JP5105100B2 - Intrusion detection system, alarm terminal, intruder detection method, program and recording medium - Google Patents

Description

  The present invention relates to an intrusion detection system, a wireless signal monitoring device, an alarm terminal, an intruder detection method, an intruder detection program, an intrusion determination program, and a program recording medium.

  There is an increasing demand for security enhancement in homes and businesses. Japanese Patent Application Laid-Open No. 2005-195470 “Intrusion Detection Device” in Japanese Patent Laid-Open No. 2005-195470 and Japanese Patent Application Laid-Open No. 2005-309671 “Intruder Detection System” in Japanese Patent For example, an intrusion detection system using infrared rays or radio waves that cannot be seen by an unauthorized intruder has been proposed, as disclosed in Japanese Patent Application Laid-Open No. 2008-16015 of "Patent Document 3". However, special transceivers had to be prepared for these systems.

  On the other hand, due to the spread of the Internet and the convenience of the wireless LAN system, wireless LAN devices using IEEE 802.11 technology are rapidly being introduced into homes and businesses, and wireless LAN access points are installed indoors. Examples are increasing. In the IEEE802.11 standard, which is a wireless LAN standard, a beacon signal (Beacon Signal) is affected by the radio wave environment due to multipath and fading caused by surrounding walls and fixtures, but is also affected by the human body. For example, when the human body crosses the radio wave area, the radio wave intensity of the beacon signal is reduced as described in Japanese Patent Application Laid-Open No. 2006-190053 “Indoor Intrusion Detection System and Indoor Intrusion Detection Information Transmission System” of Patent Document 4 and Patent Document 5. Japanese Patent Application Laid-Open No. 07-141577, “Indoor intruder detection device”, and the like, are also described in related art relating to a system for detecting an intruder.

Japanese Patent Laying-Open No. 2005-195470 (page 5-7) Japanese Patent Laying-Open No. 2005-309671 (page 5-7) Japanese Patent Laying-Open No. 2008-16015 (page 4-6) JP 2006-190053 A (page 5-6) JP 07-141577 A (page 2-4)

  As described above, as a method for monitoring whether or not a person is present, a method using infrared rays or radio waves is conventionally known.

  However, when an intruder is detected using infrared rays, there is a problem in that it cannot be determined whether or not a person has permission to enter the room.

  In addition, for the method of detecting intruders using radio waves, it is necessary to prepare a special transmitter / receiver. Furthermore, as in the case of infrared rays, it is impossible to determine whether a person has permission to enter the room. There is a problem.

  On the other hand, as described in Patent Document 4 and Patent Document 5, there is also an aspect in which the reception level of radio waves varies according to changes in the multipath environment of radio waves due to the presence of a moving human body.

  The present invention has been made in view of such circumstances, and whether or not there is a person who has entered the monitoring area simply by adding a new wireless signal monitoring device that measures the radio field intensity of the wireless signal at the access point of the wireless LAN. It is an object of the present invention to provide a mechanism that can easily detect whether or not the detected person is permitted to enter the monitoring area.

To attain the above object, intrusion detection system according to the present invention, alarm terminals, intruder detection method, intruder detection program, penetration capability judgment program and a program recording medium adopt characteristic configurations as follows is doing. Below (1), (6),及 Beauty (9) consisting numerals correspond respectively to item number of claims.

