodiment of the present invention.
Fig. 4 is the structural schematic diagram of Train Management equipment in a kind of train communication system provided in an embodiment of the present invention.
Icon: 10- train communication system；100- mobile unit；110- communication distance measuring device；120- on-vehicle host；130-
Vehicle speed detector device；200- ground node equipment；300- Train Management equipment；310- running crane control device；311- control instruction
Generator；312- thermoacoustic prime engine device；320- display controller；330- display.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description.Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually
The component for the embodiment of the present invention being described and illustrated herein in the accompanying drawings can be arranged and be designed with a variety of different configurations.Cause
This, is not intended to limit claimed invention to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
Range, but it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
Fig. 1 and Fig. 2 are please referred to, the embodiment of the invention provides a kind of train communication system 10, the train communication systems 10
Including multiple mobile units 100 being set on each train and multiple ground node equipment 200 along train rail setting.
Wherein, multiple mobile units 100 are for sending and receiving communication data.Multiple ground node equipment
200 communication datas issued for receiving the mobile unit 100, and the communication data is transmitted to target mobile unit
100, to realize the train for the mobile unit 100 for being provided with sending communication data and be provided with the target mobile unit 100
Communication between train.
For each ground node equipment 200 in multiple ground node equipment 200, the ground node equipment
200 for receiving and mobile unit 100 or other ground node equipment 200 transmission of its spacing within default communication distance
Communication data, and by the communication data be transmitted to and other mobile units 100 within default communication distance of its spacing or
Ground node equipment 200.Wherein, the default communication is determined away from the attribute by the ground node equipment 200, the present embodiment
In, the default communication is away from being specifically as follows 2km~4km.
Further, in this embodiment the mobile unit 100 being arranged on each train can be one, it is also possible to two,
Or it is more.When being provided with a mobile unit 100 on the mobile unit 100, which be can be set in column
Vehicle headstock also can be set in train tailstock portion.When setting is there are two mobile unit 100 on the mobile unit 100, one
The mobile unit 100 is set to train head, for being communicated with the ground node equipment 200 being located in front of the train,
Another described mobile unit 100 is set to the train tailstock, for be located at the train rear the ground node equipment 200
Communication, in this way, can avoid train, signal is interfered and influences transmission effect when serpentine tracks in crossing-river tunnel or traveling mountain
Rate.In addition, multiple ground node equipment 200 can be along train rail with the row of equidistant linear array in the present embodiment
Mode for cloth setting, for example, can be arranged with the arrangement mode of the equidistant linear array of 500m~800m.
By above-mentioned setting, in travelling process of train, when communication data can be transmitted to target mobile unit 100
When some ground node equipment 200 in multiple ground node equipment 200 breaks down, which can also pass through other
Without failure ground node equipment 200 is transmitted to target mobile unit 100, therefore, train provided in an embodiment of the present invention
Communication system 10 has higher communication reliability, can effectively guarantee the traffic safety of train.
Incorporated by reference to Fig. 3, optionally, in the present embodiment, the mobile unit 100 includes communication distance measuring device 110 and vehicle-mounted
Host 120, the communication distance measuring device 110 are connect with the on-vehicle host 120.The communication distance measuring device 110 is for detecting
The train and the distance between multiple ground node equipment 200 information of the mobile unit 100 are set, and are sent to the vehicle
Carry host 120.The position of multiple ground node equipment 200 is it is known that therefore, the on-vehicle host 120 is fallen described in reception
After range information, the location information that the train of the mobile unit 100 is set can be obtained according to the range information, and return
To the communication distance measuring device 110.The communication distance measuring device 110 is just generated and is carried after receiving the location information
The communication data of the location information, and issue.In the present embodiment, the communication distance measuring device 110 and/or ground node equipment
200 can be super broad band radio communication device, super broad band radio communication device be one kind can by two-way time-of-flight method into
The communication device of row ranging, and it is excellent to have that strong anti-interference performance, efficiency of transmission are high, very bandwidth is wide and transmission power is low etc.
