CN101866499A - Electronic tag accurate identification method for non-stopping toll administration - Google Patents
Electronic tag accurate identification method for non-stopping toll administration Download PDFInfo
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- CN101866499A CN101866499A CN200910058927A CN200910058927A CN101866499A CN 101866499 A CN101866499 A CN 101866499A CN 200910058927 A CN200910058927 A CN 200910058927A CN 200910058927 A CN200910058927 A CN 200910058927A CN 101866499 A CN101866499 A CN 101866499A
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Abstract
The invention discloses an electronic tag accurate identification method for non-stopping toll administration, which comprises the following steps of: using a sensor activation device arranged on a driveway to start an electronic tag reader-writer which is connected with the sensor activation device and is positioned in a limited distance range at the moment when a vehicle passes by and generates a triggering signal; using a directional antenna and the measures such as signal shielding and the like to limit the communication between the reader-writer and an approaching on-vehicle electronic tag in a set time range and a small distance range to ensure that the interference from other uncorrelated signals to the communication between the reader-writer and the approaching on-vehicle electronic tag in the same driveway is the minimum; besides, clearly differentiating the on-vehicle electronic tags in different driveways and the on-vehicle electronic tags of a preceding vehicle and a following vehicle in the same driveway by using the error rate (packet loss rate) differences which are generated between the electronic tag of an adjacent driveway and an on-vehicle electronic tag approaching a localizer and between an on-vehicle electronic tag of a following vehicle in the same driveway and the on-vehicle electronic tag approaching the localizer during the communication with a localizer.
Description
Technical field
The present invention relates to long-range radio-frequency identification, non-stopping toll administration and general entrance guard management.
Background technology
The existing REID that is used for vehicle management, comprise remote passive RFID radio-frequency recognition system, with two kinds of active RFID radio-frequency recognition systems, passive electronic label relies on the energy from the reading and writing device antenna emission to come work, thereby the distance of read-write identification is very limited, in order to increase the read-write decipherment distance, read write line often needs to use gain directional antenna, come work with big emissive power, this has not only increased the cost of read-write system greatly, and big radio-frequency power also can bring injury and produce the situation of misreading to health.In addition, the passive electronic label read-write system, under the situation of the electronic tag installation site being carried out strict restriction, its reliable read write distance also can only reach 5-8 rice, and Vehicle Speed must be limited in certain scope toward contact, for example 30 kilometers/hour, to guarantee between read write line and the electronic tag enough call duration times being arranged, this also just reduces the service efficiency of highway certainly.The energy that active electronic label then relies on self institute's charged pool comes work, though its reading/writing distance can reach more than 100 meters, except more serious misreading the problem, also has how to prolong the electronic tag battery problem in serviceable life.
Existing highway non-parking charge passage, or other non-stop gate management, no matter adopt the recognition method of passive or active RFID, all exist and how accurately discern the received vehicle radio frequency ID (identity number) of read write line, it is the actual testing vehicle register that should handle number, rather than adjacent track vehicle, or the signal of sending with other pursuit-type vehicle vehicle electronics labels of track, to avoid causing the problem of misreading.Come the restricting signal transmission direction although can use methods such as directional antenna, but because the propagation characteristic of radiofrequency signal itself, the multipath reflection of signal for example, and there is a unstable region etc. in the reception of radiofrequency signal, thereby, be difficult to prevent the generation that stop signal is misread only by the range of receiving of control signal.
Summary of the invention
Technical matters to be solved by this invention, be exactly in existing general non-stopping toll administration and the general entrance guard management, existence is from the signal interference problem of adjacent track vehicle and pursuit-type vehicle vehicle electronics label, provide a kind of eliminating signal to disturb, realize accurately differentiating and the straightforward procedure of discerning different vehicle electronics labels, thereby created condition for low cost realizes non-stopping toll administration highly reliably.
Form structure:
Technical solution of the present invention comprises vehicle-mounted active electronic label (being called for short electronic tag later on), activator appliance, and several parts of electronic label read/write are formed.(referring to Fig. 1).
Electronic tag
It is made by single-chip micropower transceiver, and it carries with car, and a unified fixed position that is installed in vehicle, the side angle before generally being installed in the vehicle window.Except that self ID, it also stores other required information of toll administration.Electronic tag in the system of the present invention, the active electronic label of outwards launching self ID number with general only single timing is different, it can be at any time according to the instruction from read write line, change the working method that self comprises the radio frequency operation feature, and entrained information, it is a kind of interactive intelligent electronic tag.Employed all electronic tags in the native system should have the physical performance index of basically identical, comprise emissive power and receiving sensitivity etc.