(1) In an intrusion detection system that detects that an intruder has entered a predetermined monitoring area, a wireless signal monitoring device that measures the radio field intensity of a wireless signal transmitted by a wireless LAN access point is provided in the monitoring area. The radio wave intensity of the radio signal from the access point measured by the radio signal monitoring device is detected at the position farthest from the access point and detects the presence of a person who has entered the monitoring area. When the radio field intensity falls below a predetermined radio field intensity threshold, it is determined that an intruder has entered the monitoring area, the radio signal monitoring apparatus is connected to a network, and the radio signal monitoring apparatus When an intruder intruding into the monitoring area is detected, the alarm terminal used by the administrator indicates that the intruder has been detected. When receiving a notification that an intruder has been detected from the wireless signal monitoring device, the alarm terminal accesses the access point via the network and enters the monitoring area. An intrusion detection system that acquires terminal information specific to a terminal carried by an intruder.
(6) When an alarm terminal that issues an alarm to an administrator that an intruder has entered a monitoring area predetermined as an area to be monitored is received, a notification that an intruder has entered the monitoring area. An alarm terminal that accesses an access point for a wireless LAN that covers the monitoring area as a wireless area via a network and acquires terminal information unique to a terminal carried by an intruder who has entered the monitoring area.
(9) An intruder detection method for detecting that an intruder has entered a predetermined monitoring area, the wireless signal monitoring device for measuring the radio field intensity of a wireless signal transmitted by a wireless LAN access point, The radio signal strength of the wireless signal from the access point measured by the wireless signal monitoring device is detected in the monitoring area and located farthest from the access point to detect the presence of a person who has entered the monitoring area. If the radio field intensity is lower than a predetermined radio field intensity threshold, it is determined that an intruder has entered the monitoring area, and the wireless signal monitoring device detects the intruder that has entered the monitoring area. The alarm terminal used by the administrator to detect that an intruder has been detected, and receive notification that the intruder has been detected from the wireless signal monitoring device. When the alarm terminal accesses the access point, entering the intruders to get a terminal unique terminal information carried in the monitoring area, intruder detection methods.

Intrusion detection system of the present invention, alarm terminals, intruder detection method, intruder detection program according to the penetration capability judgment program and a program recording medium, it is possible to achieve the following effects.

  As a first effect, a radio signal monitoring apparatus that uses a general-purpose wireless LAN access point used for normal data communication and monitors the radio wave intensity of a radio signal from the access point is provided in the monitoring area. When a person intrudes into the monitoring area simply by installing it, the human body can move within the monitoring area by taking advantage of the fact that the radio field strength decreases due to multipath and fading when the human body crosses the wireless area of the access point. It is possible to reliably detect whether or not the user has entered.

  As a second effect, a terminal such as a wireless LAN terminal or an RF tag is carried by a person who is permitted to enter, and a terminal that is permitted to carry in terminal information unique to the terminal is carried. By registering in advance as a database, it is possible to easily determine whether the intruder is a permitted intruder or an illegal intruder when an intruder in the monitoring area is detected. it can.

It is a schematic diagram for demonstrating an example of the system configuration | structure of the intrusion detection system by this invention. It is a flowchart which shows an example of operation | movement of the radio signal monitoring apparatus of the intrusion detection system shown in FIG. It is a flowchart which shows an example of operation | movement of the alarm terminal following the flowchart of FIG. 2 of operation | movement of the intrusion detection system shown in FIG.

  Preferred embodiments of an intrusion detection system, a radio signal monitoring device, an alarm terminal, an intruder detection method, an intruder detection program, an intrusion determination program, and a program recording medium according to the present invention will be described below with reference to the accompanying drawings. In the following description, the radio signal monitoring device, alarm terminal, and intruder detection method according to the present invention will be described. However, the intruder detection method is implemented as an intruder detection program or an intrusion determination program that can be executed by a computer. Needless to say, the intruder detection program and the intrusion determination program may be recorded on a computer-readable recording medium.

(Features of the present invention)
Prior to the description of the embodiments of the present invention, an outline of the features of the present invention will be described first. The present invention is characterized in that an intruder is detected by monitoring the radio field intensity of a radio signal emitted from a wireless LAN access point and detecting a decrease in radio field intensity when a person passes around. . In general, radio signals are affected by the radio wave environment due to multipath and fading due to surrounding walls and fixtures. However, as described above, the radio signal strength also decreases when the human body moves in a radio area. It is possible to detect whether or not a person has passed by using this.

  Further, for a person who allows intrusion, by carrying an RF (Radio Frequency) tag or a wireless LAN terminal when passing through a wireless area, the terminal information obtained from the RF tag or the wireless LAN terminal and the radio field intensity of the wireless signal are obtained. By combining with a decrease in the number, it is possible to determine whether or not a person permitted to enter is passing.

