CN111886512A

CN111886512A - Traffic monitoring system and RF tag

Info

Publication number: CN111886512A
Application number: CN201880091421.6A
Authority: CN
Inventors: 伊藤幸乃
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2018-03-29
Filing date: 2018-03-29
Publication date: 2020-11-03
Anticipated expiration: 2038-03-29
Also published as: JPWO2019186883A1; WO2019186883A1; CN111886512B; JP6849147B2

Abstract

The traffic monitoring system of the present invention includes: an RF tag which is carried by a user and has inherent tag identification information; more than 2N readers arranged in the passing direction of a road provided with a passing route of a 1 st route and a 2 nd route and having inherent reader identification information; a reception intensity measuring unit that measures a reception intensity of the interrogation radio wave received by the RF tag from the reader/writer; a route determination unit that determines whether the user is located on a 1 st route and whether the user is located on a 2 nd route, based on the tag identification information, the reader/writer identification information, and the reception intensity for each of the interrogation radio waves received by the RF tag during a predetermined route determination period; and a meandering determination unit that determines that the user has traveled meandering through the road when the number of times of route movement of the user from one route to the other route of the 1 st route and the 2 nd route is equal to or greater than a meandering threshold value within a predetermined meandering determination period.

Description

Traffic monitoring system and RF tag

Technical Field

The invention relates to a traffic monitoring system and an RF tag.

Background

A conventional movement detection system including a base unit and a slave unit that transmits and receives a radio wave signal to and from the base unit and detects movement of the slave unit, wherein the base unit includes slave unit movement determination means for determining movement of the slave unit based on a change in an intensity level of the radio wave signal transmitted and received to and from the slave unit, and radio wave signal cut-off means for weakening or cutting off the radio wave signal transmitted and received between the base unit and the slave unit is provided in association with the base unit, and when the slave unit is located in a 1 st zone, transmission and reception of the radio wave signal between the base unit and the slave unit are enabled, and when the slave unit is located in a 2 nd zone adjacent to the 1 st zone, the radio wave signal transmitted and received between the base unit and the slave unit is weakened or cut off by the radio wave signal cut-off means, the slave unit movement determination means of the master unit determines that the slave unit moves from the 1 st zone to the 2 nd zone when a decrease in the intensity level of the radio wave signal transmitted and received between the master unit and the slave unit is greater than a 1 st predetermined level, and determines that the slave unit moves from the 2 nd zone to the 1 st zone when an increase in the intensity level of the radio wave signal transmitted and received between the master unit and the slave unit is greater than a 2 nd predetermined level (see, for example, patent document 1).

In the above-described movement detection system, the radio signal cutting means for weakening (or cutting) the radio signal transmitted and received between the master unit and the slave unit is provided, and when the slave unit is located in the 1 st zone, the radio signal can be transmitted and received between the master unit and the slave unit, and when the slave unit is located in the 2 nd zone adjacent to the 1 st zone, the radio signal transmitted and received between the master unit and the slave unit is weakened (or cut) by the radio signal cutting means. Thus, when the slave unit moves from the 1 st zone to the 2 nd zone (or from the 2 nd zone to the 1 st zone), the intensity level of the radio signal decreases more than the 1 st predetermined level (or the intensity level increases more than the 2 nd predetermined level), and the master unit can reliably detect a change in the intensity level of the radio signal. Therefore, the movement of the slave unit between the detection area and the non-detection area can be detected with high accuracy.

Next, the conventional behavior detection device is characterized by including: at least one camera device; a storage unit that stores face information of a subject person in association with attribute information relating to dangerous behavior; a face collation section that detects a face image from an image captured by the image capture device and collates the detected face image with the face information stored in the storage section to specify the subject person; a behavior feature detection unit that detects a feature of a behavior of the subject person from an image captured by the imaging device; and a dangerous behavior detection unit that detects that the subject person performs a dangerous behavior by comparing the attribute information stored in the storage unit in association with the subject person identified by the face comparison unit with the characteristic of the behavior detected by the behavior characteristic detection unit, wherein the characteristic amount of the behavior of the subject person is detected as a zigzag walking number of times of crossing of a left line and a right line displayed on a bottom surface of the door, based on time-series data of the face position of the subject person at the door (for example, see patent document 2).

In the above-described action detection device, since only dangerous actions of the target person can be detected, normal actions are not targeted for notification to staff. Further, since the dangerous behavior of the target person, which is a sign of the event or accident, can be detected, the dangerous behavior of the target person can be presented to the staff at a stage before the event or accident occurs. Therefore, it is possible to reduce the labor cost required for the facility and reduce the occurrence risk of events and accidents in the facility.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-7598

Patent document 2: japanese patent laid-open publication No. 2011-34357

Disclosure of Invention

Problems to be solved by the invention

However, in the above-described movement detection system, since the detection area of the master unit is limited, it is impossible to determine whether the slave unit passes through the road with meandering or without meandering on a road longer than the detection area of the master unit.

Further, in the above-described behavior detection device, the image pickup device is expensive, and it is necessary to display the left and right lines on the bottom surface of the door to detect the zigzag walking.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a traffic management system capable of determining whether a user is passing through a road with meandering or without meandering.

Means for solving the problems

The traffic monitoring system of the present invention includes: an RF tag which is carried by a user and has inherent tag identification information; more than 2N readers arranged in the passing direction of a road provided with a passing route of a 1 st route and a 2 nd route and having inherent reader identification information; a reception intensity measuring unit that measures a reception intensity of the interrogation radio wave received by the RF tag from the reader/writer; a route determination unit that determines whether the user is located on the 1 st route and whether the user is located on the 2 nd route, based on the reader/writer identification information of the reader/writer that has transmitted the interrogation radio wave for each of the interrogation radio waves received by the RF tag, the tag identification information of the RF tag that has received the interrogation radio wave, and the reception intensity of the interrogation radio wave; and a meandering determination section that determines whether the user passes meandering or without meandering in the road, in accordance with a number of times of route movement by the user from one route to the other route of the 1 st route and the 2 nd route.

Effects of the invention

According to the traffic management device of the present invention, it is possible to determine whether the user is passing through the road with or without meandering by measuring the intensity of the radio waves transmitted from the plurality of readers/writers arranged in the traffic direction of the road and received by the RF tag carried by the user.

Drawings

Fig. 1 is a schematic diagram of a traffic management device according to embodiment 1 of the present invention.

Fig. 2 is a plan view of a road to which the traffic control device according to embodiment 1 of the present invention is applied.

