CN1159686C - Electronic traffic record system - Google Patents
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- CN1159686C CN1159686C CNB021393745A CN02139374A CN1159686C CN 1159686 C CN1159686 C CN 1159686C CN B021393745 A CNB021393745 A CN B021393745A CN 02139374 A CN02139374 A CN 02139374A CN 1159686 C CN1159686 C CN 1159686C
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Abstract
The present invention provides an electronic traffic single system. The electronic traffic single system of the present invention adopts a CDMA digital mobile communication technology and an opened information processing technology, collects and records vehicle running information in real time and transmits the vehicle running information to a superior general dispatching database for decision making. The system of the present invention comprises a base station controller, a station transmitting device and a vehicle mounted station, wherein the base station controller can be used for receiving an intraday vehicle running plane from a superior main control computer, processing road list information and introducing the road list information into the main control computer; the station transmitting device can be used for transmitting calling signals to vehicles; the vehicle mounted station can be used for recording, storing the road list information and transferring the road list information to the base station controller. A full duplex radio link is established between the base station controller and the vehicle mounted station, and the data exchange is carried out by a frame request and response mode; the transmission mode between the station transmitting device and the vehicle mounted station adopts a wireless unidirectional data transmission mode, and the station transmitting device sends station information to the vehicle mounted station. The bidirectional data exchange between the base station controller and the superior main control computer is carried out by a communication port, and the data communication between hardware is realized by software; the present invention can be used for an operation and management system of public vehicles.
Description
Technical field:
The present invention relates to radio digital communication and computer information processing, a kind of specifically electronic road form system that is used for the public transit vehicle operation management.
Background technology:
Along with the development of communication, to public transit vehicle carry out rationally, science, convenient, operation management accurately be the importance that urbanization is built.Current the whole nation each big city ubiquity various, the congested in traffic phenomenon of vehicle.Therefore press for a kind of intellectualized management system,, import the dispatching center into and in time the bus operation vehicle is implemented monitoring and scheduling so that collect, gather the operation information of public transit vehicle fast and accurately.Simultaneously, require this intellectualized management system to improve services such as security coordination monitoring and emergency relief by interface with external system, and on public transport station along the line, the real-time vehicle operation situation is provided and can reaches information such as vehicle to the passenger by electronic stop plate, help the passenger to select best trip, departure time and the mode of changing trains, to realize the intelligent management of bus dispatching.
The public transit vehicle operation management system that generally comes into operation at present mainly contains several big classes such as traditional artificial road single system, advanced GPS/GSM (GPS/global system for mobile communications) vehicle location dispatching and monitoring system and IC-card formula road single system.These several public transit vehicle operation management systems all mainly become part, system group network part, management software design part to constitute by the road simple form.Wherein, the road simple form becomes part to be responsible for collection, processing, storage and the transmission of car operation information; System group network is partly finished the seamless link of grid and existing network, promptly is used for the formation of information instantaneous transmission network; The management software part then is used for finishing the tasks such as remote transmission to information processing, statistics and data.Road simple form one-tenth part is a gordian technique in the whole public transport operation management system in these building blocks.Because, its content not only relates to running route, arrival time, departures time, the operation milimeter number of vehicle, steward's working strength, vehicle oil consumption, employee's attendance rate, vehicle service efficiency or the like, and be related to public transport company how thus information reasonably arrange the driving daily planning of every road public bus network, monthly plan, yearly plan real-time carries out vehicle scheduling, to reach the trip that has both made things convenient for people, improved the operational efficiency of vehicle again.Yet the road simple form of existing these several management systems becomes all existence deficiency and defectives separately of part.For example, traditional artificial road single system mainly depends on the road list of yardman's record, carries out artificial data analysis and statistics by the system manager, makes form, submits to the total activation of higher level company, makes a strategic decision with this.Major defect is that workload is big, real-time is poor, artificial property is strong.The utilization of GPS/GSM (GPS/global system for mobile communications) vehicle location dispatching and monitoring system be ripe GPS global satellite positioning, on speech, realized national roaming in conjunction with the GSM mobile communications network that China's telecommunications industry is opened in the whole nation, finish real-time monitoring to public transit vehicle, so function such as vehicle global location, the monitoring of quiet vehicle, responding rescue.The major defect of this system is that system stability is poor, operation and maintenance cost costliness.IC-card formula road single system has adopted the GPS technology equally, simultaneously by IC-card memory technology record traffic route, mileage, parking site, to/open the information such as time at station, and set up the comprehensive monitoring management scheduling system of vehicle on this basis.But this power system capacity is little, the failure rate height.
