CN1247404C - Wireless locomotive signal system preset polling optimized control method - Google Patents
Wireless locomotive signal system preset polling optimized control method Download PDFInfo
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- CN1247404C CN1247404C CN 200310100355 CN200310100355A CN1247404C CN 1247404 C CN1247404 C CN 1247404C CN 200310100355 CN200310100355 CN 200310100355 CN 200310100355 A CN200310100355 A CN 200310100355A CN 1247404 C CN1247404 C CN 1247404C
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Abstract
The present invention discloses a self-discipline polling optimizing control method for wireless locomotive signal systems, which is used for a wireless locomotive signal system. The method comprises the following steps: (1), when trains run over an approach responser, a vehicular data transmitting broadcasting station obtains a registration address and frequency use information of a station from the approach responser; (2), after the vehicular data transmitting broadcasting station detects a registration time slot in a polling cycle, the broadcasting station requests registration to a station control center in a calling mode; (3), after the registration is finished, the station control center carries out polling control over each registered train in the calling mode; (4), after the trains run over an outbound responser, the station control center cancels the trains. By using the method, the integrity of communication processes each time is ensured; in a polling process and a registration process, an interleaving technique and a three-dimensional control technique are used for effectively shortening the strain time of locomotive signals and ensuring safe and reliable signal transmission. Consequently, the present invention largely enhances the operating safety and efficiency of the whole locomotive signal system.
Description
Technical field
The present invention relates to a kind of in wireless cab signal system to the locomotive at the turnover station poll of restraining oneself, and effectively shorten the cab signal strain time, the method for guarantee information reliable transmission belongs to the railway signal technology field.
Background technology
Existing railway signal system is commonly referred to as the universal signal system, and it is the wired system that is based upon on the ground rail circuit base, can not satisfy actual needs in some particular surroundings, special area and the high speed railway in future.For this reason, the applicant has developed the cab signal system based on wireless data transmission network.
Wireless cab signal system and general-purpose locomotive signal have very big difference.At first be the transmission medium difference, wireless cab signal system is based on wireless channel, and the general-purpose locomotive signal is based on track circuit; Next is the signal kinds difference, and the control signal of wireless cab signal system is that the general-purpose locomotive signal system of numeral then adopts analog signal.In addition, both control mechanisms are also different, wireless cab signal system is a kind of common control system, be that the radio locomotive signal wayside equipment adopts time division multiplexing mode or frequency division multiplexing mode to control a plurality of trains simultaneously, the general-purpose locomotive signal then is a kind of distributed control mode, onboard control device can only receive the information in the track circuit of locomotive place, and it and track circuit are to concern one to one.Therefore, for wireless cab signal system, many control methods that are used for the wire signal system are no longer suitable, the control method that must make new advances at its characteristics exploitation.
According to need of real project, the condition that need satisfy as the wireless data transmission network on wireless cab signal system basis comprises following content:
(1) satisfies the real time of data transmission requirement, guarantee the strain time of radio locomotive signal, guarantee the train quantity of the maximum control in station, the required time of redundant measure in the guarantee information transmission course.
(2) satisfy the requirement of information transmitted amount.
(3) satisfy station and specify between the train and set up well-determined radio channel.
(4) satisfy the bit error ratio and the reliability requirement of data transmission.
(5) satisfy in the station institute's linchpin train all within the field intensity coverage.
Summary of the invention
The object of the present invention is to provide a kind of control method that is suitable for wireless cab signal system.This method can realize the locomotive at the turnover station poll of restraining oneself, thereby locomotive is carried out Real time identification and control.In the self-discipline polling procedure, it can effectively shorten the strain time of cab signal by the multiple technologies means, and the transmission of energy guarantee information is reliable and secure.
For realizing above-mentioned goal of the invention, the present invention adopts following technical scheme:
A kind of wireless cab signal system self-discipline poll optimal control method is used for wireless cab signal system, and this system comprises station control center and at least one mobile unit; Mobile unit comprises data radio station, comprises data radio station in the station control center, near responser and departures responser, lays respectively at the track limit of both sides, station near responser and departures responser, it is characterized in that:
This method comprises the steps:
When (1) train crosses near responser, registered address and the frequency of utilization information of vehicle-mounted data radio station from obtain this station near responser;
(2) vehicle-mounted data radio station is sought registration in the main mode of exhaling to station control center after detecting the interior discovery timeslot of polling cycle;
(3) after registration was finished, station control center was carried out poll control in the main mode of exhaling to each train of registering;
(4) after train crossed the departures responser, station control center was nullified it.
