CN102024136A - Method and device for identifying vehicle orders - Google Patents

Abstract

The invention discloses a method for identifying vehicle orders. The method is implemented based on the dispatching of a low level reader protocol (LLRP) and comprises the following steps of: when a vehicle triggers a first coil, checking vehicles circularly; accumulating received signal strength indicator (RSSI) values of each vehicle in a checking result each time until the vehicle triggers a second coil; and determining the vehicle orders according to the magnitude orders of the accommodated values of the RSSI values of each vehicle. The invention also discloses a device for identifying the vehicle orders. By adopting the method and the device, the orders of the vehicles can be identified accurately when a plurality of the vehicles appear in an antenna coverage area at the same time.

Description

Method and device for recognizing vehicle sequence

Technical Field

The invention relates to a Radio Frequency Identification (RFID) technology, in particular to a method and a device for identifying a vehicle sequence.

Background

The Radio Frequency Identification (RFID) technology is a non-contact automatic Identification technology, which automatically identifies a target object through a Radio Frequency signal and obtains related data, the Identification work does not need manual intervention, and an RFID system comprises a reader and an electronic tag. With the development of RFID technology, the application range of the RFID technology is also wider, wherein one of the most important applications is Electronic Toll Collection (ETC).

In the application of the actual electronic toll collection system, the electronic tag is called an electronic license plate. The antenna of the ultrahigh frequency Reader can identify vehicle information of a high-speed intersection, and in the identifiable range of the antenna, if a plurality of vehicles enter the high-speed intersection in sequence at the same time, after the vehicles trigger the coil of the antenna, because the plurality of vehicles simultaneously appear in the coverage range of the antenna, the ultrahigh frequency Reader needs to operate the plurality of vehicles at the same time, at the moment, the ultrahigh frequency Reader can schedule one Reader Operation (RO) to perform checking Operation, and the checked vehicle deduction is released.

However, in the current application process, since a certain vehicle may be in a blind area that cannot be identified by the uhf reader when checking the vehicles, at this time, if the RO checks the following vehicle first, a situation that money is deducted from the checked following vehicle and the preceding vehicle is released occurs, that is, there is a defect that the sequence of the preceding vehicle and the following vehicle cannot be correctly identified in the existing application process, so that the serious result of wrong money deduction that the following vehicle is deducted and the preceding vehicle is released is caused.

Disclosure of Invention

In view of the above, the main objective of the present invention is to provide a method and an apparatus for identifying a vehicle sequence, which can correctly identify the vehicle sequence when multiple vehicles are simultaneously present in the coverage area of an antenna.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the invention provides a method for identifying a vehicle sequence, which comprises the following steps:

when the vehicle triggers a first coil, the vehicle is counted circularly, and the Received Signal Strength Indication (RSSI) value of each vehicle in each counting result is accumulated until the vehicle triggers a second coil;

and determining the vehicle sequence according to the magnitude sequence of the accumulated value of the RSSI value of each vehicle.

In the above scheme, the vehicles are counted circularly, and the RSSI value of each vehicle in each counting result is accumulated as follows:

running RO, and circularly counting;

judging whether the data of the vehicle in each counting result and the data in a matching template of the set Access Operation (AO) belong to the same region, further judging whether the obtained data of the vehicle can be matched with the data in the matching template of the AO after the data of the vehicle belong to the same region is determined, operating the AO after the data of the vehicle can be matched with the data in the matching template of the AO, calculating the identification (Key) value of each vehicle according to the unique identification of the read electronic license plate of the vehicle, adding 1 to the reading times in the corresponding node information according to the Key value of each vehicle, and accumulating the RSSI value.

In the above solution, before determining whether the data of the vehicle in the inventory result and the data in the set matching template of the AO belong to the same region, the method further includes:

and respectively comparing the RSSI value of each vehicle in the counting result with a set reading threshold value, and judging whether the data of the vehicle larger than the reading threshold value and the data in the set matching template of the AO belong to the same area.

In the above scheme, the method further comprises:

and after determining that the data do not belong to the same area, reading the data of the vehicle of the area to which the data in the matching template of the AO belong, and then further judging whether the obtained data of the vehicle can be matched with the data in the matching template of the AO.

In the above scheme, the determining the vehicle sequence according to the magnitude sequence of the accumulated value of the RSSI values of each vehicle is:

the accumulated values of the RSSI values of each vehicle are arranged in the descending order, and the vehicles with the large accumulated values of the RSSI values are arranged in the front.

