CN102883272A - RFID technology-based displacement sensing positioning system and positioning method thereof - Google Patents
RFID technology-based displacement sensing positioning system and positioning method thereof Download PDFInfo
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Abstract
The invention discloses an RFID (Radio Frequency Identification Device) technology-based displacement sensing positioning system and a positioning method thereof. The system comprises a plurality of positioning communication units, wherein each positioning communication unit is composed of two base stations and a certain length of leakage cable with two ends connected with the two base stations; the base stations on the two ends of the leakage cable send signals with time marks to a mobile station, and the mobile station in any position between the two base stations monitors and receives the signals sent by the two base stations, and the accurate position of the mobile station between the two base stations can be analyzed and calculated out according to the signal sending time of the two base stations and the signal arrival time, as well as the known speed and distance of the signal sending between the mobile station and the two base stations through the leakage cable, thereby completing the displacement sensing positioning communication. According to the invention, the displacement sensing positioning communication of the mobile station in a laneway is realized, and the installation and debugging of positioning card readers, substations and the like which are used in a traditional positioning communications system are avoided, thereby simplifying the system, reducing installation workload and maintenance workload in a later period, and improving the stability and performance of the system. Therefore, whole-journey continuous accurate positioning communication is realized in the system coverage.
Description
Technical field
The present invention relates to communication technique field, be specifically related to a kind of roadway location communication system and localization method thereof based on leaky cable radio frequency transmission technology.
Background technology
At present, traditional roadway location communication system technology overwhelming majority adopts at the location circuit arranges several anchor points, at each anchor point the orientation and communication radio-frequency card reader is installed, each orientation and communication card reader has different identity codes, and with its near the mutual communication of mobile radio station.After near mobile radio station moves to the anchor point card reader, according to the mutual identification of card reader and mobile radio station, determine identity and the positional information of mobile radio station, realize the orientation and communication of mobile radio station.This traditional displacement sensing navigation system, need to be at a large amount of locating card readers of locating area installation along the line, each card reader is to be made of the integrated circuit of complexity and radio frequency chip, and connect by cable, card reader Installation and Debugging workload is large, and the maintenance workload in later stage is large, and system failure rate is high, poor stability, and the low precision of location, the effective location zone is that each card reader is with the blocks of discontinuous block of central point to radiation all around.
Summary of the invention
For above-mentioned problems of the prior art, the object of the present invention is to provide a kind of positioning communication system based on the leakage cable transmission technology, under the environment of tunnel, need not to install in a large number the orientation and communication card reader, simple in structure, the stability of a system is strong, and the positioning communication system based on the leakage cable transmission technology of the energy continuous orientation and communication of non-blind area along the line
The present invention has adopted following technical scheme for achieving the above object: a kind of roadway location communication system based on leaky cable radio frequency transmission technology, by host computer and with some orientation and communication cell formations of host computer connecting communication, described orientation and communication unit comprise one section along the tunnel leaky cable that lay and that length is known and be connected to two base stations at leaky cable two ends; Data processing module and radio-frequency communication module are set in the described base station, and the radio-frequency communication module of base station connects and by the radiofrequency signal of leaky cable transmitting-receiving with clock, mobile radio station moves along leaky cable, by leakage cable transmission radiofrequency signal and base station communication.
Clock mark when being connected to radiofrequency signal that two base stations at described leaky cable two ends send with this base station identity mark and transmitted signal; Mobile radio station is in arbitrary position along the line, receive the two ends base station signal, by analyzing the clock mark of two base station signal tranmitting data register marks and arrival mobile radio station, and according to electromagnetic signal transmission speed on the radio-frequency leakage cable and the known conditions by the leakage cable transmission distance, the position of mobile radio station self is determined in analytical calculation, and positional information is issued to by leaky cable transfers to base station and system, finish orientation and communication.
The invention also discloses a kind of localization method of the roadway location communication system based on leaky cable radio frequency transmission technology, comprise the steps:
(1) length of the leaky cable L that lays in the setting tunnel is 1, and the leaky cable two ends connect respectively base station A and base station B, and mobile radio station is Y.Mobile radio station Y moves along leaky cable, and arbitrary position between two base stations can both receive the signal that base station A and base station B send by leaky cable L, the clock mark when signal comprises identification of base stations mark and signal and sends.
(2) setting of station clock mark:
When station clock is the our station receiving and transmitting signal according to the clock mark of our station clock log.When sending signal from base station A, it is Ta that base station A sends clock mark; Signal arrives mobile radio station Y, and it is T (y1) that mobile radio station Y arrives clock mark; When sending signal from base station B, it is Tb that base station B sends clock mark, and base station B signal arrives mobile radio station Y, and it is T(y2 that mobile radio station Y arrives clock mark).