Summary of the invention:
The objective of the invention is to overcome the drawback of above-mentioned prior art, a kind of electronic road form system is provided, and the real-time control management method, to improve the applicability and the reliability of system, and the simplification hardware device, reduce operation and maintenance cost, finally realize the intelligent management of total system.
Realize that key problem in technology of the present invention is by adopting advanced CDMA (CDMA) digital mobile communication technology and open information treatment technology, information to running state of the vehicle is gathered and accurate recording in real time, and automatically each information of vehicles feed back to the scheduling and be sent in the database of higher level's total activation, make administrative authority can in time grasp the health information of public transit vehicle, thereby carry out science decision.Total system comprises base station controller, Vehicle mounted station, website transmitter.Wherein, base station controller, be used to receive driving plan on the same day from higher level's main control computer, and according to the time of this main control computer the time of this base station controller is imitated right, guarantee the single accuracy in time in road, and after the single information via information processing in the road that it write down, in time import this main control computer into; The website transmitter is used for public transit vehicle is sent call signal; Vehicle mounted station, be used to receive the call signal of this base station controller and the transmission of this website transmitter, and write down, store the single information in road in the public transit vehicle driving process in view of the above, and with this information uploading to this base station controller, the time of proofreading this Vehicle mounted station according to the time of this base station controller.Set up the full duplex radio link between base station controller and the Vehicle mounted station,, carry out exchanges data by the frame request and the mode of replying; Adopt the one-way data transmission between website transmitter and the Vehicle mounted station, by the website transmitter to Vehicle mounted station sending station dot information; Between this base station controller and the higher level's main control computer by the two-way exchanges data of carrying out of communication port.
Above-mentioned website transmitter comprises multichannel address code generator, frequency multiplier, modulator, transmitter, realizes tamed spread spectrum by multichannel address code generator and frequency multiplier, and site information modulation back is launched with wireless mode.That this tamed spread spectrum adopts is a kind of, and (N, K) coding are that the pseudo-random code of N goes to replace K position information with one with length promptly, and K position information has 2
k Individual state needs 2
kBar is long to go representative for the pseudo-random code of N, and its spreading ratio is N/K.
Length is that the pseudo-random code of N adopts GOLD sign indicating number sequence in the above-mentioned tamed spread spectrum coding, and length is identical, speed is identical but two m sequence preferences that polynomial expression produced that code word is different add mould 2 and form by two for this yard.
Above-mentioned base station controller and Vehicle mounted station comprise: reception, transmitter, spread spectrum, despreader, coding, demoder, message handler, information-storing device.Wherein, receiver and transmitter are used for realizing the radio communication of full duplex; The spread spectrum despreader is realized the encryption of signal and the antijamming capability of enhancing signal; This coding, demoder are finished the error checking and correction (ECC) of single information of satisfying the need; Message handler finish the road list formation, binding and layout, separate the check and correction of frame and time; It is single that information storage system then is mainly used to store the road.
Above-mentioned volume, code translator adopt Cyclic Redundancy Check to come information is carried out error detection to the error checking and correction (ECC) of information; Use based on (8,4) block code of (7,4) reflected code information is carried out 1 error correction; Block interleaved device with 8*N carries out error correction to long burst error.It is g (x)=x that this (7,4) reflected code has adopted generator polynomial
3The reflected code of+x+1; Should (8,4) block code be according to actual needs, on the basis of (7,4) reflected code, increase a check bit in addition and generate according to the big as far as possible rule of code distance; This 8*N block interleaved device is with a burst error channel that memory is arranged, transforming as is the channel of memoryless independent error at random basically, the data to be sent such as back of promptly will being encoded by transmitting terminal are woven into the matrix of a 8 * N by per 8 delegation of the correct order of information, write by row during transmission, read by row during reception, Burst Channel is transformed to the accidental channel of equivalence; It is g (x)=1+x that this CRC adopts generator polynomial
2+ x
15+ x
16The CRC-16 sign indicating number information of transmitting terminal is calculated.
