CN102139704A - High-accuracy train positioning system based on radio frequency technology and positioning method thereof - Google Patents
High-accuracy train positioning system based on radio frequency technology and positioning method thereof Download PDFInfo
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- CN102139704A CN102139704A CN2011100345874A CN201110034587A CN102139704A CN 102139704 A CN102139704 A CN 102139704A CN 2011100345874 A CN2011100345874 A CN 2011100345874A CN 201110034587 A CN201110034587 A CN 201110034587A CN 102139704 A CN102139704 A CN 102139704A
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Abstract
The invention provides a high-accuracy train positioning system based on the radio frequency technology and a positioning method thereof. The high-accuracy train positioning system comprises a radio frequency card arranged on a trackside fixed object and a reader and a processing computer which are arranged on a rail train, wherein the radio frequency card responds to a transmitting signal sent by the reader and returns a reflected signal; the reader receives and processes the reflected signal returned by the radio frequency card to acquire the card number of the radio frequency card and sends the card number to the processing computer; and the processing computer invokes the database of the radio frequency card to identify the positioning information corresponding to the card number of the radio frequency card. The train positioning system and the positioning method carry forward various advantages of the radio frequency technology, overcome the defects of the prior art and can operate accurately and effectively in severe environment. In addition, the invention also provides an error correction scheme for the positioning system, which further increases the detection accuracy of the train positioning system and meets the high requirements of current rail transit development for the detection system.
Description
Technical field
The present invention relates to track traffic facility detection technique field, particularly a kind of high precision train positioning system and localization method thereof based on radio-frequency technique.
Background technology
Track inspection car is for checking the large-scale dynamic detecting equipment of track disease, elimination accident potential, guide line maintenance, raising circuit ride comfort, guarantee driving safety.It is mainly used in field of track traffic such as train, subway, tramway train.The rail detection system of installing on track inspection car can carry out detection of dynamic to orbit geometry parameter, detects data and transfinites for instructing track division maintain road maintenance, guaranteeing that traffic safety has crucial effect.And these data that transfinite that track inspection car detected need add the mileage mark, and track division just can accurately and apace be determined the position of transfiniting, and as the case may be circuit is keeped in repair and maintenance, eliminate the circuit disease.If the mileage error of the data that transfinite that detect is bigger, searches disease so at the scene and will spend a large amount of time and manpower, sometimes even can't determine the disease position.Thereby rail detection system has higher requirement to the accuracy of mileage.
At present, the mileage location technology that is applied to track inspection car roughly has following three kinds:
At first, be manually to put the mileage method.Manually putting the mileage method is to carry out the observation of track circuit mileage by artificial Zai lookout window, when track inspection car runs to specific mileage place, by artificial input mileage number, carries out the correction of mileage.
This shortcoming of manually putting the mileage method is: increased testing staff's work capacity, made that the detection task is heavier; May import the mileage mistake during operating personal correction, cause system's mileage error; Different people presses correction key time and has difference, strengthens systematic error; Detection is subjected to environmental constraints, manually can't see the mileage board clearly for the not good environment of sighting distances such as night and cause carrying out the mileage correction; Too fast also may the causing manually of train speed can't be seen a kilometer board clearly, causes carrying out the mileage correction.
Secondly, be the photoelectric encoder method of inspection.The photoelectric encoder method of inspection is the mileage mark that obtains by the photoelectric encoder that is installed on the wheel shaft.Photoelectric encoder and wheel shaft connect firmly, and when wheel revolutions one circle, can drive photoelectric encoder and rotate a circle, and the photo electric axis coder can send the pulse of some to system.Because the girth of wheel is known, thereby the distance of each pulse representative can calculate.Checking system just can add up mileage number according to the number of the pulse that photoelectric encoder sends, and forms the mileage mark of checking system self with this.