(3) setting of standard time clock mark:
Because individual difference has the synchronised clock error between the station clock at each station.If take the station clock Ta of base station A as standard time clock, each station is during with A clock Ta school, base station.The synchronised clock error of base station B and standard time clock is made as T (BW), and the synchronised clock error of mobile radio station Y and standard time clock is made as T (YW).For making each station clock synchronous, standard time clock is adopted at each station, orientation and communication unit, and each station is revised take base station A clock Ta as synchronization criterion.Base station B standard time clock is labeled as Tbb, Tbb=Tb-T (BW), and namely the standard time clock of base station B is the synchronous error T (BW) that the station clock of base station B deducts base station B and standard time clock.The standard time clock of mobile radio station Y is labeled as Tby, Tby=Ty-T (YW), and namely the standard time clock of mobile radio station Y is the synchronous error T (YW) that the station clock of mobile radio station Y deducts mobile radio station Y and standard time clock.
(4) when base station A, B school, base station.
Because individual timing differential, base station A, B clock have synchronous error, and along with the passage of time error is increasing.For making A, B keep clock synchronous, when the orientation and communication unit just needs the school at set intervals once.Base station B and A school, base station constantly, base station B sends the signal with clock mark to base station A, known according to leaky cable length l between A, the base station B, electromagnetic signal transmission speed c is that 300000km/s is known, B is to the signal transmission time T0=l/c of A.If the station clock that base station B signal sends is Tb, station clock was Ta when base station A received signal.Time difference T1=Ta-Tb between two station clock.Such as base station B clock and A clock synchronous, Ta-Tb=T1=T0.Such as base station B clock Tb and Ta synchronous error T (BW) is arranged, T1 ≠ T0 then, T (BW)=T0-T1.Known according to condition Ta, Tb, l, c, T (BW) can be tried to achieve by the station data processing module constantly in each school.
(5) the orientation and communication unit station clock of respectively standing is modified to standard time clock, makes clock synchronous.
Mobile radio station Y moves between A, base station B any point on the leaky cable circuit, can both receive the signal with clock mark that A base station, base station B sends respectively.For making all station clocks synchronous, all station clocks are all take base station A clock Ta as standard correction synchronous error.If there are synchronous error T(YW in the station clock Ty of mobile radio station Y and standard time clock), Y standard time clock Tby=Ty-T (YW).Mobile radio station Y receives the base station a-signal, and base station a-signal tranmitting data register is Ta, and the destination clock that arrives mobile radio station Y is T (y1), arrives standard time clock Tby1=(Ty1-TYW).Mobile radio station Y receives the signal of base station B, and the dispatching station clock is Tb, transmission standard time clock Tbb=(Tb-TBW); The station clock that arrives mobile radio station Y is Ty2, arrival standard time clock Tby2=(Ty2-TYW).
(6) according to Given information, derive the positional information of mobile radio station Y.
If base station A is Tay to electromagnetic signal running time of mobile radio station Y, Tay is that the base station a-signal sends standard time clock and mobile radio station Y and receives time difference between the standard time clock.Be Tay=Ta-(Ty1-TYW); If base station B is Tby to electromagnetic signal running time of mobile radio station Y, Tby is that base station B signal sends standard time clock and mobile radio station Y and receives time difference between the standard time clock.Be Tby=Tbb-(Ty2-TYW).
The base station a-signal arrives the time T ay of mobile radio station Y operation and difference and the sum of the time T by that base station B signal arrival mobile radio station Y moves can obtain equation group, and obtains the value of Tay and Tby by Given information.Tay-Tby=[Ta-(Ty1-TYW)]-[Tbb-(Ty2-TYW)]=Ta-Ty1+TYW-Tbb+Ty2-TYW=（Ta-Ty1）-（Tbb-Ty2）。Derive Tay-Tby=(Ta-Ty1)-(Tbb-Ty2).Offset the station clock error T(YW of mobile radio station Y in this derivation), so unknown quantity T(YW) can not ask.Mobile radio station Y is on the leaky cable between two base station A, the B is along the line again, and leaky cable length is l, and Tay, Tby are that A, base station B divide the electromagnetic signal that is clipped to mobile radio station Y running time, and c is known electric magnetic signal transmission speed; Then there is Tay*c+Tby*c=l to set up, Tay+Tby=l/c is namely arranged.
