JP5925468B2 - Moving object monitoring system - Google Patents

Description

  The present invention relates to a system for monitoring a moving object in a monitoring area.

  2. Description of the Related Art Conventionally, a system has been proposed in which a monitoring area is a building or its surrounding area, and a legitimate user in the area, such as a resident or employee, is accompanied by a portable device such as an IC tag. For example, when a person is detected in the monitoring area, it is determined whether or not the person is carrying a portable device based on a wireless signal emitted by the portable device, and whether or not the person is a legitimate user. Can be identified.

  In the security system shown in the following Patent Document 1, when the heat ray sensor detects a moving object in the security area, the identification number of the portable card carried by the employee is read, and the registered identification number cannot be read. In this case, the moving object is judged as an intruder and an abnormal alarm is issued.

Japanese Patent Laid-Open No. 11-144160

  When the heat ray sensor detects a person in the monitoring area, it cannot be determined whether or not the person really has the portable device simply by detecting the presence of the portable device in the monitoring area. In other words, if the detection range of people and mobile devices is as small as one person, it can be estimated that the detected person possesses the detected mobile device, but usually in and around buildings Since a wide monitoring area is used when monitoring an area, if the portable device exists at a position different from the detected person, the person is erroneously recognized as a regular user. Specifically, there are cases where a portable device exists in the surveillance area as a lost item, or when a regular user with a portable device coexists with a person who does not have a portable device. There is a possibility that identification and monitoring of a person in the monitoring area may not be performed with high accuracy.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to provide a moving object monitoring system that can accurately identify and monitor whether or not a moving object is associated with a portable device such as an IC tag. To do.

In order to achieve the above object, a moving object monitoring system of the present invention is a moving object monitoring system that monitors whether a moving object is associated with a portable device, and detects a moving object in a monitoring area by sensing. Object detection means for acquiring position information of a moving object, portable device detection means for receiving a radio signal emitted from the portable device and detecting position information of the portable device, position information of the moving object, and information on the portable device Correspondence determination means for associating the moving object with the portable device when the position information satisfies a predetermined coincidence criterion, and the correspondence determination means uses the coincidence criterion that differs according to the position information. And determining the association by using.
According to such a configuration, the higher the security level in the monitoring area, the stricter the matching criteria, the harder the correspondence between the moving object and the portable device can be made, and the high quality that combines convenience and safety. It can identify and monitor moving objects.

  In the above configuration, the correspondence determination unit determines that the matching criterion is satisfied at least when the amount of difference in position information between the moving object and the portable device is less than an allowable value, and according to the position information Different tolerances are used.

Further, in the above configuration, the monitoring area is set around an entry restriction area, and the correspondence determination unit sets the matching reference of the place near the entry restriction area in the monitoring area more strictly than a place far from the entry restriction area. To do.
Further, in the above configuration, the monitoring area is set around an entry restriction area, and the correspondence determination unit makes the coincidence criterion near the entrance of the entry restriction area stricter than the place far from the entrance.
According to such a configuration, since the strict association determination is performed in a situation where there is a high risk of entering the restricted area, the entering action caused by the suspicious object can be surely eliminated.

  In the above configuration, the specific information is further detected by tracking the position information of the moving object, and an abnormality is determined based on the presence / absence of association between the mobile object in which the specific action is detected and the portable device. An abnormality determination unit is included.

  According to the present invention, it is possible to identify a moving object that has both convenience and safety by making a joint determination based on the positional relationship between the moving object and the portable device and by making the determination criterion different according to the security level for each location.・ Can be monitored.

It is a schematic whole block diagram of the monitoring system of this embodiment. It is a typical top view of the monitoring area which shows the correspondence of a person and a wireless tag. It is a flowchart which shows the link process in a link process means. It is a flowchart which shows the link maintenance determination process in a link process means.

  Hereinafter, as an embodiment of a moving object monitoring system according to the present invention, a monitoring system that detects an suspicious person who has illegally entered a building site and issues an abnormal alarm will be described as an example.

