JP2009110088A - Passage detection system, passage detection apparatus, and entrance/exit management apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To specify a passage gate through which a wireless tag passes even if a plurality of passage gates are arranged adjacent to each other. <P>SOLUTION: An entrance/exit management apparatus 10 managing a user X passing through an entrance gate 2A and an exit gate 2B is configured to specify that the user X has passed which of the gates 2A. 2B on the basis of each reception signal intensity E of electrical waves emitted from a wireless tag 20 carried by the user X and received by loop antennas 6 disposed at each of the gates 2A, 2B. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for detecting the passage of a passing object at a passage gate provided at an entrance of a facility or building.

Conventionally, when entering and exiting facilities and buildings, RFID (Radio Frequency Identification) tags of people and goods are detected by antennas installed at the entrances of these facilities and buildings, so that people and goods can enter and exit. A technique for performing management is known (for example, see Patent Document 1).
Such a technique can be applied to an entrance / exit management system for managing entrance / exit of a user who has an ID card by detecting an ID card with an RFID tag built in using an antenna installed at the entrance / exit. is there.
JP 2006-10532 A

However, when an entrance gate and an exit gate are juxtaposed at the entrance and an antenna is installed at each of the entrance gate and the exit gate, there are the following problems.
In other words, if the entrance gate and the exit gate are close to each other, there will be an overlap in the communicable areas of the antennas of the entrance gate and the exit gate, so use either the entrance gate or the exit gate. When a person passes, both gates will detect the ID card, and it becomes impossible to determine which gate the user has passed. For this reason, there is a problem in that the entrance gate and the exit gate cannot be arranged close to each other, and there are restrictions on the installation location of the passing gate.

  The present invention has been made in view of the above-described circumstances, and even when a plurality of passage gates are arranged close to each other, a passage detection system, a passage detection device, and a passage detection device that can identify a passage gate through which a wireless tag passes. An object is to provide an entrance / exit management device.

  In order to achieve the above object, the present invention provides a loop antenna provided in each of a plurality of passage gates, a wireless tag included in a passing object passing through the passage gate, and a radio wave transmitted by the wireless tag, There is provided a passage detection system comprising: a passage detection device that identifies a passage gate through which the passage object passes based on the received signal strength of each loop antenna.

  According to the present invention, when the radio wave transmitted by the wireless tag is received by the loop antenna provided in each of the plurality of pass gates, the pass gate through which the passing object passes based on the received signal strength for each loop antenna. Is identified. For this reason, even if a plurality of pass gates are arranged close to each other and an overlap occurs in the communicable area of each loop antenna, it is possible to specify the pass gate through which the passing material passes.

  Further, the present invention provides the passage detection system, wherein the passage detection device calculates, for each loop antenna, an added value of the received signal strength when the radio wave of the wireless tag is sequentially received, and for each loop antenna. The passing gate through which the passing object passes is specified based on the comparison of the addition values of the received signal strengths.

According to the present invention, as a result of measurement over a certain period, it is possible to identify a loop antenna that is receiving with a relatively strong received signal strength, that is, a loop antenna that is receiving a radio tag of a passing object closest. Therefore, the passing gate through which the passing material passes can be specified.
Moreover, since the added values of a plurality of received signal strengths are compared, the accuracy with which the passing gate passes is improved.

  In the passage detection system according to the present invention, the passage detection device arranges the received signal strengths of the loop antennas in the order of reception, and divides and adds a predetermined number of received signal strengths from the starting point for each loop antenna. Then, when shifting the starting point and adding the predetermined number of received signal strengths separately for each loop antenna, when the received signal strength of the same loop antenna is continuously maximized, It is determined that the passing object has passed through a passing gate provided with a loop antenna.

  According to the present invention, when a loop antenna receiving a relatively strong received signal intensity for a predetermined period is continuously detected, it is determined that the passing object actually passes through the passing gate. Therefore, only the passing material that has passed through the passing gate can be accurately detected.

  According to the present invention, in the passage detection system, the wireless tag transmits a transmission signal of a bit string having a predetermined format, and the passage detection device has a bit string of a reception signal received by the loop antenna that matches the predetermined format. Whether or not the received signal is a transmission signal transmitted from the wireless tag.