In the above aspect, after determining the vehicle order, the method further includes:

and writing each vehicle according to the sequence of the vehicles, and opening the barrier after each writing is successful.

In the above scheme, the writing operation is performed on each vehicle according to the sequence of the vehicles, and after each writing is successful, the barrier gate is opened, and the method includes:

step a, the vehicle triggers a second coil, runs RO and carries out counting operation;

and b, judging whether the data in the checking result and the data in the set matching template of the AO belong to the same area, operating the AO after determining that the data belong to the same area, reading each vehicle according to the sequence of the vehicles, writing each vehicle after reading the unique identifier of the electronic license plate of the vehicle, and opening the barrier after writing successfully each time.

In the above solution, before determining whether the data in the counting result and the data in the set matching template of the AO belong to the same region, the method further includes:

and respectively comparing the RSSI value of each vehicle in the counting result with a set writing threshold value, and judging whether the data of the vehicle larger than the writing threshold value and the data in the set matching template of the AO belong to the same area.

In the above scheme, the method further comprises:

and e, restarting the counting operation for the vehicle with the failed writing operation, and then executing the step b.

In the above scheme, the method further comprises:

and after determining that the data do not belong to the same area, reading the data of the vehicle of the area to which the data in the matching template of the AO belong, and then further judging whether the obtained data of the vehicle can be matched with the data in the matching template of the AO.

The present invention also provides an apparatus for recognizing a sequence of vehicles, the apparatus including: an accumulation unit and a determination unit; wherein,

the accumulation unit is used for circularly counting the vehicles when the vehicles trigger the first coil, accumulating the RSSI value of each vehicle in each counting result, and sending the accumulated value of the RSSI value of each vehicle to the determination unit after the vehicles trigger the second coil;

and the determining unit is used for determining the vehicle sequence according to the magnitude sequence of the accumulated values of the RSSI values of each vehicle after receiving the accumulated values of the RSSI values of each vehicle sent by the accumulating unit.

In the above scheme, the device further comprises a processing unit and an opening unit; wherein,

the processing unit is used for writing each vehicle according to the sequence of the vehicles after receiving the sequence of the vehicles sent by the determining unit, and triggering the starting unit after writing is successful each time;

the opening unit is used for opening the barrier gate after receiving the triggering information of the processing unit;

the determining unit is further used for sending the determined vehicle sequence to the processing unit.

According to the method and the device for identifying the vehicle sequence, when the vehicle triggers the first coil, the vehicle is counted circularly, and the RSSI value of each vehicle in each counting result is accumulated until the vehicle triggers the second coil; and determining the sequence of the vehicles according to the sequence of the accumulated values of the RSSI values of each vehicle, so that when a plurality of vehicles simultaneously appear in the coverage range of the antenna, the sequence of the vehicles can be correctly identified.

In addition, the RSSI value of each vehicle in the counting result is respectively compared with the set reading threshold value, and whether the data of the vehicle larger than the reading threshold value and the data in the set AO matching template belong to the same region or not is judged, so that the success rate of reading data by the ultrahigh frequency reader can be increased, and unnecessary reading operation of the ultrahigh frequency reader is further reduced; and respectively comparing the RSSI value of each vehicle in the reading result with the set writing threshold value, and judging whether the data of the vehicle larger than the writing threshold value and the data in the set matching template of the AO belong to the same region, so that the success rate of writing data by the ultrahigh frequency reader can be increased, and unnecessary writing operation of the ultrahigh frequency reader is further reduced.

Drawings

FIG. 1 is a schematic flow chart of a method for identifying a vehicle sequence according to the present invention;

FIG. 2 is a schematic flow chart of a method for implementingstep 101 in FIG. 1 according to the present invention;

FIG. 3 is a schematic flow chart of a method for performing write operations in a vehicle sequence in accordance with the present invention;

fig. 4 is a schematic structural diagram of a device for identifying a vehicle sequence according to the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The scheme for identifying the vehicle sequence is realized based on the scheduling of a Low Level Reading Protocol (LLRP), and the method for identifying the vehicle sequence comprises the following steps as shown in figure 1:

step 101: when the vehicle triggers the first coil, the vehicles are counted circularly, and the RSSI value of each vehicle in each counting result is accumulated until the vehicle triggers the second coil;

here, in practical applications, the vehicle checking and the corresponding deduction operations are performed after the vehicle triggers two coils respectively, specifically, when the vehicle triggers the first coil, the vehicle checking operations are performed, that is: recognizing the sequential operation of the vehicles, enabling the vehicles to continue to move forwards, finishing the counting work when a second coil is triggered, and carrying out corresponding money deduction operation;

in practical application, as shown in fig. 2, the steps specifically include:

step 101 a: when the vehicle triggers the first coil, running the RO to perform counting operation;

here, a user issues an RO command in advance, the ultrahigh frequency reader receives the command and runs the RO when the vehicle triggers the first coil, and the RO specifically means: the ultrahigh frequency reader transmits radio wave energy with a specific frequency to the electronic license plate, and is used for driving a circuit in the electronic license plate to transmit data to the ultrahigh frequency reader in an LLRP mode.