Wireless cab signal system self-discipline poll optimal control method of the present invention can fully satisfy the actual needs of wireless cab signal system control.Its employing polling mode is carried out the station telecommunication between mobile unit and the ground, has ensured the integraty of communication process each time; In whole control process, also utilize interleaving technology and three-dimensional control technology, effectively shorten the time of cab signal strain, guarantee that the signal transmission security is reliable, thereby improve the safety and the efficient of the operation of whole cab signal system greatly.
Description of drawings
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the system architecture diagram of whole wireless cab signal system.
Fig. 2 adopts different frequency for station in the wireless cab signal system and controls respectively/the frequency allocation scheme drawing of down train.
Fig. 3 is the diagram of circuit of wireless cab signal system self-discipline poll optimal control method of the present invention.
Time slot allocation figure when Fig. 4 adopts time division multiplexing mode that train is controlled for station control center.
Fig. 5 is the schematic diagram of the interleaving technology that adopts in the wireless data transmission process between control center AT STATION and the vehicle radio station.
Fig. 6 shortens the time slot allocation scheme drawing of radio locomotive signal strain during the time for utilizing the variable cycle method in the method for the invention.
The specific embodiment
Wireless cab signal system self-discipline poll optimal control method of the present invention is applied in the wireless cab signal system.As shown in Figure 1, this system comprises station control center and at least one mobile unit; Mobile unit is installed on the locomotive, comprises on-vehicle host, vehicle-mounted requestor, cab signal machine and data radio station, and on-vehicle host is connected respectively with data radio station, vehicle-mounted requestor, cab signal machine on the locomotive; Station control center is installed in the station, comprises station main control system, data radio station, near responser and departures responser, and the station main control system is connected with the station interlocking main frame with data radio station.
Above-mentioned wireless cab signal system adopts data radio station to constitute wireless data transmission network.By on every locomotive, vehicle radio station being set, each station setting base station, and unified as prescribed is provided with the radio station numbering.Base station and train-installed radio station constitute the star-network structure, and wherein station radio set is a network center, and vehicle radio station is a node of network.Train in station and the network uses same frequency, adopts time division multiplexing mode to utilize channel resource.This wireless cab signal system is a kind of near the continous way radio locomotive signal, and promptly train is from a station during to the operation of another station, and it only just has cab signal closing on the station, and this is determined by railway semi-automatic block system running mode.The type only has wireless signal field to cover AT STATION on every side, therefore is fit to realize with common data radio station.The employed wireless network of this wireless cab signal system has following technical characterstic:
1. possess dynamic group net ability and network mobility
Because train is constantly motion along the railway, is uncertain to each station in member and the quantity that difference constitutes network constantly, is a dynamic combined and separating process, therefore, the composition of network is that open, dynamic.Simultaneously, the overall network of each station formation has movability along the line.
2. frequency is arranged alternately between the station
For fear of producing co-channel interference, use at each station frequency translation in the radio station.As shown in Figure 2,2 radio station are used at each station, adopt different frequency, control respectively/down train.Wherein F2, F4, F6 are up train frequency of utilization, and F1, F3, F5 are the down train frequency of utilization.On/down train employing different frequency, can prevent that the data of issuing the up train from being received by down train, avoids unnecessary conflict.
In wireless cab signal system, per three stations are used alternatingly a different set of frequency, to avoid the co-channel interference between the station.Train-installed main frame obtains the frequency that next station radio set uses, and resets the frequency of operation of vehicle radio station automatically by induction ground transponder data, keeps corresponding with ground.Guarantee the proper communication between the car ground.
3. addressing mode
Data radio station adopts addressing mode in the wireless cab signal system.Because all radio station, same station all are operated in same frequency, can both receive the information that the other side sends each other, cause communication confusion easily.Therefore in the Frame of transmission, add address information by the radio station numbering, after the radio station receives a frame information, address in the information frame and own numbering are contrasted, if identical then be confirmed to be the information of oneself and it is passed to main control system, if difference then abandon automatically.