Fig. 3 is a plan view of a road to which the traffic control device according to embodiment 1 of the present invention is applied.

Fig. 4 is a block diagram of a traffic management device according to embodiment 1 of the present invention.

Fig. 5 is a flowchart showing the operation of the traffic management device according to embodiment 1 of the present invention.

Fig. 6 is a schematic diagram of a traffic management device according to embodiment 2 of the present invention.

Fig. 7 is a plan view of a road to which a traffic control device according to embodiment 2 of the present invention is applied.

Fig. 8 is a plan view of a road to which a traffic control device according to embodiment 2 of the present invention is applied.

Fig. 9 is a block diagram of a traffic management device according to embodiment 2 of the present invention.

Fig. 10 is a flowchart showing the operation of the traffic management device according to embodiment 2 of the present invention.

Fig. 11 is a plan view of a road to which a traffic control device according to embodiment 1 of the present invention is applied.

Fig. 12 is a plan view of a road to which the traffic control device according to embodiment 1 of the present invention is applied.

Fig. 13 is a plan view of a road to which a traffic control device according to embodiment 2 of the present invention is applied.

Fig. 14 is a plan view of a road to which the traffic control device according to embodiment 2 of the present invention is applied.

Fig. 15 is a block diagram of a traffic management device to which an RF tag according to embodiment 3 of the present invention is applied.

Fig. 16 is a flowchart showing the operation of the traffic management device to which the RF tag according to embodiment 3 of the present invention is applied.

Detailed Description

Hereinafter, preferred embodiments of the traffic management device and the RF tag according to the present invention will be described with reference to the drawings.

Embodiment mode 1

As shown in fig. 1, the traffic management device 1 is a traffic management device as follows: when a user 10 carrying an RF tag 100 passes through a road 20, the host device 300 determines whether the user 10 passes through the road 20 while meandering based on the intensity of radio waves transmitted from the reader/writer 200 and received by the RF tag 100, and the road 20 includes a plurality of reader/writers 200 arranged in the direction of passage.

Here, the user 10 is a person who wanders, such as a psychotic patient or a dementia patient, the manager 11 is a person who manages the user 10, such as a nurse or a caregiver, and the road 20 is a road through which the user 10 passes in facilities such as a hospital or an elderly care institution, for example.

The RF tag may be referred to as an IC tag or an RFID tag, but in the following description, terms such as RF tag are used.

The reader/writer does not necessarily have both a function of reading data from the RF tag (reader function) and a function of writing data to the RF tag (writer function), and may have at least one function.

Next, 2 traffic routes provided on the road 20 in the traffic management device 1 and the winding determination of the user 10 traveling on the road 20 will be described with reference to fig. 2 and 3.

Fig. 2 and 3 are plan views of roads to which the traffic control device according to embodiment 1 of the present invention is applied. Fig. 2 shows the 1 st detection range 21, the 2 nd detection range 22, and the 3 rd detection range 23, which are the 3 detection ranges of the reader/writer 200 nearest to the user 10. Fig. 3 shows a 1 st route 24 and a 2 nd route 25 as 2 traffic routes of the road 20.

The reader/writer 200 is arranged on one side of the road 20 in the passing direction, and has 2 detection thresholds. The 2 detection thresholds are the 1 st detection threshold and the 2 nd detection threshold that is a value equal to or less than the 1 st detection threshold.

The range in which the intensity of the radio wave transmitted by the reader/writer 200 and received by the RF tag 100 is equal to or greater than the 1 st detection threshold is the 1 st detection range 21, the range which is smaller than the 1 st detection threshold and equal to or greater than the 2 nd detection threshold is the 2 nd detection range 22, and the range which is smaller than the 2 nd detection threshold is the 3 rd detection range 23. In other words, the 1 st detection range 21, the 2 nd detection range 22, and the 3 rd detection range 23, which are 3 detection ranges, are set to the reader/writer 200 in accordance with the 1 st detection threshold and the 2 nd detection threshold. Fig. 2 shows a case where the user 10 is located in the 1 st detection range 21 of the nearest reader/writer 200.

Further, a range obtained by combining the 1 st detection ranges 21 of all the readers 200 is defined as the 1 st route 24, and a range obtained by removing the 1 st detection range 21 and the 2 nd detection range 22 of all the readers 200 from a range obtained by combining the 3 rd detection ranges 23 of all the readers 200 is defined as the 2 nd route 25. In other words, the 1 st route 24 and the 2 nd route 25, which are 2 transit routes, are set for the road 20 in accordance with the 1 st detection range 21, the 2 nd detection range 22, and the 3 rd detection range 23 of all the reader/writers 200. Fig. 3 shows the user 10 on route 1 24.

That is, the 1 st route 24 and the 2 nd route 25 as 2 passing routes are set for the road 20 based on the 1 st detection threshold and the 2 nd detection threshold as the 2 detection thresholds.

When the user 10 carrying the RF tag 100 is located on the road 20, it is determined that the user 10 is located on the 1 st route 24 when the intensity of one or more radio waves transmitted from the reader/writer 200 and received by the RF tag 100 is equal to or greater than the 1 st detection threshold, and when the intensity of all radio waves transmitted from the reader/writer 200 and received by the RF tag 100 is less than the 2 nd detection threshold, it is determined that the user 10 is located on the 2 nd route 25.

When the user 10 passes through the road 20, the passing route where the user 10 is located changes with the passage of time, and when the number of times the user 10 moves from one route of the 1 st route 24 and the 2 nd route 25 to the other route, that is, the number of times the user moves is equal to or greater than the meandering threshold value, it is determined that the user 10 passes through the road 20 while meandering, and when the number of times the user moves is less than the meandering threshold value, it is determined that the user 10 passes through the road 20 without meandering. In fig. 3, the route movement number of the passing route of the user 10 is 4. At this time, if the meandering threshold value is 4 or less, it is determined that the user 10 is going to meander on the road 20, and if the meandering threshold value is greater than 4, it is determined that the user 10 is going to pass on the road 20 without meandering.

Next, the hardware configuration of the traffic management device 1 will be described with reference to fig. 4. Fig. 4 is a block diagram of a traffic management device according to embodiment 1 of the present invention. As shown in fig. 4, the traffic management device 1 includes an RF tag 100, a reader/writer 200, and a host device 300. Hereinafter, the RF tag 100, the reader/writer 200, and the host device 300 will be described in order.

