CN105405311A - Positioning and broadcasting system of bus on-board device and stations based on wireless radio frequency technology - Google Patents
Positioning and broadcasting system of bus on-board device and stations based on wireless radio frequency technology Download PDFInfo
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- CN105405311A CN105405311A CN201510807873.8A CN201510807873A CN105405311A CN 105405311 A CN105405311 A CN 105405311A CN 201510807873 A CN201510807873 A CN 201510807873A CN 105405311 A CN105405311 A CN 105405311A
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Abstract
The invention uses the wireless radio frequency communication technology to position buses instead of the GPS positioning technology and the mobile communication technology, and uses the single-chip microcomputer technology, the voice synthesis technology and the liquid crystal display technology to achieve the information display and voice broadcast of an on-board device and the stations. The system comprises two portions of an on-board portion and a station portion which all take the single-chip microcomputer technology as cores, and take wireless transmit-receive modules nRF401 as communication carriers. The information transmission among the vehicle and the stations and among the stations is realized. In the vehicle and at the station, voice synthesis chips, namely ISD 25120 chips, are used to record and play the voice through mode selection and key circuits. Liquid crystal display chips, namely LCD 12864 chips, are used to display the information. Meanwhile through successive information transmission between the adjacent stations, the vehicle positioning purpose that how many stations are there between the vehicle and the home station is achieved.
Description
1. technical field
The present invention uses twireless radio-frequency communication technical substitution GPS location technology and mobile communication technology to carry out the location of bus, and realizes vehicle-mounted display with platform and report.This system is made up of vehicle-mounted part and platform part two parts, vehicle-mounted part and platform part are all core with singlechip technology, using radio receiving transmitting module nRF401 as communications carrier, realize the information transmission between vehicle and platform, utilize speech synthesis technique and lcd technology at Che Nei or platform, carry out voice broadcast and display.Meanwhile, by the transmission of information in succession between adjacent platform, reach the vehicle location object that vehicle distances our station also has a few station.
2, background technology
Public transit vehicle system, from initial special messenger's ticketing to self-service ticketing, from semi-automatic sound broadcast of manually calling out the stops, develops into the intelligent public transportation system of today.Intelligent public transportation system is by the sensor technology of advanced person, the communication technology, computer networking technology, automatic control technology etc. organically to combine and be used in management system of public traffic and set up a kind of in real time, accurately, efficient public transportation management and control system, greatly increase Bus information service level, improve public transit system efficiency of operation.
Current big and medium-sized cities bus stop reporting mode mainly contains following several:
1. manual electronic is called out the stops: the every website of vehicle, and driver needs to press corresponding button to start sound broadcast system.This mode of calling out the stops needs to control by driver, not only increases the operation of driver, also there is certain potential safety hazard.
2. GPS positioning system is utilized to call out the stops: this mode of calling out the stops is Full-automatic station-reporting, allocation is really calculated residing for vehicle according to the locator data (latitude and longitude information) of GPS, call out the stops accurately, but it is produced and operating cost costliness, and need professional to safeguard.
3. vehicle operation characteristic is utilized to carry out automatic broadcasting: this reporting station method is beaten the mode of steering indicating light according to the operating range after starting, switch gate signal and entering the station and integrated and judge whether vehicle arrives at a station.This method requires that driver must drive by specification, if driver operates lack of standardization or runs into special circumstances, such as stop off etc., just likely cause mistake of calling out the stops.
Current intelligent public transportation system is generally core with Computer network, and with GPS location technology and mobile communication technology for being positioned communications carrier, the command, control, communications, and information realized between the location of public transit vehicle and vehicle-mounted and platform shows and reports.System scale is huge, build and operation expense high.
Less radio-frequency nRF401 is the UHF radio transmitting and receiving chip of a monolithic, is operated in 433MHZISM frequency range, and most high workload speed can reach 20K.Emissive power also can adjust, and maximum emissive power is 10dBm.Adopt FSK modulation-demodulation technique, antijamming capability is strong.Adopt PLL frequency synthesis technique, frequency stability is good.Sensitivity, up to-105dBm, without the need to licence, has 2 channels.Only need external a small amount of element, a complete radio-frequency (RF) transceiver can be formed, be suitable for the occasion of distance 1km.Antennal interface can be designed as differential antennae, like this can the PCB antenna of low cost easy to use, and nRF401 also has one of standby mode large feature, can reach low power dissipation design.
The present invention, based on singlechip technology, uses radio receiving transmitting module, voice broadcast module, LCD MODULE to complete whole bus location, display and voice broadcast.