Real-time control management method of the present invention comprises the wireless data communications between website transmitter and the Vehicle mounted station, the data communication between Vehicle mounted station and base station controller, the data communication between base station controller and base station computer.By the data communication between website transmitter and the Vehicle mounted station, set up the wireless unidirectional data transmission channel of website transmitter to Vehicle mounted station, by the website transmitter to this Vehicle mounted station sending station dot information; Full duplex radio link is between the two set up in data communication control by base station controller and Vehicle mounted station, with the frame request and the mode of replying, carries out exchanges data; By the control of the data communication between base station controller and the higher level's main control computer, realize both bidirectional data exchange.Wherein:
A. communicating by letter between website transmitter and the mobile unit, be by the website transmitter periodically send the website of our station, and through the road call information of each bar route of our station, receive this call signal by mobile unit, and the time keeping of inciting somebody to action at that time gets off, deposit equipment in as time of entering the station and departures time, if mobile unit is not the transmission information that receives this station for the first time, then time keeping is at that time got off, and upgrade the outbound information of storing in the mobile unit external memory with this, till the signal that does not receive this station.
B. Vehicle mounted station and base station controller communicates by letter, be when Vehicle mounted station receives call signal from base station controller, compare, judge with the date in date and time information in the call signal and the Vehicle mounted station external memory earlier, if change, then with the temporal information that comprised in the call signal this moment as benchmark, proofread and correct the temporal information of Vehicle mounted station; This Vehicle mounted station is correct for the first time to be received if this is received as, then deposit the external memory of this Vehicle mounted station in as the time of entering the station and departures time with time at that time, if also have the data that do not send in the external memory, then Vehicle mounted station and this base station controller are set up communication link, and the mode of retransmitting with error detection sends information to this base station controller; Otherwise then, do not receive up to this Vehicle mounted station till the signal of this base station controller with the outbound information in the time renovated bus microscope carrier external memory at that time.
C. the data communication of base station controller and higher level's main control computer, at first set up communication linkage by request, response mode and higher level's main control computer by base station controller, after the Cyclic Redundancy Check error detection, receive from the plan of sending a car the every day of this higher level's main control computer; The mode of being retransmitted with error detection by base station controller sends the vehicle operation data that is stored in the external memory to this higher level's main control computer then, and after transmission finished, this base station controller turned to the calling to Vehicle mounted station.
Native system has following advantage:
1. write down, store, add up and upload the operation information of vehicle in use automatically, the automaticity height;
2. do not need to rent or rely on existing any cordless communication network facility, hardware device is simple.Work in open frequency range, emissive power is low, greatly reduces operation cost.
3. system flexibility is strong, and networking flexibility is applicable to that the fleet of various scales monitors, runs, manages.
4. hardware unitization structure, Data Receiving/processing separates, and is easy to upgrading and safeguards.
5. client/server configuration is adopted in software modularity design, and is stable and reliable for performance.
Description of drawings:
Fig. 1 is an electronic road form system schematic of the present invention
Fig. 2 is the electronic road form block diagram of system of the present invention
Fig. 3 is a website transmitter theory diagram
Fig. 4 is the tamed spread spectrum schematic diagram
Fig. 5 is a GOLD sign indicating number sequencer structural drawing
Fig. 6 is base station controller, Vehicle mounted station theory diagram
Fig. 7 is coding, decoding schematic diagram
Fig. 8 is a CRC-16 bit shift register structural drawing
Fig. 9 is a communication software process flow diagram between mobile unit and website transmitter
The software flow pattern of Figure 10 for communicating by letter between mobile unit and base station controller
The software flow pattern of Figure 11 for communicating by letter between base station controller and base station computer
Embodiment:
As shown in Figure 1, this electronic road form system mainly is made up of website transmitter, Vehicle mounted station, base station controller and the hardware such as computing machine that are attached thereto.Wherein, base station controller is set at the main website (starting point) and the extension station (terminal point) of driving route, and the website transmitter is set at each website on the driving route, comprises main website (starting point) and extension station (terminal point)), both radiation scopes are 100 to 150 meters.