The shortcoming of this photoelectric encoder method of inspection is: the train long-time running, and wheel self wearing and tearing can cause circumference diminishes, and then the distance of each pulse representative can diminish, thereby causes detecting the error of data; During action such as train braking, wheel can skid, and axletree can not drive the photoelectric encoder rotation, and then causes the error of detection; Owing to site operation reason such as relocate, cause long-chain, short chain or the connection lead of circuit, the mileage saltus step can appear, and these reasons all can cause the calculating mileage of checking system and the error between the actual mileage on the circuit.
Having, is GPS mileage proofreading method again.GPS mileage proofreading method is a positioning function of utilizing GPS, with the GPS receiving system in real time the data of output comprise that the mileage that sets in advance in parameter such as longitude, latitude, direction angle and the data bank mates, mate corresponding mileage number at specific mileage, and mileage number outputed to checking system, system is carried out mileage revise automatically.
The shortcoming of GPS mileage proofreading method is: it is bigger that gps receiver is influenced by Railway Environment, and in the tunnel, mountain valley even bridge etc. block the place that satellite-signal receives, GPS mileage critique system can't be worked; The position error of gps system is bigger, on common line, can reach 5 meters, and along with the raising of train speed, the position error of gps system also can further increase, and can't satisfy the requirement of detection of dynamic train detection precision.
In sum, in view of all there are various problems in the mileage location technology that has various track inspection cars now, can't fully satisfy the needs that actual track train mileage detects.Therefore, we need design a kind of brand new high precision train Positioning Technology, make it to satisfy current track traffic development to the requirements at the higher level that checking system proposed, precisely actv. work in rigorous environment.
Summary of the invention
Main purpose of the present invention is to solve problems of the prior art, and a kind of high precision train positioning system and localization method thereof based on radio-frequency technique is provided.This technology can satisfy current track traffic development to the requirements at the higher level that checking system proposed, can precisely actv. work in rigorous environment.
The objective of the invention is to be achieved by following technical proposals:
A kind of high precision train positioning system based on radio-frequency technique is characterized in that, comprising: the plurality of radio card on the fixture in orbit is set, is arranged at least one reader and process computer on the railcar;
Described radio-frequency card is used to respond transmitting that reader sends, and returns reflected signal; At least the card number that includes this radio-frequency card in the described reflected signal;
Described reader is used to send and transmits; Reception is also handled the reflected signal that radio-frequency card returns, and obtains the card number of this detected radio-frequency card; The detected radio-frequency card card number that is obtained is sent to process computer;
Described process computer links to each other with reader, is used to call identification of radio-frequency card data bank and the corresponding locating information of this detected radio-frequency card card number; Store in the described radio-frequency card data bank and each radio-frequency card card number corresponding radio frequency fastening position information.
Also be provided with error correction systems in the described train positioning system; This error correction systems comprises: photoelectric encoder, accurate counter, Error Calculator and error correction unit;
Described photoelectric encoder is installed on the wheel shaft of railcar, along with the rotation generation impulse singla of railcar wheel shaft;
Described accurate counter links to each other with photoelectric encoder, is used to receive the impulse singla of photoelectric encoder; Receive the actuation signal that reader sends, start counting the photoelectric encoder impulse singla; Receive the termination signal that process computer sends, stop counting the photoelectric encoder impulse singla; The photoelectric encoder pulse count signal value that obtains is sent to Error Calculator;
Described Error Calculator is used for according to this photoelectric encoder pulse count signal value calculation error distance, and error distance is sent to the error correction unit as the error correction values of this detected radio-frequency card locating information;
Described error correction unit is used for according to the error correction values that receives this detected radio-frequency card locating information being revised.
In described error correction systems, also be provided with installation site correction memory cell and reading range correction memory cell;
Described installation site correction memory cell is used to store the installation site correction;
Described reading range correction memory cell is used to store the reading range correction;
Described Error Calculator is used for reading installation site correction and reading range correction that described installation site correction memory cell and reading range correction memory cell are stored; According to the described error distance that calculates and described installation site correction and reading range correction, calculate error correction values, and this error correction values is sent to the error correction unit this radio-frequency card locating information.
