CN108609036A - Train positions and speed-measuring method - Google Patents
Train positions and speed-measuring method Download PDFInfo
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- CN108609036A CN108609036A CN201810430530.8A CN201810430530A CN108609036A CN 108609036 A CN108609036 A CN 108609036A CN 201810430530 A CN201810430530 A CN 201810430530A CN 108609036 A CN108609036 A CN 108609036A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L25/00—Recording or indicating positions or identities of vehicles or vehicle trains or setting of track apparatus
- B61L25/02—Indicating or recording positions or identities of vehicles or vehicle trains
- B61L25/021—Measuring and recording of train speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L25/00—Recording or indicating positions or identities of vehicles or vehicle trains or setting of track apparatus
- B61L25/02—Indicating or recording positions or identities of vehicles or vehicle trains
- B61L25/025—Absolute localisation, e.g. providing geodetic coordinates
-
- 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
Abstract
The present embodiments relate to a kind of positioning of train and speed-measuring methods, and vehicle-mounted control center controls vehicle-mounted optical network communication node and sends out the first radio spread spectrum communication signal, including the spreading code of vehicle-mounted optical network communication node；The first ground network node in first ground network group of nodes is authenticated train information according to the first spreading code and the first radio spread spectrum communication signal listened to；When certification by when, the first ground network node send the second radio spread spectrum communication signal；Second radio spread spectrum communication signal includes the authentication information and area code of the first ground network node；Vehicle-mounted optical network communication node receives the second wireless communication signals that the first ground network node is sent, and is transmitted to vehicle-mounted control center；Vehicle-mounted control center carries out dissection process to the authentication information of the second wireless communication signals of one or more vehicle-mounted optical network communication node-node transmissions and area code in certain time, obtains the real-time position information and/or driving speed information of train.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of positioning of train and speed-measuring methods.
Background technology
As train running speed improves, the entangled prestige of people, pilot steering train is leaned on to cannot be guaranteed traffic safety completely.Railway is special
It is directly transport production service to be with communication, and railway is effectively connected into an entirety by it, is ensureing that railway operation is unimpeded
With safe and punctual aspect play the role of it is most important all.
The rail track point more than long lines in China, geographical environment change greatly, road condition change is more, weather conditions change greatly so that
Realize that the wireless communication of railway special communication becomes increasingly difficult, it is difficult to build up an effective reliable wireless signal system.Especially
It is the continuous promotion with railway transportation train speed, existing Railroad Communication System, in particular for the communication system of high ferro
System, is all difficult to reach demand in validity, reliability and safety.
Existing high ferro wireless communication system is under high-speed mobile condition, radio spread spectrum communication especially wireless broadband communication
Multipath fading drastically amplified, direct communication path is destroyed due to high-speed mobile instead many can not be predicted
Communication path, these phenomenons are to directly result in the main reason for multipath fading significantly increases under high-speed mobile.This phenomenon exists
It is especially prominent under high-power remote radio spread spectrum communication mode.
In order to achieve the purpose that radio spread spectrum communication especially wireless broadband communication under high-speed condition, along high ferro circuit long distance
It is common practice from building base station and increasing communication and power, and this way exactly reduces the reliable of radio spread spectrum communication
Property.Such as rain, snow, mist harsh weather phenomenon can not only reduce wirelessly due to climate change for remote-wireless spread spectrum communication
The quality of spread spectrum communication, or even communication can be therefore interrupted, therefore such radio spread spectrum communication will lose high ferro informationization and intelligence
The status of the important support means of energyization, can directly result in high ferro informationization and intelligentized failure, needless to say to train
Positioning in real time and monitoring.
In addition, interference can bring the application of rail traffic serious problem.Interference can influence wireless frequency expansion positioning result,
Due to there is other wireless communications to exist side by side in rail traffic, such as artificial RF choke or other users are near rail traffic
The unwarranted access point of installation is ultimately caused and is had between practical rail and the positioning of calculated wireless frequency expansion very greatly partially
Difference, or even communication disruption or serious error are caused, influence railway security.
Invention content
The purpose of the present invention is in view of the drawbacks of the prior art, providing a kind of positioning of train and speed-measuring method, has and distinguish
The authentication function of user can accurately confirm the information of train, and can be intelligentized according to train traveling situation, intelligentized to open
Open and close ground along rail communication node, prevent any invalid information from invading；It is compatible with existing train communication system, it can be mutual
For backup, increase reliability；It can reliably work, position under what geographical conditions, road conditions condition and weather conditions in office
While test the speed to train, and can be according to needing to configure communication node, to meet wanting for different positioning accuracy
It asks, realizes that high-precision train is positioned and tested the speed in real time.
In view of this, an embodiment of the present invention provides a kind of positioning of train and speed-measuring methods, including：
Vehicle-mounted control center sends first control signal so that the vehicle-mounted optical network communication node sends out the first wireless expansion
Frequency signal of communication；The first radio spread spectrum communication signal includes the spreading code of the vehicle-mounted optical network communication node；The expansion
Frequency code carries the authentication information of the vehicle-mounted optical network communication node；
The first ground network node in the first ground network group of nodes is issued according to railway operation control centre
The first spreading code and the first radio spread spectrum communication signal for listening to, train information is authenticated；First ground
Torus network group of nodes includes at least one ground network node group, and each ground network node group includes at least one terrestrial network
Network node；
When certification by when, the first ground network node sends the second radio spread spectrum communication signal；Second nothing
Line spread spectrum communications signals include the authentication information and area code of the first ground network node；The area code is marking
Know the location information of the ground network node；
The vehicle-mounted optical network communication node receives second wireless communication that the first ground network node is sent
Signal, and it is transmitted to the vehicle-mounted control center；
The vehicle-mounted control center to one or more vehicle-mounted optical network communication node-node transmission in certain time described the
The authentication information and area code of two wireless communication signals carry out dissection process, obtain the train real-time position information and/
Or driving speed information.