Activator appliance
Activator appliance is mounted in the non-parking charge station, or a sensor device at each place, fixed position, track is imported and exported in entrance guard management, for example ground induction coil or infrared eye, it is mainly used in the moment in the vehicle process, produce a trigger pip, start with this and be attached thereto the read write line that connects, the duty that enters the short time immediately, to reach the entrained electronic tag of vehicle that control has just triggered sensor device, with time and position with signal communication between the corresponding read write line in track.
Read write line
Read write line is exactly a micropower transceiver that can communicate with electronic tag, has the performance of quick change self radio frequency operation feature.Read write line is divided into again and the direct-connected locating read-write device of activator appliance (being called for short steady arm from now on) according to its function difference, and two kinds of read write lines (being called for short communication equipment from now on) that directly is connected with computing machine.The working method of steady arm also has two kinds, and a kind of is one behind the signal that receives from activator appliance, just by predefined working method, transmits to the electronic tag that approaches immediately; Another kind of then be behind a signal that receives from activator appliance, begin to receive the signal that the vehicle electronics label that approaches is sent immediately, and pass to and be attached thereto the computing machine that connects and handle.The time span of received signal preestablishes, and is generally the vehicle of passing through and crosses the required time of 3-5 rice distance, enters dormant state then, or after carrying out next step action according to computer instruction, enters dormant state again, up to be activated (referring to Fig. 2) next time.In order to reduce interference to adjacent track vehicle and pursuit-type vehicle vehicle electronics label, or from the interference of adjacent track vehicle and pursuit-type vehicle vehicle electronics label signal, steady arm generally has the send a car directional antenna of vehicle electronics tag orientation of a sensing, also can install one in case of necessity and can increase a simple mechanism of isolating, for example metal baffle (referring to Fig. 3) with the adjacent lane radiofrequency signal.Steady arm is installed in apart from the position with track activator appliance certain distance garage the place ahead, this position will make steady arm receive activation signal and start moment of work, with approach vehicle vehicle electronics tag just distance about 3-5 rice arranged, this distance also is steady arm or the vehicle electronics label on the same track, when using the minimum signal emissive power work of setting, reliable communication distance each other.The same with electronic tag, the employed steady arm in the different tracks of native system should have the physical performance index of basically identical.And communication equipment is mainly used in electronic tag and carries out information interchange, for example read to comprise electronic tag ID number and the information of car Taoist monastic name, and to the electronic tag instruction that sends a message back.According to the difference of specific embodiments, steady arm and communication equipment also can unite two into one, thereby bear steady arm and two kinds of work of communication equipment simultaneously.
The system works principle:
In order accurately to differentiate and the signal of identification from different vehicle electronics labels, the moment that produces trigger pip when we utilize vehicle through activator appliance starts steady arm, make it carry out very communicating by letter of finite time with the vehicle electronics label that approaches, and the communication distance between them is limited in the limited range, in case of necessity also by the method for fixture signal baffle plate with further increase Signal Spacing is set, make communicating by letter between the steady arm and the vehicle electronics label that approaches in the same track, be difficult to interfere with the communication between adjacent track vehicle electronics label and the read write line, simultaneously also be difficult to be subjected to adjacent track vehicle electronics label and steady arm, and the signal of same track pursuit-type vehicle vehicle electronics label disturbs.In addition, we have also utilized signal intensity (for given signal receiver, under the same noise environmental baseline) and the bit error rate between concern, according in limited call duration time and limited communication range, be positioned at the electronic tag of adjacent lane, and pursuit-type vehicle vehicle electronics label in the same track, and approach between the vehicle electronics label of steady arm, when communicating with steady arm, because (this difference can be embodied on the signal packet sum that receives in preset time the difference of the bit error rate that difference caused (packet loss) of signal intensity, or receiving the aspects such as signal packet required time of giving determined number), to be positioned at the vehicle electronics label in different tracks, and the vehicle electronics label of same track preceding vehicle and pursuit-type vehicle separates.