4. avoid transmission frame conflict and communication blocking
Wireless cab signal system prevents the conflict of transmission network frame by time-division multiplex communication mode and communication protocol.The communication protocol strict difinition time slot of communication, stipulated the communication sequence of corresponding time slot, the passive relation of the master of station and train.Thereby guarantee that communicating by letter between station and the train carry out in order, avoided the frame conflict of transmission course.In communication process, owing to reason vehicle radio station or station radio set such as be interfered may occur lockedly,, also need the radio station to have overtime detection, function such as reset in order to prevent communication disruption.
5. frame structure is variable
For real-time and the reliability that guarantees radio locomotive signal, the information of transmission over radio is divided into three types.Type I information (I): Train Control signal essential information; Second category information (II): contain and connect/dispatch a car station track number, running number, train actual speed and maximum permission speed, train position etc.In addition, under the prerequisite that transmission delay allows, also can transmit the information (III) of the 3rd class non-safety matter: the different content information that comprises aspects such as the worker is engaged in, electricity affair, engineering.According to different needs can select long, in, the standard format in short message cycle.
As shown in Figure 3, self-discipline poll optimal control method of the present invention comprises the steps:
When (1) train crosses near responser, registered address and the frequency of utilization information of vehicle-mounted data radio station from obtain this station near responser.
When train was pressed near responser, train needed request registration to network.If at this moment train sends log-on message immediately, not only upset other communication, oneself is not registered yet.Therefore we have increased a discovery timeslot in a poll control cycle, and when there was a train at the station, a control cycle was a communication time slot and a discovery timeslot; When there were two trains at the station, a control cycle was two communication time slots and a discovery timeslot, and the rest may be inferred.Train forms the log-on message frame from obtain the registered address and the frequency of utilization information of our station near responser, if but not in discovery timeslot, do not send log-on message, only detect discovery timeslot, just send log-on message. at once
(2) vehicle-mounted data radio station is sought registration in the main mode of exhaling to station control center after detecting the interior discovery timeslot of polling cycle.
Train determines whether to be in discovery timeslot by the detected carrier mode, mobile unit carries out the primary carrier detection for per 20 milliseconds, and continuous 3 no signals just are judged to be discovery timeslot, begin to send the registration request, once registration unsuccessful can be carried out for the second time, for the third time, until succeeding in registration.This train registration process is to finish in the mode that the train master exhales the station to reply.
(3) after registration was finished, station control center was carried out poll control in the main mode of exhaling to each train of registering.
As shown in Figure 4, in wireless cab signal system, station control center adopts each train in the time division multiplexing mode control tube.It exhales each train according to the order master of train in registration table, distribute time slot for each train, each time slot comprises transmission and receives two parts that all train polls are increased a discovery timeslot for one time again finish a communication cycle, communication cycle changes along with the variation of way traffic number.In this communication process, owing to all radio station in the station all are operated on the same frequency, one of them radio station is sent other all radio station of information and can be received.When two radio station just in communication process, the proper communication that information can be upset two radio station, front is sent in the 3rd radio station.Therefore the station to the control of each train must strictness in order poll carry out, each train must be accomplished to restrain oneself, taking turns to oneself can respond, otherwise can only wait for.Therefore, it is a kind of by the main signalling methods of exhaling train to reply in station that this communication pattern belongs to, opposite with above-mentioned registration process, so this wireless cab signal system variable self-discipline poll mode of operation that is a kind of principal and subordinate.This mode can guarantee the needs of normal polling communication, can make the train registration near the station again.
The poll mode of operation that above-mentioned this principal and subordinate is variable has been stipulated station and the master passive relation of train in the different moment, thereby guarantees that communicating by letter between station and the train carry out in order, has avoided the frame conflict of transmission course.
(4) after train crossed the departures responser, station control center was nullified it.
The present invention also according to the needs of real work, has proposed to reduce the cab signal strain time and the technical measures that improve data transmission credibility in the polling procedure, so that this method further is optimized except above-mentioned principal and subordinate is provided variable poll method of work.Below this is illustrated.