  According to the present invention, the received signal is transmitted from the wireless tag based on whether or not the bit string of the received signal received by the loop antenna matches a predetermined format of the bit string of the transmitted signal transmitted from the wireless tag. It is determined whether or not it is a transmission signal. As a result, even when noise around the loop antenna is received, it is determined that the received signal is not a transmission signal from the wireless tag because the bit string format of the received signal is less likely to match the format of the predetermined bit string. The received signal due to noise can be easily excluded.

  In the passage detection system, the wireless tag transmits its own ID information, and the passage detection device includes an ID information database in which ID information stored in the wireless tag is registered in advance. It is characterized by determining whether or not the ID information detected based on the received signal received by the loop antenna is the ID information of the wireless tag based on whether or not the ID information is registered in the ID information database.

  According to the present invention, it is determined whether or not the ID information detected based on the received signal received by the loop antenna is the ID information of the wireless tag based on whether or not the ID information is registered in the ID information database. The As a result, the wireless tag in which the ID information that is not registered in the ID information database is recorded, that is, the ID information detected by the passage of the unauthorized wireless tag or the wireless tag that has expired or the reception of noise around the loop antenna is obtained. Even if detected, these can be easily excluded.

  According to the present invention, in the above passage detection system, the wireless tag transmits its own ID information, and the passage detection device receives each of the ID information detected by the received signals sequentially received by the loop antennas. Based on the continuity of each ID information when arranged in the order of reception, it is determined whether each ID information is the ID information of the wireless tag.

  According to the present invention, each ID information is based on the continuity of each ID information when the ID information detected by the received signals sequentially received by the loop antennas is arranged in the order of reception. It is determined whether or not. As a result, even when noise around the loop antenna is received and ID information is detected based on the received signal, the probability that the same ID information caused by the noise is continuously detected is small. It is determined that the information is not ID information, and ID information resulting from noise can be easily excluded.

  In order to achieve the above object, the present invention receives a radio wave transmitted from a wireless tag provided on a passing object passing through a passing gate by a loop antenna provided on the passing gate, and In a passage detection device that detects passage of a gate, a reception signal strength when a radio wave transmitted from the wireless tag is received from each loop antenna of the plurality of passage gates, and a reception signal for each loop antenna A passing gate through which the passing material passes is specified based on strength.

  In order to achieve the above object, the present invention provides an entrance / exit management apparatus for managing a user who passes through an entrance gate and an exit gate, wherein radio waves transmitted from a wireless tag possessed by the user are transmitted to the entrance gate. And whether the user has passed the entrance gate or the exit gate based on the received signal strength of each loop antenna provided for each exit gate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram schematically illustrating the configuration of the entrance / exit management system 1 according to the present embodiment, and FIG. 2 is a plan view schematically illustrating the configuration of the entrance / exit management system 1.
The entrance / exit management system 1 manages entry / exit of the user X into a building, facility, station, or the like. As shown in FIGS. 1 and 2, an entrance gate 2A and an exit gate 2B are provided at entrances and exits of buildings, etc., and the entrance / exit management system 1 passes through these entrance gate 2A or exit gate 2B. The user X is identified, and entry or exit of the user X is managed.

  The configuration of the entrance / exit management system 1 will be described. The entrance / exit management system 1 is provided in each of the ID card 4 having a contactless wireless communication function possessed by the user X, and the entrance gate 2A and the exit gate 2B. Each communication control device includes a loop antenna 6, a communication control device 8 provided in each loop antenna 6, and an entrance / exit management device 10 to which each communication control device 8 is connected via a communication network 9. 8 is configured to be able to read the user ID recorded on the ID card 4 via the loop antenna 6.

  The entrance gate 2A and the exit gate 2B are each formed by partitioning a passage path by a partition wall 3, and the loop antenna 6 is provided on each floor surface of the entrance gate 2A and the exit gate 2B. As shown in FIG. 2, these loop antennas 6 are formed in a substantially rectangular shape having a size of about 0.6 meter × 1.5 meters, and have a non-directional communication range of several meters (for example, about 5 meters). Have. In the present embodiment, such loop antennas 6 are arranged in the entrance gate 2A and the exit gate 2B with a distance of about 2 meters, and an overlap occurs in the communicable region R of each loop antenna 6. .

