CN105426936A - Ambiguous path RFID system in response to manual electromagnetic shielding and interactive communication method of system - Google Patents
Ambiguous path RFID system in response to manual electromagnetic shielding and interactive communication method of system Download PDFInfo
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- CN105426936A CN105426936A CN201510741874.7A CN201510741874A CN105426936A CN 105426936 A CN105426936 A CN 105426936A CN 201510741874 A CN201510741874 A CN 201510741874A CN 105426936 A CN105426936 A CN 105426936A
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- 238000004891 communication Methods 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000002452 interceptive effect Effects 0.000 title claims abstract description 12
- 230000004044 response Effects 0.000 title abstract description 10
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 62
- 238000005303 weighing Methods 0.000 claims abstract description 15
- 150000001875 compounds Chemical class 0.000 claims description 120
- 238000012545 processing Methods 0.000 claims description 47
- 230000009467 reduction Effects 0.000 claims description 26
- 238000001914 filtration Methods 0.000 claims description 10
- 230000005855 radiation Effects 0.000 claims description 7
- 230000003044 adaptive effect Effects 0.000 claims description 5
- 235000007164 Oryza sativa Nutrition 0.000 claims description 4
- 235000009566 rice Nutrition 0.000 claims description 4
- 238000013480 data collection Methods 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 230000001960 triggered effect Effects 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract 9
- 230000005684 electric field Effects 0.000 description 12
- 230000005540 biological transmission Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 238000012544 monitoring process Methods 0.000 description 6
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- 230000035772 mutation Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
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- 241001269238 Data Species 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000008859 change Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
- G06K17/0022—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisions for transferring data to distant stations, e.g. from a sensing device
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07B—TICKET-ISSUING APPARATUS; FARE-REGISTERING APPARATUS; FRANKING APPARATUS
- G07B15/00—Arrangements or apparatus for collecting fares, tolls or entrance fees at one or more control points
- G07B15/06—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems
- G07B15/063—Arrangements for road pricing or congestion charging of vehicles or vehicle users, e.g. automatic toll systems using wireless information transmission between the vehicle and a fixed station
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Abstract
The invention relates to an ambiguous path RFID system in response to manual electromagnetic shielding and an interactive communication method of the system. The system comprises multiple RSUs, and the RSUs issue active bidirectional composite pass cards to weighing trucks; the RSUs receive ID information emitted by the active bidirectional composite pass cards, RSU response signals are emitted, the RSU response signals are received if the active bidirectional composite pass cards are not in the outer shielding state, and response signals are sent the RSUs to represent reception of the RSU path information; if the RSUs do not receive the response signals emitted by the active bidirectional composite pass cards for the second time, it is shown that the active bidirectional composite pass cards is in the outer shielding state; and if the RSUs receive the response signals emitted by the active bidirectional composite pass cards for the second time, it is shown that the active bidirectional composite pass cards are in the un-shielding state. According to the invention, the RSUs are triggered to record information of the composite pass cards when the composite pass cards are in the electromagnetic shielding state, and thus, whether electromagnetic shielding is carried out on the pass cards manually intentionally can be determined.
Description
Technical field
The present invention relates to intelligent transportation (IntelligentTransportationSystem is called for short ITS) field, particularly relate to a kind of ambiguity path radio-frequency recognition system and the interactive communication method of tackling artificial electromagnetic screen.
Background technology
The highway web frame become increasingly complex causes origin-to-destination to there are many feasible paths, i.e. the ambiguity path that causes of loop, and cannot carry out vehicle running path under the prerequisite accurately differentiated, networked fee collection cannot realize accurate charge.In addition due to the diversification of investment subjects, different sections of highway often belongs to different owners.The driving path of vehicle is accurately differentiated, can fair, split toll equitably.Simultaneously complete, accurately vehicle running path information can change card as highway, the important basis for estimation of board fee evasion behavior of changing trains.