Gesture.
In the present embodiment, the mobile unit 100 can also include vehicle speed detector device 130, and the Bus- Speed Monitoring fills
130 are set to connect with the communication distance measuring device 110 being arranged on the train.The vehicle speed detector device 130 is for detecting setting
The running speed of the train of the vehicle speed detector device 130, and it is sent to the communication distance measuring device 110.The communication distance measuring dress
It sets 110 and is also used to receive the running speed, generate the communication data for carrying the running speed, and issue.It therefore, can be with
Understand, in the present embodiment, the communication data that the mobile unit 100 issues includes the train that the mobile unit 100 is arranged
Location information and running speed.
Incorporated by reference to Fig. 4, in the present embodiment, the train communication system 10 further includes multiple trains being set on each train
Management equipment 300, the Train Management equipment 300 include running crane control device 310, and the thermoacoustic prime engine dress being arranged on each train
310 are set to connect with the communication distance measuring device 110 being arranged on the train.It is logical that the communication distance measuring device 110 is also used to receive other
Believe the communication data that range unit 110 issues, and is transmitted to the running crane control device 310.The running crane control device
310 for receiving the communication data, and the row that the train of the running crane control device 310 is arranged is adjusted according to the communication data
Car state.
Wherein, the running crane control device 310 may include control instruction generator 311 and thermoacoustic prime engine device 312, described
Control instruction generator 311 with the thermoacoustic prime engine device 312 and is arranged on the train of the running crane control device 310 and is arranged respectively
The communication distance measuring device 110 connects.The control instruction generator 311 is for receiving the communication data, according to described logical
Letter data generates thermoacoustic prime engine instruction, and thermoacoustic prime engine instruction is sent to the thermoacoustic prime engine device 312.The driving control
The driving states for the train that device 312 processed is used to instruct adjustment that the running crane control device 310 is arranged according to the thermoacoustic prime engine.
In order to enable train driver can visual perception close on the position of train, in the present embodiment, the Train Management
Equipment 300 can also include display controller 320 and display 330, the display controller 320 respectively with the display
It 330 and the communication distance measuring device 110 that is arranged on the train of the Train Management equipment 300 is set connects.The communication distance measuring device
110 are also used to receive the communication data of other communication distance measuring devices 110 sending, and are transmitted to the display controller 320.It is described
Display controller 320 is for parsing the communication data, to obtain the position for including in communication data letter
Breath, and it is sent to the display 330.The display 330 is for receiving the location information, and by the location information pair
The geographical coordinate answered is shown on track precise electronic map.
Equally, in order to enable train driver is capable of the position of the driven train of visual perception itself, in the present embodiment, institute
Display 330 is stated also to connect with the on-vehicle host 120 being arranged on the train that the Train Management equipment 300 is arranged.The vehicle
Host 120 is carried to be also used to for the location information of acquisition to be sent to the display 330.The display 330 is also used to receive institute
Location information is stated, and the corresponding geographical coordinate of the location information is shown on track precise electronic map.