FIG. 3 is a block diagram schematically showing the functional configuration of the ID card 4.
The ID card 4 has a built-in wireless tag 20 that realizes a non-contact wireless communication function using long waves. As shown in FIG. 4, the wireless tag 20 includes a memory 22 that stores a user ID that is identification information of the user X, an RF unit 24 for long-wave wireless communication, a control unit 26 that controls these, An antenna 28 that receives radio waves radiated from the loop antennas 6 of the entrance gate 2A and the exit gate 2B, and when the radio waves radiated by the loop antennas 6 of the entrance gate 2A and the exit gate 2B are received, the radio waves The user ID is transmitted in response to the reception.

The format of a transmission signal transmitted by the wireless tag 20 as a user ID will be described. This transmission signal is a bit string signal having a predetermined bit length (for example, 32 bits), and information on the user ID is included in the bit string. Stored. This user ID information is limited to an address range having a bit length shorter than the bit length of the transmission signal (for example, 16-bit length: 0000h to FFFFh).
At this time, a prescribed value of “0” or “1” is stored in all the bits of the transmission signal bit string other than the user ID. For example, when the specified value is “0” and the user ID is stored in the lower 16 bits of the transmission signal in a logically separated manner from other bit strings, the format of the transmission signal is “00000000h” to The bit string is “0000FFFFh”. By using such a format, it is possible to determine whether or not the bit string other than the user ID, that is, whether the higher 16 bits include bits other than the specified value, by using the transmission signal from the wireless tag 20. Whether or not there is can be identified.
The wireless tag 20 may be configured as a so-called passive type that generates electric power by electromagnetic induction by receiving radio waves from the loop antenna 6 of the communication control device 8 and returns a response. You may comprise as what is called an active type which incorporates a battery and starts communication from the radio | wireless tag 20 at arbitrary timing irrespective of reception of an electromagnetic wave.

FIG. 4 is a block diagram showing a functional configuration of the communication control device 8.
As shown in this figure, the communication control device 8 includes a control unit 30 that centrally controls each unit, a wireless communication unit 32 that communicates with the wireless tag 20 of the ID card 4 via the loop antenna 6, and a wired LAN or And a network interface (I / F) 34 connected to a communication network 9 such as a wireless LAN.

.
The wireless communication unit 32 includes a wireless communication RF circuit and a baseband circuit (not shown), and flows to the loop antenna 6 under a control of the control unit 30, for example, at regular intervals of about 5 times per second. A radio wave for electromagnetic communication with the wireless tag 20 is radiated by changing the current to cause a change in the magnetic field. When the ID card 4 exists in the communicable region R due to the emission of the radio wave, the user ID is transmitted from the wireless tag 20 of the ID card 4 and is received by the wireless communication unit 32.
Further, the wireless communication unit 32 has a reception electric field strength detection circuit 36 for detecting the received signal strength when the user ID is received from the wireless tag 20, and when receiving the user ID, the control unit together with the received signal strength. Output to 30.

The control unit 30 includes a CPU as a program execution unit, a RAM used as a work area of the CPU, a ROM that stores various programs, and the like. In the present embodiment, the control unit 30 is input from the wireless communication unit 32. A time stamp giving unit 38 for giving the current time as a time stamp to the user ID and the received signal strength, and the own device (or a loop connected to the own device) for the user ID and the received signal strength. A device ID assigning unit 39 for assigning a device ID uniquely assigned in advance to the antenna 6);
The control unit 30 gives a time stamp and a device ID each time the user ID and the received signal strength are received by the wireless communication unit 32, and enters / exits the management device from the network I / F 34 via the communication network 9. Sequentially sent to 10.
Note that the communication control devices 8 of the entrance gate 2A and the exit gate 2B measure the time synchronized with each other in order to be able to compare the time stamps assigned to each.

FIG. 5 is a block diagram showing a functional configuration of the entrance / exit management device 10.
The entrance / exit management device 10 uses the entrance / exit based on the user ID, received signal strength, time stamp, and device ID transmitted from the communication control device 8 provided in each of the entrance gate 2A and the exit gate 2B. The person X is managed.
Specifically, as shown in FIG. 5, the entrance / exit management device 10 includes a control unit 40, a network I / F 42, and a database unit 44.
The control unit 40 centrally controls each unit of the device itself, and includes a CPU as a program execution unit, a RAM that functions as a work area of the CPU, a ROM that stores various programs and setting data, and the like. Yes.
The network I / F 42 is connected to the communication network 9 and receives the user ID, received signal strength, time stamp, and device ID from each of the communication control devices 8 via the communication network 9 and outputs them to the control unit 40. .