The RF tag 100 includes a storage unit 110, a communication unit 120, and a reception intensity measuring unit 130. The storage unit 110 stores unique tag identification information. The communication section 120 modulates data into a communication signal and transmits it by radio waves, and demodulates the communication signal received by radio waves into data. The reception intensity measuring unit 130 measures the reception intensity, which is the intensity of the received radio wave.

The reader/writer 200 includes a storage unit 210, a 1 st communication unit 220, a reception intensity comparing unit 230, and a 2 nd communication unit 240. The storage unit 210 stores the unique reader/writer identification information, the 1 st detection threshold value, and the 2 nd detection threshold value. The 1 st communication part 220 modulates data into a communication signal and transmits it by radio waves, and demodulates a communication signal received by radio waves into data. The reception intensity comparing unit 230 compares the reception intensity measured by the reception intensity measuring unit 130 with the 1 st detection threshold and the 2 nd detection threshold stored in the storage unit 210. The 2 nd communication unit 240 modulates data into a communication signal and transmits the communication signal to the higher-level device 300. The communication signal transmitted from the 2 nd communication unit 240 to the upper apparatus 300 may be wired or wireless.

The host device 300 includes a communication unit 310, a storage unit 320, a route determination unit 330, a movement number counting unit 340, a meandering determination unit 350, and a notification unit 360. The communication unit 310 demodulates a communication signal received from the reader/writer 200 into data. The storage unit 320 stores user setting information in which tag identification information, user identification information of the user 10, and a meandering threshold value are associated with each other, and detection information, which will be described later, received by the communication unit 310 from the reader/writer 200. The route determination unit 330 determines whether the user 10 is located on the 1 st route 24 and whether the user 10 is located on the 2 nd route 25. The movement number counting part 340 counts the number of times the user 10 moves from one route to the other route of the 1 st route 24 and the 2 nd route 25, that is, the route movement number. The meandering determination unit 350 determines whether the user 10 is passing in a meandering manner or not in the road 20. When the meandering determination unit 350 determines that the user 10 has traveled the road 20 while meandering, the notification unit 360 notifies.

Next, a flow of the traffic control device 1 determining the meandering of the user 10 who passes through the road 20 will be described with reference to fig. 5. Fig. 5 is a flowchart showing the operation of the traffic management device according to embodiment 1 of the present invention. The operations of the RF tag 100, the reader/writer 200, and the host device 300 included in the traffic management device 1 will be described in order below.

First, the operation of the RF tag 100 will be described in order. When the RF tag 100 carried by the user 10 comes within a communicable range of the reader/writer 200, the communication unit 120 receives an inquiry radio wave, which is a radio wave including reader/writer identification information transmitted from the reader/writer 200 (S101 in fig. 5). The reception intensity measuring unit 130 measures the reception intensity of the interrogation radio wave received by the communication unit 120 (S102 in fig. 5). The communication unit 120 transmits a response radio wave including response information in which the reception time, which is the time when the communication unit 120 receives the inquiry radio wave, the reception intensity of the inquiry radio wave measured by the reception intensity measuring unit 130, the reader/writer identification information included in the inquiry radio wave received by the communication unit 120, and the tag identification information stored in the storage unit 110 are associated with each other (S103 in fig. 5).

Next, the operation of the reader/writer 200 will be described in order. The 1 st communication unit 220 transmits an interrogation radio wave as a radio wave including the reader/writer identification information stored in the storage unit 210 (S201 in fig. 5). When the 1 st communication unit 220 receives a response wave including the same reader/writer identification information as the reader/writer identification information stored in the storage unit 210, the reception intensity comparison unit 230 starts comparison (S202 in fig. 5). The reception intensity comparing unit 230 compares whether or not the reception intensity included in the response radio wave received by the 1 st communication unit 220 is equal to or higher than the 1 st detection threshold stored in the storage unit 210 and is lower than the 2 nd detection threshold stored in the storage unit 210 (S203 in fig. 5). The 2 nd communication unit 240 transmits a detection signal including detection information in which tag identification information, reception time and reception intensity included in the response radio wave received by the 1 st communication unit 220, and reader/writer identification information stored in the storage unit 210 and the result of comparison by the reception intensity comparison unit 230 are associated to the upper device 300 (S204 in fig. 5).

Finally, the operation of the host device 300 will be described in order. The communication unit 310 receives the detection signal transmitted by the reader/writer 200 (S301 in fig. 5). The storage unit 320 stores detection information included in the detection signal received by the communication unit 310. The route determination unit 330 starts the determination every time a route determination period described later elapses (S302 in fig. 5). Among the detection information stored in the storage unit 320, when one or more reception intensities are equal to or greater than the 1 st detection threshold value, among the detection information including the tag identification information of the RF tag 100 carried by the user 10 and the detection information corresponding to the reception time in the route determination period described later, the route determination unit 330 determines that the user 10 is located in the 1 st route 24, and when all the reception intensities are smaller than the 2 nd detection threshold value, the route determination unit 330 determines that the user 10 is located in the 2 nd route 25 (S303 in fig. 5). When the route determination unit 330 determines that the user 10 is located on the traffic route and the traffic route determined this time is different from the traffic route determined last time, the travel number counting unit 340 counts the number of times the user 10 has traveled the route by adding 1 (S304 in fig. 5). When the route movement frequency of the user 10 counted by the movement frequency counting unit 340 is equal to or greater than the meandering threshold value of the user 10 stored in the storage unit 320, the meandering determination unit 350 determines that the user 10 makes a meandering passage on the road 20, and when the route movement frequency of the user 10 counted by the movement frequency counting unit 340 is smaller than the meandering threshold value of the user 10 stored in the storage unit 320, the meandering determination unit 350 determines that the user 10 makes a passage on the road 20 without meandering (S305 in fig. 5). When the meandering determination unit 350 determines that the user 10 has traveled the road 20 while meandering, the notification unit 360 notifies (S306 in fig. 5). The meandering determination is continued by counting the number of times of the route movement until a meandering determination period (S307 in fig. 5) described later elapses, and the number of times of the route movement is initialized every time the meandering determination period described later elapses (S308 in fig. 5).

As described above, the traffic management device 1 determines the meandering of the user 10 who passes through the road 20.

Here, the route determination period and the meandering determination period will be described.

The route determination period is a sufficient time required until all the reader/writers 200 transmit the interrogation radio wave, the RF tag 100 transmits the response radio wave to all the received interrogation radio waves, all the reader/writers 200 that receive the response radio wave transmit the detection signal, and the route determination unit 330 performs the determination based on all the detection signals received by the host device 300.