With Tay-Tby=(Ta-Ty1)-(Tbb-Ty2) classify equation group as with Tay+Tby=l/c.According to the equation group solution, two formula equal sign both sides additions solve 2Tay=(Ta-Ty1)-(Tbb-Ty2)+l/c, solve Tay=[(Ta-Ty1)-(Tbb-Ty2)+l/c]/2.Mobile radio station Y location positioning is the position apart from base station A Tay*c.
As shown from the above technical solution, the present invention utilizes one section known length leaky cable and two base stations that link to each other with its two ends, data processing module and radio-frequency communication module are set in base station, two ends and the mobile radio station, and the radio-frequency communication module of base station connects and receives and dispatches radiofrequency signal by leaky cable; Mobile radio station moves along leaky cable, mobile radio station is by the leaky cable on the mobile route and base station communication, the radiofrequency signal that the base station sends is with the clock mark of this base station identity mark and transmitted signal, this signal is intercepted and received to mobile radio station, by analyzing two base station signal tranmitting data register marks and arriving clock mark, and by signal between two base stations by known conditions such as leakage cable transmission distance and transmission speeds, analysis meter is calculated the accurate location of mobile radio station between two base stations, finish the displacement sensing location, and positional information is sent base station and the system of transferring to by leaky cable.
Beneficial effect of the present invention:Utilize two base stations of orientation and communication unit and one section known length leaky cable that two ends are attached thereto in the tunnel, to realize the displacement sensing orientation and communication of mobile radio station, a large amount of installations of using locating card reader in traditional positioning communication system have been exempted, simplified system, installation workload and later maintenance workload have been reduced, and improved Systems balanth and performance, realize omnidistance continuity orientation and communication in the coverage.
Description of drawings
The present invention is described in more detail below in conjunction with the drawings and specific embodiments.
Fig. 1 is the orientation and communication cellular construction schematic diagram among the present invention;
Fig. 2 is system configuration schematic diagram of the present invention.
Embodiment
As shown in Figure 1, orientation and communication of the present invention unit comprise one section along the tunnel leaky cable L24 that lay and that length is known and be connected to base station A21 and the base station B22 at leaky cable two ends; Base station A data processing module 211 and base station A radio-frequency communication module 212 are set in the A21 of base station, base station B data processing module 221 and base station B radio-frequency communication module 222 are set in the B22 of base station, the radio-frequency communication module of two base stations connects and by the radiofrequency signal of leaky cable L24 transmitting-receiving with clock, mobile radio station Y25 moves along the leaky cable 24 that is laid in the tunnel, both do not contact, but its can by leaky cable L transmitting-receiving radiofrequency signal and with base station A, B communication.To the signal of leaky cable L transmission with this base station identity mark and tranmitting data register mark, mobile radio station Y can receive respectively the signal that base station A, B send by leaky cable L in arbitrary position along the line to the base station, two ends respectively.Mobile radio station Y carries out communication by leaky cable L and base station A, B, and obtains relevant clock information, obtains the positional information of mobile radio station Y by computing, and by communication cable positional information is sent to system and host computer, completing place sensing location.
Mobile radio station Y intercepts and receives the signal that sends respectively from base station A, B in leaky cable L arbitrary position along the line by leaky cable L.A-signal dispatching station clock mark in base station is Ta, and the destination clock mark that signal reaches mobile radio station Y is Ty1; B signal dispatching station clock mark in base station is Tb, and the station clock that mobile radio station Y receives this signal is labeled as Ty2.If take the station clock Ta of base station A as standard time clock, each station is during with A clock Ta school, base station, and the synchronous error of base station B and standard time clock is T (BW), and the synchronous error of mobile radio station Y and standard time clock is T (YW).For making each station clock synchronous, each station is take the base station A clock Ta standard time clock synchronous as standard time clock is modified to.Base station B standard time clock is designated as Tbb, Tbb=Tb-T (BW).The standard time clock of mobile radio station Y is labeled as Tby, Tby=Ty-T (BY).
Mobile radio station Y moves between A, the B any point on the leaky cable circuit, can both receive the signal with clock mark that A base station, base station B sends respectively.According to above-mentioned localization method, when base station A and base station B carry out the school at set intervals, obtain synchronous error T (BW) value of base station B and standard time clock.Mobile radio station Y and the unknown of standard time clock error T (YW) value can not asked.If base station A is Tay to electromagnetic signal running time of mobile radio station Y, base station B to electromagnetic signal running time of mobile radio station Y be Tby.