The database unit 44 stores various databases, and includes a user ID database 44A, an entrance record database 44B, and an exit record database 44C.
In the user ID database 44A, an issued user ID, that is, a user ID effective for using the entrance / exit management system 1 is registered. In the present embodiment, as described above, the user ID is generated in an address range having a predetermined bit length (for example, 16-bit length: 0000h to FFFFh).

  In the admission record database 44B, the user ID of the user X that has passed through the admission gate 2A is recorded by the control unit 40 together with the passage date and time, and the exit record database 44C is stored in the entry record database 44C. The user ID is sequentially recorded by the control unit 40 together with the passage date and time. Therefore, based on the records in the entrance record database 44B and the exit record database 44C, it is possible to manage the user X who is currently entering, the staying time of the user X, and the like.

Based on the user ID, received signal strength, time stamp, and device ID received from the communication control device 8, the control unit 40 determines whether the user X has passed through the entrance gate 2A or the exit gate 2B. Based on this identification result, the user ID of the user X is recorded in the entrance record database 44B, and the user ID of the user X that has passed through the exit gate 2B is recorded in the exit record database 44C.
More specifically, the control unit 40 includes an invalid received data removal unit 50, a pass gate identification unit 52, and a database access unit 54.

The invalid received data removing unit 50 removes invalid received data from the received data including the user IDs sequentially sent from the communication control device 8, and includes a noise ID removing unit 60 and an invalid user ID removing unit. 62 and a sudden ID removal unit 64.
The noise ID removing unit 60 removes received data received by each communication control device 8 due to electromagnetic noise in the surrounding environment of the entrance gate 2A and the exit gate 2B, and outputs the received data to the invalid user ID removing unit 62. is there.
More specifically, when a relatively high electromagnetic noise occurs in the surrounding environment of the entrance gate 2A and the exit gate 2B, the electromagnetic noise is received as a signal from the ID card 4 by the communication control device 8 via the loop antenna 6. The user ID obtained (decoded) by the reception is transmitted to the entrance / exit management device 10 together with the time stamp, the received signal strength, and the device ID. In many cases, the data format of the received data does not match the data format of the transmission signal transmitted from the wireless tag 20.
That is, in the present embodiment, as described above, the transmission signal has a specified value of “0” or “1” for all bits in a bit string outside the user ID address range in a bit string of a predetermined bit length. The data format of storing is adopted. Therefore, by determining whether or not the received data includes a value other than the specified value in the bit string other than the address range of the user ID, the received data is received from the wireless tag 20 in accordance with the data format of the transmission signal. It becomes possible to identify whether or not it has been transmitted.
Therefore, the noise ID removing unit 60 compares the data format of the received data from the communication control device 8 with the data format used for the transmission signal of the wireless tag 20, and if the two do not match, the received data is By determining that the signal is not a transmission signal from the wireless tag 20 and deleting the received data received from the communication control device 8, the received data caused by electromagnetic noise is removed.

The invalid user ID removing unit 62 removes user IDs other than valid user IDs registered in the user ID database 44 </ b> A, extracts only valid user IDs, and outputs them to the sudden ID removing unit 64. To do.
More specifically, some received data resulting from electromagnetic noise is not removed by the noise ID removing unit 60 because the data format accidentally matches a predetermined format. In addition, a user ID of the ID card 4 in which an unauthorized ID card 4 or an expired ID card 4 is used may be transmitted from the communication control device 8.
Therefore, the invalid user ID removing unit 62 determines whether or not the user ID included in the received data is a valid user ID registered in the user ID database 44A. By deleting unnecessary received data, received data received accidentally as data in a predetermined format due to electromagnetic noise and received data including invalid user IDs are removed, thereby improving security. ing.

The sudden ID removing unit 64 removes the suddenly detected user ID as noise and outputs the noise to the passing gate specifying unit 52.
More specifically, the received data caused by electromagnetic noise coincides with a predetermined data format by chance, and the user ID is registered in the user ID database 44A. May match the ID.
Since such a user ID is detected by the communication control device 8 due to electromagnetic noise, in the reception process performed by the communication control device 8 every predetermined time (for example, 5 times / second), it is continuous. However, it is detected only once as shown by the hatched portion in FIG.