Here, we are limited in an another one benefit in the short distance range with communication distance, when communication distance is very near, electronic tag and steady arm are because individual difference each other, possible inconsistent of minimum emissive power and receiving sensitivity for example can be very little to the difference that absolute communication distance between the two causes.Even because do not consider signal attenuation, under given noise circumstance condition, the signal intensity of decision communication distance and the relation of leaving the signal source distance, it also is a kind of inverse square relation, thereby, cause the difference of 2 rice grain pattern communication distances, for example communication distance is become 4 meters from 2 meters, or become 2 meters from 4 meters, need the individual difference of 6dB at least.And this idiosyncratic gap is with respect to adjacent lane vehicle and same track pursuit-type vehicle vehicle electronics label, and approach between the vehicle electronics label of steady arm, when communicating,, just become very limited because the difference of the signal intensity that Signal Spacing caused is compared with steady arm.
At last, in order to ensure in this limited call duration time and communication distance scope, steady arm and vehicle electronics label can be finished necessary information interchange, except using the minimum signal emissive power that in this qualification distance range, can realize communicating by letter, we have also used bigger signal transmission power to communicate, to guarantee under external interference and other reasons cause situation that communication quality descends, can both to realize reliable communication.We suppose that external interference all is identical to all relevant vehicle electronics labels, has promptly reduced the communication distance of given emissive power.That is to say when using original minimum power emission, it is unreliable that communication has between the two become, at this moment, and originally more high-grade emissive power, may just become between the vehicle electronics label and steady arm that can guarantee on the same track, realize the minimum emissive power of reliable communication.
Except need be with the vehicle electronics label in different tracks, and beyond the vehicle electronics label of same track preceding vehicle and pursuit-type vehicle differentiates, in non-parking charge and general vehicle entrance guard management, need not pay the fees vehicle and paid expense vehicle toward contact, up vehicle and descending vehicle, enter the station vehicle and departures vehicle, the vehicle electronics label difference of the enter vehicle and the vehicle of going out is come.At this moment, we only need in the signal that the vehicle electronics label sends, with the numbering of originating station (entering the station) and just the numbering of a last website of process included just.For the vehicular traffic that does not set off through our station, we only need to change the numbering of a last website in the electronic tag into the our station numbering, for the vehicle electronics label of paying the fees departures or going out, then need all to change originating station and last station numbering into zero; And for the electronic tag that has just entered the station, originating station numbering and last station numbering all are similarly the our station numbering.For this reason, position in each charge station, all needing to install remote-wireless charge station numbering writes machine and finishes this work, this writes machine and works by the mode of continuous broadcast transmission signal, need not change the low power sleep mode of vehicular traffic vehicle electronics label, just can finish this work.(referring to Fig. 4)
Concrete technical scheme
In a fixed position of each car, an electronic tag is installed in the lower left corner in for example preceding vehicle window, and the ID of electronic tag number corresponding one by one or identical with vehicle number.Store the required information of non-stopping toll administration in the electronic tag.Electronic tag uses battery-operated, also can use other power drives.For using battery-driven electronic tag, in order to prolong the serviceable life of electronic tag battery, electronic tag often is in the sleep state of low-power consumption before entering charge station.For example, electronic tag periodically uses f
1Channel, monitoring reception wake the state of the wake-up signal of machine before from charge station up.For this reason, the electronic tag Rouser is installed in the appropriate location that we need be before vehicle enters charge station, and uses f
1Channel is broadcasted wake-up signal continuously, so that the vehicle electronics label can be in a kind of duty after entering charge station, for example uses f
2The channel monitoring reception is from the state of fixture signal.Certainly, before vehicle entered charge station, electronic tag also can use other low-power consumption sleep mode and wake mode accordingly up, for example uses the high power low-frequency signal to wake up, re-uses the mode of high-frequency signal work.
Secondly, in each track inflow point of charge station, a ground induction coil or other sensor device are installed as activator appliance, and leaving left side, track, activator appliance garage the place ahead (side corresponding) with the electronic tag position, and in the suitable appropriate position of vehicle electronics label setting height(from bottom), a steady arm is installed, make steady arm after receiving the activation signal of activator appliance, start the moment of work, vehicle electronics label or steady arm are when using the minimum signal emissive power work of setting, reliable communication distance each other is just in time in the scope of 3-5 rice, this distance also is when passing through with 60 kilometers/hour speed for the vehicle that guarantees to pass through, between vehicle electronics label and the read write line, there are enough call duration times to finish necessary information and exchange required distance.Steady arm directly links to each other with activator appliance.In order to make the radio communication between the vehicle electronics label and steady arm in the same track as far as possible, communicating by letter between the vehicle electronics label that can not interfere with adjacent track and the steady arm, steady arm should adopt directional antenna, also can take some simple Signal Spacing measures in case of necessity, a metal baffle for example is installed, to increase the Signal Spacing between the different tracks at the localizer antenna place.