Existing ambiguity path identifying system generally comprises roadside unit (RoadSideUnit, be called for short RSU), compound visa card (RadioFrequencyIdentificationRFID electronic tag+IC-card), data center etc., list/two-way communication can be adopted between described RSU and compound visa card, one-way communication is that compound visa card is in monitoring dormant state always, the broadcast modulation signal that the RSU that highway is arranged on the way launches can wake compound visa card up, by the induction current that Received signal strength produces, the routing information that compound visa card record RSU launches.Two-way communication adds the link of making response after compound visa card receives RSU broadcast compared to one-way communication, thus, RSU can realize the collection to compound visa card information.In order to ensure two-way communication, compound visa card need ensure power supply supply (active compound visa card).
In embody rule, part driver is in order to realize fee evasion object, compound visa card is artificially deliberately positioned in airtight canister, compound visa card is made to be in electromagnetic screen state, and then the broadcast singal of the transmitting of RSU cannot wake compound visa card up, compound visa card record path information also can not can not launch answer signal because not being waken up, and it reduces the reliability of ambiguity path identifying system, also makes owner suffer tremendous economic loss.
Summary of the invention
For above problem, the object of the present invention is to provide a kind of ambiguity path radio-frequency recognition system and the interactive communication method of tackling artificial deliberately electromagnetic screen, the method can under compound visa card be in electromagnetic screen state, trigger the information that RSU records compound visa card, thus realize determining whether artificial deliberately electromagnetic screen visa card.
For achieving the above object, the present invention adopts following technical scheme:
Tackle the ambiguity path radio-frequency recognition system of artificial electromagnetic screen, comprise multiple RSU, active bi-directional compound visa card provided by symmetrical heavy cargo car; Receive the id information of active bi-directional compound visa card transmitting according to RSU after, launch RSU answer signal, if active bi-directional compound visa card is not in external shield state, after receiving RSU answer signal, then launch answer signal to RSU and represent and receive RSU routing information; If RSU does not receive the answer signal that active bi-directional compound visa card second time is launched, then represent that active bi-directional compound visa card is in external shield state; RSU receives the answer signal that compound visa card second time is launched, then represent that active bi-directional compound visa card is in non-masked state.
Described RSU comprises the first wireless communication module, the second wireless communication module, wire communication module and 2 groups of swaying speed reduction markings;
Described first wireless communication module has the broadcast singal of RSU routing information for launching modulation;
Described second wireless communication module for receiving the id information of bidirectional active compound visa card, send answer signal and receive bidirectional active compound visa card send second time answer signal;
Described wire communication module is used for, under RSU does not receive wire communication module second time answer signal situation, bidirectional active compound visa card id information being sent to host computer database;
Described 2 groups of swaying speed reduction markings vehicle that is used for making weighing is producing vibration to trigger bidirectional active compound visa card by RSU front of the car.
Described 2 groups of swaying speed reduction markings are arranged at vehicle and sail direction and distance RSU aerial radiation volume edges M rice, wherein, and M ≈ v
h* T
p, T
pfor the data processing cycle of data processing module, v
hfor in freeway net, highest line sails the speed of a motor vehicle.
Described bidirectional active compound visa card comprises wireless communication unit, vibration transducer and data processing module;
Described vibration transducer is used for collection vehicle vibration data;
Described data processing module triggers the adaptive threshold of wireless communication unit for calculating;
Described wireless communication unit is for launching id information and receive/sending answer signal.