Therefore, the sudden ID removal unit 64 sorts each of the received data sequentially transmitted from each communication control device 8 in chronological order according to the reception time according to the time stamp as shown in FIG. It is determined that the user IDs that appear in isolation ("14020" and "14045" in the figure) are not user IDs received from the wireless tag 20, and the received data is deleted, resulting in electromagnetic noise. Delete received data.
Although the time stamp shown in FIG. 6 does not display digits less than a second, each received data is actually given a time stamp in the millisecond order. In FIG. Are different in millisecond digits.

  In addition, since the communicable area R of the loop antenna 6 is several meters, even if the user X walks or runs and passes through the entrance gate 2A and the exit gate 2B, each communication control device 8 is in one second. By receiving several times (in this embodiment, 5 times), each communication control device 8 detects the ID card 4 possessed by the user X continuously for a plurality of times. Therefore, as shown in FIG. 6, when the received data is sorted by the time stamp, in addition to the user IDs that appear once, user IDs whose consecutive appearances are less than a predetermined number (for example, 2 times) are reduced. You may make it do. The number of continuous appearances is determined by the size of the communicable region R of the loop antenna 6 and the lengths of the entrance gate 2A and the exit gate 2B.

The pass gate identifying unit 52 identifies whether the user X is passing through the entrance gate 2A or the exit gate 2B based on the user ID, received signal strength, time stamp, and device ID. The passing gate, the user ID and the current time are output to the database access unit 54.
More specifically, when the entrance gate 2A and the exit gate 2B are installed close to each other, an overlap occurs in the communicable region R of the loop antenna 6 provided in each, so the entrance gate 2A and the exit gate 2B are used. When the user X passes, the user ID recorded on the ID card 4 possessed by the user X is the communication control device 8 of the entrance gate 2A (device ID = IN_Gate in the drawing) as shown in FIG. ) And the communication control device 8 (device ID = OUT_Gate in the drawing) of the exit gate 2B. Therefore, it cannot be specified whether the user X has passed through the entrance gate 2A or the exit gate 2B.
Therefore, the passing gate specifying unit 52 specifies the passing gate through which the user X passes based on the received signal strength when each of the communication control devices 8 of the entrance gate 2A and the exit gate 2B receives the user ID. .

More specifically, the pass gate specifying unit 52 includes a moving average calculating unit 70 and a pass gate determining unit 72.
The moving average calculating unit 70 arranges the received data for the same user ID detected at each of the entrance gate 2A and / or the exit gate 2B in the order of reception based on the time stamp, and the communication of the entrance gate 2A. A moving average of a predetermined number of received signal strengths is calculated using the received signal strength received by the control device 8 as a positive sign and the received signal strength received by the communication control device 8 of the exit gate 2B as a negative sign, and passes the calculation result. Output to the gate determination unit 72.

That is, when the predetermined number of received signal strengths E taking a moving average is n (n ≧ 2) and the received data at the starting point O as the predetermined number of start points is the i-th data, i˜ ( The moving average A for the received signal strengths Ei to E (i + n-1) of the (i + n-1) th received data is obtained by the following equation (1).
Moving average A = αEi + αE (i + 1) +... + ΑE (i + n−1) (1)
However, α is a constant unique to each communication control device 8. In the present embodiment, when the received data is received by the communication control device 8 of the entrance gate 2A (that is, the device ID is “IN_Gate”), “α = 1” is received by the communication control device 8 of the exit gate 2B. When the received data is the received data (that is, the device ID is “OUT_Gate”), “α = −1” is set.

Here, the moving average A obtained from the equation (1) is obtained by adding a predetermined number n of received signal strengths Ei to E (i + n−1) consecutive in the order of reception, divided into device IDs, and adding each device ID. This is equivalent to the calculation of the difference between the addition values.
That is, according to the moving average A at a certain time point, a communication in which a relatively strong received signal strength is obtained while receiving the received signal strengths Ei to E (i + n−1) by the positive and negative signs. The device ID of the control device 8 will be indicated.
The detection result shown in FIG. 7 will be described as an example. When the moving average A is calculated by setting the predetermined number n of received data to “5” and the starting point O as i = 1, i = 1 to 5 received signals. Since the moving average A of the intensity is a positive value (A = 7438), it is found that the received signal intensity by the loop antenna 6 provided at the entrance gate 2A is high at this time. Accordingly, it is indicated that the user X is closer to the entrance gate 2A than the exit gate 2B.