  The monitoring system of this embodiment is applied to monitoring of a service user's house, for example. The garden corresponding to the site of the house is used as a monitoring area, and an abnormal alarm is issued by detecting the intrusion of a suspicious person into the monitoring area. The user is given a portable device in advance, and possesses the portable device when entering and leaving the house. The monitoring system detects a person who enters the monitoring area from outside the site, and obtains position information regarding the person. Further, the presence of the portable device is detected by receiving radio waves from the portable device, and the received wireless signal is analyzed to obtain position information regarding the portable device. Then, the position information related to the person and the position information related to the portable device are compared, and when the mutual positional relationship satisfies a predetermined matching criterion, the person is regarded as possessing the portable device. Recognize that there is. On the other hand, if the matching criterion is not satisfied, the detected person is recognized as a suspicious person who does not have a portable device, and an abnormality alarm is output for, for example, a staying action in a garden or an entering action in a building.

  Here, the position information is information indicating the location of a person or a portable device in the monitoring area, and the position and orientation in the monitoring area can be used. For example, when the monitoring area is represented by a two-dimensional polar coordinate system, a coordinate position (angle, distance) and direction (angle) can be adopted. In the monitoring system of the present embodiment, it is assumed that the orientation is used as the position information, and whether the person is carrying the portable device is determined based on the coincidence of the orientation.

  The direction detection of the portable device is specified by analyzing the arrival direction and reception intensity of the radio wave emitted by the portable device. However, since the arrival direction and reception intensity of radio waves are affected by various environmental factors such as reflection from walls, the orientation detection of the portable device includes unavoidable instability due to characteristics. Therefore, in determining the orientation matching between a person and a portable device, if a loose matching criterion is used to absorb instability, there is a possibility of allowing an intruder by a suspicious person, while a strict matching criterion is used. If used, a legitimate user may be erroneously determined as a suspicious person.

Therefore, in the monitoring system according to the present embodiment, orientation matching between a person and a portable device is determined using different matching criteria corresponding to each region in the monitoring area. In other words, a stricter matching criterion than other locations is used for a place with a high security level in the monitoring area where it is desired to reliably eliminate suspicious behavior. For example, a place with a high security level is an area adjacent to a house to be monitored, or an area surrounding a place that can be an entrance / exit of a house or an indoor intrusion route.
In this way, a monitoring system that combines convenience and security can be realized by changing the standard for determining the band according to the location.

Hereinafter, a specific configuration and operation of the monitoring system of the present embodiment will be described with reference to the drawings.
FIG. 1 is a schematic overall configuration diagram of the monitoring system of the present embodiment. The monitoring system mainly includes a sensor unit 10, a wireless tag 20, a reader unit 30, and a monitoring device 40, and uses a site around the building as a monitoring area. When a suspicious person who has entered the building site or the building is detected, the remote security center 60 is notified of the occurrence of an abnormality via a communication line 50 such as the Internet network. The security center 60 that has received the abnormality report implements emergency measures such as dispatching security personnel to the site. In addition, if a monitoring camera is provided with a separate camera (not shown) so that an image at the time of occurrence of an abnormality can be confirmed by the security center 60, the monitoring staff of the security center 60 can accurately grasp the situation at the site. .

  The sensor unit 10 has a function of detecting position information of a person in the monitoring area. In the present embodiment, a laser distance sensor is used as the sensor unit 10, the monitoring area is scanned with laser light, and the position of the object reflecting the laser light is detected. For example, a near-infrared laser light source with a wavelength of about 890 nm is provided, the laser pulse from the light source is reflected by a scanning mirror that is driven to rotate at a constant speed, the emission direction is changed, and the light is sequentially projected over the entire monitoring area. Shine. Further, the sensor unit 10 receives the laser pulse reflected by the object and generates distance measurement data up to the object. The scanning of the laser light is repeated at a predetermined cycle (for example, 200 milliseconds) with respect to an angle range (for example, 180 ° in the horizontal direction) where the monitoring area is desired centering on the sensor unit 10. The distance measurement is performed by using a time-of-flight method (TOF method: Time of Flight) at every predetermined angle step (for example, 0.25 °) within the scanning angle range. The time required to receive light is measured, and the distance to the object reflecting the laser beam is calculated from this time and the speed of light. The sensor unit 10 collects measurement distances for each scanning angle for one period, creates distance measurement data, and outputs the distance measurement data to the monitoring device 40.