Tackle the interactive communication method of the ambiguity path radio-frequency recognition system of artificial electromagnetic screen, comprise the following steps:
Step 1, first wireless communication module of RSU launches broadcast singal, by the bidirectional active compound visa card record path information of its coverage, under non-masked state, bidirectional active compound visa card can receive RSU broadcast singal, the data processing module of bidirectional active compound visa card judges whether there is duplicate paths information simultaneously, if do not have, then writes;
Step 2, after bidirectional active compound visa card enters freeway net, vibration transducer starts image data, utilize the median filter in data processing module to carry out filtering to the vibration data recorded in the data processing cycle of data processing module, the maximal value of filtering after vibration data is set as that next cycle judges to enter the threshold value of RSU coverage;
Step 3, if the vibration data in current data treatment cycle has the threshold value being more than or equal to 2 values and exceeding a cycle set, then triggers the id information that wireless communication unit sends bidirectional active compound visa card;
Step 4, second wireless communication module of RSU receives id information, sends the answer signal that modulation has RSU routing information;
Step 5, if bidirectional active compound visa card is not electromagnetically shielded by the grounding wire, then can receive the answer signal that RSU sends, data processing module judges whether there is duplicate paths information in card, if without duplicate paths information, write paths information, sends the answer signal having received routing information simultaneously to RSU;
Step 6, if RSU does not receive the answer signal of bidirectional active compound visa card in 1s, then judges that this card is electromagnetically shielded by the grounding wire;
Step 7, the id information of conductively-closed bidirectional active compound visa card is sent to host computer by wire communication module by RSU, and this id information pipes off by host computer;
Step 8, before vehicle of weighing rolls highway away from, charge station staff reads bidirectional active compound visa card information, if corresponding ID is piped off by 2 times, is then judged to be artificial deliberately electromagnetic screen.
In described step 2, vibration transducer sails into after freeway toll station entrance gets visa card at vehicle, start to carry out vibrating data collection, frequency acquisition is determined according to the width of swaying speed reduction marking protrusions and vehicle max. speed in freeway net of weighing.
In described step 2, vibration transducer frequency acquisition is f
s, f
s>=v
h/ w, wherein, w is the width of swaying speed reduction marking protrusions, v
hfor the max. speed of vehicle of weighing in highway network.
According to Current vehicle travel speed self-adaptative adjustment threshold value, every T
pupgrade a subthreshold, T
pfor the data processing cycle of data processing module, T
p≈ L/v
l, wherein, L often organizes swaying speed reduction marking coverage, v
lfor the average minimum speed of operation of vehicle in freeway net of weighing.
Send in described step 4 is adopt with point-to-point communication pattern.
Compared with prior art, the beneficial effect that the present invention has: the present invention is by arranging multiple RSU, and active bi-directional compound visa card provided by symmetrical heavy cargo car; Receive the id information of active bi-directional compound visa card transmitting according to RSU after, launch RSU answer signal, if active bi-directional compound visa card is not in external shield state, after receiving RSU answer signal, then launch answer signal to RSU and represent and receive RSU routing information; If RSU does not receive the answer signal that active bi-directional compound visa card second time is launched, then represent that active bi-directional compound visa card is in external shield state; RSU receives the answer signal that compound visa card second time is launched, then represent that active bi-directional compound visa card is in non-masked state, achieve the identification to artificial electromagnetic screen.
Wireless communication unit in active compound visa card in the ambiguity path radio-frequency identification method of the artificial deliberately electromagnetic screen of reply provided by the present invention comprises radio broadcasting signal monitoring modular, after entering RSU broadcast singal overlay area, under the condition be not electromagnetically shielded by the grounding wire, after radio broadcasting signal monitoring module monitors to RSU broadcast singal, can trigger wireless communication unit equally, wireless communication unit can improve the robustness of ambiguity path radio-frequency (RF) identification.
The ambiguity path radio-frequency identification method of the artificial deliberately electromagnetic screen of reply provided by the present invention can at bidirectional active compound visa card by artificial deliberately electromagnetic screen situation, under utilizing the unearthed condition of shield, shield internal electric field can affect this characteristic of external electrical field, after initiatively launching id information by compound visa card, whether RSU receives second time answer signal as the foundation judging masked state, then utilize RSU wire transmission module that this id information is uploaded to data center, as the charge foundation of charge station's outlet.In addition, by arranging the vibration signal that swaying speed reduction marking produces at RSU range of receiving edge, trigger the wireless transmission unit of compound visa card, realize reducing compound visa card power consumption.The present invention can under compound visa card be in electromagnetic screen state, trigger the information that RSU records compound visa card, include but not limited to No. ID, license board information etc., built-in vibration transducer also can be utilized to reduce compound visa card to transmit number of times, thus save power.