The strain time of cab signal refers to that wayside equipment issues a signal to mobile unit and accepts the back and be presented at the time used on the cab signal machine.The strain time of cab signal and the train quantity of control, information transmitted amount, speed of transmission, signaling mode, redundant measure are relevant.The strain time is an important indicator of cab signal, and it directly influences driving efficient and traffic safety.The strain time is short more, and the efficient of driver control train is high more.And train running speed is high more, requires the strain time of cab signal short more.At present general-purpose locomotive signal strain time of receiving frequency-shift signaling be about 1.7 seconds～2.3 seconds, the signal strain time that receives other standard is also longer.Because the general-purpose locomotive signal adopts the corresponding chassis of track section circuit to carry the distribution control mode of equipment, the strain matter of time relatively easily solves.And radio locomotive signal adopts the common control system of one-to-many, one cover wayside equipment is controlled in the station and all trains at contiguous station simultaneously, need a control cycle is divided into several control time slots for this reason, finish the signal conditioning of corresponding train in each time slot, therefore, strain time that control cycle is exactly a radio locomotive signal.For shortening this strain time, can adopt following technical measures:
1. utilize interleaving technology to shorten the strain time of radio locomotive signal
Owing to improve the bit error ratio that the transmission over radio baud rate can cause exponential growth, it is unrealistic to shorten the radio locomotive signal strain time with the method that improves Transmission bit rate.Data display radio cab signal mainly is subjected to cause continuous repetitive requests wireless data transmission, so wireless data transmission should adopt short message frame structure and forward error correcting (FEC) mode in the radio locomotive signal because the burst error that fast fading causes influences.The short message frame can effectively be avoided fast fading and disturb, and reduces because re-transmission causes decrease in efficiency.Forward error correcting then can make the bit error ratio reach the regulation requirement.
So-called interleaving technology as shown in Figure 5, its particular content is such: on this variable-parameter channel of mobile communication, bit error often is that bunchiness takes place.This is can have influence on a string in succession bit owing to continue long deep fade valley point.Yet, channel encoding only when detecting and proofreading and correct single error and not oversize mistake string just effectively.In order to address this problem, can be the scattered method of the subsequent bits in a piece of news, promptly the subsequent bits in a piece of news is sent out in non-mode in succession.Like this, even the bunchiness mistake has taken place in transmission course, when reverting to the message of a subsequent bits string, mistake also just becomes single (or length is very short), at this moment corrects mistake with the channel encoding error correction again, recovers former message.
Interleaving technology generally is used for improving speech quality, and it reaches the purpose that improves speech quality by balanced error code, but can not reduce error code.But we utilize interleaving technology can improve FEC error correction efficient, save the time of on-air radio transmission data, thereby reach the purpose specific practice that shortens the strain time be: in order to satisfy the bit error ratio of radio locomotive signal requirement, information redundancy coding (the n of forward error correcting FEC, k) must be provided with the ratio of effective information k and redundant information (n-k) according to local maximum the decline, enough redundant informations must be arranged, just can reach the effect of forward error correcting.If before this information transmitted is interweaved, local big decline is disperseed, and can reach same error correction effect with less redundant information (n-k) like this.Owing to reduced aerial information transmitted amount, shortened the transmission over radio time, and interweaved and conciliate interleaving process at both ends computer-internal hardware and finish, the time that interweaves can ignore.Shorten the transmission over radio time, be equivalent to shorten the control time slot, promptly shortened the strain time.For example guaranteeing to correct under the prerequisite of same burst mistake, need be l with correcting burst-length without the FEC of interleaving technology
bThe BCH of≤7bits (31,16) sign indicating number carries out error correction, and this code efficiency only is 0.52; And be l with correcting burst-length only behind the FEC of employing interleaving technology
bThe error correction of the R-S of≤3bits (16,12) sign indicating number gets final product, and this code efficiency is 0.75.If Transmission bit rate 2400b/S, transmission effective information 160bit, adopt the FEC of interleaving technology can make transmission efficiency improve 31%, save 20 milliseconds of on-air radio transmission times, for the wireless cab signal system of control 5 row trains, total strain time has shortened 1 second, and its effect is very tangible.