Step 101 b: judging whether the data of the vehicle in the counting result and the data in the set matching template of the AO belong to the same region, if so, executing the step 101d, otherwise, executing thestep 101 c;

here, the counting result includes: counting the data of each vehicle and the RSSI value of each vehicle; specifically, the data of each vehicle is an Electronic Product Code (EPC) Code of each vehicle;

whether the data of the vehicle in the checking result and the data in the set matching template of the AO belong to the same area or not is judged, in other words, the data is as follows: judging whether the data in the set AO matching template is the data of an EPC region;

the set matching template of the AO comprises characters of a region to which the data belongs, and the ultrahigh frequency reader can know the region to which the data in the matching template of the AO belongs according to the characters; the user can set the matching template of the AO according to the needs, and in the actual application, the data of each checked vehicle is the EPC code of each vehicle, so the data in the matching template of the AO which is generally set is the data of the EPC area; however, since one electronic license plate information contains: data in areas such as an EPC area and a User (User) area, where data stored in the EPC area is an EPC code, and data stored in the User area is related information of a vehicle owner corresponding to a vehicle, so that the User can also set a matching template of an AO as data in other areas as needed, for example: data in the User area, at this time, the data of the vehicle in the checking result and the data in the set matching template of the AO do not belong to the data in the same area, and cannot be matched, so that the ultrahigh frequency reading area needs to read the data in the area to which the data in the matching template of the AO belongs, and then can be matched;

wherein, the user sends an AO instruction carrying a set matching template of the AO to the ultrahigh frequency reader; the issuing time of the AO command is as follows: after the RO instruction is issued by the user, an AO instruction is issued immediately after the RO instruction is issued by the user;

in subsequent operations, in order to increase the success rate of reading data by the uhf reader, before the step is performed, the method may further include:

respectively comparing the RSSI value of each vehicle in the counting result with a set reading threshold value, and judging whether the data of the vehicle larger than the reading threshold value and the data in a set matching template of AO belong to the same region;

setting a reading threshold value according to a test result of an actual application environment; for example, in an actual application environment, 10 times of tests show that when the reading threshold is set to 100, the number of times of success of reading data by the uhf reader is 9, and therefore, the reading threshold of the application environment can be set to 100;

for the data of the vehicles smaller than the reading threshold value, no processing is performed;

and when the RSSI values of all the vehicles in the counting result are smaller than the reading threshold value, executing thestep 101a and restarting the counting operation.

Step 101 c: the data of the vehicle of the area to which the data in the matching template of the AO belongs is read, after which step 101d is performed.

Step 101 d: judging whether the obtained data of the vehicle can be matched with the data in the matching template of the AO, and if so, executing thestep 101 e; otherwise, go to step 101 f;

here, the judgment as to whether or not the obtained data of the vehicle and the data in the matching template of the AO can be matched means: and respectively matching the obtained data of each vehicle with the data in the matching template of the AO, executing thestep 101e for the vehicle which is successfully matched, and executing thestep 101f for the vehicle which is not successfully matched and does not belong to the range of the vehicle which needs to be identified by the user.

Step 101 e: operating AO, calculating the Key value of each vehicle according to the read unique identifier of the electronic license plate of the vehicle and an algorithm, adding 1 to the reading times in the corresponding node information according to the Key value of each vehicle, accumulating the RSSI values, and then executing thestep 101a to restart the counting operation;

here, the operation AO means: the method comprises the following steps that a user sends an AO instruction to an ultrahigh frequency reader, and the ultrahigh frequency reader reads the unique identifier of each electronic license plate after receiving the AO instruction;

the algorithm is specifically a hash (hash) algorithm, and specifically, a Key value of each vehicle is obtained by adopting a unique identifier of an electronic license plate of each vehicle and utilizing the hash algorithm;

each vehicle corresponds to a node, and the node information comprises reading times and RSSI values;