In addition, when a pass gate other than the entrance gate 2A and the exit gate 2B is further added and three or more pass gates are arranged in parallel, the received signal strength of a predetermined number n consecutive in the order of reception is the same as described above. Ei to E (i + n-1) are divided into device IDs, added to each other, and the added values for the respective device IDs are compared to identify the device ID having the largest added value. At that time, the pass gate with which the user X is closest is specified.
Further, as the value of the predetermined number n is larger, the range in which the user X moves while the received data is obtained becomes larger, so the position of the user X indicated by the moving average A at that time is uncertain. Arises. Therefore, the predetermined number n is determined according to the speed of movement of the user X and the like.

Here, by calculating the moving average A at a certain point in time, the pass gate closer to the user X out of the entrance gate 2A and the exit gate 2B is specified, but the user X approaches this pass gate. However, it may not actually pass.
Therefore, the moving average calculating unit 70 sequentially calculates the moving average A of the predetermined number n of received signal strengths E as shown in FIG. 7 while shifting the starting point O by “+1” in the order of reception.
As a result, when the sign of the moving average A is continuously the same, the user X crosses the loop antenna 6 and passes through the entrance gate 2A and the exit gate 2B. It is estimated that the received signal strength of the loop antenna 6 becomes higher.
Therefore, in the detection example shown in FIG. 7, after the sign of the moving average A is continuously positive, the sign of the moving average A is continuously negative at 4:09:36 time stamp. After the user X passes through the entrance gate 2A, it is shown that the user X passes through the exit gate 2B at 4:09:36.

Based on the sign of the moving average A, the passing gate determining unit 72 determines whether the user X passes through the entrance gate 2A or the exit gate 2B, and the continuity of the sign of the moving average A. Based on (continuous number of times), it is determined whether or not the user X has actually passed through the passing gate. If it is determined that the user has passed, the user ID, passing gate, and passing time (current time) ) Is output to the database access unit 54.
In addition, when a pass gate other than the entrance gate 2A and the exit gate 2B is further added and three or more pass gates are arranged in parallel, a predetermined number n of received signal strengths Ei to E (i + n− consecutive in the order of reception). 1) is added to each device ID, and the maximum device ID when comparing the added values for each device ID is shifted by “+1” as described above for each device ID. When the addition value is calculated, if it continues, it is determined that the user X has passed through the pass gate corresponding to the device ID.

The database access unit 54 selects the entry record database 44B and the exit record database 44C based on the pass gate output from the pass gate determination unit 72, and records the user ID and the passing time.
That is, the database access unit 54 records the user ID of the user X together with the passage time (entry time) when the passage gate determination unit 72 determines that the user X has passed the entrance gate 2A. When it is determined that the user X has passed the exit gate 2B, the user ID of the user X is recorded in the exit record database 44C together with the passage time (exit time).

Under such a configuration, in the entrance / exit management system 1, as shown in FIG. 1, when the user X approaches the entrance gate 2 </ b> A trying to enter, the ID card 4 possessed by the user X is kept for a certain period of time. Detected by the respective loop antennas 6 of the entrance gate 2A and the exit gate 2B that repeatedly detect each time.
As a result, the user ID recorded on the wireless tag 20 of the ID card 4 is sequentially received by the respective communication control devices 8 of the entrance gate 2A and the exit gate 2B, and together with the user ID, the time stamp, the received signal strength, The device ID is sequentially input to the entrance / exit management device 10 as received data.

When the reception data is input, the entrance / exit management device 10 executes a pass gate determination process shown in FIG. 8 to determine which pass gate of the entrance gate 2A and the exit gate 2B the user X has passed. .
That is, when the reception data is input (step S1), the entrance / exit management device 10 removes invalid reception data by the invalid reception data removal unit 50 so as to extract only reception data including a valid user ID. To do.
Specifically, the noise ID removing unit 60 removes received data that does not match a predetermined data format used for the transmission signal of the wireless tag 20 (step S2), and the invalid user ID removing unit 62 The received data including the user ID other than the valid user ID registered in the ID database 44A is removed (step S3), and the sudden ID removal unit 64 includes the suddenly detected user ID. Received data is removed as noise (step S4).