Preferably, the vehicle-mounted control center is according to one or more vehicle-mounted optical network communication node-node transmissions in certain time
Dissection process is carried out to the authentication information and area code of second wireless communication signals, obtain the real-time position of the train
Confidence ceases and/or driving speed information specifically includes：
Authentication information and region of the vehicle-mounted control center according to second wireless communication signals being currently received
Code determines the current orbit information and location information of the ground network node；
The vehicle-mounted control center is according to described in the current orbit information of the ground network node and location information determination
The real-time position information of train；And/or
Second wireless communication signals that the vehicle-mounted control center is arrived according to the first reception before current
Authentication information and area code determine the ground network node first moment orbit information and location information；And root
Orbit information and location information, current orbit information and location information and the first moment according to first moment with work as
The driving speed information of the train is calculated in time difference between the preceding moment.
Preferably, the method further includes：
When certification by when, the first ground network node is by the first radio spread spectrum communication signal, described first
The authentication information and area code of ground network node pass through the ground passive optical network and the railway special communication network
It is sent to the railway operation control centre；
Certification of the railway operation control centre to the first radio spread spectrum communication signal, the ground network node
Information and area code carry out dissection process, obtain the real-time position information and/or driving speed information of the train.
It is further preferred that the railway operation control centre is to the first radio spread spectrum communication signal, the ground
The authentication information and area code of network node carry out dissection process, obtain the real-time position information and/or traveling of the train
Velocity information specifically includes：
The railway operation control centre is according to described in the first radio spread spectrum communication signal determination being currently received
The information of train, and the current orbit information and position of the ground network node is determined according to the authentication information and area code
Confidence ceases；
The railway operation control centre is according to described in the determination of the orbit information and location information of the ground network node
The real-time position information of train；And/or
Information that the railway operation control centre obtains the train it is corresponding it is current before the first reception arrive
The ground network node orbit information and location information；And believed according to the orbit information at first moment and position
Breath, current orbit information and the time difference between location information and the first moment and current time, the row are calculated
The driving speed information of vehicle.
Preferably, the method further includes：
The railway operation control centre is recognized according to the first radio spread spectrum communication signal, the ground network node
It demonstrate,proves information and area code generates the second activation instruction, and by under the railway special communication network and ground passive optical network
It is sent to the second ground network node being disposed adjacent with the first ground network group of nodes along the travel direction of the train
Group so that the second ground network group of nodes is converted to listening state by closed state；The second ground network section
Point group includes at least one ground network node group.
Preferably, the vehicle-mounted control center sends first control signal so that the vehicle-mounted optical network communication node hair
Go out the first radio spread spectrum communication signal to specifically include：
The vehicle-mounted control center sends first control signal so that except being set to a last vehicle-mounted optical network communication
The first wireless communication signals that other vehicle-mounted optical network communication nodes outside node are sent out include spreading code and train operation state
Information；And
The vehicle-mounted control center sends first control signal so that described to be set to a last vehicle-mounted optical-fiber network logical
The first wireless communication signals that letter node is sent out include spreading code and command information；Described instruction information is to close terrestrial network
The command information of network node.
It is further preferred that the method further includes：
The ground network node in listening state listen to that the vehicle-mounted optical network communication node sends out to
When closing the command information of ground network node, by the terrestrial network where the ground network node or the ground network node
Whole ground network nodes in network node group are converted to close off state by listening state.
Preferably, multiple vehicle-mounted optical network communication node spaced sets, multiple described ground network node groups etc.
Spacing is arranged, the spacing l between the two neighboring vehicle-mounted optical network communication node and two neighboring ground network node group it
Between spacing L meet l=L × (1-1/n)；Wherein n is the quantity of the vehicle-mounted optical network communication node.
Preferably, the first radio spread spectrum communication signal further includes plain code, carry train operation state information and/or
Command information；The second radio spread spectrum communication signal further includes plain code, carries command information.
Preferably, the method further includes：
The ground network section that the ground network node group of positioning accuracy parameter setting one according to the train includes
The quantity of point；
Wherein, multiple ground network node spaced sets in the ground network node group；The ground network section
Point is set in turn in along the direction of train rail between two rails of the train rail；Or
Determine that the spread spectrum that a vehicle-mounted optical network communication node includes is logical according to the positioning accuracy parameter of the train
Believe the quantity of transceiver；
Wherein, multiple spread spectrum communication transceiver spaced sets that a vehicle-mounted optical network communication node includes.
Train positioning provided in an embodiment of the present invention and speed-measuring method provide a kind of car-ground radio spread spectrum based on along rail
Communication pattern can carry out user and authorize, the accurate information for confirming train, and can be intelligentized according to train traveling situation, intelligence
The opening and closing ground of energyization along rail communication node, prevent any invalid information from invading, it is simultaneous with existing train communication system
Hold, can backup each other, increases reliability.It being capable of reliably work under what geographical conditions, road conditions condition and weather conditions in office
Make, tests the speed to train while positioning, and can be according to needing to configure communication node, to meet different positioning
The requirement of precision realizes that high-precision train is positioned and tested the speed in real time.
Description of the drawings
The structural schematic diagram of Fig. 1 for vehicle provided in an embodiment of the present invention auxiliary communication systems；
The structural schematic diagram of Fig. 2 for cursor type mobile network vehicle provided in an embodiment of the present invention auxiliary communication systems；
The communication process schematic diagram of Fig. 3 for vehicle provided in an embodiment of the present invention auxiliary communication systems；
Fig. 4 is a kind of train position provided in an embodiment of the present invention and the method flow diagram that tests the speed；
Fig. 5 is another train position provided in an embodiment of the present invention and the method flow diagram to test the speed.