  The sensor unit 10 is not limited to the laser distance sensor described above, and can be similarly configured with, for example, a radar sensor that uses radio waves such as microwaves and millimeter waves, and an ultrasonic sensor (sonar sensor) that transmits and receives ultrasonic waves. It is. In addition, by using an image sensor to extract a person based on background differences and inter-frame differences, obtain the azimuth of the person from horizontal coordinates on the image, and estimate the distance to the person from the vertical coordinates by inverse perspective transformation. Ranging data can also be generated. In this case, the image sensor is installed so as to photograph the monitoring area from obliquely above.

  The wireless tag 20 is a portable device that is given in advance to a user who is permitted to enter or leave the building, and is associated with the entry or exit of the building to be monitored. The wireless tag 20 performs wireless communication using radio waves with the reader unit 30 and transmits a wireless signal including unique identification information (hereinafter referred to as tag ID) for each wireless tag 20 stored in advance. . For the wireless communication system, RF-ID (Radio Frequency IDentification) technology is used. The usage frequency and driving method of the wireless tag 20 are not limited, but a frequency in the UHF band or 2.4 GHz band suitable for relatively long-distance communication is used for monitoring purposes in a building site. Further, in response to the interrogation signal from the reader unit 30, a semi-active type that transmits a response signal including a tag ID using its own battery as a drive source. Note that a vibration detection sensor may be provided in the wireless tag 20 and a wireless signal may be transmitted only during vibration detection, that is, during movement.

  The reader unit 30 is a tag reader that receives a wireless signal emitted from the wireless tag 20 and detects the wireless tag 10 that exists in a predetermined detection range. The detection range by the reader unit 30 is made to substantially coincide with the monitoring area. The reader unit 30 receives a response signal issued by the wireless tag 20 in response to the question signal transmitted to the monitoring area, and extracts a tag ID for identifying the wireless tag 20 included in the response signal.

  The reader unit 30 has a configuration for detecting the position information of the wireless tag 20 based on the question signal or the response signal. The monitoring device 40 detects the direction in which the wireless tag 20 is viewed from the reader unit 30 as position information of the wireless tag 20. As an example of a configuration for that purpose, the reader unit 30 includes a plurality of antennas each having a directivity with a relatively narrow beam width (for example, 10 °) and arranged so that the beam directions (directivity angles) are shifted from each other. The interrogation signal is transmitted and the response signal is received while switching the plurality of antennas at regular time intervals. The reader unit 30 controls the directivity so that the transmission / reception is sequentially performed with respect to the detection target angle range (for example, 360 °) every predetermined period (for example, 200 milliseconds). Then, the reception intensity of the response signal from the wireless tag 20 is acquired for each directivity angle, and tag detection data in which the reception intensity for each direction for one cycle is collected for each tag ID is output to the monitoring device 40. That is, the tag detection data indicates the azimuth distribution of reception intensity for each wireless tag 20.

In the above-described example, the configuration in which the directivity angle is changed in steps corresponding to the beam width is shown. . In this case, the orientation of the wireless tag 20 can be detected with smaller accuracy.
Also, other configurations that can switch the directivity of the antenna can be used. For example, a configuration in which a single antenna having strong directivity in a certain direction is rotated to sequentially switch the directivity angle, or a configuration in which the directivity angle is switched by electronic control, such as a phased array antenna, can be employed. Moreover, it is good also as a structure which makes a transmission antenna and a receiving antenna another structure, and gives directivity to only one side.

  In addition, it is necessary to define in advance the relationship between the position indicated by the distance measurement data and the orientation indicated by the tag detection data for link processing in the monitoring device 40 described later. In the present embodiment, the reader unit 30 and the sensor unit 10 are arranged in the vicinity so that the respective visual axes substantially coincide, and the scanning angle of the sensor unit 10 and the directivity angle of the reader unit 30, that is, the angle in the distance measurement data. The (azimuth) and the angle (azimuth) in the tag detection data are adjusted in advance so that they can be expressed in a common coordinate system. Preferably, the reader unit 30 and the sensor unit 10 are arranged in the same casing.