Next, the pass gate identifying unit 52 of the entrance / exit management device 10 executes the following process to determine the pass gate through which the user X has passed.
That is, as shown in FIG. 7, the moving average calculation unit 70 of the passing gate specifying unit 52 sorts each reception data received with the same user ID in the order of reception based on the time stamp (step S5).
Next, the moving average calculation unit 70 shifts the predetermined number n of the starting points O for taking the moving average of the received signal strength E by “+1” in order of reception from the i-th data, while receiving the received signal strength for each predetermined number n. The moving average A of E is calculated sequentially (step S6).
And the passage gate determination part 72 of the passage gate specific | specification part 52 determines whether the code | symbol of the moving average A has continued more than predetermined times (step S7), and when it is continuing (step S7: Yes) ), It is determined that the user X has actually passed through the pass gate corresponding to the code, and the user ID, pass gate, and pass time (current time) are output to the database access unit 54 (step S8). Thereby, the entrance / exit of the user X is recorded in the entrance record database 44B or the exit record database 44C.
On the other hand, when the sign of the moving average A is not continuous more than a predetermined number of times (step S7: No), it is determined that the user X has not passed the passing gate, and the process is terminated.

  As described above, according to the entrance / exit management system 1 of the present embodiment, the entrance / exit management device 10 uses the loop antennas 6 provided to the entrance gate 2A and the exit gate 2B for the radio waves transmitted by the wireless tag 20, respectively. In order to identify the passing gate through which the user X passes based on the received signal strength E, the entrance gate 2A and the exit gate 2B are close enough to cause an overlap in the communicable region R of each loop antenna 6. Even if it is arranged in such a way, it is possible to specify which passing gate the user X has passed.

According to the entrance / exit management system 1 of the present embodiment, the entrance / exit management device 10 sequentially adds the received signal strength E for each loop antenna 6 to calculate the added value, and the received signal strength E for each loop antenna 6 is calculated. In order to identify the pass gate through which the user X passes based on the comparison of the added values, the loop antenna 6 that is receiving with a relatively strong received signal strength E for a certain period of time, that is, the user X's The loop antenna 6 receiving the wireless tag 20 closest is identified.
In addition, since the added values of the plurality of received signal strengths E are compared, the accuracy of specifying the pass gate can be improved.

  According to the entrance / exit management system 1 of the present embodiment, the entrance / exit management device 10 arranges the received signal strengths of the loop antennas 6 of the entrance gate 2A and the exit gate 2B in the order of reception, and a predetermined number n from the counting start point O. When the moving average A of the received signal strength E is sequentially calculated while shifting the calculation start point O, and the sign of the moving average A is continuously the same, that is, the device ID having the larger received signal strength E Since the user X is determined to have actually passed through the passing gate corresponding to the device ID when only the user X that has actually passed through the entrance gate 2A and the exit gate 2B is used. Can be accurately detected.

  According to the entrance / exit management system 1 of the present embodiment, the entrance / exit management device 10 receives received data based on whether the data format used for the transmission signal of the wireless tag 20 matches the data format of the received data. Therefore, it is possible to easily exclude the reception data resulting from the reception of noise.

  According to the entrance / exit management system 1 of the present embodiment, the entrance / exit management device 10 uses the wireless tag based on whether or not the user ID detected based on the received data is registered in the user ID database 44A. Since it is determined whether or not the user ID is 20, the user ID detected by passing an unauthorized wireless tag or a wireless tag that has already expired or receiving noise can be easily excluded.

  According to the entrance / exit management system 1 of the present embodiment, the entrance / exit management device 10 stores the user IDs detected by the received data sequentially received by the loop antennas 6 in the order of reception. Since it is determined whether each user ID is a user ID of the wireless tag 20 based on continuity, the user ID caused by noise can be easily excluded.

  In addition, embodiment mentioned above shows the one aspect | mode of this invention to the last, and a deformation | transformation and application are arbitrarily possible within the scope of the present invention.

For example, in the above-described embodiment, when calculating the moving average A, the moving average A may be calculated by multiplying the reception signal strength E by a correction coefficient for correcting the difference in reception sensitivity between the loop antennas 6. good.
Even if each loop antenna 6 of the pass gate does not have the same reception sensitivity, the user X passes through which pass gate based on the received signal strength of the received data received by these loop antennas 6. Can identify.