The meandering determination period is a time obtained by multiplying at least a time obtained by adding a sufficient time required from the determination by the route determination unit 330 to the determination by the meandering determination unit 350 by a value obtained by adding 1 to the meandering threshold value. Note that, the meandering determination period may be ended when all the reader/writers 200 do not receive the response wave from the RF tag 100 during the route determination period, and the meandering determination period may be started when any of the reader/writers 200 receives the response wave from the RF tag 100.

According to the traffic management device of embodiment 1 of the present invention, by measuring the intensity of radio waves transmitted from the plurality of readers/writers 200 arranged on one side of the road 20 in the traffic direction and received by the RF tag 100 carried by the user 10, it is possible to determine whether the user 10 is passing on the road 20 with meandering or without meandering.

The host device 300 can notify the administrator 11 that the user 10 has traveled the road 20 while meandering.

Embodiment mode 2

As shown in fig. 6, the traffic management device 2 is a traffic management device as follows: when a user 10 carrying an RF tag 100 passes through a road 20, the host device 500 determines whether the user 10 passes through the road 20 while meandering based on the intensity of radio waves transmitted from the reader/writer 400 and received by the RF tag 100, and the road 20 includes a plurality of reader/writers 400 arranged in the direction of passage.

Although the reader/writer 200 is arranged on one side of the road 20 in the passing direction in embodiment 1, the reader/writer 400 is arranged on one side and the other side of the road 20 in the passing direction in embodiment 2.

Next, 2 traffic routes provided on the road 20 in the traffic management device 2 and the winding determination of the user 10 traveling on the road 20 will be described with reference to fig. 7 and 8.

Fig. 7 and 8 are plan views of roads to which the traffic control device according to embodiment 2 of the present invention is applied. Fig. 7 shows the 1 st detection range 26 as one detection range of the reader/writer 400 nearest to the user 10. Fig. 8 shows a 1 st route 27 and a 2 nd route 28 as 2 traffic routes of the road 20. Here, the reader/writer 400 arranged on one side of the road 20 is referred to as a 1 st reader/writer 400a, and the reader/writer 400 arranged on the other side of the road 20 is referred to as a 2 nd reader/writer 400 b.

The reader 400 has a detection threshold. One detection threshold is the 1 st detection threshold.

The range in which the intensity of the radio wave transmitted by the reader/writer 400 and received by the RF tag 100 is equal to or higher than the 1 st detection threshold is defined as the 1 st detection range 26. In other words, the 1 st detection range 26 as one detection range is set to the reader/writer 400 based on the 1 st detection threshold. Fig. 7 shows a case where the user 10 is located in the 1 st detection range 26 of the nearest reader/writer 400.

Further, a range obtained by removing the 1 st detection range 26 of all the 2 nd reader/writers 400b from the range obtained by combining the 1 st detection ranges 26 of all the 1 st reader/writers 400a is defined as the 1 st route 27, and a range obtained by removing the 1 st detection range 26 of all the 1 st reader/writers 400a from the range obtained by combining the 1 st detection ranges 26 of all the 2 nd reader/writers 400b is defined as the 2 nd route 28. In other words, the 1 st route 27 and the 2 nd route 28, which are 2 transit routes, are set for the road 20 based on the 1 st detection range 26 of all the 1 st reader/writers 400a and the 1 st detection range 26 of all the 2 nd reader/writers 400 b. Fig. 8 shows the situation where the user 10 is on route 1 27.

That is, the 1 st route 27 and the 2 nd route 28 as 2 passing routes are set for the road 20 based on the 1 st detection threshold as one detection threshold.

When the user 10 carrying the RF tag 100 is located on the road 20, it is determined that the user 10 is located on the 1 st route 27 when the intensity of one or more radio waves transmitted from the 1 st reader/writer 400a and received by the RF tag 100 is equal to or greater than the 1 st detection threshold and the intensity of all radio waves transmitted from the 2 nd reader/writer 400b and received by the RF tag 100 is less than the 1 st detection threshold, and it is determined that the user 10 is located on the 2 nd route 28 when the intensity of all radio waves transmitted from the 1 st reader/writer 400a and received by the RF tag 100 is less than the 1 st detection threshold and the intensity of one or more radio waves transmitted from the 2 nd reader/writer 400b and received by the RF tag 100 is equal to or greater than the 1 st detection threshold.

When the user 10 passes through the road 20, the passing route where the user 10 is located changes with the passage of time, and when the number of times the user 10 moves from one route to the other route of the 1 st route 27 and the 2 nd route 28, that is, the number of times the user moves is equal to or greater than the meandering threshold value, it is determined that the user 10 passes through the road 20 while meandering, and when the number of times the user moves is less than the meandering threshold value, it is determined that the user 10 passes through the road 20 without meandering. In fig. 8, the route movement number of the passing route of the user 10 is 4. At this time, if the meandering threshold value is 4 or less, it is determined that the user 10 is going to meander on the road 20, and if the meandering threshold value is greater than 4, it is determined that the user 10 is going to pass on the road 20 without meandering.

Next, the hardware configuration of the traffic management device 2 will be described with reference to fig. 9. Fig. 9 is a block diagram of a traffic management device according to embodiment 2 of the present invention. As shown in fig. 9, the traffic management device 2 includes an RF tag 100, a reader/writer 400, and a host device 500. Hereinafter, the RF tag 100, the reader/writer 400, and the host apparatus 500 will be described in order.

The reader/writer 400 includes a storage unit 410, a 1 st communication unit 420, a reception intensity comparing unit 430, and a 2 nd communication unit 440. The storage unit 410 stores the unique reader/writer identification information and the 1 st detection threshold. The 1 st communication part 420 modulates data into a communication signal and transmits it by radio waves, and demodulates a communication signal received by radio waves into data. The reception intensity comparing unit 430 compares the reception intensity measured by the reception intensity measuring unit 130 with the 1 st detection threshold stored in the storage unit 410. The 2 nd communication unit 440 modulates data into a communication signal and transmits the communication signal to the higher-level device 500. The communication signal transmitted from the 2 nd communication unit 440 to the upper apparatus 500 may be wired or wireless.