  In the monitoring system according to the present embodiment, the distance measuring sensor 10 and the reader unit 30 are configured. However, the distance measuring sensor 10 and the reader unit 30 are used in accordance with the shape of the region to be monitored. . For example, in the case of monitoring four surfaces around a building, at least two sets of distance measuring sensors and reader units are provided on the diagonal in the site. When installing on the wall of a building, a total of four distance measuring sensors and reader units are installed on each surface.

The monitoring device 40 is connected to the sensor unit 10 and the reader unit 30 wirelessly or by wire, and inputs the distance measurement data sent from the sensor unit 10 and the tag detection data sent from the reader unit 30 to execute monitoring processing. When an abnormality is detected, the remote security center 60 is notified of the abnormality.
The monitoring device 40 mainly includes a storage unit 42, a notification unit 44, a notification unit 46, and a monitoring processing unit 48.

  The storage unit 42 includes a ROM, a RAM, and the like, and stores various programs executed by the monitoring processing unit 48 and data necessary for the programs. The storage unit 42 also includes information on the tag ID of the wireless tag 20 (registered tag data) given to the user in advance, and distance measurement data (reference data) obtained by the sensor unit 10 scanning the monitoring area in the absence of a moving object. Ranging data) is stored. Further, tracking data for managing the behavior (movement trajectory etc.) for each detected person is stored. The tracking data is created, updated, and deleted as needed by the monitoring processing unit 48.

  The storage unit 42 stores map information related to the monitoring area. The map information includes information representing the entire area of the monitoring area and information representing an area (hereinafter referred to as an important area) in which the security level is set higher than the others in the monitoring area. In the important area, a place where the action of a person who does not carry the wireless tag 20 is strongly desired to be excluded is set. For example, an area within a certain distance from the monitored building boundary or an area near the entrance of the building in the boundary of the monitoring area is a place immediately before the suspicious person enters the building, so the security level is higher than other places. It is an important area to be. The location and shape of the important area are not limited to the above, and an arbitrary area within the monitoring area can be set.

The reporting unit 44 is a communication interface for communicating with the security center 60 via the communication line 50 and transmitting various data such as an abnormality signal.
The notification unit 46 includes a buzzer, a speaker, a warning lamp, and the like, and is a means for notifying the surroundings that an abnormality has occurred and threatening a suspicious person. The notification unit 46 may be provided separately from the monitoring device 40 and the sensor unit 10 and the reader unit 30.

  The monitoring processing unit 48 is configured using a microprocessor or the like, and performs monitoring processing based on distance measurement data input from the sensor unit 10 and tag detection data input from the reader unit 30 according to a program to be executed. Do. Specifically, the monitoring processing unit 48 includes a person detection unit 480, a tag detection unit 482, a tracking processing unit 484, a link processing unit 486, and an abnormality determination unit 488 as execution programs.

  The person detection unit 480, together with the sensor unit 10, constitutes an object detection unit that detects position information of a person in the monitoring area. The person detection unit 480 compares the distance measurement data input from the sensor unit 10 with the reference distance measurement data in the storage unit 42, and is equivalent to the extent that the distance indicates the same object. A group of scanning angles (distance change group) in which a change in distance of at least a predetermined amount is generated is extracted. Then, when the size of the moving object grasped from the distance and the angle range in the distance change group is about a person, the moving object is recognized as a person, and the azimuth and distance at which the person is detected are determined as the position of the person. And Specifically, the human detection data is generated with the central angle of the angle range of the distance change group indicating the person as the detection direction of the person (person direction) and the average of the distances within the angle range as the distance to the person. When a plurality of distance change groups are extracted from the distance measurement data, person determination and position detection are performed for each group. In addition, instead of the average distance value within the angle range forming the distance change group, other representative values such as the central angle distance and the median value may be used as the person distance.

  The tag detection unit 482, together with the reader unit 30, constitutes a portable device detection unit that detects position information of the wireless tag 20 in the monitoring area. The tag detection means 482 inputs the tag detection data for one cycle input from the reader unit 30, and determines whether each detected tag ID is a tag ID registered in advance with reference to the registered tag ID. In the case of a registered tag ID, the azimuth distribution of the received intensity related to the tag ID is analyzed, and the peak directivity angle with the highest received intensity is set as the detection direction (tag azimuth) of the wireless tag. Since the directivity angle has a certain angle range, the central angle of the peak directivity angle is used for the tag orientation. As for the method for detecting the direction of a wireless tag, for example, a method for obtaining the tag direction by comparing the pattern of the distribution of received intensity with a reference pattern, or the peak directivity angle at which the received intensity is the maximum is received in other directions. It is possible to use a known technique such as a correction method in relation to the above.