In addition, a communication equipment is installed in the appropriate location above in charge station, receives from the vehicle electronics label to send, and comprises the pay imformation of self ID number and place lane number.For fear of possible interference, electronic tag with wake device up, when communicating by letter between steady arm and the communication equipment, should use different communication channel (referring to Fig. 1).In the time must using same channel to launch and signal collision may be had, also need to adopt the mode of launching or delaying time and launch again after monitoring earlier.
After vehicle enters the charge station track during through activator appliance, the vehicle device that will trigger the activation makes it produce a trigger pip, this trigger pip will be passed to steady arm immediately, steady arm enters duty immediately once receiving this trigger pip, for example use one or more emissive powers (being generally 3) from small to large, send the signal packet of some to same track direction to the car, for example, 20 signal packet that add up to 60 of every kind of power emission, the lane number information that should include this steady arm place in the signal of emission, promptly quit work after having launched, till the new activation signal that receives next car generation.After electronic tag receives signal packet number from same steady arm and reaches predefined value, for example 40, with immediately with bigger emissive power and another one working channel f
3, send the charge information comprise self ID number and place lane number (from fixture signal) to communication equipment.To wait for the receipt signal of received communication machine after the emission, comprise the instruction of change vehicle electronics label mode of operation and charge record in the receipt signal.If can not receive the receipt signal in the given time, electronic tag will be retransmitted.After receiving the receipt signal, electronic tag will be according to the instruction in the acknowledgement information, changes self working mode, and the content of relevant charge record, working channel for example, sleep wake-up period, turnover station record etc.If an electronic tag is from receiving first signal packet, can not be in steady arm have been launched time of all signal packet at every turn (for example 60ms), receive the signal packet number of this setting from same steady arm accumulative total, illustrate that this electronic tag can only be to be in adjacent lane, or the vehicle electronics label on the pursuit-type vehicle, these invalid informations also all will be eliminated immediately, and electronic tag will restart to write down new information.
Although we only need to use a little power to transmit, just can the electronic tag in different tracks will be positioned at completely effectively, and the difference of the electronic tag of same track preceding vehicle and pursuit-type vehicle is come, here used several emissive powers that vary in size to transmit, rather than only rely on the reason that a little emissive power is come work, be in order to guarantee because environmental interference or other factor affecting, may cause steady arm or electronic tag when using minimum power to transmit, can not set up under the situation of efficient communication between the two, we just can utilize high one grade even high two grades signal transmission power, guarantee steady arm in the same track and the reliable communication between the electronic tag.At this moment, more high-grade signal transmission power just becomes the minimum emissive power that assurance realizes reliable communication between the two.
Need receive what signal packet as for the vehicle electronics label from steady arm at every turn, just send information to communication equipment, depend on that fully steady arm is when using the signal packet of several different capacity emission fixed qties, approach the vehicle electronics label of steady arm with the track, under any circumstance can both receive, comprise the minimum signal packet total number of several different transmission power.And the number of this setting should be slightly less than the number of this minimum signal packet.Someone worry adjacent lane can occur or pursuit-type vehicle vehicle electronics label receives, the peak signal bag total number that comprises several different transmission power, surpass the number of this setting and situation about transmitting to communication equipment, and actual conditions are: on the one hand, because 3 kinds of signal transmission powers that we use all are miniwatts, add and use the Signal Spacing measure that comprises directional antenna, this situation may take place hardly; On the other hand, even this situation occurs, the vehicle electronics label of adjacent lane and pursuit-type vehicle, receiving this required time of setting number signal packet, also will be far longer than the required time of vehicle electronics label that is approaching steady arm, because steady arm is when electronic tag transmits, what at first use is that minimum power transmits, and when using minimum emissive power to transmit, be positioned at the electronic tag and the pursuit-type vehicle vehicle electronics label in adjacent track, almost can not receive this signal, thereby, adjacent track and pursuit-type vehicle vehicle electronics label are the signal packet that impossible receive this number prior to this track electronic tag, at this moment, owing to received the information of a correct vehicle ID number and lane number with communication equipment, launched signal in the required time at steady arm, communication equipment not only will abandon the information with identical lane number, but also can be in the receipt signal of the electronic tag (adjacent lane vehicle or pursuit-type vehicle vehicle electronics label) of giving this information of transmission, adding requires this electronic tag to continue to use f
2The instruction of channel received signal receives the signal that they should receive in order to avoid influence them.