Moreover, in the above-described embodiment, the case where the present invention is applied to the entrance / exit management device 10 is illustrated. However, the present invention is not limited to this, and an automatic ticket gate system can be realized by being provided at an entrance to a station premises, Further, the present invention can be applied to a system that detects passage of an article through a passage gate.
According to the present invention, since the passage of the wireless tag 20 is detected only by passing through the passage gate, the automatic ticket gate to which the present invention is applied is compared with, for example, a conventional automatic ticket gate system using an IC card. In the system, when the user X passes through the passing gate, an operation such as bringing an IC card close to the card reading unit provided in the passing gate is unnecessary, and a highly convenient automatic ticket gate system is realized.

The figure which shows typically the structure of the entrance / exit management system which concerns on embodiment of this invention. The top view which shows typically the structure of an entrance / exit management system. The block diagram which shows the functional structure of an ID card. The block diagram which shows the functional structure of a communication control apparatus. The block diagram which shows the functional structure of an entrance / exit management apparatus. The figure for demonstrating removal of user ID which generate | occur | produced suddenly. The figure for demonstrating the calculation of a moving average. The flowchart of a passage gate determination process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Entrance / exit management system (passage detection system), 2A ... Entrance gate, 2B ... Exit gate, 4 ... ID card, 6 ... Loop antenna, 8 ... Communication control device, 10 ... Entrance / exit management device (passage detection device), DESCRIPTION OF SYMBOLS 20 ... Wireless tag, 50 ... Invalid reception data removal part, 70 ... Moving average calculation part, 72 ... Passing gate determination part, A ... Moving average, E ... Received signal strength, O ... Starting point, R ... Communication possible area, X ... User.

Claims (8)

A loop antenna provided at each of a plurality of passing gates;
A wireless tag included in a passing object passing through the passage gate;
A passage detection system comprising: a passage detection device that identifies a passage gate through which the passage object passes the radio wave transmitted by the wireless tag based on the received signal strength of each loop antenna. The passage detection system according to claim 1,
The passage detection device is
For each loop antenna, calculate the added value of the received signal strength when the radio waves of the wireless tag are sequentially received, and based on the comparison of the received signal strength added value for each loop antenna, A passage detection system characterized by specifying a passage gate through which the air passes. The passage detection system according to claim 1,
The passage detection device is
The received signal strengths of the loop antennas are arranged in the order of reception, and a predetermined number of received signal strengths are divided and added for each loop antenna from the starting start point, and then the predetermined starting number of received signals are shifted. When the strength is divided and added for each loop antenna, and the received signal strength of the same loop antenna is continuously maximized, it is determined that the passing object has passed through the pass gate provided with the loop antenna. A passage detection system characterized by In the passage detection system according to any one of claims 1 to 3,
The wireless tag transmits a transmission signal of a bit string of a predetermined format,
The passage detection device is
Determining whether or not the received signal is a transmission signal transmitted from the wireless tag, based on whether or not a bit string of a received signal received by the loop antenna matches the predetermined format. Passage detection system. In the passage detection system according to any one of claims 1 to 4,
The wireless tag transmits its own ID information,
The passage detection device is
An ID information database in which ID information stored in the wireless tag is registered in advance;
Determining whether the ID information detected based on the received signal received by the loop antenna is the ID information of the wireless tag based on whether or not the ID information is registered in the ID information database. Passage detection system. In the passage detection system according to any one of claims 1 to 5,
The wireless tag transmits its own ID information,
The passage detection device is
Whether each ID information is the ID information of the wireless tag based on the continuity of each ID information when the ID information detected by the received signals sequentially received by each loop antenna is arranged in the order of reception A passage detection system characterized by In the passage detection device that receives a radio wave transmitted from a wireless tag provided in a passing object passing through a passage gate by a loop antenna provided in the passage gate, and detects the passage of the passing object through the gate,
The reception signal strength when receiving the radio wave transmitted from the wireless tag is obtained from each loop antenna of the plurality of passage gates, and the passing object passes based on the reception signal strength for each loop antenna. A passage detection device characterized by specifying a passage gate. In the entrance / exit management device that manages users passing through the entrance gate and exit gate,
Based on the received signal strength of each loop antenna provided for each of the entrance gate and the exit gate, the user transmits the radio wave transmitted from the wireless tag possessed by the user to the entrance gate and the exit gate. An entrance / exit management device characterized by identifying which one has passed.

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