  The tracking processing unit 484 sequentially processes the human detection data generated by the person detecting unit 480, and records and accumulates position changes for each person in the storage unit 42 as tracking data. The tracking processing means 484 assigns a person ID to each person to be tracked and creates / updates tracking data. The tracking data is data in which a person ID, a person detection position (angle, distance), link information, and time stamp information (detection time) are associated. The link information includes the tag ID of the wireless tag and the tag orientation (angle) of the wireless tag associated with each other by a link processing unit 486 described later.

  The tracking processing unit 484 compares the detected person with the previously detected person, and the difference in size and position is small, or the movement speed derived from the movement distance and elapsed time of the person is equal to or less than a predetermined speed. It is determined whether or not both are the same person. If the person has not been detected or is not the same person last time, it is recognized as the person who first appeared in the monitoring area, and a person ID is assigned to this person to create tracking data relating to the person ID. If they are the same person, it is determined that the person is already being tracked, and the tracking data relating to the person ID assigned to the person is updated. If the person being tracked is not detected for a certain period of time, the person is deemed to have left the monitoring area and the tracking process is terminated. The tracking data is retained for a certain period after the tracking is completed.

  The link processing unit 486 collates the position information detected by the person detection unit 480 with the position information of the wireless tag 20 detected by the tag detection unit 482, and performs a link process for associating the person with the wireless tag 20. It functions as a correspondence determination means to be performed. In this embodiment, when a person is detected by the person detecting means 480, the link processing means 486 compares the tag orientation of the wireless tag 20 detected at the same time with the person orientation, and the degree of match is a predetermined match. If the standard is satisfied, that is, if the amount of difference in the angle between the azimuth of the person and the tag azimuth (azimuth deviation) is less than the predetermined standard, the person is associated with the wireless tag 20 (link establishment). On the other hand, when the amount of azimuth deviation is equal to or greater than a predetermined reference and no coincidence is recognized or when the wireless tag 20 is not detected, no association is made (link failure). In determining the orientation consistency, the link processing unit 486 determines whether or not the detected person's position is included in the important area. Set. That is, the person in the important area is less likely to be associated with the wireless tag 20 than the person outside the important area.

FIG. 2 is a schematic plan view of a monitoring area showing a correspondence relationship between a person and a wireless tag. In the example of FIG. 2, the inside of the site surrounded by the monitoring target building 300, the boundary 310 with the outside of the site, and the site entrance 320 is set as the monitoring area 330. The vicinity of the building entrance 340 of the building 300 is set as an important area 350 with a high security level.
For the person 100 at the point A that is not an important area, the detected orientation deviation θa with the wireless tag 200 is compared with a threshold value Th1, and if it is less than the threshold value Th1, the person 100 and the wireless tag 200 are associated with each other. On the other hand, the person 120 at the point B belonging to the important area is compared with the threshold Th2 that is smaller than the threshold Th1 with respect to the detected orientation deviation amount θb with the wireless tag 220. The wireless tag 220 is associated.

FIG. 3 is a schematic flowchart showing link processing in the link processing means. When a person is detected by the person detecting means 480, the link processing means 486 executes the following processing for each detected person.
The link processing means 486 determines whether the person to be processed is a person who is already being tracked or a newly appearing person (S400). If the person is being tracked, the link ID is established for the person ID. That is, it is determined whether it is associated with the wireless tag (S402). If it is a newly detected person (No in S400) or a person who is not in a link establishment state (No in S402), link setting is attempted for the person ID (S404 to S420).

  First, the link processing unit 486 determines whether or not a wireless tag is detected (S404), and if detected, determines whether or not the wireless tag is linked with another person (S406). If the tag ID of the detected wireless tag is not linked to another person ID (Yes in S406), the amount of azimuth misalignment between the person orientation of the person and the tag orientation of the wireless tag is calculated (S408). ). Further, it is determined whether or not the position of the person is included in the important area (S410), and a matching criterion used for determining the association between the person and the wireless tag is set according to the location of the person (S412 and 414). As described above, according to the example of FIG. 2, when matching is determined for the person 100 outside the important area 350, a normal matching criterion (threshold Th <b> 1) is set (S <b> 412), In the association determination for the person 120, a strict matching criterion (threshold Th2) is set (S414).