As shown in Figure 2, at the operation management of vehicle, public transit system has set up three departments separately according to function: schedule level one (Public Transportation Corporation), second-level dispatching (public transport branch office), three grades of scheduling (line management).The electronic road form part mainly is located at three grades of scheduling parts, to finish the major function of line management.Adopt remote dial to be connected in the system between the main control computer of main website or extension station and the second-level dispatching, adopt communication port to be connected between the base station controller of main website or extension station and the main control computer, the employing full duplex radio is connected between the base station controller of main website or extension station and the Vehicle mounted station.Adopt uni-directional wireless to be connected between Vehicle mounted station and the website transmitter.The function that base station controller is mainly finished has the driving of receipts plan, time check and correction, storage road list, information processing, dialup networking, road single upload etc., and the function that Vehicle mounted station is mainly finished has recording storage road list, the unidirectional base station controller in road to upload, the time proofreads etc.The function that the website transmitter is mainly finished has circulation sending station dot information.Groundwork process between them is as follows:
Beginning along with operation every day, second-level dispatching at first by network will the same day driving plan of this circuit send in the main control computer of three grades of scheduling, when corresponding base station controller and this main control computer are got in touch with by communication port, can obtain the driving plan on the same day, and imitate time according to time of main control computer to base station controller, to guarantee the single accuracy in time in road.Base station controller also in time imports the single information in the road of being write down into computing machine.Meanwhile, base station controller is rotated paging to each vehicle according to plan, when public transit vehicle enters in the wireless coverage of base station controller, just set up both full duplex radio links, by the frame request and the mode of replying, Vehicle mounted station writes down the single information in new road on the one hand, and the single information uploading in the road that will write down is to base station controller on the one hand, and proof time at any time.When the information of dispatching a car of Vehicle mounted station as received basis station control, just on-time departure main website or extension station perhaps go back to the field, perhaps begin the operation of a new round, write down information such as time of leaving, name of station, license number, Lu Hao simultaneously.When the website transmitter on the Vehicle mounted station route via, put down in writing public transit vehicle relevant information at this moment, for example, pass in and out time, name of station, road number, license number, name driver of this website etc.Therefore get off for one time, Vehicle mounted station has just been stored the single essential information in a large amount of roads, and it is single just in time to upload the road when entering main website or extension station once more and meet base station controller.Like this, after one day operation finished, base station controller was crossed network with the road single-pass of this circuit and is imported higher level's scheduling into.Thereby realize that the road simple form becomes, the electronization of road single transport, robotization.
Referring to Fig. 3, the website transmitter is realized tamed spread spectrum by multichannel address code generator, again through ovennodulation, transfers out with wireless mode at last.This multichannel address code generating technique is the FDMA (frequency division multiple access) that continues in recent years, TDMA (time division multiple access (TDMA)) afterwards, the emerging communication technology that grows up.This technology is essential characteristic with the CDMA, and spread spectrum is the basis, and according to different separately coded sequences, promptly the different wave of signal is distinguished different user institute information transmitted.Tamed spread spectrum then is to adopt special modulation scheme, and the spread spectrum of information is transmitted in the broadband.Commercial spread spectrum technique commonly used mainly contains two kinds of direct sequence spread spectrum and frequency hoppings, because the pseudorandom code check is very high, cause the non-constant width of radio frequency bandwidth, so under the limited situation of some frequency bands, be difficult to satisfy the requirement of system, the present invention adopts the tamed spread spectrum technology for this reason, and tamed spread spectrum is meant certain slow variation of frequency spectrum.It is different with general straight spread spectrum, general straight expansion is that information code and pseudo-random code are carried out sequence after mould two Calais obtain to expand, and spread-spectrum pseudorandom codes is much larger than the chip rate of information code, tamed spread spectrum then is to adopt Methods for Coding to finish the expansion of spread spectrum, promptly uses the corresponding pseudo-random code of several information code elements.
Referring to Fig. 4, this tamed spread spectrum is imported the K bit shift register successively with raw information earlier, again with this K position information code element while input coding device, forms the pseudo-random code output that length is N through the tamed spread spectrum coding, and with replacement K position information, K position information has 2
k Individual state needs 2
kBar is long to go representative for the pseudo-random code of N, and its spreading ratio is N/K.The key that realizes tamed spread spectrum is how to select suitable pseudo-random code, selected pseudo-random sequence not only will have good in, their cross correlation and long periodicity, and the random series number also should be many as much as possible, because this is directly connected to the utilization factor of the networking capability and the frequency spectrum of system.For this reason, the present invention has adopted the GOLD sign indicating number as pseudo-random code.