in the practical application process, the node information can be stored in the memory of the ultrahigh frequency reader;

when the RSSI value of the vehicle is smaller, the condition that the unique identifier of the electronic license plate is not read occurs, and because the unique identifier of the electronic license plate is not read at the moment, the Key value of the vehicle cannot be obtained by utilizing a hash algorithm, only the reading times in the node information corresponding to the vehicle with the unique identifier of the electronic license plate which is read are added with 1, and the RSSI value is accumulated;

in the practical application process, if the reading threshold is set, when the RSSI value of the vehicle is smaller than the reading threshold, the unique identifier of the electronic license plate of the vehicle cannot be read, so that the success rate of reading the unique identifier of the electronic license plate is greatly improved, and unnecessary reading operation of an ultrahigh frequency reader is reduced;

when the corresponding node is not found according to the Key value, a new node is created, the reading times in the node information are added with 1, and the RSSI value is accumulated; when a new node is created, the reading times and the RSSI value in the node information are both 0;

step 101 f: no operation is performed.

Thesteps 101a to 101f are repeated until the vehicle triggers the second coil;

after each counting and AO operation is finished, the ultrahigh frequency reader reports the AO report of each vehicle with the Key value to the user according to the magnitude sequence of the accumulated value of the RSSI value of each vehicle; wherein, the AO report comprises the read unique identifier of the electronic license plate and the character with the correct unique identifier; and for the vehicle which does not read the unique identifier of the electronic license plate, the AO report is not reported.

In the description ofsteps 101a to 101f, the EPC code of each vehicle is not unique, and in practical application, the EPC code of the vehicle may be unique, if the EPC code of each vehicle has uniqueness, that is: when the EPC code can be used as the unique identifier of the electronic license plate of each vehicle, instep 101e, OA does not need to be run, the Key value of each vehicle is directly calculated from the EPC code in the checking result according to the algorithm, according to the Key value of each vehicle, the number of reads in the corresponding node information is increased by 1, and the RSSI value is accumulated at the same time.

Step 102: determining the sequence of the vehicles according to the sequence of the accumulated value of the RSSI value of each vehicle;

specifically, the accumulated values of the RSSI values of each vehicle are arranged in the descending order, and the vehicles with the large accumulated values of the RSSI values are arranged in the front;

since the nature of the RSSI values is: an index for measuring the energy returned by the ultrahigh frequency reader by the electronic license plate is provided, the RSSI value is larger, the closer the vehicle is to the ultrahigh frequency reader is shown, namely: the closer the vehicle is to the barrier gate, so that the front-back sequence of the vehicle is determined according to the distance;

in practical application, the user determines the front-back sequence of the vehicles according to the sequence reported by the AO report of each vehicle at the last time.

After the sequence of the vehicles is determined, writing operation is carried out on each vehicle according to the sequence of the vehicles, and after each writing operation is successful, a barrier is opened;

in practical application, as shown in fig. 3, the method includes:

step 301: the vehicle triggers a second coil, runs the RO and carries out counting operation;

here, the user issues an RO command in advance, and the uhf reader receives the command and operates the RO when the vehicle triggers the second coil.

Step 302: judging whether the data in the counting result and the data in the set matching template of the AO belong to the same region, if so, executing a step 304, otherwise, executing a step 303;

here, the counting result includes: counting the data of each vehicle and the RSSI value of each vehicle; specifically, the data of each vehicle is the EPC code of each vehicle;

the set matching template of the AO comprises characters of a region to which the data belongs, and the ultrahigh frequency reader can know the region to which the data in the matching template of the AO belongs according to the characters; the user can set the matching template of the AO according to the needs, and in the actual application, the data of each checked vehicle is the EPC code of each vehicle, so the data in the matching template of the AO which is generally set is the data of the EPC area; however, since one electronic license plate information contains: the data in the EPC area and the User area, where the data stored in the EPC area is an EPC code, and the data stored in the User area is related information of a vehicle owner corresponding to the vehicle, so that the User can also set a matching template of the AO as data in other areas as needed, such as: data in the User area, at this time, the data of the vehicle in the checking result and the data in the set matching template of the AO do not belong to the data in the same area, and cannot be matched, so that the ultrahigh frequency reading area needs to read the data in the area to which the data in the matching template of the AO belongs, and then can be matched;

the set AO matching template is carried in an AO command issued by a user to the ultrahigh frequency reader;

in subsequent operations, in order to increase the success rate of writing data by the uhf reader, before the step is performed, the method may further include:

respectively comparing the RSSI value of each vehicle in the counting result with a set writing threshold value, and judging whether the data of the vehicle larger than the writing threshold value and the data in a set matching template of AO belong to the same region;

wherein, the setting basis of the writing threshold is identical to the setting basis of the reading threshold, namely: setting a writing threshold value according to a test result of the actual application environment; for example, in an actual application environment, 10 tests show that when the write threshold is set to 120, the number of successful times of writing data by the uhf reader is 9, and therefore, the write threshold of the application environment can be set to 120;

when the RSSI values of all the vehicles in the counting result are smaller than the writing threshold value, executing the step 301, and restarting the counting operation; when the RSSI value of some vehicles in the counting result is smaller than the writing threshold value, after the writing operation of the current round is finished, the following steps are carried out: after the step 305 is completed, the steps 301 to 305 are executed again, and the counting operation is restarted.

Step 303: data of the vehicle of the area to which the data in the matching template of the AO belongs is read, after which step 304 is performed.

Step 304: judging whether the obtained data of the vehicle can be matched with the data in the matching template of the AO, if so, executing a step 305, otherwise, executing a step 306;

the judgment of whether the obtained data of the vehicle can be matched with the data in the matching template of the AO means that: and respectively matching the obtained data of each vehicle with the data in the matching template of the AO, executing the step 305 for the vehicle which is successfully matched, and executing the step 306 for the vehicle which is not successfully matched and does not belong to the range of the vehicle which needs to be written by the user.

Step 305: operating the AO, reading each vehicle according to the sequence of the vehicles, writing each vehicle after reading the unique identifier of the electronic license plate of the vehicle, and opening a barrier after writing each time;

here, the operation AO means: the method comprises the steps that a user sends an AO instruction to an ultrahigh frequency reader, wherein the AO instruction comprises a unique identifier of an electronic license plate of a vehicle and specific content of writing operation on the vehicle; the specific content of the write operation is as follows: the corresponding deduction amount of each vehicle;

for the vehicle with the failed write operation, executing the steps 301-305, and restarting the counting operation, the judging operation, the matching operation, the reading operation and the write operation until the write operation is successful;

after the write operation of the ultrahigh frequency reader is completed, the electronic license plate can return a response of write-back success or write failure to the ultrahigh frequency reader, and the ultrahigh frequency reader confirms whether the write is successful or not according to the response, wherein the specific processing flow is completely the same as the existing processing flow;

in practical application, if the write threshold is set, when the RSSI value of the vehicle is smaller than the write threshold, the vehicle is not subjected to write operation, so that the success rate of writing data is greatly improved, and unnecessary write operation of the ultrahigh frequency reader is reduced.

Step 306: no operation is performed.

Similarly, in the descriptions of steps 301 to 306, the EPC code of each vehicle is not unique, and in the practical application process, if the EPC code of each vehicle has uniqueness, that is: when the EPC code can be used as the unique identifier of the electronic license plate of each vehicle, in step 305, it is not necessary to read each vehicle according to the sequence of the vehicles, and each vehicle is directly written according to the EPC code, and after writing is successful each time, the barrier is opened.

In order to implement the above method, the present invention further provides an apparatus for recognizing a sequence of vehicles, as shown in fig. 4, the apparatus comprising: anaccumulation unit 41 and adetermination unit 42; wherein,

theaccumulation unit 41 is configured to count the vehicles in a circulating manner when the vehicle triggers the first coil, accumulate the RSSI value of each vehicle in each counting result, and send the accumulated value of the RSSI value of each vehicle to thedetermination unit 42 after the vehicle triggers the second coil;

and the determiningunit 42 is configured to determine the vehicle sequence according to the magnitude sequence of the accumulated values of the RSSI values of each vehicle after receiving the accumulated values of the RSSI values of each vehicle sent by the accumulatingunit 41.

Wherein, the device can also further comprise a processing unit and an opening unit; wherein,

the processing unit is used for writing each vehicle according to the sequence of the vehicles after receiving the sequence of the vehicles sent by the determiningunit 42, and triggering the starting unit after writing is successful each time;

the opening unit is used for opening the barrier gate after receiving the triggering information of the processing unit;

the determiningunit 42 is further configured to send the determined vehicle sequence to the processing unit.

It should be noted that: the accumulation unit, the determination unit and the processing unit are all logic units of the ultrahigh frequency reader.

Here, the specific processing procedures of the accumulation unit and the processing unit in the apparatus of the present invention have been described in detail above, and are not described again.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.