Described radio-frequency card is installed on the fixture of track side; Be provided with two readers in this train positioning system, be installed on the both sides of railcar respectively, corresponding with radio-frequency card; Described two readers are arranged on the inboard, compartment or the outside of railcar; Described two readers all are connected with described process computer.
Described reader is arranged in the compartment of railcar, is close to the railcar vehicle window.
Described radio-frequency card is installed in the track bottom side; Described reader correspondence is installed in the bottom side of railcar.
Be connected by RS-232, RS-485 or Ethernet interface between described reader and the process computer.
A kind of high precision train locating method based on radio-frequency technique is characterized in that, comprising:
Transmitting that radio-frequency card response reader on the fixture in orbit sends is set, returns reflected signal; At least the card number that includes this radio-frequency card in the described reflected signal;
Be arranged on the reflected signal that reader receives and the processing radio-frequency card returns on the railcar, obtain the card number of this detected radio-frequency card;
Process computer calls the radio-frequency card data bank, identification and the corresponding locating information of this detected radio-frequency card card number.
Reader also sends actuation signal to accurate counter when sending the radio-frequency card card number to process computer;
Process computer also sends termination signal to accurate counter when identifying the corresponding locating information of detected radio-frequency card card number;
Accurate counter receives actuation signal, starts the counting to the photoelectric encoder impulse singla; Receive termination signal, stop counting the photoelectric encoder impulse singla;
Error Calculator is according to photoelectric encoder pulse count signal value calculation error distance, and with the error correction values of this error distance as this detected radio-frequency card locating information;
The error correction unit is revised radio frequency fastening position information according to this error correction values.
Error Calculator reads the installation site correction of installation site correction cell stores;
Error Calculator reads the reading range correction of reading range correction cell stores;
Error Calculator is calculated the error correction values to this radio-frequency card locating information according to the error distance and installation site correction that reads and the reading range correction that calculate.
By the embodiment of the invention, high precision train positioning system and the localization method thereof of a kind of brand new are provided based on radio-frequency technique.This train positioning system and localization method have been inherited the plurality of advantages of radio-frequency technique, have overcome the existing in prior technology problem, can precisely actv. work in rigorous environment.
In addition, the present invention also provides the error correction scheme to this position fixing system and localization method thereof, has further improved the detection accuracy rate of this train positioning system, satisfies current track traffic development to requirements at the higher level that checking system proposed.
Description of drawings
Fig. 1 is the system construction drawing based on the high precision train positioning system of radio-frequency technique;
Fig. 2 is the system construction drawing that has the high precision train positioning system of error correction systems;
Fig. 3 is the first example structure figure of high precision train positioning system;
Fig. 4 is the second example structure figure of high precision train positioning system;
Fig. 5 is the 3rd example structure figure of high precision train positioning system;
Fig. 6 is the diagram of circuit based on the high precision train locating method of radio-frequency technique;
Fig. 7 is the diagram of circuit with high precision train locating method of error correction.
The specific embodiment
Below in conjunction with drawings and Examples the present invention is further described.
In view of all there are various problems in the mileage location technology that has various track inspection cars now noted earlier, can't fully satisfy the needs that actual track train mileage detects.The present invention designs a kind of high precision train Positioning Technology that realizes based on RFID (Radio Frequency Identification) REID.
The RFID REID is a kind of contactless automatic identification technology, and it is by the automatic recognition objective object of radiofrequency signal and obtain related data, and identification work need not manual intervention.The RFID technology have can hold long than multicapacity, communication distance, be difficult to duplicate, environmental change had higher suffertibility, can read advantage such as a plurality of labels simultaneously, be fit to be applied to the mileage location work of railcar, can overcome aforementioned problems of the prior art.
Fig. 1 is the system construction drawing based on the high precision train positioning system of radio-frequency technique.Should as shown in Figure 1, comprise based on the high precision train positioning system of radio-frequency technique: the some radio-frequency cards on the fixture in orbit are set, are arranged at least one reader and process computer on the railcar.