Referring to Fig. 5, the present invention selects for use the GOLD pseudo-random code as spreading code, and per 8 information codes are carried out pseudorandomcode one time.This sign indicating number is by progression r=9, and length is 511, speed is identical but two polynomial f (x)=1+x that code word is different
4+ x
9, g (x)=1+x
3+ x
4+ x
6+ x
9The m sequence preference that is produced produces after mould 2 is added.Spreading ratio is 63.8, up to 27.08dB, can reach spread spectrum preferably to anti-interference, anti fading requirement to the inhibition of carrier wave.
Referring to Fig. 6, base station controller and Vehicle mounted station comprise: reception, transmitter, spread spectrum, despreader, coding, demoder, message handler, information-storing device.Wherein, receiver and transmitter are used for realizing the radio communication of full duplex; Spread spectrum, despreader adopt tamed spread spectrum and corresponding soft despreading to realize the encryption of signal and the antijamming capability of enhancing signal; Coding, demoder single information that is used to satisfy the need are carried out error detection, error correction, the accuracy of guarantee information, message handler finish the road list formation, binding and layout, separate frame and time check and correction; It is single that information-storing device is mainly used to store the road.
With reference to Fig. 7, coding of the present invention, demoder adopt Cyclic Redundancy Check single information of satisfying the need to carry out error detection; Employing is carried out 1 error correction based on (8,4) block code of (7,4) reflected code single information of satisfying the need; Adopt the block interleaved device of 8*N that long burst error is carried out error correction.Wherein:
It is g (x)=x that (7,4) reflected code has adopted generator polynomial
3The reflected code of+x+1.This coding can be corrected two dislocation sign indicating numbers of all dislocation sign indicating numbers and a part.The block code that native system adopted is according to actual needs, (7,4) increase a check bit in addition according to the big as far as possible rule of code distance on the basis of reflected code and generate (8,4) block code, it is as shown in the table for the corresponding relation before and after this block code coding between code word.
| Before the coding | Behind the coding | Before the coding | Behind the coding | Before the coding | Behind the coding | Before the coding | Behind the coding |
| 0000 | 00000001 | 0001 | ?00010111 | ?0010 | ?00101101 | ?0011 | ?00111010 |
| 0100 | 01001110 | 0101 | ?01011001 | ?0110 | ?01100010 | ?0111 | ?01110100 |
| 1000 | 10001011 | 1001 | ?10011100 | ?1010 | ?10100110 | ?1011 | ?10110001 |
| 1100 | 11000101 | 1101 | ?11010010 | ?1110 | ?11101000 | ?1111 | ?11111110 |
The 8*N block interleaved is a burst error channel that memory is arranged, and transforming as is the channel of memoryless independent error at random basically.Because for wireless fading channel, the appearance of mistake generally is paroxysmal, and a burst error can cause a series of mistake, because the error coding technology that native system adopted once can only be corrected the dislocation sign indicating number in 8 bit word, can't solve the correct reception problem of a succession of wrong code word.For inferior native system by the interleaving and de-interleaving technology with a burst error channel that memory is arranged, transforming as is the channel of memoryless independent error at random basically.Its concrete scheme is that the data to be sent such as back of will being encoded by transmitting terminal are woven into the matrix of a 8 * N by per 8 delegation of the correct order of information, writes by row during transmission, reads by row during reception, Burst Channel is transformed to the accidental channel of equivalence.The decoding error that sudden mistake causes can be reduced greatly with this technology, improve the accuracy rate of information transmission.
It is g (x)=1+x that CRC adopts generator polynomial
2+ x
15+ x
16The CRC-16 sign indicating number information of transmitting terminal is calculated, it is constructed shown in 8.It is to utilize the principle of division and remainder to make error-detecting.During practical application, calculated crc value and together sent to receiving trap with data by dispensing device, receiving trap recomputates CRC to the data of receiving and compares with the CRC that receives, if two crc value differences then illustrate to occur mistake in the data communication.Below be the computation process of CRC-16:
1. the CRC register is set, and gives its assignment FFFF (hex).
2. first 8-bit character of data and the least-significant byte of 16 CRC registers are carried out XOR, and the result is deposited in the CRC register.