The host device 500 includes a communication unit 510, a storage unit 520, a route determination unit 530, a movement number counting unit 540, a meandering determination unit 550, and a notification unit 560. The communication unit 510 demodulates a communication signal received from the reader/writer 400 into data. The storage unit 520 stores user setting information in which tag identification information, user identification information of the user 10, and a meandering threshold value are associated with each other, and detection information, which will be described later, received by the communication unit 510 from the reader/writer 400. The route determination section 530 determines whether the user 10 is located on the 1 st route 27 and whether the user 10 is located on the 2 nd route 28. The movement number counting unit 540 counts the number of times the user 10 moves from one of the 1 st route 27 and the 2 nd route 28 to the other route, that is, the route movement number. The meandering determination unit 550 determines whether the user 10 is passing in a meandering manner or not in the road 20. When the meandering determination unit 550 determines that the user 10 has traveled the road 20 while meandering, the notification unit 560 notifies.

Next, a flow of the traffic control device 2 determining the meandering of the user 10 who passes through the road 20 will be described with reference to fig. 10. Fig. 10 is a flowchart showing the operation of the traffic management device according to embodiment 2 of the present invention. The operations of the RF tag 100, the reader/writer 400, and the host device 500 included in the traffic management device 2 will be described in order below.

First, the operation of the RF tag 100 will be described in order. When the RF tag 100 carried by the user 10 comes within a communicable range of the reader/writer 400, the communication unit 120 receives an inquiry radio wave, which is a radio wave including reader/writer identification information transmitted from the reader/writer 400 (S111 in fig. 10). The reception intensity measuring unit 130 measures the reception intensity of the inquiry radio wave received by the communication unit 120 (S112 in fig. 10). The communication unit 120 transmits a response radio wave including response information in which the reception time, which is the time when the communication unit 120 receives the inquiry radio wave, the reception intensity of the inquiry radio wave measured by the reception intensity measuring unit 130, the reader/writer identification information included in the inquiry radio wave received by the communication unit 120, and the tag identification information stored in the storage unit 110 are associated with each other (S113 in fig. 10).

Next, the operation of the reader/writer 400 will be described in order. The 1 st communication unit 420 transmits an inquiry radio wave as a radio wave including the reader/writer identification information stored in the storage unit 410 (S401 in fig. 10). When the 1 st communication unit 420 receives a response wave including the same reader/writer identification information as the reader/writer identification information stored in the storage unit 410, the reception intensity comparison unit 430 starts comparison (S402 in fig. 10). The reception intensity comparing unit 430 compares whether or not the reception intensity included in the response radio wave received by the 1 st communication unit 420 is equal to or greater than the 1 st detection threshold stored in the storage unit 410 (S403 in fig. 10). The 2 nd communication unit 440 transmits to the host device 500 a detection signal including detection information in which tag identification information included in the response radio wave received by the 1 st communication unit 420, the reception time and the reception intensity, and the reader/writer identification information stored in the storage unit 410 are associated with the result of comparison by the reception intensity comparison unit 430 (S404 in fig. 10).

Finally, the operation of the host apparatus 500 will be described in order. The communication unit 510 receives the detection signal transmitted from the reader/writer 400 (S501 in fig. 10). Storage unit 520 stores detection information included in the detection signal received by communication unit 510. The route determination unit 530 starts the determination every time a route determination period described later elapses (S502 in fig. 10). Among the detection information stored in the storage unit 520, including the tag identification information of the RF tag 100 carried by the user 10 and the detection information corresponding to the reception time in the route determination period described later, one or more reception intensities of the reader/writer identification information associated with the reader/writer 400a are equal to or higher than the 1 st detection threshold, and the overall reception intensity of the reader/writer identification information associated with the reader/writer 400b is smaller than the 1 st detection threshold, the route determination unit 530 determines that the user 10 is located on the 1 st route 27, and further, when the overall reception intensity of the reader/writer identification information associated with the reader/writer 400a is smaller than the 1 st detection threshold, and the total reception intensity of the reader/writer identification information associated with the reader/writer 400b is equal to or higher than the 1 st detection threshold, the route determination unit 530 determines that the user 10 is located on the 2 nd route 28 (S503 in fig. 10). When the route determination unit 530 determines that the user 10 is located on the traffic route and the traffic route determined this time is different from the traffic route determined last time, the travel number counting unit 540 counts the number of times the user 10 has traveled the route by adding 1 (S504 in fig. 10). When the number of times of route movement of the user 10 counted by the movement number counting unit 540 is equal to or greater than the meandering threshold value of the user 10 stored in the storage unit 520, the meandering determination unit 550 determines that the user 10 makes a meandering passage on the road 20, and when the number of times of route movement of the user 10 counted by the movement number counting unit 540 is smaller than the meandering threshold value of the user 10 stored in the storage unit 520, the meandering determination unit 550 determines that the user 10 makes a non-meandering passage on the road 20 (S505 in fig. 10). When the meandering determination unit 550 determines that the user 10 has traveled the road 20 while meandering, the notification unit 560 notifies (S506 in fig. 10). The meandering determination is continued by counting the number of times of the route movement until a meandering determination period (S507 in fig. 10) described later elapses, and the number of times of the route movement is initialized every time the meandering determination period described later elapses (S508 in fig. 10).

As described above, the traffic management device 2 determines the meandering of the user 10 who passes through the road 20.

The route determination period is a sufficient time required until all the reader/writers 400 transmit the interrogation radio wave, the RF tag 100 transmits the response radio wave to all the received interrogation radio waves, all the reader/writers 400 that receive the response radio wave transmit the detection signal, and the route determination unit 530 performs the determination based on all the detection signals received by the host device 500.

The meandering determination period is a time obtained by multiplying at least a time obtained by adding a sufficient time required from the determination by the route determination unit 530 to the determination by the meandering determination unit 550 by a value obtained by adding 1 to the meandering threshold value. Note that, the meandering determination period may be ended when all the reader/writers 400 do not receive the response wave from the RF tag 100 during the route determination period, and the meandering determination period may be started when any of the reader/writers 400 receives the response wave from the RF tag 100.

According to the traffic management device of embodiment 2 of the present invention, by measuring the intensity of radio waves transmitted from the plurality of readers/writers 400 arranged on one side and the other side of the road 20 in the traffic direction and received by the RF tag 100 carried by the user 10, it is possible to determine whether the user 10 is passing on the road 20 with meandering or without meandering, as in embodiment 1.

Further, the host device 300 can notify the administrator 11 by notifying the user 10 of the winding of the road 20, as in embodiment 1.

Further, according to the traffic management device of embodiment 2 of the present invention, since the 1 st reader/writer 400a detects that the user 10 carrying the RF tag 100 is located on the 1 st route 27 and the 2 nd reader/writer 400b detects that the user 10 carrying the RF tag 100 is located on the 2 nd route 28, the wider the road 20 is, the more suitable the determination of meandering is compared with the traffic management device of embodiment 1.