  Then, it is determined whether or not the azimuth deviation amount is less than the set threshold value (S416), and if it is less than the threshold value, the tag ID of the wireless tag is associated with the person ID related to the person to be processed. A link is set (S418). On the other hand, when an unlinked wireless tag is not detected in the monitoring area (No in S404, No in S406), or when the orientation deviation amount is equal to or greater than the threshold value and the consistency is not confirmed (No in S416), Since the link cannot be set or it is inappropriate to set, the link is not set for the person to be processed, and the process ends (S420). When a plurality of unlinked wireless tags are detected, the association determination is attempted from the wireless tag with the smallest amount of azimuth deviation, and the process ends if the link fails.

  When the person to be processed is being tracked and the link is established with the specific wireless tag (Yes in S402), the link processing unit 486 replaces the processes S404 to S420 when there is no link with the link maintenance determination. Processing is performed (S422). In the link maintenance determination process, the association determination is limited to the wireless tag associated with the person to be processed. Considering that the direction detection accuracy of the wireless tag has a relatively large error, for a pair of a person who has once set a link and the wireless tag 20, the link determination determination is relaxed and the link breaks frequently. Avoid situations that occur.

  FIG. 4 is a schematic flowchart showing link maintenance determination processing in the link processing means. The link processing unit 486 determines whether or not a wireless tag is detected (S500). If detected, the tag ID of the detected wireless tag includes the tag ID linked to the person ID to be processed. It is determined whether it is (S502). If a wireless tag associated with the person is detected, an azimuth shift amount between the person's orientation and the tag direction of the wireless tag is calculated (S504). Further, it is determined whether or not the position of the person is included in the important area (S506), and a matching criterion used for determining the association between the person and the wireless tag is set according to the location of the person (S508 and 510). Similar to the link setting process, the threshold value Th4 when the person detection position is inside the important area 350 is smaller than the threshold value Th3 when the person detection position is outside the important area 350, and the matching criterion is made stricter. In the link maintenance determination process, a criterion that is looser than the coincidence criterion at the time of initial link setting is set, the threshold value Th3 is set to a value larger than the threshold value Th1, and similarly, the threshold value Th4 is set to a value larger than the threshold value Th2.

  Then, it is determined whether or not the azimuth deviation amount is less than the set threshold value (S512). If it is less than the threshold value, it is determined that a link is established between the person to be processed and the wireless tag, and the correspondence between the two is established. Maintain (S516). On the other hand, when an unlinked wireless tag is not detected in the monitoring area (No in S500, No in S502), or when the azimuth deviation amount is equal to or greater than the threshold value and the consistency is not confirmed (No in S512), It is determined whether the link failure state has continued for a certain time (S514). If the link has failed for a certain period of time, the link setting with the wireless tag associated with the person is canceled (S518). Since there is a link setting, the link setting is maintained (S516).

  Returning to FIG. 1, the abnormality determination unit 488 of the monitoring processing unit 48 detects various determination target behaviors (events) based on the tracking data, and executes determination processing according to the type of the behavior. In particular, when detecting a specific action that requires an abnormal determination as to whether or not a person is a suspicious person, refer to the link information of the person and whether the person is carrying a wireless tag, that is, whether the person is a legitimate user It is determined whether or not there is an intrusion abnormality. In the present embodiment, an entrance event, an exit event, a stay event, an entrance event, and an exit event are defined as actions to be determined. Among these, the entrance event for detecting the intrusion action to the building, the entrance event for detecting the injustice in the premises, and the stay event are treated as specific actions that require abnormality determination.