3.CRC register moves right one, LSB is shifted out and checks in the MSB zero padding.
4., repeated for the 3rd step if LSB is 0; If LSB is 1, CRC register and polynomial code be XOR mutually.
5. repeating for the 3rd and the 4th step all finishes up to 8 displacements.This moment, first 8-bit data processing finished.
6. repeating for the 2nd to the 5th step all finishes dealing with up to all data.
7. the content of final CRC register is crc value.
With this CRC check can find burst-length less than n-k+ 1 wrong and burst-length more than or equal to the part mistake of n-k+ 1.
The generation of multichannel address, tamed spread spectrum and coding among above-mentioned Fig. 3, Fig. 4, Fig. 6, Fig. 7, decoding all realize by software, promptly at the base station controller of system, the website generator is equipped with the microprocessor that solidifies its multichannel address generation, tamed spread spectrum and coding, decoding software respectively in the Vehicle mounted station three part hardware devices.
Referring to Fig. 9, the wireless data communications flow process between website transmitter of the present invention and the Vehicle mounted station is as follows:
Website transmitter on the way periodically sends call signal, and this signal comprises the site information of our station and the road information of passing through each bar route of our station.Vehicle mounted station is in accepting state at run duration always, waits for receiving calling signal.In case Vehicle mounted station enters in the communication range of website transmitter, just set up communication link with it, to finish the information transmission between them.Whether whether the Vehicle mounted station basis receives transmitting of website transmitter is judged vehicle into and out of website, simultaneously these information is got off as the operation state information stores.In the radiation areas of website transmitter, when Vehicle mounted station receives the CDMA signal of this station transmission first, just detect and discern the website characteristic signal of this car institute corresponding line, in case determine that Vehicle mounted station correctly receives the website call signal, attend school the Vehicle mounted station clock, write down the time at that time, deposit in the external memory of mobile unit as vehicle pull-in time and departures time; If mobile unit is not the transmission information that receives this station for the first time, then time keeping is at that time got off, and upgrade the outbound information of storing in the mobile unit external memory, till the signal that does not receive this station with this.At this moment, the time of entering the station of vehicle and departures time have been recorded in the external memory of Vehicle mounted station exactly, together with other information, form the single essential information in road.
Referring to Figure 10, the data communication flow process between Vehicle mounted station of the present invention and base station controller is as follows:
Base station controller carries out paging by turns by the driving plan to each public transit vehicle, and Vehicle mounted station is in accepting state at run duration always, waits for receiving calling signal.When public transit vehicle entered in the wireless coverage of base station controller, this base station controller was set up between the two full duplex radio link according to address code, to finish exchanges data.The Vehicle mounted station recursive call receives program, until correctly receiving the call signal that comes from base station controller.At this moment, earlier the date in date and time information in the call signal and the Vehicle mounted station external memory is compared, judge whether to change.If change, then with the temporal information that comprised in the call signal this moment as benchmark, proofread and correct the temporal information of Vehicle mounted station.If Vehicle mounted station correctly receives for the first time the information that base station controller sends, then read the Vehicle mounted station clock, and time keeping is at that time got off, deposit in the external memory of mobile unit as time of entering the station and departures time.Simultaneously, judge whether do not send out data in the external memory.If have, then set up communication link with base station controller, the mode of retransmitting with error detection sends vehicle operating information to base station controller, promptly at first Vehicle mounted station will judge whether to receive the ack signal that base station controller is sent back, if receive, then next whether judgment data has sent and has finished, if do not have, then send the next frame data, and wait for the reception ack signal; If do not receive, judge next that then whether receive the NAK signal that base station controller sends back totally reaches 3 times, if do not have, then retransmits former frame data; If accumulative total receives the NAK signal 3 times, perhaps sent all data, then return the call signal that receives base station controller.Equally,, also write down the time at that time if Vehicle mounted station is not when correctly receiving the transmission information of this base station controller for the first time, and with the outbound information in this renovated bus microscope carrier external memory.Return the call signal that receives base station controller then.