Described radio-frequency card is used to respond transmitting that reader sends, and returns reflected signal.At least the card number that includes this radio-frequency card in the described reflected signal, each radio-frequency card all have a unique card number.
Described reader is advanced jointly with railcar, is used to send transmit; Reception is also handled the reflected signal that radio-frequency card returns, and obtains the card number of this detected radio-frequency card; The detected radio-frequency card card number that is obtained is sent to process computer.The corresponding setting with radio-frequency card of this reader, usually in order to obtain the longer Card Reader time, the level height of reader and radio-frequency card should be identical.This reader comprises: antenna, codec and output interface.
Described antenna is used to send and transmits, and the reflected signal that returns of received RF card.
Described codec is used for described reflected signal is carried out demodulating and decoding, obtains the card number of this detected radio-frequency card.
Described output interface is connected with process computer, and the detected radio-frequency card card number that is used for being obtained sends to process computer.
Described process computer links to each other with reader, is used to call identification of radio-frequency card data bank and the corresponding locating information of detected radio-frequency card card number.This radio-frequency card data bank stores the locating information of each radio-frequency card.The locating information of this radio-frequency card is corresponding one by one with the radio-frequency card card number.
Preferably, this reader can also be provided with the card number detector.This card number detector is arranged between codec and the output interface, is used for the radio-frequency card card number that is obtained is detected the invalid card number of filtering.Like this, can carry out the preliminary election screening, filter out invalid card number the radio-frequency card card number.
Certainly, this card number detector also can be arranged in the process computer, the input end of this radio-frequency card data bank.It is same as described above to work, and just no longer repeats at this.
By the high precision train positioning system based on radio-frequency technique of said structure, reader outwards transmits along with railcar moves along track.In the time of near railcar moves to radio-frequency card, radio-frequency card enters in the Card Reader field of reader, and reflected signal is returned in transmitting that the response reader sends.The reflected signal that reader received RF card sends carries out demodulating and decoding to reflected signal, obtains the radio-frequency card card number and its validity is judged, the actv. card number is sent to process computer.Process computer is compared the radio-frequency card locating information that prestores in the card number that obtains and the radio-frequency card data bank, identifies the cooresponding locating information of card number.Like this, by above-mentioned position fixing system, we just can carry out real-time mileage position monitor based on REID to the railcar of advancing by default radio-frequency card in orbit.
In addition, go out the cooresponding locating information of this radio-frequency card card number to process computer to handling computer Recognition, need certain transmission and processing time owing to send the radio-frequency card card number that obtains from reader.Bring certain error may for during this period of time the mileage location of train.Therefore, the applicant also designs in this high precision train positioning system error correction systems.
Fig. 2 is the system construction drawing that has the high precision train positioning system of error correction systems.As shown in Figure 2, this error correction systems comprises: photoelectric encoder, accurate counter, Error Calculator and error correction unit.
Described photoelectric encoder is installed on the wheel shaft of railcar, along with the rotation generation impulse singla of railcar wheel shaft.
Described accurate counter links to each other with photoelectric encoder, is used to receive the impulse singla of photoelectric encoder; Receive the actuation signal that reader sends, start counting the photoelectric encoder impulse singla; Receive the termination signal that process computer sends, stop counting the photoelectric encoder impulse singla; The photoelectric encoder pulse count signal value that obtains is sent to Error Calculator.
Here, reader is to send actuation signal to accurate counter when process computer sends the radio-frequency card card number, and process computer is to send termination signal to accurate counter when identifying the corresponding locating information of radio-frequency card card number.Like this, described photoelectric encoder pulse count signal value promptly is to have write down the pulse number that photoelectric encoder produced in the time-delay period that native system causes because of transmission process.
Described Error Calculator is used for according to photoelectric encoder pulse count signal value calculation error distance, and error distance is sent to the error correction unit as the error correction values of this detected radio-frequency card locating information.Here, because photoelectric encoder and railcar wheel shaft connect firmly, wheel shaft rotates the impulse singla of all photoelectric encoder output fixed qties, and wheel circumference is known, and then the distance of each photoelectric encoder pulse representative is as can be known.Therefore, Error Calculator can calculate error distance according to the pulse count signal of photoelectric encoder.