Specific implementation mode
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Train provided in an embodiment of the present invention positioning and speed-measuring method are based on vehicle as shown in Figure 1 subsidiary communications systems
It unites to realize.
For convenience of understanding, to vehicle auxiliary communication system is introduced first.
As shown in Figure 1, vehicle auxiliary communication system include onboard wireless spread spectrum communication system 1 and terrestrial wireless spread spectrum communication
System 2；
Onboard wireless spread spectrum communication system 1 includes：Vehicle-mounted control center 11, vehicle-mounted passive optical-fiber network 12 and multiple vehicle-mounted light
Network communication node 13；Vehicle-mounted passive optical-fiber network 12 includes optical line terminal (optical line terminal, OLT) and more
A optical network unit (Optical Network Unit, ONU)；Each vehicle-mounted optical network communication node 13 is connect by an ONU
Enter vehicle-mounted passive optical-fiber network 12, and vehicle-mounted control center 11 is accessed by OLT；Each vehicle-mounted optical network communication node 13 has one
A authentication information；Vehicle-mounted optical network communication node 13 is set in turn in the bottom of train, vehicle-mounted light net according to This train is bound for XXX
The radiation direction for the first radio spread spectrum communication signal that network communication node 13 emits is downward vertically in This train is bound for XXX；
Terrestrial wireless spread spectrum communication system 2 includes：Railway operation control centre 21, railway special communication network 22, ground
Passive optical network 23 and multiple ground network node groups 24；Ground passive optical network 23 includes optical line terminal OLT and multiple light
Network element ONU；Each ground network node group 24 includes at least one ground network node；Each ground network node passes through
One ONU accesses ground passive optical network 23, accesses railway special communication network 22 by OLT, and pass through railway special communication
Network 22 accesses railway operation control centre 21；Each ground network node has there are one authentication information and an area code,
Wherein authentication information may include the internet protocol address of ground network node, and area code is for indicating the ground network
The location information of node.
In this example, ground network node specifically uses direct sequence spectrum spread communication transceiver；Vehicle-mounted optical network communication node 13
Specifically use spread spectrum communication transceiver.
We are by multiple vehicle-mounted 13 spaced sets of optical network communication node, after being preferably set to every section compartment
Position；Multiple ground network node groups 24 are also along rail spaced set between two rails of train rail, preferably
The centre for being set to two rails.In order to enable train along rail when driving, maximum times with ground network node carry out
Communication interaction, spacing l and two neighboring ground network node group 24 between two neighboring vehicle-mounted optical network communication node 13 it
Between spacing L meet l=L × (1-1/n)；Wherein n is vehicle-mounted optical network communication node and ground in the distance that train moves L
The alignment number of network node group, i.e. n+1 are the quantity of vehicle-mounted optical network communication node.In this way train along rail when driving, just
The vernier using L/n as step pitch is obtained, train often moves the distance of L, and the n on train vehicle-mounted optical network communication nodes 13 can divide
It is not communicated with n ground network node group 24 on ground, it is assumed that only include 1 ground in each ground network node group 24
Torus network node, i.e., cursor type mobile network's vehicle as shown in Figure 2 auxiliary communication system structural representation, which part portion exists
It omits and is not drawn into figure.Vehicle-mounted optical network communication node 13_1 ON TRAINS is aligned with ground network node N+1 to be communicated
When, [(n-1) × L]/n, vehicle-mounted optical network communication are differed between vehicle-mounted optical network communication node 13_2 and ground network node N+1
The vehicle-mounted optical network communication node 13_n of [(n-2) × L]/n ... and ground are differed between node 13_3 and ground network node N+2
L/n is differed between network node N+ (n-1), between vehicle-mounted optical network communication node 13_ (n+1) and ground network node N+n again
Secondary coincidence.I.e. with n vehicle-mounted optical network communication nodes 13 for one group, in the distance that train moves L, n on train are vehicle-mounted
Optical network communication node 13 is once communicated with n ground network node group 24 on ground respectively, is amounted to and is moved L in train
Distance in complete n times communication.The multiple short message communication pattern of multiple spot is achieved, reliability is high.
Hereby it is achieved that train positioning accuracy can reach L/n.
If the positioning accuracy to train there are requirements at the higher level, each ground can be determined according to the positioning accuracy request of train
The quantity for the ground network node that network node group includes.I.e. by the way that multiple terrestrial networks are arranged in a ground network node group
Network node, to increase the alignment number of vehicle-mounted optical network communication node and ground network node, to which increase train at double is fixed
Position precision.Such as in each ground network node group, to first ground network section by first ground network node
The position of L/n, sets m ground network node, then train positioning accuracy can reach L/ altogether with the step pitch of L/ (m × n) after point
(m×n)；M and n is positive integer.
Alternatively, the spread spectrum that each vehicle-mounted optical network communication node includes can also be determined according to the positioning accuracy request of train
The quantity of communication transceiver.That is multiple spread spectrum communication transceivers are set in a vehicle-mounted optical network communication node, to increase and ground
The alignment number of torus network node, to increase train positioning accuracy at double.Such as in each vehicle-mounted optical network communication node
In, to the position of L/n after first spread spectrum communication transceiver by first spread spectrum communication transceiver, with the step of L/ (m × n)
M away from total setting spread spectrum communication transceiver, then train positioning accuracy can reach L/ (m × n)；M and n is positive integer.
In vehicle auxiliary communication system work when, vehicle-mounted control center 11 can be it is synchronous with the power plant of train,
When the power plant of train starts, vehicle-mounted control center 11 is just by vehicle-mounted passive optical-fiber network 12 to vehicle-mounted optical network communication section
Point 13 sends first control signal, emits the first radio spread spectrum communication signal to each vehicle-mounted optical network communication node 13.