For the application scenarios shown in Fig. 2, communication that train 1 can include by being set to the mobile unit 100 of headstock
The range information of range unit 110 detection and multiple ground node equipment 200, and it is sent to the vehicle that the mobile unit 100 includes
Host 120 is carried, which obtains the location information of train 1 according to the range information, and returns to the communication and survey
Away from device 110, so that the communication distance measuring device 110 generates the communication data for carrying the location information of train 1, meanwhile, train 1
The vehicle speed detector device 130 that can also include by being set to the mobile unit 100 of headstock detects the running speed of train 1, and
It is sent to the communication distance measuring device 110, so that the communication distance measuring device 110 generates the logical of the running speed for carrying train 1
Letter data.Hereafter, the communication distance measuring device 110 is by the communication data by setting on the train rail between train 1 and train 2
The multiple ground node equipment 200 set are sent to the communication distance measuring device in the mobile unit 100 of 2 tailstock of train setting included
110, then, which is sent to the communication data on the finger that 2 thermoacoustic prime engine device of train, 312 device includes
Generator is enabled, then, described instruction generator generates thermoacoustic prime engine according to the communication data and instructs, and by the thermoacoustic prime engine
Instruction is sent to the thermoacoustic prime engine device 312 that 2 thermoacoustic prime engine device of train, 312 device includes, so that the thermoacoustic prime engine device 312 is according to institute
The driving states for stating thermoacoustic prime engine instruction adjustment train 2, are closer to avoid train 2 with train 1, and train 1 is driven a vehicle speed
It collides with train 1 when spending very fast and influences traffic safety.Further, it is to be appreciated that train 1 can also be by being set to
The mobile unit 100 of the tailstock is communicated with above-mentioned identical communication mode with the realization of mobile unit 100 that 3 headstock of train is arranged, with
Train 3 is avoided to collide with train 2.
In conclusion train communication system 10 provided in an embodiment of the present invention includes including multiple be set on each train
Mobile unit 100 and multiple ground node equipment 200 along train rail setting.Multiple mobile units 100 are for issuing
With reception communication data.Multiple ground node equipment 200 are used to receive the communication data that the mobile unit 100 issues,
And the communication data is transmitted to target mobile unit 100, the mobile unit 100 for issuing communication data is provided with to realize
Communication between train and the train for being provided with the target mobile unit 100.In this way, when that communication data can be transmitted to mesh
When marking some ground node equipment 200 failure in multiple ground node equipment 200 of mobile unit 100, the communication number
According to target mobile unit 100 can also be transmitted to by other without failure ground node equipment 200, therefore, the present invention
The train communication system 10 that embodiment provides has higher communication reliability, can effectively guarantee the traffic safety of train.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " setting " " connects
Connect " it shall be understood in a broad sense, for example, it may be being fixedly connected, it may be a detachable connection, or cooperate.It can be machinery
Connection, is also possible to be electrically connected.It can be directly connected, two elements can also be can be indirectly connected through an intermediary
Internal connection.For the ordinary skill in the art, it can understand above-mentioned term in the present invention with concrete condition
Concrete meaning.
In the description of the present invention, it is also necessary to explanation, the orientation or positional relationships of the instructions such as term " on " be based on
Orientation or positional relationship shown in the drawings or the invention product using when the orientation or positional relationship usually put, be only
For the convenience of describing the present invention and simplifying the description, rather than the device or element of indication or suggestion meaning must have specific side
Position is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of train communication system, which is characterized in that including multiple mobile units being set on each train and multiple edge column
The ground node equipment of track road setting；
Multiple mobile units are for sending and receiving communication data；
Multiple ground node equipment are used to receive the communication data that the mobile unit issues, and the communication data is turned
Target mobile unit is issued, is provided with the train of the mobile unit for issuing communication data and to be provided with the target vehicle-mounted to realize
Communication between the train of equipment.
2. train communication system according to claim 1, which is characterized in that in multiple ground node equipment
Each ground node equipment, which is used to receive and its spacing is presetting the mobile unit within communication distance
Or the communication data that other ground node equipment are sent, and the communication data is transmitted to and its spacing is in default communication distance
Within other mobile units or ground node equipment.
3. train communication system according to claim 1, which is characterized in that the mobile unit includes communication distance measuring device
And on-vehicle host, the communication distance measuring device are connect with the on-vehicle host；
The communication distance measuring device, which is used to detect, to be arranged between the train and multiple ground node equipment of the mobile unit
Range information, and it is sent to the on-vehicle host；
The on-vehicle host obtains the train that the mobile unit is arranged according to the range information for receiving the range information
Location information, and return to the communication distance measuring device；
The communication distance measuring device is also used to receive the location information, generates the communication data for carrying the location information,
And it issues.