3, summary of the invention
The vehicle-mounted location with platform of a kind of bus based on wireless radio-frequency and broadcasting system, native system is divided into two large divisions: vehicle-mounted and platform part. and these two parts are all take single-chip microcomputer as core, with nRF401 wireless module for carrier, functional realiey is completed by voice broadcast module and LCD MODULE. difference is, vehicle-mounted part needs key circuit to complete the record of speech chip, work of knocking off, and platform part is undertaken directly actuated by single-chip microcomputer.The structure principle chart of vehicle-mounted part and platform part as shown in Figure 1.Each part is made up of main control module, radio receiving transmitting module, voice broadcast module and LCD MODULE etc. and main control module is the core of whole system, and other submodule depends on it and normally works; Wireless module is the carrier of communication, and the location of bus is realized by it; Voice broadcast module is reported by the control of single-chip microcomputer to it; LCD MODULE is then the content of voice broadcast shown by the form of display.Wherein main control module uses is AT89S52 single-chip microcomputer, sound broadcast module uses ISD25120 chip, by model selection and key circuit, can in advance by required voice messaging typing, then select manually to report or automatically report by the button that control A8, A9 are connected.Display module uses LCD12864 chip display station station information.
The communication mode of native system is, the wireless module nRF401 of vehicle-mounted part is in receiving mode when starting, when it receives the station platform information that platform wireless module sends, the TXD/P3.1 being sent to single-chip microcomputer is held to hold by the DIN of nRF401, after single-chip microcomputer receives Frame, control voice module voice broadcast and LCD MODULE display corresponding information, meanwhile, the T0/P3.4 of single-chip microcomputer holds transmission 0 to hold to the TXEN of nRF401, nRF401 is made to change pattern, emission state is changed into by accepting state, the information such as the train number of bus are sent to the wireless module of platform, platform part sends order upon receipt of the signal again allows the LCD display module of the voice module of platform carry out work, this information of vehicles is also provided to adjacent platform by platform.
In general, the distance between city bus station is 500 ~ 1000m.Conventional wireless data transmission module (as nRF401) can meet this transmission range.Install this wireless data transfer module at each station, each like this station can realize and Wireless Data Transmission between adjacent station.After car arrives at a station, bus can send information to station.This station is transmitted to next station this information package, and next station forwards again, by that analogy until control room receives this information.
Starting station Sa timing (1S) can send a form to S1.S1 is transmitted to S2 again, and force transfer goes down successively, until control room receives this form (this communication link frequency of operation f1=433.92MHz).When there being bus to arrive certain station (as bus A to S2 stands), can send to station S2 information (this communication link RF401 frequency of operation f2=434.33MHz) of arriving at a station.This information comprises license plate number and travel direction, after station S2 receives this information, information is put in people's register.When form is delivered to S2 station from S1, the information that vehicle A arrives at a station is enrolled form (namely adding station number S2 and license plate number A), and then form relay going down. last, the form containing all stations and bus information is finally transferred to last node Sb, i.e. control room.Process by analysis, on the giant-screen of control room administrative center, show each car present position this moment on the one hand, on the other hand real time data is issued each electronic stop plate.
The problem solving Data duplication collection is in the following way after a certain station board receives the token and data that last station board transmits, first the license plate number of the bus that station board above had gathered is recorded, then broadcast is sent, call out the bus within its communication range, carry out the synchronous of data transmission, each bus adopts time-sharing format to upload this car data after receiving synchronizing signal, and station board receives respectively.Two judgements to be done: the first, in the license plate number data whether Already in last station board transmits of this car before reception; The second, whether the mileage value in the Frame that this car is uploaded is less than the absolute distance of station board.If meet this two conditions simultaneously, then determine to receive this car data, be saved in corresponding data register, wait for that collecting all car datas is transmitted to next station board together.Otherwise, if having one not meet in the middle of two conditions, then do not communicate with this car.Profit in this way, not only solve the problem that bus Data duplication gathers, also be convenient to control room analyzing and processing data simultaneously, directly can obtain the bus data that this station board of distance is nearest on certain station board garage direction, the working time arriving certain station board can be calculated at the average speed according to bus.
4, accompanying drawing explanation
Fig. 1 is the structure principle chart of vehicle-mounted part and platform part; Fig. 2 is vehicle-mounted fractional hardware wiring diagram; Fig. 3 is platform part hardware connection figure.
5, embodiment
(1) connection of speech chip ISD25120 and single-chip microcomputer
A1/M1, A2/M2, A3/M3, A4/M4, A5/M5 and A7/M7 six port ground connection, select continuous playback working method.
ANAOUT end connects power amplifier.