It may include the spreading code of vehicle-mounted optical network communication node 13 in the first radio spread spectrum communication signal, be to set in advance
It sets；The authentication information and train operation state information that vehicle-mounted optical network communication node 13 is carried in spreading code, to
Ground network node is authenticated the information of train, and the interaction of train operation state information is completed after certification.
The first ground network group of nodes on This train is bound for XXX receives railway operation control centre 21 and passes through railway
The first activation instruction that dedicated communications network 22 and ground passive optical network 23 issue, the first ground network group of nodes is by closing
State is converted to listening state, and sending out radio spread spectrum communication signal to the vehicle-mounted optical network communication node 13 of train monitors；
Wherein, activation instruction includes communicating frequency point, the spreading code of vehicle-mounted optical network communication node 13 and train operation instruction；Communicate frequency point
It is the frequency point communicated for the vehicle-mounted optical network communication node 13 with train, makes an appointment and configure, so that vehicle-mounted
Optical network communication node 13 can be communicated with ground network node.By the spreading code for sending vehicle-mounted optical-fiber network so that energy
Enough radio spread spectrum communication signals sent out to vehicle-mounted optical network communication node 13 are verified, that is, verify whether train information is this
The train that time should pass through on that track.It, can be in vehicle-mounted optical network communication node 13 by sending train operation instruction
When being interacted with ground network node operating instruction is transmitted to train.
One ground network group of nodes includes at least one ground network node group 24, and each ground network node group
24 include at least one ground network node.
Under original state before train departure, the control of railway operation control centre 21 is opened in front of platform and platform along row
The first ground network group of nodes in vehicle travel direction.During train operation, railway operation control centre 21 can
According to current train operating condition, activation instruction is issued to the ground network node on each railroad track.Activation can every time
Can also be every time one or more ground network node groups 24 of unlatching simultaneously, i.e., to be single ground network node
Torus network group determines with specific reference to the configuration parameter of railway operation control centre 21.The activation of ground network group of nodes,
The monitoring that the first radio spread spectrum communication signal is sent out with the vehicle-mounted optical network communication node to train be it is relevant, in other words,
Which upper ground network group of nodes is activated time in which along track, is relevant with the running position of train.
The ground network group of nodes for receiving the first activation instruction is converted to listening state by closed state, to train
Vehicle-mounted optical network communication node sends out radio spread spectrum communication signal and is monitored.
Spreading code in the radio spread spectrum communication signal that vehicle-mounted optical network communication node is sent out, is set as different trains
Difference, the vehicle-mounted optical network communication nodes of difference on same train, the setting of spreading code can also be different.Independence may be used
Content of the IP address as spreading code, to verify the vehicle-mounted optical network communication node on train and train.
The first ground network node in first ground network group of nodes listens to the first radio spread spectrum communication signal, just
Train information certification can be carried out according to spreading code therein.According to the principle of spread spectrum communication, we when carrying out spread spectrum communication,
Despreading when spread spectrum and receiving end when transmitting end sends information receive information will use spreading code.Vehicle-mounted light net in this example
Network communication node 13 and ground network node transmitting end and receiving end each other.When being verified to train information, the first ground
For the first ground network node in network node group as receiving end, vehicle-mounted optical network communication node is transmitting end.These are pseudo-
Random sequence spreading code must be the periodic sequence that sending and receiving both sides know, otherwise receiving end can not independently generate the sequence
Being de-spread also can not just obtain information.Because this periodic binary sequence includes random character, its life is not known
Listener at method is None- identified.If we assign train and ground communication machine (i.e. vehicle-mounted optical network communication node
With ground network node) with identical pseudo-order code (spreading code) to prevent listener from finding out the content of communication, while with this
Spreading code distinguishes this train and other trains, when train is communicated with ground communication machine, vehicle-mounted optical network communication node with
The moment that ground network node capture spreading code is completes to communication counterpart (ground based spread spectrum communication transceiver or train)
Authentication, this process can be completed when the hardware of transceiver only being needed to connect physical layer in communication process, and the time takes
The ability of spreading code is certainly captured in the length of spread-spectrum code chip and hardware.
If the requirement for being 1 meter according to positioning accuracy, with needing the vehicle of present invention measurement of the assisted communication method to position
1/4 meter of resolution ratio can be reached.It is calculated when if being 360KM/ with the speed that high ferro is run, crosses the time of a quarter rice
Only 2.5 milliseconds, that is to say, that wireless telecom equipment must satisfy completes the primary communication for determining position within 2.5 milliseconds
Process could carry out high ferro train positioning that precision is 1 meter.
And the vehicle ground auxiliary communication system of the present invention, using spread spectrum communication, with (telecommunications cdma mobile communication under IS95 standards
System) practical application occasion, in 64 bit length of spread code length, the digital speech rate of normal communication is 9K or 13K, also
It is that the time of stabilization one spreading code of capture at least can reach 1/9000th seconds or 1/13000th seconds, that is, 0.11 milli
Second or 0.077 millisecond.This speed can reliably work for the high ferro speed of service.
Because even in high ferro with prestissimo when driving, the passing time of short message is also no longer than authenticated time, institute
Last several bit digitals of spreading code (PN codes) to be write with plain code.
First radio spread spectrum communication signal can be arranged on demand, and if code length is 64, coding structure is that 60 spreading codes add 4
Position plain code；Or first radio spread spectrum communication signal be set as 128, coding structure is that 120 spreading codes add 8 plain codes, or
64 spreading codes add 64 plain codes, to ensure the needs of information content.
The structure of following spreading code preferably may be used：
+ 4 (plain code)=64 60 (PN)
Or
+ 8 (plain code)=128 120 (PN)
To which we can obtain the instruction system of 4 16 kinds of states or 8 256 kinds of states, for describing the fortune of train
Row state or instruction.