Accompanying drawing explanation
In the ambiguity path identifying system that Fig. 1 provides for embodiment of the present invention, RSU range of receiving edge arranges swaying speed reduction marking schematic diagram.
Fig. 2 is RSU structured flowchart in the present invention.
Fig. 3 is the structured flowchart of bidirectional active compound visa card in the present invention.
Fig. 4 is the process flow diagram of RSU in the present invention.
Fig. 5 is the process flow diagram of embodiment of the present invention.
In figure, 1 is the first wireless communication module, and 2 is the second wireless communication module, and 3 is wire communication module, 4 is swaying speed reduction marking, 5 is wireless communication unit, and 6 is vibration transducer, and 7 is data processing module, 8 is radio broadcasting signal monitoring modular, 9 is median filter, and 10 is RSU, and 11 is RSU aerial radiation scope.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is described in detail.
With reference to figure 1, Fig. 2 and Fig. 3, a kind of ambiguity path radio-frequency recognition system of tackling artificial electromagnetic screen provided by the invention, it is applicable to highway tolling system, especially the cheating of the artificial deliberately shielding compound visa card for the purpose of fee evasion can be tackled, so that provide reliable routing information foundation for highway tolling system by the fractionation of the charge of actual travel path and toll.
The ambiguity path radio-frequency recognition system of tackling artificial electromagnetic screen comprises multiple RSU10, each travels the corresponding compound visa card of vehicle in road network, consider Cost Problems, wherein only active bi-directional compound visa card provided by symmetrical heavy cargo car, because it has relatively large fee evasion motivation, conventional unidirectional compound visa card provided by other vehicles.
In the present invention, described RSU is used for sending/receiving, modulating/demodulating, coding/decoding, encrypt/decrypt have and carry out data processing function to launch and accept and to upper machine data storehouse photos and sending messages.
In the present invention, described bidirectional active compound visa card is used for sending/receiving, modulating/demodulating, coding/decoding, encrypt/decrypt, involving vibrations sensor, and carries out data processing to vibration data.Bidirectional active compound visa card is triggered by the vibration that vibration speed reduction marking produces by vehicle, at visa card by under artificial electromagnetic screen condition, according to electric field external shield principle, RSU10 will receive the id information of bidirectional active compound visa card transmission, but whether visa card cannot receive RSU and send information, whether can receive response message determination visa card shield according to RSU.
Fig. 2 is the circuit structure block diagram of RSU of the present invention.See Fig. 1 and Fig. 2, in the present invention, described RSU is comprised the first wireless communication module 1, second wireless communication module 2, wire communication module 3 and weighs vehicle at the 2 groups of swaying speed reduction markings 4 being produced the wireless communication unit vibrated to trigger bidirectional active compound visa card by RSU front of the car for making; 2 groups of swaying speed reduction markings are arranged at RSU aerial radiation scope 11 (oval shade) edge (edge that distance vehicle is nearest) and sail M rice on direction (distance that namely 2 groups of swaying speed reduction markings and RSU aerial radiation scope sail the edge on direction at vehicle is M) at vehicle, and wherein M depends on the data processing cycle T of data processing module
pand highest line sails speed of a motor vehicle v in freeway net
h, i.e. M ≈ v
h* T
p, such as, to ensure that, under the fastest travel speed condition of vehicle, in a data processing cycle, the wireless communication unit of bidirectional active compound visa card can be waken up, data processing cycle T
p=3.2 seconds, v
h=34 meter per seconds, then M ≈ 109 meters.Often organize graticule to install according to national GB5768 standard, require often to organize in graticule to be no less than 10 projections.2 groups of vibration speed reduction markings vehicle that is used for making weighing is producing vibration to trigger described bidirectional active compound visa card by RSU front of the car.