Referring to Figure 11, the data communication flow process between base station controller and base station computer is as follows:
Every day, base station controller at first will be responsible for receiving the plan of sending a car the every day that comes from higher level's main control computer, judges whether base station controller receives the RTS signal that higher level's main control computer is sent when beginning, if do not have, then returned and continued to receive; If base station controller has received the RTS signal of sending from higher level's main control computer, judge then then whether base station controller is busy, if busy, then base station controller will not respond; If it is not busy, then return cts signal, establish a communications link with the reception plan of sending a car, judge then whether CRC check is correct with main control computer, if it is wrong, then add up the NAK signal that receives and whether surpass 3 times,, return the NAK signal if do not have, again establish a communications link with main control computer, if surpass 3 times, the processing that then reports an error is returned and is received the RTS signal that higher level's main control computer is sent again; If CRC check is correct, then return ack signal, thereby finish data transmission, and whole transmission course is not subjected to the influence of other interruption sending a car to plan.Base station controller is responsible for sending the vehicle operation data that is stored in its external memory to main control computer, and Frame is directly sent in the main control computer by serial ports after taking out from external memory.If main control computer returns the response ack signal, whether base station controller elder generation judgment data sends and finishes, and determines whether sending the next frame data more in view of the above; If return response NAK signal, then resend former frame data, until retransmitting three times.After final data sent and finishes, base station controller turned to the calling order of execution to Vehicle mounted station.
The present invention only provides an embodiment.Obviously, described those skilled in the art can utilize technical conceive of the present invention, make multiple similar electronic road form system.
Claims (10)
1. electronic road form system is characterized in that this system comprises:
A. base station controller, be used to receive driving plan on the same day from higher level's main control computer, and be that benchmark is imitated the time to this base station controller with time of this main control computer, handle the single information in road that this base station controller writes down, and in time import this main control computer into;
B. the website transmitter is used for public transit vehicle is sent call signal;
C. Vehicle mounted station is used for writing down, store the single information in road that public transit vehicle travels, and this information uploading is arrived this base station controller, and the time of proofreading this Vehicle mounted station according to the time of this base station controller;
Have the full duplex radio link between this Vehicle mounted station and this base station controller,, carry out exchanges data by the frame request and the mode of replying; Adopt the wireless unidirectional data transfer mode between this website transmitter and this Vehicle mounted station, by the website transmitter to Vehicle mounted station sending station dot information; Between this base station controller and the higher level's main control computer by the two-way exchanges data of carrying out of communication port.
2, electronic road form according to claim 1 system, it is characterized in that described website transmitter comprises multichannel address code generator, frequency multiplier, modulator, transmitter, realize tamed spread spectrum by multichannel address code generator and frequency multiplier, site information modulation back is launched with wireless mode; That this tamed spread spectrum adopts is a kind of, and (N, K) coding promptly longly go to replace K position information for the pseudo-random code of N with one, and K position information has 2
kIndividual state needs 2
kBar is long to go representative for the pseudo-random code of N, and its spreading ratio is N/K.
3, electronic road form according to claim 2 system, it is characterized in that length in the described tamed spread spectrum coding is that the pseudo-random code of N adopts GOLD sign indicating number sequence, length is identical, speed is identical but two m sequences that polynomial expression produced that code word is different add mould 2 and form by two for this yard.
4, electronic road form according to claim 1 system is characterized in that described base station controller and Vehicle mounted station, comprises reception, transmitter, spread spectrum, despreader, coding, demoder, message handler, information-storing device; This receiver and transmitter are used for realizing the wireless messages communication of full duplex; This spread spectrum, despreader are realized the encryption of signal and the antijamming capability of enhancing signal; This coding, demoder are finished the error checking and correction (ECC) of single information of satisfying the need; This message handler finish the road list formation, binding and layout, separate the check and correction of frame and time; It is single that this information-storing device then is mainly used to store the road.
5, electronic road form according to claim 4 system, it is characterized in that described coding, demoder adopt cyclic redundancy check (CRC) single information of satisfying the need to carry out error detection, employing is based on (7,4) (8 of reflected code, 4) block code single information of satisfying the need is carried out 1 error correction, adopts the block interleaved device of 8*N that long burst error is carried out error correction.