The present invention vehicle auxiliary communication system by physical layer realize user authentication, to realize high speed under safety
Communication.
After having authenticated train information, the first ground network node is by the first radio spread spectrum communication signal, ground network
The authentication information and area code of node group 24 are sent to iron by ground passive optical network 23 and railway special communication network 22
Road runs control centre 21.Only minimum delay can be realized using ground passive optical network 23 and railway special communication network 22
Signal transmission.Railway operation control centre 21 can get train information, and energy according to the first radio spread spectrum communication signal
Train status information is got, can determine that the train is current according to the authentication information of ground network node group 24 and area code
Track, location information.
Later, railway operation control centre 21 is according to the current rail of identified train information, train status information, train
Road and location information generation refer to the activation of second group of ground network group of nodes in front of first group of ground network group of nodes
It enables, likewise, second group of ground network group of nodes also includes at least one ground network node group 24.It should be noted that
Preferably include the scheme of the ground network node group 24 of identical quantity using each ground network group of nodes in the present invention.
In the present system, different information is carried to the vehicle-mounted optical network communication node mounted on different location, using setting
The vehicle-mounted optical network communication node of last one is placed in close the ground network node of train process.
That is, vehicle-mounted control center 11, which by transmission first control signal, can to remove, is set to last one
The first wireless communication signals that other vehicle-mounted optical network communication nodes outside a vehicle-mounted optical network communication node are sent out include spread spectrum
Code and train operation state information；And to be set to the vehicle-mounted optical network communication node of last one is sent out first wirelessly
Signal of communication includes spreading code and to close the command information of ground network node.
When the ground network node in listening state listen to that vehicle-mounted optical network communication node sends out closing
The command information for closing ground network node, will be in the ground network node group 24 where ground network node or ground network node
Whole ground network nodes state is converted to close off by listening state.
In the process of running, always by vehicle auxiliary communication system opens the ground network section in train traveling front to train
Point, the ground network node for closing train process therefore, can be according to the prison of ground network node on This train is bound for XXX
It is different regions to listen state demarcation.It is specific as shown in Figure 2.
In the section of ground network node N to N+1, active region is constituted；In the section of N+1 to N+n, the comunication area is constituted
Domain, in N, the direction of the direction of N-1 ... and N+n, N+n+1 ... constitute quiet zone.
The vehicle ground auxiliary communication system of the present invention, during train operation, by communication process be confined to train body it
Under, and vehicle, to preceding unlatching, vehicle, which is crossed, closes, and thereby ensures that the safety of entire communication system.
In the present embodiment, by the way of spread spectrum communication into driving ground subsidiary communications its purpose be also be it is anti-interference,
The safety of enhancing system.Anti-interference is one of spread spectrum communication key property, for example signal spread-spectrum width is 100 times, and narrowband is dry
It disturbs and does not work substantially, and 100 times of the strength reduction of broadband interference, former interference strength is such as kept, then needs to increase 100 times
General power, this is substantially to be difficult to realize.It can just be obtained because signal reception needs spread spectrum coding to carry out coherently despreading processing, institute
Even if to be interfered with same type signal, in the case where not knowing the spreading code of signal, due between different spread spectrum codings
Different correlations, interference do not work yet.
The good concealment by the way of spread spectrum communication, because signal is extended over a wide frequency band, on unit bandwidth
Power very little, i.e. power spectrum density are very low, and signal is submerged among white noise, others is difficult to find the presence of signal, adds
Do not know spread spectrum coding, it is difficult to pick up useful signal, and extremely low power spectral density, also seldom other telecommunication equipments are constituted
Interference.
By the way of spread spectrum communication can anti-multipath jamming, anti-multipath jamming is always insoluble in wireless communication
Problem can be extracted from multipath signal with the relevant technologies in receiving terminal and be isolated using the correlation properties between spread spectrum coding
Strongest useful signal also can be allowed to the waveform adder for the same code sequence that multiple paths are come to be strengthened, have to reach
The anti-multipath jamming of effect.
In the following, in conjunction with the example of a concrete application, to vehicle the setting of auxiliary communication system and communication process again into
Row illustrates.
As shown in figure 3, the base type of most common high ferro train is 8 section car bodies at present, it is arranged one after every section car body
A vehicle-mounted optical network communication node, therefore it is 7 to take n in this example.Usual length over ends of body is 25 meters, that is to say, that two vehicle-mounted light
Spacing between network communication node is 25 meters.Herein for the ease of operation, we are approximately 24 meters to calculate.
It can be calculated according to l=L × (1-1/n), the spacing of two neighboring ground network node group 24 is 28 meters.This
Sample is formed the vernier that a step pitch is 4 meters, in high iron car when high ferro moves forward between In-vehicle networking and ground network
It travels forward every 28 meters, 7 communication nodes on vehicle will be communicated successively with 7 nodes on ground respectively.
When first communication node 13_1 ON TRAINS is communicated with the Current terrestrial network node N+1 having been switched on, when
Preceding ground network node N+1 receives the first radio spread spectrum communication signal (PN+ train rows that first communication node 13_1 is sent
Sail conditional code), and believe the certification of the first radio spread spectrum communication signal, Current terrestrial network node N+1 after being verified
Breath and area code are sent to railway operation control centre 21 by ground passive optical network 23 and railway special communication network 22,
So that railway operation control centre 21 generates activation instruction, control is opened adjacent with Current terrestrial network node N+1 and is in
Next ground network node N on train direction of travel.
Ground network node N+1 also can be by the train operation instruction code issued from railway operation control centre 21 with first
It is sent in the interactive process of a communication node 13_1 so that train receives the instruction during advancing.Ground network
Node N+1 sends radio spread spectrum communication signal (PN+ train operations instruction code), is received by first communication node 13_1, and
Be reported to vehicle-mounted control center 11.