Described error correction unit is used for according to the error correction values that receives detected radio-frequency card locating information being revised.
As seen, can revise because of the caused delay time error of signal processing time system, further improve the accuracy rate of this train positioning system, satisfy current track traffic development requirements at the higher level that checking system proposed by above-mentioned error correction systems.
Because of the caused error of system signal processing time, the position that also may install because of reader in this system and the reading range of reader are introduced error except above-mentioned.
The caused error in reader installation site, be because the train mileage locating information of the final acquisition of institute of train positioning of the present invention system only is a group in the multi-group data that detects as railcar, need be used with other data in the whole train detection systems.Therefore, train positioning system ultimate demand is pooled to train mileage locating information in the train detection systems of railcar.And may there be certain space length in train detection systems position and reader position, can give train detection systems drawing-in system error thus, so we need revise to this part distance error.
The error that the reading range of reader is introduced is because information interaction needs certain Card Reader time between reader and the radio-frequency card, this will guarantee radio-frequency card will be in the reading range of reader a period of time.Because railcar is in traveling process, therefore between reader and radio-frequency card, need to guarantee enough reading ranges, need us to revise and also can introduce certain error by this reading range.Because the reading range between reader and the radio-frequency card is to be determined by waveform and spacing between the two that reader transmits, so this error amount should be the definite value that we can know in advance.
Therefore the position that reader is installed and the error that reading range is introduced of reader all are the definite values that can know in advance.Therefore, the present invention has designed following structure it has been revised, and as shown in Figure 2, also is provided with installation site correction memory cell and reading range correction memory cell in this error correction systems.
Described installation site correction memory cell is used to store the installation site correction;
Described reading range correction memory cell is used to store the reading range correction;
Described Error Calculator is used for reading installation site correction and reading range correction that described installation site correction memory cell and reading range correction memory cell are stored; According to the described error distance that calculates and described installation site correction and reading range correction, calculate error correction values, and this error correction values is sent to the error correction unit this radio-frequency card locating information.
In the native system, reader and radio-frequency card on railcar and track other the position specifically is set, because of the situation of railcar is different with the surrounding environment factor, the multiple different plan of establishment can be arranged also.Here, we just by following several embodiment, provide several feasible plans of establishment.
Embodiment one:
As shown in Figure 3, in the high precision train positioning system based on radio-frequency technique of present embodiment, described radio-frequency card is installed on the electric pole of track side.Include two readers in this train positioning system, be installed on the both sides in the railcar compartment respectively, corresponding with radio-frequency card.Described two readers all are connected with process computer.
Here, why two readers will be set, mainly be after considering the railcar rotary head, and one-sided reader can't satisfy the needs that continue detection, and therefore being provided with needs the opposite side reader, detects so that proceed.
Preferably, described reader is close to the railcar vehicle window, to strengthen the communication signal between reader and the radio-frequency card.
This embodiment is applicable to that mainly some railcar running velocitys are higher, and car body is lower, need keep the situation of a determining deviation between radio-frequency card and reader.
Embodiment two:
As shown in Figure 4, in the high precision train positioning system based on radio-frequency technique of present embodiment, described radio-frequency card is installed on the mile stone of track side.Include two readers in this train positioning system, be installed on the both sides outside the railcar compartment respectively, corresponding with radio-frequency card.Described two readers all are connected with process computer.
Embodiment three:
As shown in Figure 5, in the high precision train positioning system based on radio-frequency technique of present embodiment, described radio-frequency card is installed in the track bottom side.The reader correspondence of this train positioning system is installed in the bottom side of railcar.Described reader is connected with process computer.
This embodiment is applicable to that mainly some railcar running velocitys are relatively low, and is perhaps higher at the bottom of the railcar, and railcar bottom side and track space enough guarantee to keep between radio-frequency card and the reader situation of certain reading range.