The built-in data processing module of mobile radio station Y receives the tranmitting data register of signal and arrives clock Ta, Ty1, Tb, Ty2 value by base station A, base station B transmitted signal and mobile radio station Y, and T (BW) value that draws when base station A, B school, base station, the formula Tay=[(Ta-Ty1 that the data processing module of mobile radio station is derived according to the localization method that the present invention relates to)-(Tbb-Ty2)+l/c]/2, the mobile radio station data processing module calculates the value of Tay, and the position of determining mobile radio station Y is apart from the position of station A apart from Tay*c between A, the B.After mobile radio station calculates self-position, positional information is crossed radiofrequency signal with the station information exchange be sent to base station and host computer by leaky cable, finish the orientation and communication of station Y.
The present invention is by the positional information of the clock information calculating mobile radio station Y of signal transmitting and receiving, and computing can be at the mobile radio station data processing module, also can make the data processing module of base station, also can make host computer.
Figure 2 shows that system configuration schematic diagram of the present invention, this system forms by host computer 1 with first, second, and third orientation and communication unit of host computer connecting communication, and the quantity of orientation and communication unit is decided on designing requirement, and is the amount doesn't matter.Wherein: the first orientation and communication unit is laid connection two stations and the known leaky cable L1 of length by base station A1, base station B1, mobile radio station Y1 and the section of and is consisted of along the tunnel; The second orientation and communication unit is laid connection two stations and the known leaky cable L2 of length by base station A2, base station B2, mobile radio station Y2 and the section of and is consisted of along the tunnel; The 3rd orientation and communication unit is laid connection two stations and the known leaky cable L3 of length by base station A3, base station B3, mobile radio station Y3 and the section of and is consisted of along the tunnel.Adopt communication cable to be connected between host computer and the some orientation and communications unit and communicate with one another.Above-mentioned in addition is the canonical form of location, and actual can have a lot of mobile radio station Y in a positioning unit, also can not have mobile radio station.The present invention utilizes two base stations and one section leaky cable of each orientation and communication unit of system, realize the displacement sensing orientation and communication of mobile radio station in the tunnel, a large amount of installation, debugging of using the large number quipments such as locating card reader and substation in traditional positioning communication system have been exempted, simplified system, installation workload and later maintenance workload have been reduced, and improved Systems balanth and performance, realize the accurate orientation and communication of omnidistance continuity in the system ovelay range.
Above-mentioned only is embodiments of the invention, and to one skilled in the art, the present invention has multiple change and variation.Allly within invention thought of the present invention and principle, make any modification, be equal to replacement, improve etc., all should be included within protection scope of the present invention.
Claims (3)
1. roadway location communication system based on leaky cable radio frequency transmission technology, it is characterized in that: this system by host computer and with some orientation and communication cell formations of host computer connecting communication, described orientation and communication unit comprise one section along the tunnel leaky cable that lay and that length is known and be connected to two base stations at leaky cable two ends; Data processing module and radio-frequency communication module are set in the described base station, and the radio-frequency communication module of base station connects and by the radiofrequency signal of leaky cable transmitting-receiving with clock, mobile radio station moves along leaky cable, by leakage cable transmission radiofrequency signal and base station communication.
2. the roadway location communication system based on leaky cable radio frequency transmission technology according to claim 1 is characterized in that: the clock mark when being connected to radiofrequency signal that two base stations at described leaky cable two ends send with this base station identity mark and transmitted signal; Mobile radio station is in arbitrary position along the line, receive the two ends base station signal, by analyzing the clock mark of two base station signal tranmitting data register marks and arrival mobile radio station, and according to electromagnetic signal transmission speed on the radio-frequency leakage cable and the known conditions by the leakage cable transmission distance, the position of mobile radio station self is determined in analytical calculation, and positional information is issued to by leaky cable transfers to base station and system, finish orientation and communication.