Here, although the RF tag 100 has the reception intensity measuring unit 130 to measure the reception intensity of the interrogation radio wave in

embodiments

1 and 2, the reader/writer 200 or the reader/writer 400 may have a reception intensity measuring unit to measure the reception intensity of the response radio wave. In this case, the time from when the reader/

writer

200 or 400 transmits the interrogation radio wave to when the reception intensity is determined can be shortened.

In

embodiments

1 and 2, the reader/writer 200 or the reader/writer 400 stores reader/writer identification information and a detection threshold, and the detection threshold can be set individually for each reader/writer 200 or the reader/writer 400, so that a traffic route that matches the width of the road 20 can be set on the road 20 having an irregular width.

For example, fig. 11 and 12 show a case where the traffic management device 1 is applied to a road 20 whose width is not fixed. Fig. 11 and 12 are plan views of roads to which the traffic control device according to embodiment 1 of the present invention is applied.

In fig. 11, by increasing the 1 st detection threshold and the 2 nd detection threshold of the reader/writer 200 provided in the narrow portion of the road 20 with respect to the reader/writer 200 provided in the wide portion of the road 20, the 1 st detection range 21, the 2 nd detection range 22, and the 3 rd detection range 23 of the reader/writer 200 provided in the narrow portion of the road 20 can be reduced with respect to the reader/writer 200 provided in the wide portion of the road 20. Thus, in fig. 12, the ratio of the 1 st route and the 2 nd route can be equalized between the narrow width portion of the road 20 and the wide width portion of the road 20, and therefore, the meandering of the user 10 can be detected with high accuracy.

In addition, in embodiment 1 and embodiment 2, since the detection threshold can be set individually for each reader/

writer

200 or 400, the detection range of the reader/

writer

200 or 400 can be set easily.

For example, when the 1 st detection range 21 is set in the traffic control device 1, the intensity of the radio wave transmitted from the reader/

writer

200 or 400 in which the 1 st detection range 21 is set is measured at a position to be a boundary between the 1 st detection range 21 and the 2 nd detection range 22, and the measured intensity of the radio wave is set as the 1 st detection threshold, whereby the 1 st detection range 21 can be easily set. Similarly, when setting the 2 nd detection range 22 and the 3 rd detection range 23, the intensity of the radio wave transmitted from the reader/

writer

200 or 400 that sets the 2 nd detection range 22 and the 3 rd detection range 23 is measured at a position that is intended to be the boundary between the 2 nd detection range 22 and the 3 rd detection range 23, and the measured intensity of the radio wave is set as the 2 nd detection threshold, whereby the 2 nd detection range 22 and the 3 rd detection range 23 can be easily set.

In

embodiments

1 and 2, since the host device 300 or the host device 500 stores tag identification information, user identification information, and meandering determination values in association with each other and can set the meandering determination value individually for the user 10, for example, when the RF tag 100 is carried by the manager 11, security guard of a facility, or cleaning person of a facility, the meandering threshold value can be increased for the manager 11, security guard of a facility, or cleaning person of a facility without being notified of meandering accompanying a normal operation.

In

embodiments

1 and 2, it is not necessary to include reader/writer identification information in the inquiry radio wave and the response radio wave, and each reader/

writer

200 or 400 may receive the response radio wave including the reception intensity of the inquiry radio wave transmitted by itself. In this case, for example, each reader/

writer

200 or 400 transmits and receives a radio wave in a time-division manner, and thereby each reader/

writer

200 or 400 can receive a response radio wave including the reception intensity of the inquiry radio wave transmitted by itself.

Although the reader/writer 200 and the reader/writer 400 are provided on the road 20 in embodiment 1, the reader/writer 200 and the reader/writer 400 may be provided not only on the wall, ceiling, or floor of the road 20 but also on the road 20 so as to transmit the inquiry radio wave to the road 20 and receive the response radio wave transmitted from the RF tag 100 carried by the user 10 who is located on the road 20.

Further, although the reader/writer 200 is arranged on one side of the road 20 in embodiment 1 and the reader/writer 200 is arranged on one side and the other side of the road 20 in embodiment 2, the reader/writer 200 and the reader/writer 4000 may be arranged in a plurality of rows on the road 20 as long as they are arranged so as to be able to transmit an inquiry radio wave over the entire length of the road 20 and to receive a response radio wave transmitted from the RF tag 100 carried by the user 10 located on the road 20.

Although embodiment 2 shows a case where the 1 st detection range of the reader/writer 400a is separated from the 1 st detection range of the reader/writer 400b, the 1 st detection range of the reader/writer 400a and the 1 st detection range of the reader/writer 400b may overlap with each other. Fig. 13 and 14 show plan views of the road 20 in this case. Fig. 13 and 14 are plan views of roads to which the traffic control device according to embodiment 2 of the present invention is applied. Fig. 13 shows the 1 st detection range 26 as one detection range of the reader/writer 400 nearest to the user 10. Fig. 14 shows a 1 st traffic route 27 and a 2 nd traffic route 28 as 2 traffic routes of the road 20.

In this case, as in embodiment 2, the 1 st route 27 is a range in which the 1 st detection ranges 26 of all the 2 nd reader/writers 400b are removed from a range in which the 1 st detection ranges 26 of all the 1 st reader/writers 400a are combined, and the 2 nd route 28 is a range in which the 1 st detection ranges 26 of all the 1 st reader/writers 400a are removed from a range in which the 1 st detection ranges 26 of all the 2 nd reader/writers 400b are combined.

Embodiment 3

An RF tag according to embodiment 3 of the present invention will be described with reference to the drawings.

In fig. 15, the traffic management device 3 is a traffic management device as follows: when a user 10 carrying an RF tag 600 passes through a road 20, the RF tag 600 determines whether the user 10 passes through the road 20 while meandering or without meandering, based on the intensity of radio waves transmitted from the reader/writer 700 and received by the RF tag 100, and the road 20 includes a plurality of readers/writers 700 arranged in the direction of passage. The RF tag 600 and the reader/writer 700 provided in the traffic management device 3 will be described in order.

In the traffic control device 3, the 2 traffic routes provided on the road 20 and the determination of meandering of the user 10 traveling on the road 20 are the same as those in

embodiments

1 and 2, and therefore, the description thereof is omitted. As shown in embodiment 1 and

embodiment

2, 2 traffic routes are set for the road 20 based on the reception intensity of the interrogation radio wave transmitted by the reader/writer 700 and received by the RF tag 600 and the detection threshold, and it is determined whether or not the user 10 is located in each of the 2 traffic routes.