Among above-mentioned each embodiment, reader can be set in the compartment, outside the compartment or bottom side, compartment.According to the position difference that reader is provided with, its with process computer between communicate to connect also and can take different modes, specifically can be connected by RS-232, RS-485 or Ethernet interface.
Based on the high precision train positioning system of said structure, the present invention also designs the high precision train locating method based on radio-frequency technique, and as shown in Figure 6, this localization method comprises:
Step 601 is provided with transmitting that radio-frequency card response reader on the fixture in orbit sends, and returns reflected signal; At least the card number that includes this radio-frequency card in the described reflected signal;
Step 602 is arranged on the reflected signal that reader receives and the processing radio-frequency card returns on the railcar, obtains the card number of this detected radio-frequency card;
Preferably, after described reader obtains detected radio-frequency card card number, also the detected radio-frequency card card number that is obtained is detected the invalid card number of filtering by the card number detector.
As previously mentioned, in this high precision train positioning system, also because of the caused delay time error design of signal processing time error correction systems is arranged at system.Based on this error correction systems, the present invention also designs the error correcting method of high precision train positioning, and as shown in Figure 7, this error correcting method also comprises on the basis of aforementioned localization method:
Step 704, reader also sends actuation signal to accurate counter when sending the radio-frequency card card number to process computer;
Step 705, process computer also send termination signal to accurate counter when identifying the corresponding locating information of radio-frequency card card number;
Step 706, accurate counter receives actuation signal, starts the counting to the photoelectric encoder impulse singla; Receive termination signal, stop counting the photoelectric encoder impulse singla;
Step 707, Error Calculator be according to photoelectric encoder pulse count signal value calculation error distance, and with the error correction values of this error distance as this detected radio-frequency card locating information;
Step 708, the error correction unit is revised radio frequency fastening position information according to this error correction values.
As previously mentioned, the present invention has above-mentioned because of the caused error correction of system signal processing time except design, also the method revised of the design error that has the reading range of position that pair reader installs and reader to introduce.As shown in Figure 7, described error correcting method also comprises:
Step 709, Error Calculator read the installation site correction of installation site correction cell stores;
Step 710, Error Calculator read the reading range correction of reading range correction cell stores;
Step 707, Error Calculator are calculated the error correction values to this radio-frequency card locating information according to the error distance and installation site correction that reads and the reading range correction that calculate.
In sum, the present invention is based on radio-frequency technique and designed a kind of brand new high precision train positioning system and localization method thereof.This train positioning system and localization method have been inherited radio-frequency technique and can have been held than multicapacity, communication distance length, environmental change is had higher plurality of advantages such as suffertibility owing to adopted REID, have overcome the existing in prior technology problem.And the present invention also provides the error correction scheme to this position fixing system and localization method thereof, has further improved the accuracy rate of this train positioning system, satisfies current track traffic development to requirements at the higher level that checking system proposed.Persons skilled in the art are done any not creative transformation to technical scheme of the present invention under this design philosophy, all should be considered as within protection scope of the present invention.
Claims (10)
1. the high precision train positioning system based on radio-frequency technique is characterized in that, comprising: the plurality of radio card on the fixture in orbit is set, is arranged at least one reader and process computer on the railcar;
Described radio-frequency card is used to respond transmitting that reader sends, and returns reflected signal; At least the card number that includes this radio-frequency card in the described reflected signal;
Described reader is used to send and transmits; Reception is also handled the reflected signal that radio-frequency card returns, and obtains the card number of this detected radio-frequency card; The detected radio-frequency card card number that is obtained is sent to process computer;
Described process computer links to each other with reader, is used to call identification of radio-frequency card data bank and the corresponding locating information of this detected radio-frequency card card number; Store in the described radio-frequency card data bank and each radio-frequency card card number corresponding radio frequency fastening position information.