2. shorten the radio locomotive signal strain time by changing control cycle
The station main control system adopts in the time division multiplex inquiry control station and all trains at contiguous station.Control cycle T is divided into n control time slot t
1, t
2T
n, the processing time of respectively corresponding each train.A control time slot comprises that the station main control system receives the lock file time, generate the cab signal time according to interlocking condition, engine number and train position, with the used transmission over radio times of information such as train position, speed and cab signal receipt that information such as cab signal send on the corresponding train and the reception mobile unit is sent here.A control cycle T=t
1+ t
2+ ... + t
n
The main control system maximum as required train of controlling in station is counted n and is designed, and promptly a control cycle is fixed and is set to n time slot.At a time train quantity is uncertain owing to the station, most of times of station in fact, half of maximum control train number is only arranged.With fixed cycle control train is a kind of time waste, not only influences efficient, and has prolonged the strain time of cab signal.
As shown in Figure 6, adopt the mode of train registration to determine control cycle in the method for the invention, register several cars the several Control time slot is set.Control cycle is dynamic change in whole Train Control process.This method can either satisfy the train quantity of maximum demand control, is constantly at utmost shortening the cab signal strain time mostly again.
3. shorten the radio locomotive signal strain time by changing time-slot sequence
Since in the wireless cab signal system station main control system according to the rules time gap read the interlocking data, by the interlocking data are analyzed, if find that wherein certain train signal changes, to handle this train immediately and be set at highest priority, and change original polling sequence, be about to the highest train processing time slot of preceence and come the control cycle foremost.When the ground signal changed, the onboard wireless cab signal was followed variation immediately.Can in time handle the train that signal changes like this, just handle in the time of need not waiting until poll to this train, consequently shorten the strain time of radio locomotive signal greatly.
No matter be the general-purpose locomotive signal that radio locomotive signal also is based on track circuit, the reliability of system and safety are vital.The reliability of wireless data transmission is crucial in the radio locomotive signal, the present invention is according to the needs of train safe control, the characteristics of combining wireless data transmission propose the three-dimensional method of controlling, and can guarantee reliability and safety with wireless channel transmission Train Control data.
So-called three-dimensional control is meant that the information content has only and satisfies address code, timestamp and registry information simultaneously and require to be only actv.:
(1) in the wireless cab signal system, each station and mobile unit all have fixed address, send with reception information is strict to carry out by the address, and for the information of address mistake, its " mailbox " just refuses to receive.
(2) timestamp of information transfer.Adopt time-division multiplexing method to carry out information transfer in the radio locomotive signal, at any time may be subjected to having a mind to or interference and attack unintentionally, so be provided with timestamp specially in system, promptly any transmission of Information is all titled with time of origin, after exceeding schedule time, effective information is ended.
(3) train registration system.Train in the scheduling administrative area, they have unique train number code, and according to driving plan issue, running number is corresponding with number of registration by the section control center with majesty for running number, only after registration, it could carry out the effective information transmission to the train of any operation in wireless channel.
The above-mentioned three-dimensional mode of utilizing address, timestamp and registration makes two way communication be subjected to strict safety assurance, and promptly the information content has only and satisfies three-dimensional condition simultaneously and be only actv..
In addition, in wireless cab signal system, the information transfer between station control center and the mobile unit not only adopts closed-loop fashion, and promptly both sides reply the affirmation mode, and adopts three two the highly reliable modes of getting to finish in the transmission of the information content and decoding.Sending in the coding all has the CRC error detection, and it can improve system's anti-interference resistance, thereby has also improved reliability of information transmission.The radio station in the information process of transmitting, the error-detection error-correction control technology of employing itself also, this is another measure that improves anti-interference resistance at high band.
Above-mentioned specific embodiment has been described in realization in order to demonstrate the invention.Should be understood that other variation of the present invention and modification it will be apparent to those skilled in the art that the present invention is not limited to the described specific embodiment.Therefore, at the true spirit of the disclosed content of the present invention and any/all modifications, variation or the equivalent transformation in the fundamental principle scope, all belong to claim protection domain of the present invention.