The abnormality determination unit 488 monitors the position history in the tracking data of each person, and detects the determination target behavior based on the detected position of the person and the elapsed tracking time.
[Admission event]
As for the newly detected (new person ID), the case where the appearance position is a boundary with the outside of the site (the boundary 310 and the site entrance 320 in FIG. 2) is detected as an entrance event. When detecting an entrance event, the abnormality determination unit 488 determines whether or not a wireless tag is associated with the person. If the wireless tag 20 is associated, the person is determined to be an authorized user and entry is permitted. On the other hand, if the wireless tag 20 is not associated, it is determined whether or not the appearance position of the person is the site entrance 320. In the case of entrance from the site entrance 320, there is a possibility that the visitor is a visitor such as a customer or a delivery person. Therefore, an entrance permission for a certain period of time is set for the person ID (temporary permission setting), and a stay determination timer is set. to start. When entering from the boundary 310 other than the site entrance 320, it is determined that the suspicious person has entered, and an outer periphery intrusion abnormality is determined, an alarm operation by the notification unit 46, and an abnormality notification operation to the security center 60 via the notification unit 44. I do.

[Exit event]
A case where the person being tracked disappears from the monitoring area and the position immediately before that is the boundary with the outside of the site (the boundary 310 and the site entrance 320 in FIG. 2) is detected as an exit event. When detecting the exit event, the abnormality determination unit 488 ends the tracking of the person, and deletes the tracking data after a certain time. Note that the tracking data of the person determined to be abnormal during tracking is retained at least until the abnormality is recovered.

[Still event]
The case where the person being tracked with temporary permission set exists in the monitoring area for a certain time is detected as a staying event. The abnormality determination unit 488 detects a stay event when the stay determination timer completes a certain time, and determines whether or not the wireless tag is associated with the person. If the wireless tag 20 is not associated, it is highly likely that the person has an unauthorized purpose such as picking or hiding, so that the person is recognized as a suspicious person and the perimeter intrusion abnormality is determined.

[Entrance event]
A case where the person being tracked disappears from the monitoring area, and the position immediately before that is the boundary with the building to be monitored (building entrance 340 in FIG. 2) is detected as an entrance event. When the entrance determination event is detected, the abnormality determination unit 488 determines whether or not the wireless tag 20 is associated with the person immediately before that event. If the wireless tag 20 is associated, it is recognized as an admission act by a regular user and the tracking is ended. On the other hand, when the wireless tag 20 is not associated, it is assumed that the person has illegally entered the building, and the building entry abnormality with high urgency is determined. The abnormality determination means 488 notifies the security center of the abnormality by distinguishing that it is a building intrusion abnormality from the outer periphery intrusion abnormality.
Since the vicinity of the building entrance is set as an important area as described above, the link setting standards are stricter than other monitoring areas. Therefore, compared with the entrance event and the stay event, the user determination in the entrance event is made stricter, and unauthorized entry into the building can be surely eliminated.

  If there are intrusion routes such as windows other than the building entrance 340, they are preferably handled in the same manner as the building entrance. Further, all of the boundary portion with the building 300 including the building entrance 340 may be detected as an entrance event. In this case, an area having a certain width that forms a boundary with a building or the vicinity of an intrusion route such as a window is set as an important area.

  As described above, the monitoring system according to the present embodiment associates a person with a wireless tag based on the coincidence between the direction in which the person detected in the monitoring area exists and the direction in which the wireless tag exists. At this time, if the position of the detected person is included in an important area having a high security level, the qualification determination of the user is made stricter by tightening the criteria for matching. Therefore, it is possible to surely prevent a suspicious person who is not accompanied by a wireless tag from allowing an action with a high risk such as a building intrusion. Along with this, it is possible to suppress false alarms for actions with a relatively low risk by authorized users, and a high-quality monitoring system that combines convenience and security is provided.

In the above-described embodiment, the matching criterion is different in two steps inside and outside the important area. However, the present invention is not limited to this. For example, three or more levels of importance may be set for each of a plurality of areas, and different matching criteria may be set according to the importance.
Further, instead of a configuration in which the matching criterion is different for each area in the monitoring area, the matching criterion may be dynamically changed according to the distance from the building entrance or the distance from the boundary with the building. For example, the closer the distance from the building boundary, the stricter the matching criteria and the harder it is to set a link.

  In the above embodiment, the central angle of the angle range forming the distance change group is used as the person orientation. However, the angle range itself forming the distance change group may be the person orientation. In this case, the association is determined based on whether the detected tag orientation of the wireless tag is included in the person's angle range or whether the amount of deviation from the person's angle range is less than the threshold.