2. a kind of high precision train positioning system based on radio-frequency technique as claimed in claim 1 is characterized in that, also is provided with error correction systems in the described train positioning system; This error correction systems comprises: photoelectric encoder, accurate counter, Error Calculator and error correction unit;
Described photoelectric encoder is installed on the wheel shaft of railcar, along with the rotation generation impulse singla of railcar wheel shaft;
Described accurate counter links to each other with photoelectric encoder, is used to receive the impulse singla of photoelectric encoder; Receive the actuation signal that reader sends, start counting the photoelectric encoder impulse singla; Receive the termination signal that process computer sends, stop counting the photoelectric encoder impulse singla; The photoelectric encoder pulse count signal value that obtains is sent to Error Calculator;
Described Error Calculator is used for according to this photoelectric encoder pulse count signal value calculation error distance, and error distance is sent to the error correction unit as the error correction values of this detected radio-frequency card locating information;
Described error correction unit is used for according to the error correction values that receives this detected radio-frequency card locating information being revised.
3. a kind of high precision train positioning system based on radio-frequency technique as claimed in claim 2 is characterized in that, also is provided with installation site correction memory cell and reading range correction memory cell in described error correction systems;
Described installation site correction memory cell is used to store the installation site correction;
Described reading range correction memory cell is used to store the reading range correction;
Described Error Calculator is used for reading installation site correction and reading range correction that described installation site correction memory cell and reading range correction memory cell are stored; According to the described error distance that calculates and described installation site correction and reading range correction, calculate error correction values, and this error correction values is sent to the error correction unit this radio-frequency card locating information.
4. a kind of high precision train positioning system based on radio-frequency technique as claimed in claim 1 is characterized in that described radio-frequency card is installed on the fixture of track side; Be provided with two readers in this train positioning system, be installed on the both sides of railcar respectively, corresponding with radio-frequency card; Described two readers are arranged on the inboard, compartment or the outside of railcar; Described two readers all are connected with described process computer.
5. a kind of high precision train positioning system based on radio-frequency technique as claimed in claim 4 is characterized in that described reader is arranged in the compartment of railcar, is close to the railcar vehicle window.
6. the high precision train positioning system based on radio-frequency technique as claimed in claim 1 is characterized in that described radio-frequency card is installed in the track bottom side; Described reader correspondence is installed in the bottom side of railcar.
7. a kind of high precision train positioning system based on radio-frequency technique as claimed in claim 1 is characterized in that, is connected by RS-232, RS-485 or Ethernet interface between described reader and the process computer.
8. the high precision train locating method based on radio-frequency technique is characterized in that, comprising:
Transmitting that radio-frequency card response reader on the fixture in orbit sends is set, returns reflected signal; At least the card number that includes this radio-frequency card in the described reflected signal;
Be arranged on the reflected signal that reader receives and the processing radio-frequency card returns on the railcar, obtain the card number of this detected radio-frequency card; And the radio-frequency card card number that is obtained sent to process computer;
Process computer calls the radio-frequency card data bank, identification and the corresponding locating information of this detected radio-frequency card card number.
9. a kind of high precision train locating method based on radio-frequency technique as claimed in claim 8 is characterized in that, also comprises:
Reader also sends actuation signal to accurate counter when sending the radio-frequency card card number to process computer;
Process computer also sends termination signal to accurate counter when identifying the corresponding locating information of detected radio-frequency card card number;
Accurate counter receives actuation signal, starts the counting to the photoelectric encoder impulse singla; Receive termination signal, stop counting the photoelectric encoder impulse singla;
Error Calculator is according to photoelectric encoder pulse count signal value calculation error distance, and with the error correction values of this error distance as this detected radio-frequency card locating information;
The error correction unit is revised radio frequency fastening position information according to this error correction values.
10. a kind of high precision train locating method based on radio-frequency technique as claimed in claim 9 is characterized in that, also comprises:
Error Calculator reads the installation site correction of installation site correction cell stores;
Error Calculator reads the reading range correction of reading range correction cell stores;
Error Calculator is calculated the error correction values to this radio-frequency card locating information according to the error distance and installation site correction that reads and the reading range correction that calculate.
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