Also, while first communication node 13_1 ON TRAINS is communicated with ground network node N+1, ON TRAINS
The last one communication node 13_8 also communicated with the ground network node N+7 having been switched on, by sending the first wireless frequency expansion
The command information (PN+ node out codes code) of the closing ground network node carried in signal of communication, makes train pass through
Ground network node N+7 on section is closed.
When train moves forward 4 meters (step pitch L/n), vehicle-mounted optical network communication node 13_7 will be with ground network section
Point N+6 communications, and vehicle-mounted optical network communication node 13_1 will be detached from communication in ground network node N+1；
When train continues to 4 meters of Forward, vehicle-mounted optical network communication node 13_6 will be communicated with ground node N+5, and vehicle-mounted
Optical network communication node 13_7 is communicated with ground N+6 disengagings；And so on, when train moves forward 28 meters, that is, when L, vehicle
Carrying optical network communication node 13_1 will meet with ground network node N and be communicated (while vehicle-mounted optical network communication node 13_
8 are also communicated with N+6, and train is made to be closed by the ground network node N+7 on section), in this way, being transported forward in train
When row distance L, vehicle-mounted node 13_1~13_8 carries out communicating for 8 times altogether with ground node N~N+6, and greatly improve system can
By property.
When the precision of system requirements is not achieved in stepping accuracy, step pitch can be also segmented, such as in upper example, L=28, レ=
24, n=7, step pitch is 4 meters.When 1 meter of location required precision, the following two kinds mode may be used to realize and improve location precision
Requirement.
The first, can add at 1 meter, 2 meters, 3 meters after other each vehicle-mounted optical network communication nodes in addition to 13_8
Fill three spread spectrum communication transceivers so that for train when carrying out, all there are one communication equipments and ground network node for often one meter of traveling
Communication.
In this way, vehicle-mounted optical network communication node can reach 28 or more, the every traveling L distances of train, the 28 of front on vehicle
7 nodes on a communication node and ground carry out 28 communication, can not only improve location precision, can also greatly promote logical
The reliability of letter.
Second, can in the case where not changing vehicle-mounted optical network communication number of nodes, 1 after each ground network node
Rice, 2 meters, 3 meters place install additional three transceivers, again such that train carry out when, often advance one meter all there are one communication equipment and one
A ground network node communication.
In this way, the every traveling L distances of train, 28 nodes on vehicle on 7 communication nodes and ground of front carry out 28 times
Communication, can not only improve location precision, can also greatly promote the reliability of communication.
Train provided in an embodiment of the present invention positioning and speed-measuring method be with being implemented in above-mentioned vehicle in auxiliary communication system,
In, train is positioned and tests the speed and can mainly be completed by vehicle-mounted control center, or by railway operation control centre Lai complete
At.
In the following, two kinds of execution methods are introduced respectively.
By vehicle-mounted control center Lai the main main implementation procedure for completing train positioning and speed-measuring method as shown in figure 4, packet
Include following steps：
Step 410, vehicle-mounted control center sends first control signal so that vehicle-mounted optical network communication node sends out the first nothing
Line spread spectrum communications signals；
Specifically, vehicle-mounted control center can be synchronous with the power plant of train, and when launch train, vehicle-mounted control
Center just sends first control signal by vehicle-mounted passive optical-fiber network to vehicle-mounted optical network communication node, to each vehicle-mounted light net
Network communication node emits the first radio spread spectrum communication signal.
In order to which the ground network node being laid between rail can accurately receive the first radio spread spectrum communication signal, vehicle
The radiation direction of the first radio spread spectrum communication signal of optical network communication node transmitting is carried downward vertically in This train is bound for XXX.
It may include the spreading code of vehicle-mounted optical network communication node in the first radio spread spectrum communication signal；It is taken in spreading code
Authentication information with vehicle-mounted optical network communication node and train operation state information, to ground network node to train
Information is authenticated, and the interaction of train operation state information is completed after certification.
Step 420, the first ground network node in the first ground network group of nodes is according to railway operation control centre
The first spreading code issued and the first radio spread spectrum communication signal listened to, are authenticated train information；
Wherein, the first ground network group of nodes includes at least one ground network node group, each ground network node
Group includes at least one ground network node；
First ground network group of nodes is in the state being activated at this time.Specific activation can be passed through
Railway operation control centre issues activation according to current train operating condition, to the ground network node on each railroad track and refers to
It enables completing.Detailed description has been carried out when system is introduced above, then this is repeated no more.Activation every time
It can be single ground network node, can also be every time one or more ground network node groups of unlatching simultaneously, specifically
It is determined according to the configuration parameter of railway operation control centre.In short, the activation of ground network node (group), and to train
The monitoring that vehicle-mounted optical network communication node sends out the first radio spread spectrum communication signal be it is relevant, in other words, along track on
Which ground network node (group) is activated time in which, is relevant with the running position of train.
In this step, if certification passes through, show that the first radio spread spectrum communication signal listened to comes from one
A authorized user, i.e., certain the train number train supervised by railway transportation management system show to listen to if certification does not pass through
Radio spread spectrum communication signal is interference signal or comes from other objects etc. outside regulatory responsibility.
Step 430, when certification by when, the first ground network node send the second radio spread spectrum communication signal；
Wherein, the second radio spread spectrum communication signal includes authentication information and the region generation of the first ground network node
Code；Area code is identifying the location information of ground network node.
Therefore, according to the location information of the ground network node carried in the second radio spread spectrum communication signal, so that it may with
To the real-time position information of train.
Second radio spread spectrum communication signal can also be arranged on demand, coding form and the first radio spread spectrum communication signal phase
Together.