4. train communication system according to claim 3, which is characterized in that the mobile unit further includes Bus- Speed Monitoring dress
It sets, and the communication distance measuring device being arranged on the vehicle speed detector device and the train is connect；
The vehicle speed detector device is used to detect the running speed for the train that the vehicle speed detector device is arranged, and is sent to described logical
Believe range unit；
The communication distance measuring device is also used to receive the running speed, generates the communication data for carrying the running speed,
And it issues.
5. train communication system according to claim 3 or 4, which is characterized in that the train communication system further includes more
A Train Management equipment being set on each train, the Train Management equipment include running crane control device, and set on each train
The running crane control device set and the communication distance measuring device being arranged on the train are connect；
The communication distance measuring device is also used to receive the communication data of other communication distance measuring devices sending, and is transmitted to described
Running crane control device；
The running crane control device adjusts according to the communication data and the thermoacoustic prime engine is arranged for receiving the communication data
The driving states of the train of device.
6. train communication system according to claim 5, which is characterized in that the running crane control device includes control instruction
Generator and thermoacoustic prime engine device, the control instruction generator respectively with the thermoacoustic prime engine device and be arranged the running crane control device
Train on be arranged the communication distance measuring device connection；
The control instruction generator generates thermoacoustic prime engine instruction for receiving the communication data, according to the communication data,
And thermoacoustic prime engine instruction is sent to the thermoacoustic prime engine device；
The driving for the train that the thermoacoustic prime engine device is used to instruct adjustment that the running crane control device is arranged according to the thermoacoustic prime engine
State.
7. train communication system according to claim 5, which is characterized in that the Train Management equipment further includes display control
Device and display processed, the display controller with the display and are arranged on the train of the Train Management equipment and are arranged respectively
The connection of communication distance measuring device；
The communication distance measuring device is also used to receive the communication data of other communication distance measuring devices sending, and is transmitted to the display
Controller；
The display controller is for parsing the communication data, to obtain the institute's rheme for including in the communication data
Confidence breath, and it is sent to the display；
The display is used to receive the location information, and by the corresponding geographical coordinate of the location information in the accurate electricity of track
It is shown on sub- map.
8. train communication system according to claim 7, which is characterized in that the display also be arranged the Train Management
The on-vehicle host connection being arranged on the train of equipment；
The on-vehicle host is also used to the location information of acquisition being sent to the display；
The display is also used to receive the location information, and by the corresponding geographical coordinate of the location information in track precision
It is shown on electronic map.
9. train communication system according to claim 3, which is characterized in that the communication distance measuring device is super wideband wireless
Communication device, and/or, the ground node equipment is super broad band radio communication device.
10. train communication system according to claim 1, which is characterized in that setting is set there are two vehicle-mounted on each column train
It is standby, wherein a mobile unit is set to train head, another described mobile unit is set to the train tailstock；
The mobile unit for being set to train head is used to communicate with the ground node equipment being located in front of the train；
The mobile unit for being set to the train tailstock is used to communicate with the ground node equipment for being located at the train rear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811165848.4A CN109367579B (en) | 2018-09-30 | 2018-09-30 | Train communication system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811165848.4A CN109367579B (en) | 2018-09-30 | 2018-09-30 | Train communication system |
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| CN112351491A (en) * | 2020-10-27 | 2021-02-09 | 林平 | Unpowered movable carrier positioning method, system, device and medium |
| CN114537476A (en) * | 2020-11-26 | 2022-05-27 | 比亚迪股份有限公司 | Train anti-collision processing method, device and system |
| CN115298078A (en) * | 2019-09-09 | 2022-11-04 | 派珀网络公司 | Enhanced traffic positioning system and method |
| CN115298077A (en) * | 2019-08-29 | 2022-11-04 | 派珀网络公司 | Enhanced traffic positioning system and method |
| CN115339486A (en) * | 2022-08-18 | 2022-11-15 | 青岛海信微联信号有限公司 | Method, device and system for determining train envelope |
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