3. realize the localization method of claim 1 or 2 described roadway location communication systems based on leaky cable radio frequency transmission technology, it is characterized in that: comprise the steps:
(1) length of the leaky cable L that lays in the setting tunnel is 1, and the leaky cable two ends connect respectively base station A and base station B, and mobile radio station is Y; Mobile radio station Y moves along leaky cable, and arbitrary position can both receive the signal that base station A and base station B send by leaky cable L between two base stations, the clock mark when this signal comprises identification of base stations mark and signal and sends;
(2) setting of station clock mark:
Clock mark according to the base station clock record during base station transceiver signal is called station clock; Set: when sending signal from base station A, it is Ta that base station A sends clock mark; Signal arrives mobile radio station Y, and it is T (y1) that mobile radio station Y arrives clock mark; When sending signal from base station B, it is Tb that base station B sends clock mark, and base station B signal arrives mobile radio station Y, and it is T(y2 that mobile radio station Y arrives clock mark);
(3) setting of standard time clock mark:
Set: take the station clock Ta of base station A as standard time clock, each station is during with A clock Ta school, base station; The synchronised clock error of base station B and standard time clock is made as T (BW), and the synchronised clock error of mobile radio station Y and standard time clock is made as T (YW); For making each station clock synchronous, standard time clock is adopted at each station, orientation and communication unit, and each station is revised take base station A clock Ta as synchronization criterion; Base station B standard time clock is labeled as Tbb, Tbb=Tb-T (BW), and namely the standard time clock of base station B is the synchronous error T (BW) that the station clock of base station B deducts base station B and standard time clock; The standard time clock of mobile radio station Y is labeled as Tby, Tby=Ty-T (YW), and namely the standard time clock of mobile radio station Y is the synchronous error T (YW) that the station clock of mobile radio station Y deducts mobile radio station Y and standard time clock;
(4) when base station A and B school, base station:
Base station B sends the signal with clock mark to base station A, and known according to leaky cable length l between base station A, the base station B, electromagnetic signal transmission speed c is that 300000Km/s is known, and base station B is to the signal transmission time T0=l/c of base station A; If the station clock that base station B signal sends is Tb, station clock was Ta when base station A received signal; Time difference T1=Ta-Tb between two station clock; Such as base station B clock and base station A clock synchronous, Ta-Tb=T1=T0; Such as base station B clock Tb and Ta synchronous error T (BW) is arranged, T1 ≠ T0 then, T (BW)=T0-T1; Known according to condition Ta, Tb, l, c, T (BW) can be tried to achieve by the station data processing module constantly in each school;
(5) the orientation and communication unit station clock of respectively standing is modified to standard time clock, makes clock synchronous:
All station clocks are all take base station A clock Ta as standard correction synchronous error; If there are synchronous error T(YW in the station clock Ty of mobile radio station Y and standard time clock), Y standard time clock Tby=Ty-T (YW); Mobile radio station Y receives the base station a-signal, and base station a-signal tranmitting data register is Ta, and the destination clock that arrives mobile radio station Y is T (y1), arrives standard time clock Tby1=(Ty1-TYW); Mobile radio station Y receives the signal of base station B, and the dispatching station clock is Tb, transmission standard time clock Tbb=(Tb-TBW); The station clock that arrives mobile radio station Y is Ty2, arrival standard time clock Tby2=(Ty2-TYW);
(6) according to Given information, derive the positional information of mobile radio station Y:
If base station A is Tay to electromagnetic signal running time of mobile radio station Y, Tay is that the base station a-signal sends standard time clock and mobile radio station Y and receives time difference between the standard time clock, i.e. Tay=Ta-(Ty1-TYW); If base station B is Tby to electromagnetic signal running time of mobile radio station Y, Tby is that base station B signal sends standard time clock and mobile radio station Y and receives time difference between the standard time clock, i.e. Tby=Tbb-(Ty2-TYW);
The base station a-signal arrives the time T ay of mobile radio station Y operation and difference and the sum of the time T by that base station B signal arrival mobile radio station Y moves can obtain equation group, and obtains the value of Tay and Tby: Tay-Tby=[Ta-(Ty1-TYW) by Given information]-[Tbb-(Ty2-TYW)]=Ta-Ty1+TYW-Tbb+Ty2-TYW=(Ta-Ty1)-(Tbb-Ty2); : Tay-Tby=(Ta-Ty1)-(Tbb-Ty2);
Again: mobile radio station Y is on the leaky cable between base station A and the base station B is along the line, leaky cable length is l, and Tay, Tby are that base station A, base station B divide the electromagnetic signal that is clipped to mobile radio station Y running time, and c is known electric magnetic signal transmission speed, then there is Tay*c+Tby*c=l to set up, Tay+Tby=l/c is namely arranged;
With Tay-Tby=(Ta-Ty1)-(Tbb-Ty2) classify equation group as with Tay+Tby=l/c; Solve 2Tay=(Ta-Ty1)-(Tbb-Ty2)+l/c, solve Tay=[(Ta-Ty1)-(Tbb-Ty2)+l/c]/2; Thereby can determine the position of mobile radio station Y between base station A and base station B, namely the distance with base station A is Tay*c.
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