In the above embodiment, the center of the directivity angle of the reader when the wireless tag is detected is used as the tag orientation. However, the angle range of the directivity angle itself may be used as the tag orientation. In this case, the association is determined based on whether the angle indicating the person's azimuth is included in the angle range of the pointing angle at which the wireless tag is detected or whether the amount of deviation from the angle range of the pointing angle is less than the threshold value.
Furthermore, the angle range itself that forms the distance change group may be the person orientation, and the angle range of the directivity angle itself may be the tag orientation. In this case, the degree of overlap between the angular ranges is used as the amount of azimuth deviation, or if there is no overlap, the azimuth difference between the nearest ends may be used as the amount of azimuth deviation.

  Further, in the above-described embodiment, the configuration in which the coincidence between the detection direction of the person and the detection direction of the wireless tag is determined. However, the configuration in which the consistency between the detection position of the person and the detection position of the wireless tag is determined. Good. In this case, since it is necessary to specify the position in the monitoring area where the wireless tag exists, for example, the distance to the wireless tag using the reception strength of the response signal or the time difference from the transmission of the question signal to the reception of the response signal And the position of the wireless tag is calculated from the tag direction and the distance. Alternatively, it is possible to use a plurality of reader units whose detection ranges overlap each other, obtain a position where detection directions of wireless tags with the same tag ID in each reader unit intersect, and use this as the detection position of the wireless tag. When link processing is performed by determining the position consistency, the distance between them is used as a positional deviation amount and used instead of the azimuth deviation amount to determine the consistency.

  Further, in the above embodiment, the suspicious person determination is performed based on the presence or absence of the association when the specific action is detected. However, the link level indicating the likelihood of the association is set and set in advance according to the specific action. The suspicious person may be determined depending on whether or not the set reference level is satisfied. The link level is set by, for example, the continuity of the link establishment state, the magnitude of the azimuth deviation amount, the direction detection accuracy of the wireless tag, and the like. If the link establishment state is long, it can be said that the probability that the person has the wireless tag is high, so the link level is increased. Similarly, the link level is increased as the azimuth deviation amount is smaller or the azimuth detection accuracy of the wireless tag is higher. Of the specific actions, the admission event and the staying event are allowed to be higher than a relatively low link level, while the admission event is determined to be abnormal as a suspicious person unless the admission event is higher than the high link level. In this embodiment, the link level calculation method may be varied according to the security level for each location. For example, the important area is configured so that the link level is calculated to be lower than that of other areas even if the amount of heading deviation is the same.

10 range sensor, 20 wireless tag, 30 reader unit, 40 monitoring device, 42 storage unit, 44 reporting unit, 46 reporting unit, 48 monitoring processing unit, 50 communication line, 60 security center

Claims (5)

A moving object monitoring system for monitoring whether a moving object is accompanied by a portable device,
Object detection means for detecting a moving object in the monitoring area by sensing and acquiring position information of the moving object;
Portable device detection means for receiving a radio signal emitted by the portable device and detecting position information of the portable device;
Correspondence determination means for associating the moving object with the portable device when the position information of the moving object and the position information of the portable device satisfy a predetermined matching criterion;
The moving object monitoring system, wherein the correspondence determination unit performs the determination of the correspondence using the matching criterion that is different depending on the position information of the moving object. The correspondence determination unit determines that the matching criterion is satisfied at least when the difference amount of the positional information between the moving object and the portable device is less than an allowable value, and the allowable difference that differs depending on the positional information of the moving object The moving object monitoring system according to claim 1, wherein a value is used. The monitoring area is set around the restricted area,
3. The moving object monitoring system according to claim 1, wherein the correspondence determination unit makes the coincidence criterion of a place near the entry restriction area in the monitoring area stricter than a place far from the entry restriction area. The monitoring area is set around the restricted area,
3. The moving object monitoring system according to claim 1, wherein the correspondence determination unit makes the coincidence criterion of a place near the entrance of the entry restricted area stricter than a place far from the entrance. Furthermore, it has abnormality determination means for detecting a specific action by tracking position information of the moving object, and performing an abnormality determination based on the presence / absence of association between the mobile object in which the specific action is detected and the portable device. The moving object monitoring system according to claim 1.

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