The RF tag 600 includes a communication unit 610, a reception intensity measuring unit 620, a reception intensity comparing unit 630, a storage unit 640, a route determining unit 650, a number-of-movement counting unit 660, a meandering determining unit 670, and a notification unit 680. The communication section 610 modulates data into a communication signal and transmits it by electric waves, and demodulates the communication signal received by electric waves into data. The reception intensity measuring unit 620 measures the reception intensity, which is the intensity of the received radio wave. The reception intensity comparing unit 630 compares the reception intensity measured by the reception intensity measuring unit 620 with the detection threshold stored in the storage unit 640. The storage unit 640 stores reader/writer setting information, detection information, and a meandering threshold value, which are obtained by associating unique reader/writer identification information with a detection threshold value, the detection information associating reader/writer identification information included in an interrogation radio wave described later received by the communication unit 610, a reception time, which is a time when the interrogation radio wave described later is received by the communication unit 610, a reception intensity of the interrogation radio wave described later measured by the reception intensity measurement unit 620, and a result of comparison by the reception intensity comparison unit 630. The route determination section 650 determines whether the user 10 is located in each of the 2 transit routes. The movement number counting unit 660 counts the number of times the user 10 moves from one route to another route among the 2 traffic routes, that is, the route movement number. The meandering determination unit 670 determines whether the user 10 is passing in a meandering manner or not in the road 20. When the meandering determination unit 670 determines that the user 10 has traveled the road 20 while meandering, the notification unit 680 notifies the user.

The reader/writer 700 includes a storage unit 710 and a communication unit 720. The storage unit 710 stores unique reader/writer identification information. The communication section 720 modulates data into a communication signal and transmits it by electric waves, and demodulates the communication signal received by electric waves into data.

Next, a flow of the traffic management device 3 determining the meandering of the user 10 who passes through the road 20 will be described with reference to fig. 16. Fig. 16 is a flowchart showing the operation of the traffic management device to which the RF tag according to embodiment 3 of the present invention is applied. The operations of the RF tag 600 and the reader/writer 700 provided in the traffic management device 3 will be described in order below.

First, the operation of the RF tag 600 will be described in order. When the RF tag 600 carried by the user 10 comes within a communicable range of the reader/writer 700, the communication unit 610 receives an inquiry radio wave, which is a radio wave including reader/writer identification information transmitted from the reader/writer 700 (S601 in fig. 16). The reception intensity measuring unit 620 measures the reception intensity of the inquiry radio wave received by the communication unit 610 (S602 in fig. 16). The reception intensity comparing unit 630 compares the reception intensity measured by the reception intensity measuring unit 620 with the detection threshold stored in the storage unit 640 (S603 in fig. 16). The route determination unit 650 starts the determination every time a route determination period described later elapses (S604 in fig. 16). The route determination unit 650 determines whether or not the user 10 is located in each of the 2 traffic routes, among the detection information stored in the storage unit 640, which includes the reception time corresponding to the route determination period described later (S605 in fig. 16). When the route determination unit 650 determines that the user 10 is located on the traffic route and the traffic route determined this time is different from the traffic route determined last time, the number-of-movement count unit 660 counts the number of times the user 10 has moved the route by adding 1 (S606 in fig. 16). When the number of times of route movement of the user 10 counted by the number-of-movement counting unit 660 is equal to or greater than the meandering threshold value stored in the storage unit 640, the meandering determination unit 670 determines that the user 10 makes a meandering passage on the road 20, and when the number of times of route movement of the user 10 counted by the number-of-movement counting unit 660 is smaller than the meandering threshold value stored in the storage unit 640, the meandering determination unit 670 determines that the user 10 makes a non-meandering passage on the road 20 (S607 in fig. 16). When the meandering determination unit 670 determines that the user 10 has traveled the road 20 while meandering, the notification unit 680 notifies (S608 in fig. 16). The meandering determination is continued by counting the number of times of the route movement until a meandering determination period (S609 in fig. 16) described later elapses, and the number of times of the route movement is initialized every time the meandering determination period described later elapses (S610 in fig. 16).

Next, the operation of the reader/writer 700 will be described. The communication unit 720 transmits an inquiry radio wave as a radio wave including the reader/writer identification information stored in the storage unit 710 (S701 in fig. 16).

As described above, in the traffic management device 3, the RF tag 600 determines the meandering of the user 10 who passes through the road 20.

The route determination period is a sufficient time required until all the reader/writers 700 transmit the inquiry radio waves and the route determination unit 650 determines from all the inquiry radio waves received by the RF tag 600.

The meandering determination period is a time obtained by multiplying at least a time obtained by adding a sufficient time required from the determination by the route determination unit 650 to the determination by the meandering determination unit 670 by a value obtained by adding 1 to the meandering threshold value. Note that, the meandering determination period may be ended when the RF tag 600 does not receive the interrogation electric wave from all the readers/writers 700 during the route determination period, and the meandering determination period may be started when the RF tag 600 receives the interrogation electric wave from any of the readers/writers 700.

According to the RF tag of embodiment 3 of the present invention, by measuring the reception intensity of the interrogation radio waves transmitted and received from the plurality of readers/writers 700 arranged in the traffic direction of the road 20, it is possible to determine whether the user 10 is passing through the road 20 with or without meandering.

Further, RF tag 600 notifies user 10 of winding in road 20, thereby being able to notify user 10 and people located around user 10.

Further, since the RF tag 600 receives the inquiry radio wave transmitted from the reader/writer 700 and detects and notifies the user 10 of the meandering, it can be easily applied to the existing traffic management system.

Further, since the RF tag 600 stores the reader/writer identification information in association with the detection threshold and can set the detection threshold individually for each reader/writer 700, a traffic route that matches the width of the road 20 can be set on a road 20 having an irregular width, as in

embodiments

1 and 2.

Since the RF tag 600 can set the detection threshold individually for each reader/writer 700, the detection range of the reader/writer 700 can be easily set as in

embodiments

1 and 2.

Further, since the RF tag 600 stores the meandering determination value and the meandering determination value can be individually set for the plurality of RF tags 600, for example, when the manager 11, the security guard of the facility, or the cleaning person of the facility carries the RF tag 600, the meandering threshold value can be increased for the manager 11, the security guard of the facility, or the cleaning person of the facility without notifying the meandering accompanying the normal operation.