Step 440, vehicle-mounted optical network communication node receives the second wireless communication signals that the first ground network node is sent,
And it is transmitted to vehicle-mounted control center；
Authentication information and area of the vehicle-mounted control center to the second wireless communication signals of vehicle-mounted optical network communication node-node transmission
Field code carries out dissection process, you can to obtain the current location information of train.
Step 450, vehicle-mounted control center to one or more vehicle-mounted optical network communication node-node transmission in certain time the
The authentication information and area code of two wireless communication signals carry out dissection process, obtain the real-time position information and/or row of train
Sail velocity information.
Specifically, authentication information and area code of the vehicle-mounted control center to the second wireless communication signals in certain time
Carry out dissection process, so that it may with the real-time position information being sequentially arranged on a timeline.When according to former and later two
Between the location information put, so that it may to calculate the driving speed information of train.
By railway operation control centre Lai the main main implementation procedure such as Fig. 5 institutes for completing train positioning and speed-measuring method
Show, includes the following steps：
Step 510, vehicle-mounted control center sends first control signal so that vehicle-mounted optical network communication node sends out the first nothing
Line spread spectrum communications signals；
The specific execution method of this step is identical as above-mentioned steps 410, repeats no more.
Step 520, the first ground network node in the first ground network group of nodes is according to railway operation control centre
The first spreading code issued and the first radio spread spectrum communication signal listened to, are authenticated train information；
The specific execution method of this step is identical as above-mentioned steps 420, repeats no more.
Step 530, when certification by when, the first ground network node is by the first radio spread spectrum communication signal, the first ground
The authentication information and area code of network node are sent to railway fortune by ground passive optical network and railway special communication network
Row control centre；
Specifically, can realize the signal of only minimum delay using ground passive optical network and railway special communication network
Transmission.When the first ground network node in the first ground network group of nodes listens to the first radio spread spectrum communication signal and right
The authentification of message of train by when, the first ground network node is by the first radio spread spectrum communication signal, ground network node group
Authentication information and area code are sent to railway operation control centre.Railway operation control centre is according to the first radio spread spectrum communication
Signal can get train information, and the train can be determined according to the authentication information of ground network node group and area code
Current track, location information.In addition, railway operation control centre can also arrive according to the first radio spread spectrum communication signal acquisition
Train status information,
Step 540, certification of the railway operation control centre to the first radio spread spectrum communication signal, ground network node
Information and area code carry out dissection process, obtain the real-time position information and/or driving speed information of train.
Specifically, railway operation control centre determines train according to the first radio spread spectrum communication signal being currently received
Information, and the current orbit information and location information of ground network node is determined according to authentication information and area code；Railway is transported
Row control centre determines the real-time position information of the train further according to the orbit information and location information of ground network node；
Railway operation control centre determines the traveling of train according to the first radio spread spectrum communication signal in certain time
Velocity information, can be specifically railway operation control centre obtain train information it is corresponding it is current before the first reception
The orbit information and location information of the ground network node arrived, and according to the orbit information at the first moment and location information, current
Orbit information and the time difference between location information and the first moment and current time, be calculated train traveling speed
Spend information.
The train positioning of the present invention and speed-measuring method, provide a kind of car-ground radio spread spectrum communication pattern based on along rail,
It can carry out user to authorize, the accurate information for confirming train, and can be intelligentized according to train traveling situation, intelligentized unlatching
With closing ground along rail communication node, prevent any invalid information from invading, it is compatible with existing train communication system, it can be each other
Backup increases reliability.What can reliably work under geographical conditions, road conditions condition and weather conditions in office, in positioning
Simultaneously test the speed to train, and can according to needing to configure communication node, to meet the requirement of different positioning accuracy,
Realize that high-precision train is positioned and tested the speed in real time.
Professional should further appreciate that, described in conjunction with the examples disclosed in the embodiments of the present disclosure
Unit and algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, hard in order to clearly demonstrate
The interchangeability of part and software generally describes each exemplary composition and step according to function in the above description.
These functions are implemented in hardware or software actually, depend on the specific application and design constraint of technical solution.
Professional technician can use different methods to achieve the described function each specific application, but this realization
It should not be considered as beyond the scope of the present invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can use hardware, processor to execute
The combination of software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only memory
(ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technical field
In any other form of storage medium well known to interior.
Above-described specific implementation mode has carried out further the purpose of the present invention, technical solution and advantageous effect
It is described in detail, it should be understood that the foregoing is merely the specific implementation mode of the present invention, is not intended to limit the present invention
Protection domain, all within the spirits and principles of the present invention, any modification, equivalent substitution, improvement and etc. done should all include
Within protection scope of the present invention.
Claims (10)
1. a kind of train positioning and speed-measuring method, which is characterized in that the train positioning and speed-measuring method include：
Vehicle-mounted control center sends first control signal so that it is logical that the vehicle-mounted optical network communication node sends out the first wireless frequency expansion
Believe signal；The first radio spread spectrum communication signal includes the spreading code of the vehicle-mounted optical network communication node；The spreading code
Carry the authentication information of the vehicle-mounted optical network communication node；
The first ground network node in the first ground network group of nodes issued according to railway operation control centre
One spreading code and the first radio spread spectrum communication signal listened to, are authenticated train information；First terrestrial network
Network group of nodes includes at least one ground network node group, and each ground network node group includes at least one ground network section
Point；
When certification by when, the first ground network node sends the second radio spread spectrum communication signal；Described second wireless expansion
Frequency signal of communication includes the authentication information and area code of the first ground network node；The area code is to identify
State the location information of ground network node；
The vehicle-mounted optical network communication node receives second wireless communication signals that the first ground network node is sent,
And it is transmitted to the vehicle-mounted control center；
Second nothing of the vehicle-mounted control center to one or more vehicle-mounted optical network communication node-node transmissions in certain time
The authentication information and area code of line signal of communication carry out dissection process, obtain the real-time position information and/or row of the train
Sail velocity information.