Described first wireless communication module 1 has the broadcast singal of RSU routing information for launching modulation, sensor circuit module in bidirectional active compound visa card is connected with wireless communication unit 5, the excitation receiving broadcast singal produces induction current, the routing information of induction current trigger data memory module record RSU.
Described second wireless communication module 2 is for receiving the id information of bidirectional active compound visa card, send answer signal and receive bidirectional active compound visa card send second time answer signal, visa card id information, under do not receive wire communication module second time answer signal situation at RSU, is sent to host computer database and pipes off by described wire communication module 3.
Fig. 3 is the circuit structure block diagram of bidirectional active compound visa card of the present invention, see Fig. 3, in the present invention, described bidirectional active compound visa card comprises wireless communication unit 5, vibration transducer 6 and data processing module 7 etc., described vibration transducer 6 is for collection vehicle vibration data, described data processing module 7 triggers the adaptive threshold of wireless communication unit for calculating, for removing the value filter of vibration mutation disturbance and noise component during described data processing module 7 comprises, median filter 9 is every T
pvibration mutation disturbance and noise component are removed to the vibration data filtering collected, the maximal value that data processing module obtains filtering after vibration data launches id information in a broadcast mode as the threshold value of the wireless transmission unit triggering described bidirectional active compound visa card, the Oscillation Amplitude caused by described vibration graticule due to different travel speed is different, described every T
pupgrade threshold operation to be used for, according to current driving speed adaptive adjustment threshold value, avoiding Lou sending and frequently sending the electric quantity consumption caused.When the vibration data collected is greater than described setting threshold value, trigger described bidirectional active compound visa card wireless transmission unit and launch id information, the working time is according to laterally shaking the distance M at graticule setting position and RSU radiation edge and the average minimum speed of operation v of vehicle in freeway net that weigh when blocking up
ldetermine, to guarantee that, under vehicle travels minimum speed of a motor vehicle condition, wake-up states can be retained to and enter RSU radiation scope, such as M is 109 meters, v
lbe 1.5 meter per seconds, then the working time reference settings of each wake on wireless transmission unit is greater than 73s.2 groups of vibration speed reduction markings are producing vibration with the wireless communication unit triggering described bidirectional active compound visa card for the vehicle that makes to weigh by RSU front of the car.
Described wireless communication unit 5 for launching, modulation id information receiving/send answer signal, wireless communication unit 5 comprises RSU radio broadcasting signal monitoring modular 8, after entering RSU broadcast singal overlay area, under the condition be not electromagnetically shielded by the grounding wire, after radio broadcasting signal monitoring modular 8 monitors RSU broadcast singal, wireless communication unit can be triggered equally, to improve system robustness.
When described active bi-directional compound visa card to be placed in airtight shield in situation, shield is in unearthed situation, theoretical based on Classical Electromagnetic Field, described compound visa card is in external electric field masked state, external electrical field cannot affect the electric field in shield, and namely compound visa card cannot receive the broadcast singal that RSU first wireless communication module is launched.But outside under electric field shielding condition, shield internal electric field can produce induced charge at shield outside surface, then affects external electrical field.
For the judgement of masked state, after described RSU second wireless communication module receives the id information of active bi-directional compound visa card transmitting, launch the routing information that RSU answer signal comprises RSU, if compound visa card is not in external shield state, after receiving RSU answer signal, then launch answer signal to RSU and represent and receive RSU routing information.If RSU does not receive the answer signal that compound visa card second time is launched, then represent that compound visa card is in external shield state.