Description of the reference symbols

1: a traffic management device; 2: a traffic management device; 3: a traffic management device; 10: a user; 11: a manager; 20: a road; 21: 1, detection range; 22: the 2 nd detection range; 23: a 3 rd detection range; 24: route 1; 25: route 2; 26: 1, detection range; 27: route 1; 28: route 2; 100: an RF tag; 110: a storage unit; 120: a communication unit; 130: a reception intensity measuring section; 200: a reader/writer; 210: a storage unit; 220: a 1 st communication unit; 230: a reception intensity comparing unit; 240: a 2 nd communication unit; 300: a host device; 310: a communication unit; 320: a storage unit; 330: a route determination unit; 340: a moving number counting unit: 350: a meandering determination section; 360: a notification unit; 400: a reader/writer; 400 a: 1 st read-write machine; 400 b: a 2 nd reader/writer; 410: a storage unit; 420: a 1 st communication unit; 430: a reception intensity comparing unit; 440: a 2 nd communication unit; 500: a host device; 510: a communication unit; 520: a storage unit; 530: a route determination unit; 540: a moving number counting unit: 550: a meandering determination section; 560: a notification unit; 600: an RF tag; 610: a communication unit; 620: a reception intensity measuring section; 630: a reception intensity comparing unit; 640: a storage unit; 650: a route determination unit; 660: a moving number counting unit; 670: a meandering determination section; 680: a notification unit; 700: a reader/writer; 710: a storage unit; 720: a communication unit.

Claims

1. An access monitoring system, comprising:

an RF tag which is carried by a user and has inherent tag identification information;

more than 2N readers arranged in the passing direction of a road provided with a passing route of a 1 st route and a 2 nd route and having inherent reader identification information;

a reception intensity measuring unit that measures a reception intensity of the interrogation radio wave received by the RF tag from the reader/writer;

a route determination unit that determines whether the user is located on the 1 st route and whether the user is located on the 2 nd route, based on the tag identification information of the RF tag that receives the interrogation radio wave, the reader identification information of the reader/writer that transmitted the interrogation radio wave, and the reception intensity of the interrogation radio wave for each of the interrogation radio waves received by the RF tag during a predetermined route determination period; and

and a meandering determination unit that determines that the user has traveled meandering through the road when a number of times of route movement of the user from one of the 1 st route and the 2 nd route to the other route is equal to or more than a meandering threshold value within a predetermined meandering determination period, and determines that the user has traveled through the road without meandering when the number of times of route movement is less than the meandering threshold value.

2. Traffic monitoring system according to claim 1,

the reader/writer has a 1 st detection threshold and a 2 nd detection threshold as 2 detection thresholds, the 2 nd detection threshold being a value equal to or less than the 1 st detection threshold, and the reader/writer is provided with a 1 st detection range in which the reception intensity of the transmitted interrogation radio wave is equal to or more than the 1 st detection threshold, a 2 nd detection range which is smaller than the 1 st detection threshold and is equal to or more than the 2 nd detection threshold, and a 3 rd detection range which is smaller than the 2 nd detection threshold,

the 1 st route is a range obtained by combining the 1 st detection ranges of all the readers,

the 2 nd route is a range obtained by removing the 1 st detection range and the 2 nd detection range of all the readers from a range obtained by combining the 3 rd detection ranges of all the readers,

the route determination unit determines that the user is located on the 1 st route when the reception intensity of one or more of the inquiry radio waves transmitted by the reader/writer is equal to or greater than the 1 st detection threshold, and determines that the user is located on the 2 nd route when the reception intensities of all of the inquiry radio waves transmitted by the reader/writer are less than the 2 nd detection threshold.

3. Traffic monitoring system according to claim 1,

the reader/writer has a 1 st detection threshold as one detection threshold, and the reader/writer is provided with a 1 st detection range in which the reception intensity of the transmitted interrogation wave is equal to or higher than the 1 st detection threshold,

the N said readers are composed of M1 st readers and (N-M) 2 nd readers smaller than N,

the 1 st route is a range obtained by removing the 1 st detection range of all the 2 nd reader/writers from a range obtained by combining the 1 st detection ranges of all the 1 st reader/writers,

the 2 nd route is a range obtained by removing the 1 st detection range of all the 1 st reader/writers from a range obtained by combining the 1 st detection ranges of all the 2 nd reader/writers,

the route determination unit determines that the user is located on the 1 st route when the reception intensity of one or more of the interrogation radio waves transmitted by the 1 st reader/writer is equal to or greater than the 1 st detection threshold and the reception intensity of all of the interrogation radio waves transmitted by the 2 nd reader/writer is less than the 1 st detection threshold, and determines that the user is located on the 2 nd route when the reception intensity of all of the interrogation radio waves transmitted by the 1 st reader/writer is less than the 1 st detection threshold and the reception intensity of one or more of the interrogation radio waves transmitted by the 2 nd reader/writer is equal to or greater than the 1 st detection threshold.

4. Traffic monitoring system according to claim 2 or 3,

the detection threshold value is set separately in association with the reader-writer identification information,

the route determination unit compares the reception intensity of the inquiry electric wave with the detection threshold value associated with the reader-writer identification information of the reader-writer that has transmitted the inquiry electric wave.

5. Traffic monitoring system according to any one of claims 1 to 4,

the serpentine threshold value is set separately in association with the RF tag identification information,

the meandering determination section compares the route movement number with the meandering threshold value associated with the tag identification information of the RF tag to determine.

6. Traffic monitoring system according to any of claims 1-5,

the traffic monitoring system includes a notification unit configured to notify, when the meandering determination unit determines that the user has travelled through the road while meandering.

7. An RF tag which is carried by a user and has inherent tag identification information, the RF tag comprising:

a reception intensity measurement unit that measures reception intensities of inquiry radio waves received from N reader-writers, which are arranged in a traffic direction of a road on which a 1 st route and a 2 nd route are provided and have unique reader-writer identification information;

a route determination unit that determines whether the user is located on the 1 st route and whether the user is located on the 2 nd route, based on the reader-writer identification information of the reader-writer that transmitted the interrogation radio wave and the reception intensity of the interrogation radio wave for each of the interrogation radio waves received by the RF tag during a predetermined route determination period;

a meandering determination unit that determines that the user has traveled while meandering through the road when a number of times of route movement of the user from one route to the other route of the 1 st route and the 2 nd route is equal to or more than a meandering threshold value within a predetermined meandering determination period, and that determines that the user has traveled while not meandering through the road when the number of times of route movement is less than the meandering threshold value; and

and a notification unit configured to notify when the meandering determination unit determines that the user has traveled a meandering road.