2. train positioning according to claim 1 and speed-measuring method, which is characterized in that the vehicle-mounted control center is according to one
The authentication information to second wireless communication signals of the vehicle-mounted optical network communication node-node transmission of interior one or more of fixing time and
Area code carries out dissection process, and the real-time position information and/or driving speed information for obtaining the train specifically include：
The vehicle-mounted control center is according to the authentication information and area code of second wireless communication signals being currently received
Determine the ground network node current orbit information and location information；
The vehicle-mounted control center determines the train according to the ground network node current orbit information and location information
Real-time position information；And/or
The certification for second wireless communication signals that the vehicle-mounted control center is arrived according to the first reception before current
Information and area code determine the ground network node first moment orbit information and location information；And according to institute
State orbit information and location information, current orbit information and location information and first moment at the first moment with it is current when
The driving speed information of the train is calculated in time difference between quarter.
3. train according to claim 1 positioning and speed-measuring method, which is characterized in that the method further includes：
When certification by when, the first ground network node is by the first radio spread spectrum communication signal, first ground
The authentication information and area code of network node are sent by the ground passive optical network and the railway special communication network
To the railway operation control centre；
Authentication information of the railway operation control centre to the first radio spread spectrum communication signal, the ground network node
Dissection process is carried out with area code, obtains the real-time position information and/or driving speed information of the train.
4. train positioning according to claim 3 and speed-measuring method, which is characterized in that the railway operation control centre pair
The first radio spread spectrum communication signal, the authentication information of the ground network node and area code carry out dissection process, obtain
Real-time position information and/or driving speed information to the train specifically include：
The railway operation control centre determines the train according to the first radio spread spectrum communication signal being currently received
Information, and determine that the current orbit information of the ground network node and position are believed according to the authentication information and area code
Breath；
The railway operation control centre determines the train according to the orbit information and location information of the ground network node
Real-time position information；And/or
Information that the railway operation control centre obtains the train it is corresponding it is current before the institute that arrives of the first reception
State the orbit information and location information of ground network node；And according to the orbit information at first moment and location information, when
Preceding orbit information and location information and the time difference between the first moment and current time, is calculated the train
Driving speed information.
5. train according to claim 1 positioning and speed-measuring method, which is characterized in that the method further includes：
The railway operation control centre believes according to the certification of the first radio spread spectrum communication signal, the ground network node
Breath and area code generate the second activation instruction, and are issued to by the railway special communication network and ground passive optical network
The second ground network group of nodes being disposed adjacent with the first ground network group of nodes along the travel direction of the train,
So that the second ground network group of nodes is converted to listening state by closed state；The second ground network group of nodes
Including at least one ground network node group.
6. train according to claim 1 positioning and speed-measuring method, which is characterized in that the vehicle-mounted control center sends the
One control signal so that the vehicle-mounted optical network communication node sends out the first radio spread spectrum communication signal and specifically includes：
The vehicle-mounted control center sends first control signal so that except being set to the vehicle-mounted optical network communication node of last one
The first wireless communication signals that other outer vehicle-mounted optical network communication nodes are sent out include spreading code and train operation state information；
And
The vehicle-mounted control center sends first control signal so that described to be set to the vehicle-mounted optical network communication section of last one
The first wireless communication signals that point is sent out include spreading code and command information；Described instruction information is to close ground network section
The command information of point.
7. train according to claim 6 positioning and speed-measuring method, which is characterized in that the method further includes：
The ground network node in listening state listen to that the vehicle-mounted optical network communication node sends out closing
When the command information of ground network node, by the ground network section where the ground network node or the ground network node
Whole ground network nodes in point group are converted to close off state by listening state.
8. train positioning according to claim 1 and speed-measuring method, which is characterized in that multiple vehicle-mounted optical network communications
Node spaced set, multiple ground network node group spaced sets, the two neighboring vehicle-mounted optical network communication section
The spacing L between spacing l and two neighboring ground network node group between point meets l=L × (1-1/n)；Wherein n is described
The quantity of vehicle-mounted optical network communication node.
9. train positioning according to claim 1 and speed-measuring method, which is characterized in that the first radio spread spectrum communication letter
Number further include plain code, carries train operation state information and/or command information；The second radio spread spectrum communication signal also wraps
Plain code is included, command information is carried.
10. train according to claim 1 positioning and speed-measuring method, which is characterized in that the method further includes：
The ground network node that the ground network node group of positioning accuracy parameter setting one according to the train includes
Quantity；
Wherein, multiple ground network node spaced sets in the ground network node group；Ground network node edge
The direction of train rail is set in turn between two rails of the train rail；Or
Determine that the spread spectrum communication that a vehicle-mounted optical network communication node includes is received according to the positioning accuracy parameter of the train
The quantity of hair machine；
Wherein, multiple spread spectrum communication transceiver spaced sets that a vehicle-mounted optical network communication node includes.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| RU2793551C1 (en) * | 2022-11-14 | 2023-04-04 | Владимир Васильевич Чернявец | Locomotive speed meter |
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Effective date of registration: 20220215 Address after: 101100 01-0996, floor 3, No. 99, Shuixian West Road, Tongzhou District, Beijing Patentee after: BEIJING PHOENIX HUITONG TECHNOLOGY Co.,Ltd. Patentee after: Phoenix Huitong (Hangzhou) Technology Co., Ltd Address before: No. 732, floor 7, block a, Huatong building, No. 19, Chegongzhuang West Road, Haidian District, Beijing 100048 Patentee before: BEIJING PHOENIX HUITONG TECHNOLOGY Co.,Ltd. |