A0/M0 is address/model selection, and A0/M0 end is connected with the P0.0 port of AT89S52 single board computer.
A6/M, A8, A9 are connected with the P0.1 port of AT89S52 single board computer. work as A8, when A9 end is for high level, these seven ports of A0 ~ A6 are mode of operation selecting side, the present invention selects A6 to hold, in such cases, switch S 1, S2, S3 can carry out work selection, and its function is that " start/suspend " " stops/reset " " record/playback " respectively.A6, A8, A9 in the end of address are connect high level, and remaining address line connects low level, can realize the consecutive order recording playback of multistage.P/R end (S3) is put for low during recording, click the startup/Pause key (S1) of CE end, namely first paragraph of recording is started, namely startup/the Pause key (S1) clicking CE end again stops, one section of End of Tape. the button repeatedly held by CE then can record section below, until chip record is full, or click reset key (S2) system reset of PD end.Put P/R end (S3) during playback for high, click the startup/Pause key (S1) of CE end, namely start playback first paragraph, section terminates or clicks CE halfway to hold S1 key (S2) i.e. playback to stop; Press the S1 key playback second segment again of CE end again, so play.If so when wanting to select manually to call out the stops, just can S5 be pressed the button, make A8, A9 become high level, otherwise, if when A8, A9 are low level, automatic play mode will be entered.
Sheet choosing end
be connected with the P1.0 port of AT89S52 single board computer. after this pin becomes low level (PD holds as low level simultaneously), allow to carry out recording playback work.
Economize on electricity control end PD is connected with the P1.1 mouth of AT89S52 single board computer. and this termination low level can make chip enter the electricity-saving state of not power consumption.
hold and control selecting side for recording/putting, it is connected with the P1.2 port of AT89S52 single board computer, selects playback during high level, selects recording during low level.
for record/playback end signal output terminal,
end is connected with the P1.7 port of AT89S52 single board computer, and playback runs into
during mark, this pin output low level pulse. chip internal can detect supply voltage and carry out maintenance information integrality, and when voltage is lower than 3.5V, this end becomes low level, and now chip can only playback.
XCLK is external clock input end.
(2) connection of radio frequency chip nRF401 and single-chip microcomputer
The .XC1 that XC1 end and XC2 end are used to be connected crystal oscillator is crystal oscillator input, and XC2 is that crystal oscillator exports.
What ANT1 end was connected with ANT2 end is antenna circuit.
DIN end hold with the TXD/P3.1 of AT89S52 single board computer by MAX232 level transferring chip to be connected. passing through because of nRF401 serial, what support is the CMOS level of standard, single-chip microcomputer is then Transistor-Transistor Logic level, so needing to carry out level conversion .DIN end is serial input mouth, so hold Serial output mouth to be connected with the TXD/P3.1 of single-chip microcomputer. the information that single-chip microcomputer will convey to nRF holds the DOUT being sent to nRF401 to hold from the RXD/P3.0 of single-chip microcomputer.
DOUT end is that to hold the .DOUT that is connected to hold by MAX232 level transferring chip with the RXD/P3.0 of AT89S52 single board computer be Serial output mouth, so hold the be connected information of .nRF401 of serial input mouth to hold the TXD/P3.1 being sent to single-chip microcomputer to hold from DIN with RXD/P3.0.
CS end is with AT89S52 single board computer
the end .CS end that is connected is two kinds of channel mode selecting sides, by single-chip microcomputer
end controls. and as CS=0, be 433.92MHz; As CS=1, be 434.33MHz..
PWR-UP end holds the .PWR-UP that is connected to hold to be realize economizing on electricity controlling with the T1/P3.5 of AT89S52 single board computer, to be held control by T1/P3.5. as PWR-UP=1, and system worked well; As PWR-UP=0, system enters holding state.
TXEN end holds the .TXEN that is connected to realize transmitting/receiving control model to change with the T0/P3.4 of AT89S52 single board computer. be emission state as TXEN=1; Be accepting state as TXEN=0.
(3) chip of LCD LCD is connected with single-chip microcomputer
GND end and GND-LED end are .VCC end and the VCC-LED termination power of ground connection.
NC termination potentiometer, is used for adjusting the brightness of liquid crystal display.
PSB termination power. when the parallel port mode of PSB end for during high level being 8 or 4, when PSB end is only serial mode for during low level. because in the design, LCD12864 is parallel join, so will by PSB termination high level.
The P0.5 end of RS termination AT89S52 single board computer. when RS end is for high level, represents that DB7-DB0 is for display data, on the contrary, when RS end is for low level, represent that DB7-DB0 is idsplay order data.