6, electronic road form according to claim 5 system is characterized in that it is g (x)=x that described (7,4) reflected code has adopted generator polynomial
3The reflected code of+x+1; (8,4) block code is according to actual needs, increases in addition a check bit according to the big as far as possible rule of code distance and generate on the basis of (7,4) reflected code; 8*N block interleaved device is with a burst error channel that memory is arranged, transforming as is the channel of memoryless independent error at random basically, the data to be sent such as back of promptly will being encoded by transmitting terminal are woven into the matrix of a 8 * N by per 8 delegation of the correct order of information, write by row during transmission, read by row during reception, Burst Channel is transformed to the accidental channel of equivalence; It is g (x)=1+x that CRC adopts generator polynomial
2+ x
15+ x
16The CRC-16 sign indicating number information of transmitting terminal is calculated.
7, the real-time control management method of a kind of electronic road form system, it is characterized in that this method comprises: by the data communication between website transmitter and the Vehicle mounted station, set up the wireless unidirectional data transmission channel of website transmitter to Vehicle mounted station, by the website transmitter to this Vehicle mounted station sending station dot information; Full duplex radio link is between the two set up in data communication control by base station controller and Vehicle mounted station, with the frame request and the mode of replying, carries out exchanges data; By the control of the data communication between base station controller and the higher level's main control computer, realize both bidirectional data exchange.
8, the real-time control management method of electronic road form according to claim 7 system, it is characterized in that the wireless data communications between described website transmitter and the Vehicle mounted station, be periodically to send the website of our station and through the road call information of each bar route of our station by the website transmitter, receive this call signal by mobile unit, and the time keeping of inciting somebody to action at that time gets off, deposit equipment in as time of entering the station and departures time, if Vehicle mounted station is not the transmission information that receives this station for the first time, then time keeping is at that time got off, and upgrade the outbound information of storing in the mobile unit external memory with this, till the signal that does not receive this station.
9, the real-time control management method of electronic road form according to claim 7 system, it is characterized in that the data communication between described Vehicle mounted station and base station controller, be when Vehicle mounted station receives call signal from base station controller, compare, judge with the date in date and time information in the call signal and the Vehicle mounted station external memory earlier, if change, then with the temporal information that comprised in the call signal this moment as benchmark, proofread and correct the temporal information of Vehicle mounted station; This Vehicle mounted station is correct for the first time to be received if this is received as, then deposit the external memory of this Vehicle mounted station in as the time of entering the station and departures time with time at that time, if also have the data that do not send in the external memory, then Vehicle mounted station and this base station controller are set up communication link, and the mode of retransmitting with error detection sends information to this base station controller; Otherwise then, do not receive up to this Vehicle mounted station till the signal of this base station controller with the outbound information in the time renovated bus microscope carrier external memory at that time.
10, the real-time control management method of electronic road form according to claim 7 system, it is characterized in that the data communication between described base station controller and higher level's main control computer, at first pass through request by base station controller, response mode and higher level's main control computer are set up communication linkage, after the cyclic redundancy check (CRC) error detection, reception is from the plan of sending a car the every day of higher level's main control computer, the mode of being retransmitted with error detection by base station controller sends the vehicle operation data that is stored in its external memory to higher level's main control computer then, after transmission finished, this base station controller turned to the calling to Vehicle mounted station.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021393745A CN1159686C (en) | 2002-08-21 | 2002-08-21 | Electronic traffic record system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021393745A CN1159686C (en) | 2002-08-21 | 2002-08-21 | Electronic traffic record system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1399232A CN1399232A (en) | 2003-02-26 |
| CN1159686C true CN1159686C (en) | 2004-07-28 |
Family
ID=4750053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021393745A Expired - Fee Related CN1159686C (en) | 2002-08-21 | 2002-08-21 | Electronic traffic record system |
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| Country | Link |
|---|---|
| CN (1) | CN1159686C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1764085B (en) * | 2004-10-19 | 2010-04-21 | 萧如宣 | Information dissemination system based on public transport system and its operation method |
| CN104464269A (en) * | 2013-09-25 | 2015-03-25 | 无锡信荣电子科技有限公司 | Vehicle dispatch management system |
| CN111653116A (en) * | 2020-05-28 | 2020-09-11 | 北京瑞华赢科技发展有限公司 | Automatic generating system for electronic waybill of bus |
| CN111652630A (en) * | 2020-05-29 | 2020-09-11 | 北京瑞华赢科技发展有限公司 | System and method for verifying validity of electronic waybill of bus |
-
2002
- 2002-08-21 CN CNB021393745A patent/CN1159686C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1399232A (en) | 2003-02-26 |
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