After RSU receives the id information of compound visa card first time transmitting, if do not receive secondary answer signal, then judge that active bi-directional compound visa card is in external electric field masked state, this id information is uploaded to data center by above-mentioned wire transmission module, and piped off by this id information, and counting adds 1.
Wherein, described data processing module comprises median filter 9, and described median filter 9 is every T
p(T
pdata processing cycle for data processing module) vibration mutation disturbance and noise component are removed to the vibration data filtering collected, the maximal value that described data processing module obtains filtering after vibration data launches id information in a broadcast mode as the threshold value of the wireless transmission unit triggering described bidirectional active compound visa card, the Oscillation Amplitude caused by described vibration graticule due to different travel speed is different, described every T
pupgrade threshold operation to be used for, according to current driving speed adaptive adjustment threshold value, avoiding Lou sending and frequently sending the electric quantity consumption caused.When the vibration data collected is greater than described setting threshold value, trigger described bidirectional active compound visa card wireless transmission unit and launch id information, the working time is for determine according to RSU range of receiving.
Fig. 4 is the process flow diagram of RSU provided by the present invention, and it is applied to the communication mode of RSU and compound visa card in ambiguity path identifying system, and judges whether visa card is electromagnetically shielded by the grounding wire according to response message.See Fig. 4 and Fig. 5, the interactive communication method tackling the ambiguity path radio-frequency recognition system of artificial electromagnetic screen comprises the following steps:
Step 1, first wireless communication module of RSU launches broadcast singal, by unidirectional compound visa card, the two-way compound visa card record path information of its coverage, under non-masked state, bidirectional active compound visa card can receive RSU broadcast singal, the data processing mould 7 of bidirectional active compound visa card judges whether there is duplicate paths information simultaneously, if do not have, then writes.If there is duplicate paths information then not record, duplicate paths information may be write after being triggered by vibration transducer.
Step 2, after bidirectional active compound visa card enters freeway net, vibration transducer 6 starts image data, vibration transducer 6 sails into after freeway toll station entrance gets visa card at vehicle, start to carry out vibrating data collection, frequency acquisition is determined according to the width of vibration speed reduction marking and vehicle maximum travel speed in freeway network.In the present invention, the setting of frequency acquisition is determined according to often organizing max. speed in the width of swaying speed reduction marking protrusions and vehicle freeway net of weighing, all can be collected to make driving through each protruding vibration produced by vehicle, make ledge width be w, the max. speed of vehicle of weighing in highway network is v
h, so frequency acquisition f
s(unit Hz) should meet f
s>=v
h/ w.Such as swaying graticule ledge width is 25 centimetres, and vehicle maximum travel speed is 34 meter per seconds, and so collection period is at least 136Hz.The data processing cycle of data processing module, according to often organizing the coverage of swaying graticule and minimum speed of a motor vehicle when blocking up is determined, under making different speed of a motor vehicle condition, completely can collect all vibration datas that vibration graticule produces in one-period.It is L that swaying speed reduction marking coverage is often organized in order, and the minimum speed of a motor vehicle of vehicle of weighing is v
l, the data processing cycle T of data processing module
pt should be met
p≈ L/v
l.Such as often group vibration speed reduction marking internal projection width is 25 centimetres, adjacent protrusion spacing 20 centimetres, comprises 11 projections altogether, then coverage is 11*0.25+10*0.2=4.75 rice, the minimum speed of a motor vehicle is set as 1.5 meter per seconds, then the treatment cycle of data processing module can be set as 3.2s.The impact that the catastrophic vibration data introduced to remove accidentalia set threshold value, data processing module will to data processing cycle T
pthe vibration data of interior record utilizes median filter 9 to carry out filtering, and the maximal value of filtering after vibration data is set as that next cycle judges to enter the threshold value of RSU coverage.Continuous adjustment threshold value is that the vibration in order to automatically adapt to be produced by identical barrier under different speed of a motor vehicle condition is different, and each data processing cycle upgrades a subthreshold.