Claims (12)

1. A method of identifying a sequence of vehicles, the method comprising:

when the vehicle triggers the first coil, circularly counting the vehicles, and accumulating the Received Signal Strength Indication (RSSI) value of each vehicle in each counting result until the vehicle triggers the second coil;

and determining the vehicle sequence according to the magnitude sequence of the accumulated value of the RSSI value of each vehicle.

2. A method as claimed in claim 1, wherein the cycle counts vehicles and accumulates RSSI values for each vehicle in each count as:

operating Reader Operation (RO), and circularly counting;

judging whether the data of the vehicle in the checking result and the data in the matching template of the set Access Operation (AO) belong to the same area or not, further judging whether the obtained data of the vehicle can be matched with the data in the matching template of the AO or not after the data of the vehicle in the checking result and the data in the matching template of the AO belong to the same area are determined, operating the AO after the data of the vehicle and the data in the matching template of the AO can be matched, calculating the identification (Key) value of each vehicle according to the unique identification of the read electronic license plate of the vehicle, adding 1 to the reading times in the corresponding node information according to the Key value of each vehicle, and accumulating the RSSI value.

3. The method according to claim 2, wherein before determining whether the data of the vehicle in the inventory result and the data in the matching template of the set AO belong to the same area, the method further comprises:

and respectively comparing the RSSI value of each vehicle in the counting result with a set reading threshold value, and judging whether the data of the vehicle larger than the reading threshold value and the data in the set matching template of the AO belong to the same area.

4. The method of claim 2, further comprising:

and after determining that the data do not belong to the same area, reading the data of the vehicle of the area to which the data in the matching template of the AO belong, and then further judging whether the obtained data of the vehicle can be matched with the data in the matching template of the AO.

5. The method according to any one of claims 1 to 4, wherein the vehicle order is determined in order of magnitude of the accumulated value of RSSI values of each vehicle as:

the accumulated values of the RSSI values of each vehicle are arranged in the descending order, and the vehicles with the large accumulated values of the RSSI values are arranged in the front.

6. The method of any of claims 1 to 4, wherein after determining the vehicle order, the method further comprises:

and writing each vehicle according to the sequence of the vehicles, and opening the barrier after each writing is successful.

7. The method of claim 6, wherein each vehicle is written in the order of vehicles and after each write is successful, the barrier is opened by:

step a, the vehicle triggers a second coil, runs RO and carries out counting operation;

and b, judging whether the data in the checking result and the data in the set matching template of the AO belong to the same area, operating the AO after determining that the data belong to the same area, reading each vehicle according to the sequence of the vehicles, writing each vehicle after reading the unique identifier of the electronic license plate of the vehicle, and opening the barrier after writing successfully each time.

8. The method according to claim 7, wherein before determining whether the data in the inventory result and the data in the set matching template of the AO belong to the same region, the method further comprises:

and respectively comparing the RSSI value of each vehicle in the counting result with a set writing threshold value, and judging whether the data of the vehicle larger than the writing threshold value and the data in the set matching template of the AO belong to the same area.

9. The method of claim 7, further comprising:

and e, restarting the counting operation for the vehicle with the failed writing operation, and then executing the step b.

10. The method of claim 7, further comprising:

and after determining that the data do not belong to the same area, reading the data of the vehicle of the area to which the data in the matching template of the AO belong, and then further judging whether the obtained data of the vehicle can be matched with the data in the matching template of the AO.

11. An apparatus for identifying a sequence of vehicles, the apparatus comprising: an accumulation unit and a determination unit; wherein,

the accumulation unit is used for circularly counting the vehicles when the vehicles trigger the first coil, accumulating the RSSI value of each vehicle in each counting result, and sending the accumulated value of the RSSI value of each vehicle to the determination unit after the vehicles trigger the second coil;

and the determining unit is used for determining the vehicle sequence according to the magnitude sequence of the accumulated values of the RSSI values of each vehicle after receiving the accumulated values of the RSSI values of each vehicle sent by the accumulating unit.

12. The apparatus of claim 11, further comprising a processing unit and an opening unit; wherein,

the processing unit is used for writing each vehicle according to the sequence of the vehicles after receiving the sequence of the vehicles sent by the determining unit, and triggering the starting unit after writing is successful each time;

the opening unit is used for opening the barrier gate after receiving the triggering information of the processing unit;

the determining unit is further used for sending the determined vehicle sequence to the processing unit.

Images