The P0.6 end of R/W termination AT89S52 single board computer. when R/W end is high level and En is high level, data are read DB7-DB0; When R/W end is low level and En transfers low level to by high level, the data of DB7-DB0 are written to IR or DR.
Enable Pin En connect AT89S52 single board computer P0.7 end. when En by height on earth time, cooperations/W hold carry out writing data or instruction; When En keeps high level, R end is coordinated to carry out writing data or instruction.
DB0-DB7 is three-state data line, meets the P2.0-P2.7 of single-chip microcomputer respectively, is used for carrying out data transmission.
Claims (5)
1. location with platform vehicle-mounted based on the bus of wireless radio-frequency and broadcasting system, is characterized in that:
This system is made up of vehicle-mounted part and platform part two parts, vehicle-mounted part and platform part are all core with singlechip technology, using radio receiving transmitting module nRF401 as communications carrier, realize the information transmission between vehicle and platform, utilize speech synthesis technique and lcd technology at Che Nei or platform, carry out voice broadcast and display.Meanwhile, by the transmission of information in succession between adjacent platform, reach the vehicle location object that vehicle distances our station also has a few station.
2. the vehicle-mounted location with platform of the bus based on wireless radio-frequency as described in right 1 and broadcasting system, its vehicle-mounted part and platform part two parts feature are:
Two parts are all for core with AT89S52 single-chip microcomputer, with nRF401 wireless module for carrier, functional realiey is completed by ISD25120 voice broadcast module and LCD12864 LCD MODULE. difference is, vehicle-mounted part needs key circuit to complete recording and the playback work of speech chip, and platform part is undertaken directly actuated by single-chip microcomputer.
3. the vehicle-mounted location with platform of the bus based on wireless radio-frequency as described in right 1 and broadcasting system, the feature of its communication mode is:
The wireless module nRF401 of vehicle-mounted part is in receiving mode when starting, when it receives the station platform information that platform wireless module sends, the TXD/P3.1 being sent to single-chip microcomputer is held to hold by the DIN of nRF401, after single-chip microcomputer receives Frame, control voice module voice broadcast and LCD MODULE display corresponding information, meanwhile, the T0/P3.4 of single-chip microcomputer holds transmission 0 to hold to the TXEN of nRF401, nRF401 is made to change pattern, emission state is changed into by accepting state, the information such as the train number of bus are sent to the wireless module of platform, platform part sends order upon receipt of the signal again allows the LCD display module of the voice module of platform carry out work, this information of vehicles is also provided to adjacent platform by platform.
4. the vehicle-mounted location with platform of the bus based on wireless radio-frequency as described in right 1 and broadcasting system, the feature of its communication mode is:
In general, the distance between city bus station is 500 ~ 1000m.NRF401 wireless data transmission module meets this transmission range.Install this wireless data transfer module at each station, each like this station can realize and Wireless Data Transmission between adjacent station.After car arrives at a station, bus can send information to station.This station is transmitted to next station this information package, and next station forwards again, by that analogy until control room receives this information.
5. the vehicle-mounted location with platform of the bus based on wireless radio-frequency as described in right 4 and broadcasting system, the method solving Data duplication collection in its communication mode is:
After a certain station board receives the token and data that last station board transmits, first the license plate number of the bus that station board above had gathered is recorded, then broadcast is sent, call out the bus within its communication range, carry out the synchronous of data transmission, each bus adopts time-sharing format to upload this car data after receiving synchronizing signal, and station board receives respectively.Two judgements to be done: the first, in the license plate number data whether Already in last station board transmits of this car before reception; The second, whether the mileage value in the Frame that this car is uploaded is less than the absolute distance of station board.If meet this two conditions simultaneously, then determine to receive this car data, be saved in corresponding data register, wait for that collecting all car datas is transmitted to next station board together.Otherwise, if having one not meet in the middle of two conditions, then do not communicate with this car.Profit in this way, not only solve the problem that bus Data duplication gathers, also be convenient to control room analyzing and processing data simultaneously, directly can obtain the bus data that this station board of distance is nearest on certain station board garage direction, the working time arriving certain station board can be calculated at the average speed according to bus.
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| CN201510807873.8A CN105405311A (en) | 2015-11-20 | 2015-11-20 | Positioning and broadcasting system of bus on-board device and stations based on wireless radio frequency technology |
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| CN201510807873.8A CN105405311A (en) | 2015-11-20 | 2015-11-20 | Positioning and broadcasting system of bus on-board device and stations based on wireless radio frequency technology |
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Application publication date: 20160316 |