Step 3, the vibration data in current data treatment cycle has the threshold value being more than or equal to 2 values and exceeding a cycle set, then trigger the id information that wireless communication unit sends bidirectional active compound visa card.
Step 4, second wireless communication module of RSU receives id information, sends with point-to-point communication pattern the answer signal that modulation has RSU routing information.
Step 5, if bidirectional active compound visa card is not electromagnetically shielded by the grounding wire, then can receive the answer signal that RSU sends, data processing module 7 judges whether there is duplicate paths information in card, if without duplicate paths information, write paths information, sends the answer signal having received routing information simultaneously to RSU.
Step 6, if RSU does not receive the answer signal of bidirectional active compound visa card in 1s, then judges that this card is electromagnetically shielded by the grounding wire.
Step 7, the id information of conductively-closed bidirectional active compound visa card is sent to host computer database by wire communication module 3 by RSU, and this id information pipes off by host computer, and counting adds 1.
Step 8, before vehicle of weighing rolls highway away from, charge station staff reads bidirectional active compound visa card information, if corresponding ID is piped off by 2 times, is then judged to be artificial deliberately electromagnetic screen visa card, punishes according to relevant regulations.
The ambiguity path radio-frequency identification method of the artificial deliberately electromagnetic screen of reply provided by the present invention can at bidirectional active compound visa card by artificial deliberately electromagnetic screen situation, under utilizing the unearthed condition of shield, shield internal electric field can affect this characteristic of external electrical field, after initiatively launching id information by compound visa card, whether RSU receives second time answer signal as the foundation judging masked state, then utilize RSU wire transmission module that this id information is uploaded to data center, as the charge foundation of charge station's outlet.In addition, by arranging the vibration signal that swaying speed reduction marking produces at RSU range of receiving edge, trigger the wireless transmission unit of compound visa card, realize reducing compound visa card power consumption, save power.
The present invention can under compound visa card be in electromagnetic screen state, trigger the information that RSU records compound visa card, include but not limited to No. ID, license board information etc., built-in vibration transducer also can be utilized to reduce compound visa card to transmit number of times, thus save power.
Claims (9)
1. tackle the ambiguity path radio-frequency recognition system of artificial electromagnetic screen, it is characterized in that, comprise multiple RSU, active bi-directional compound visa card provided by symmetrical heavy cargo car; Receive the id information of active bi-directional compound visa card transmitting according to RSU after, launch RSU answer signal, if active bi-directional compound visa card is not in external shield state, after receiving RSU answer signal, then launch answer signal to RSU and represent and receive RSU routing information; If RSU does not receive the answer signal that active bi-directional compound visa card second time is launched, then represent that active bi-directional compound visa card is in external shield state; RSU receives the answer signal that compound visa card second time is launched, then represent that active bi-directional compound visa card is in non-masked state.
2. the ambiguity path radio-frequency recognition system of the artificial electromagnetic screen of reply according to claim 1, it is characterized in that, described RSU comprises the first wireless communication module (1), the second wireless communication module (2), wire communication module (3) and 2 groups of swaying speed reduction markings (4);
Described first wireless communication module (1) has the broadcast singal of RSU routing information for launching modulation;
Described second wireless communication module (2) for receiving the id information of bidirectional active compound visa card, send answer signal and receive bidirectional active compound visa card send second time answer signal;
Bidirectional active compound visa card id information, under do not receive wire communication module second time answer signal situation at RSU, is sent to host computer database by described wire communication module (3);
Described 2 groups of swaying speed reduction markings (4) are producing vibration to trigger bidirectional active compound visa card for the vehicle that makes to weigh by RSU front of the car.
3. the ambiguity path radio-frequency recognition system of the artificial electromagnetic screen of reply according to claim 2, it is characterized in that, described 2 groups of swaying speed reduction markings (4) are arranged at vehicle and sail direction and distance RSU aerial radiation volume edges M rice, wherein, and M ≈ v
h* T
p, T
pfor the data processing cycle of data processing module, v
hfor in freeway net, highest line sails the speed of a motor vehicle.