Claims (9)
1. a wireless cab signal system self-discipline poll optimal control method is used for wireless cab signal system, and this system comprises station control center and at least one mobile unit; Mobile unit comprises data radio station, comprises data radio station in the station control center, near responser and departures responser, lays respectively at the track limit of both sides, station near responser and departures responser, it is characterized in that:
This method comprises the steps:
When (1) train crosses near responser, registered address and the frequency of utilization information of vehicle-mounted data radio station from obtain this station near responser;
(2) vehicle-mounted data radio station is sought registration in the main mode of exhaling to station control center after detecting the interior discovery timeslot of polling cycle;
(3) after registration was finished, station control center was carried out poll control in the main mode of exhaling to each train of registering;
(4) after train crossed the departures responser, station control center was nullified it.
2. wireless cab signal system self-discipline poll optimal control method as claimed in claim 1 is characterized in that:
In the wireless communication procedure between described station control center and the mobile unit, the information content adopts the short message frame structure.
3. wireless cab signal system self-discipline poll optimal control method as claimed in claim 1 is characterized in that:
Adopt forward error correction mode in the wireless communication procedure between described station control center and the mobile unit.
4. wireless cab signal system self-discipline poll optimal control method as claimed in claim 3 is characterized in that:
Before adopting described forward error correction mode, earlier institute's information transmitted is interweaved.
5. wireless cab signal system self-discipline poll optimal control method as claimed in claim 1 is characterized in that:
The middle station control center of described step (3) is carried out the cycle of poll control and is dynamically determined according to the quantity of train to each train of registering.
6. wireless cab signal system self-discipline poll optimal control method as claimed in claim 1 is characterized in that:
In the described step (3), if wherein certain train signal changes, will handle this train immediately and be set at highest priority, and change original polling sequence, the train that preceence is the highest is handled time slot and is come the control cycle foremost.
7. wireless cab signal system self-discipline poll optimal control method as claimed in claim 1 is characterized in that:
The information content between described station control center and the mobile unit meets the requirement of address code, timestamp and registration three aspects simultaneously.
8. wireless cab signal system self-discipline poll optimal control method as claimed in claim 1 is characterized in that:
In the wireless communication procedure between described station control center and the mobile unit, two mode is got in the transmission of the information content and decoding employing three.
9. wireless cab signal system self-discipline poll optimal control method as claimed in claim 1 is characterized in that:
In the described step (2), train determines whether to be in discovery timeslot by the detected carrier mode, and mobile unit carries out the primary carrier detection for per 20 milliseconds, and continuous 3 no signals just are judged to be discovery timeslot, begin to send the registration request.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102355496A (en) * | 2011-09-27 | 2012-02-15 | 中国铁道科学研究院电子计算技术研究所 | Train-ground data communication method |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9733625B2 (en) | 2006-03-20 | 2017-08-15 | General Electric Company | Trip optimization system and method for a train |
| US10308265B2 (en) | 2006-03-20 | 2019-06-04 | Ge Global Sourcing Llc | Vehicle control system and method |
| US10569792B2 (en) | 2006-03-20 | 2020-02-25 | General Electric Company | Vehicle control system and method |
| US8924049B2 (en) | 2003-01-06 | 2014-12-30 | General Electric Company | System and method for controlling movement of vehicles |
| CN100373817C (en) * | 2005-06-10 | 2008-03-05 | 上海新干通通信设备有限公司 | Locomotive number and train number registration and deregistration method in locomotive wireless communication system |
| US8370006B2 (en) * | 2006-03-20 | 2013-02-05 | General Electric Company | Method and apparatus for optimizing a train trip using signal information |
| US8290645B2 (en) | 2006-03-20 | 2012-10-16 | General Electric Company | Method and computer software code for determining a mission plan for a powered system when a desired mission parameter appears unobtainable |
| US9834237B2 (en) | 2012-11-21 | 2017-12-05 | General Electric Company | Route examining system and method |
| CN101549703B (en) * | 2009-06-02 | 2011-09-14 | 北京交大思诺科技有限公司 | A long range active response loop wire set |
| US9669851B2 (en) | 2012-11-21 | 2017-06-06 | General Electric Company | Route examination system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102355496A (en) * | 2011-09-27 | 2012-02-15 | 中国铁道科学研究院电子计算技术研究所 | Train-ground data communication method |
| CN102355496B (en) * | 2011-09-27 | 2014-08-20 | 中国铁道科学研究院电子计算技术研究所 | Train-ground data communication method |
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