Here need to prove that state is that electronic tag enters and is in the state of monitoring reception from fixture signal after charge station is waken up here; Same reason, the duty after we also can allow electronic tag be waken up is the state that transmits, and steady arm will be in the monitoring reception state of short time conversely after being activated, receive the signal that sends from the electronic tag that is approaching.At this moment, we have only needed the adjustment that both concrete working methods is in addition suitable just.But utilize activator appliance to control call duration time and communication distance scope between electronic tag and the steady arm, and utilize between the vehicle electronics label in different tracks, between same track preceding vehicle and the pursuit-type vehicle vehicle electronics label, the huge difference of the bit error rate when communicating by letter with same steady arm (packet loss), the basic skills of differentiating and discern the vehicle electronics label that is in diverse location then is duplicate.
Description of drawings
Fig. 1 system works synoptic diagram of the present invention
The mode that Fig. 2 steady arm is launched after monitoring reception is adopted in the back that is activated again
Fig. 3 diverse location vehicle electronics label is in the difference that receives fixture signal
Fig. 4 enters the station by record and the vehicle of distinguishing different directions is numbered at a last station
Beneficial effect of the present invention
The present invention only utilizes generally cheaply active electronic label and read write line, in the situation that does not increase other any complex apparatus, solved simply and effectively present country in order to improve highway, gate inhibition's etc. vehicle pass-through efficient, strengthen toll administration, a difficult problem that runs in the non-stopping toll administration of wideling popularize. The present invention will greatly promote the promotion and implementation of non-stopping toll administration.
If reconstruct a non-parking charge station with existing general technology, not only need to spend the expense of units up to a million, but also the problem that exists neighboring trace vehicle and pursuit-type vehicle vehicle carried electronic label signal to disturb, and the high-power emission of read write line unhealthful etc. problem. And employing the technology of the present invention does not only need any change is done in existing track, and each lane equipment expense also only needs several thousand yuans, but also can remove above many worries from.
Concrete application scheme
Below our application scheme of weighing by not stopping and chargeing, the present invention is further specified:
We know that country is carrying out the goods stock on all highways, adopt the way of weight metering charging.According to the conventional method, weight metering charging is a job of wasting time and energy, and a large amount of vehicles adopts weight metering charging, will have influence on the traffic efficiency of the heavy vehicle of meter.Although the present domestic technology of not stopping and weighing, reached under running speed is no more than 60 kilometers/hour situation, accurately provide the level of the weight of the vehicle of passing through, but how accurately to distinguish vehicle from different tracks, and the radiofrequency signal of same track preceding vehicle and pursuit-type vehicle vehicle electronics label, remain a problem that waits to solve.
Utilize the present invention, we only need the lower left corner of vehicle window before each goods stock, and an electronic tag is installed, and this electronic tag has anti-disassembling device.Electronic tag is in periodic sleep before entering charge station, f is adopted in the back of reviving
1The flashy low power consumpting state of channel-monitoring, and wake up by waking device up in inflow point of charge station, it is in after entering charge station uses f
2The duty of channel monitoring reception signal.In each porch, track of charge station a weighing device is installed, and near weighing device an activator appliance is installed, activator appliance can be an infrared eye, also can be a ground induction coil, or other sensor devices.This activator appliance should be installed in the garage's anterior position near weighing device, so that after just having been finished Weighing by the vehicle of being weighed, will make activator appliance produce an activation signal, and start the steady arm in the place ahead.The installation site of steady arm should make it begin the moment that transmits after receiving activation signal as previously mentioned, and the distance of steady arm and vehicle electronics label is greatly about about 3-5 rice.Steady arm should be installed in the position with left side, track garage the place ahead, and setting height(from bottom) is a little more than the setting height(from bottom) of vehicle electronics label, with corresponding with the vehicle electronics label position.The directional antenna of steady arm should point to the position that direction to the car vehicle electronics label is installed.Steady arm is connected with activator appliance by cable.