4. the ambiguity path radio-frequency recognition system of the artificial electromagnetic screen of reply according to claim 1, it is characterized in that, described bidirectional active compound visa card comprises wireless communication unit (5), vibration transducer (6) and data processing module (7);
Described vibration transducer (6) is for collection vehicle vibration data;
Described data processing module (7) triggers the adaptive threshold of wireless communication unit for calculating;
Described wireless communication unit (5) is for launching id information and receive/sending answer signal.
5. tackle the interactive communication method of the ambiguity path radio-frequency recognition system of artificial electromagnetic screen, it is characterized in that, comprise the following steps:
Step 1, first wireless communication module of RSU launches broadcast singal, by the bidirectional active compound visa card record path information of its coverage, under non-masked state, bidirectional active compound visa card can receive RSU broadcast singal, the data processing module of bidirectional active compound visa card judges whether there is duplicate paths information simultaneously, if do not have, then writes;
Step 2, after bidirectional active compound visa card enters freeway net, vibration transducer starts image data, utilize the median filter in data processing module to carry out filtering to the vibration data recorded in the data processing cycle of data processing module, the maximal value of filtering after vibration data is set as that next cycle judges to enter the threshold value of RSU coverage;
Step 3, if the vibration data in current data treatment cycle has the threshold value being more than or equal to 2 values and exceeding a cycle set, then triggers the id information that wireless communication unit sends bidirectional active compound visa card;
Step 4, second wireless communication module of RSU receives id information, sends the answer signal that modulation has RSU routing information;
Step 5, if bidirectional active compound visa card is not electromagnetically shielded by the grounding wire, then can receive the answer signal that RSU sends, data processing module judges whether there is duplicate paths information in card, if without duplicate paths information, write paths information, sends the answer signal having received routing information simultaneously to RSU;
Step 6, if RSU does not receive the answer signal of bidirectional active compound visa card in 1s, then judges that this card is electromagnetically shielded by the grounding wire;
Step 7, the id information of conductively-closed bidirectional active compound visa card is sent to host computer by wire communication module by RSU, and this id information pipes off by host computer;
Step 8, before vehicle of weighing rolls highway away from, charge station staff reads bidirectional active compound visa card information, if corresponding ID is piped off by 2 times, is then judged to be artificial deliberately electromagnetic screen.
6. the interactive communication method of the ambiguity path radio-frequency recognition system of the artificial electromagnetic screen of reply according to claim 5, it is characterized in that, in described step 2, vibration transducer sails into after freeway toll station entrance gets visa card at vehicle, start to carry out vibrating data collection, frequency acquisition is determined according to the width of swaying speed reduction marking protrusions and vehicle max. speed in freeway net of weighing.
7. the interactive communication method of the ambiguity path radio-frequency recognition system of the artificial electromagnetic screen of reply according to claim 6, is characterized in that, in described step 2, vibration transducer frequency acquisition is f
s, f
s>=v
h/ w, wherein, w is the width of swaying speed reduction marking protrusions, v
hfor the max. speed of vehicle of weighing in highway network.
8. the interactive communication method of the ambiguity path radio-frequency recognition system of the artificial electromagnetic screen of reply according to claim 5, is characterized in that, according to Current vehicle travel speed self-adaptative adjustment threshold value, every T
pupgrade a subthreshold, T
pfor the data processing cycle of data processing module, T
p≈ L/v
l, wherein, L often organizes swaying speed reduction marking coverage, v
lfor the average minimum speed of operation of vehicle in freeway net of weighing.
9. the interactive communication method of the ambiguity path radio-frequency recognition system of the artificial electromagnetic screen of reply according to claim 5, is characterized in that, sending in described step 4 is adopt with point-to-point communication pattern.
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