After the goods transport vehicle process is weighed and is triggered sensor, the vehicle electronics label enter and steady arm between near field communication range, at this moment, the steady arm that is activated begins to the electronic tag that approaches, use 3 emissive powers (differing 5dBm between each emissive power) from small to large, emission has a plurality of signal packet of lane number, for example, and 20 signal packet of every kind of emissive power emission.Because close together, wireless communication rate can adopt higher baud rate, for example, and 115.2kbps.Use 60 signal packet of 3 kinds of different capacity emissions to take about 60ms, promptly enter dormant state after having launched, wait for next time and activating.
Select an appropriate number according to actual measurement or experience, for example 40, exceed with this number, one when electronic tag receives 40 signal packet after, just uses f immediately
3Channel and a bigger emissive power to the communication equipment that is connected with supervisory computer, send the packets of information comprise self ID number and vehicle place lane number.The size of electronic tag emissive power, the installation site of depending on communication equipment, communication equipment should be installed in and can allow the vehicle electronics label in each track, can both be than the place that is easier to carry out with it reliable communication, for example central authorities of charge station eminence is left the not far place of steady arm.
Electronic tag send pay the fees relevant information and receive the receipt signal that communication equipment beams back after, just will carry out corresponding action according to the instruction in the receipt signal.For example, enter the periodic sleep back of reviving and use f
1Monitor flashy low-power consumption dormant state, and revise the stored charge information of electronic tag etc.
ID number and lane number utilizing electronic tag to send, and the weight information of almost meanwhile being issued computing machine by this track weighing-appliance just can be easy to realize not stopped weight metering charging.
Claims (5)
1. the electronic tag accurate identification method that is used for non-stopping toll administration relates to following the most basic several hardware ingredient: electronic tag, activator appliance and comprise steady arm and the electronic label read/write of communication equipment; The present invention utilizes the method for vehicle through the moment startup steady arm of activator appliance generation trigger pip, controls call duration time and position between electronic tag and the steady arm; Utilize Signal Spacing measures and the method for using the low signal emissive power such as directional antenna, control the communication distance scope between electronic tag and the steady arm; Thereby the electronic tag and the steady arm of adjacent lane have greatly been reduced, and the electronic tag of pursuit-type vehicle, to the interference of communicating by letter between steady arm in the same track and the vehicle electronics label that approaches; In addition, the present invention has also utilized in limited call duration time and limited communication range, be positioned at the electronic tag of adjacent lane, and pursuit-type vehicle vehicle electronics label in the same track, and approach between the vehicle electronics label of steady arm, the difference of the bit error rate that produces when communicating with steady arm will be positioned at the vehicle electronics label in different tracks, and the vehicle electronics label signal of same track preceding vehicle and pursuit-type vehicle is clearly distinguished and come.
2. the electronic tag accurate identification method of non-stopping toll administration according to claim 1, it is characterized in that: in the inventive method, when steady arm receives enabling signal from activator appliance, steady arm has adopted and has transmitted, and corresponding vehicle electronics label has adopted and received from the working method that transmits to communication equipment again behind the signal of steady arm.
3. the electronic tag accurate identification method of non-stopping toll administration according to claim 1 and 2, it is characterized in that: in the methods of the invention, when electronic tag or corresponding steady arm when transmitting, several emissive powers that vary in size have been adopted, to guarantee the information interchange between electronic tag and the steady arm, the influence that not changed by other correlative factors.
4. according to claim 1, the electronic tag accurate identification method of 2 or 3 described non-stopping toll administrations, it is characterized in that: in the methods of the invention, the mutual interference mutually when communicating with the different communication object in order to reduce electronic tag, electronic tag has adopted the method for conversion communication channel.
5. according to claim 1,2, the electronic tag accurate identification method of 3 or 4 described non-stopping toll administrations, it is characterized in that: in the methods of the invention, for to turnover or pass by the vehicle of charge station, and the vehicle of having paid the fees and do not paid the fees distinguished, the present invention adopted in electronic tag the record start station and on one through the numbering of missing the stop, and when electronic tag is communicated by letter with related object, transmit this information, so that system discerns the electronic tag from different directions.
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