  Specifically, the present invention additionally arranges a radio signal monitoring device for detecting the radio wave intensity of a radio wave in an area predetermined as a monitoring area in a radio area where radio waves of a wireless LAN access point reach. With this, it is possible to detect whether or not a person is present in the vicinity. Here, the radio signal monitoring device may be anything as long as it can monitor the radio wave intensity of the radio signal emitted from the access point, and may be an inexpensive general-purpose product. For example, in the case of a wireless LAN, a PC (Personal Computer) in which software for wireless LAN monitoring and a wireless LAN module are installed may be used.

  In addition, when a wireless LAN access point is used as a wireless signal for detecting an intruder, terminal information unique to the terminal such as a wireless LAN terminal or a MAC address of an RF tag is connected to the network in advance for a person who allows intrusion. By registering a database in a terminal management server, when a person is detected by a wireless signal, terminal information such as a wireless LAN terminal or an RF tag carried by the person is acquired to manage the terminal. If it is confirmed by the server, it can be determined whether or not the person is allowed to enter.

(Configuration example of embodiment)
Next, an example of the configuration of the intrusion detection system according to the present invention will be described with reference to FIG. FIG. 1 is a schematic diagram for explaining an example of a system configuration of an intrusion detection system according to the present invention. Hereinafter, an example in which a wireless LAN beacon signal defined in the IEEE 802.11 standard is used as a wireless signal used to detect an intruder will be described.

  In FIG. 1, an access point 101 is a wireless LAN access point that can also be used for normal data communication, and is installed indoors 100. The access point 101 outputs a radio signal 102 defined by the IEEE 802.11 standard as a beacon signal with a predetermined predetermined radio wave intensity.

  Similar to the access point 101, the wireless signal monitoring device 105 is installed in the monitoring area 104 of the indoor 100, but is installed in a position farthest from the access point 101 in the monitoring area 104 and is connected to the LAN / WAN 106. Has been. Here, the monitoring area 104 is a range for detecting the intruder 103 into the indoor 100, and the radio signal monitoring device 105 includes a radio wave intensity measuring function for measuring the radio wave intensity of the radio signal 102, and the monitoring area 4. A discrimination function for discriminating the presence or absence of an intruder as compared with a radio field strength threshold set in advance as a radio wave strength for discriminating whether or not an intruder is present, and an alarm terminal used by the floor manager via the LAN / WAN 106 107 is provided with reporting means for reporting the presence or absence of abnormality.

  The alarm terminal 107 used by the floor manager is not only a terminal that outputs an alarm lamp, an alarm sound, or an alarm display, but also a server that has a database in which terminal information specific to a terminal carried by a person who allows intrusion is registered. You may make it have the function as.

  The terminal 109 is a terminal carried by the intruder 103 and can communicate with the access point 101. The terminal 109 is, for example, a wireless LAN terminal such as a wireless LAN telephone or an RF tag. The access point 101 that has communicated with the terminal 109 receives the MAC via the LAN / WAN 106 in response to a request for returning the terminal information of the terminal 109 carried by the intruder 103 from the alarm terminal 107 used by the floor manager. It has a function of notifying terminal information unique to the terminal 109 such as an address to the requesting alarm terminal 107.

  The terminal management server 108 includes an entrance management database for managing whether or not a person carrying the terminal 109 is allowed to enter the room. The entrance management database includes, for example, each terminal 109 such as a MAC address. The terminal information unique to each is registered in advance from the alarm terminal 107 used by the floor manager as information for identifying whether or not the person is permitted to enter the room. When the terminal management server 108 receives an inquiry from the alarm terminal 107 used by the floor manager as to whether the terminal information of the terminal 109 carried by the intruder 103 is a terminal of a person permitted to enter the room, The room entry management database is searched, and the alarm terminal 107 is responded as to whether or not the person permitted to enter the room is a terminal carried by the person.

(Description of operation of embodiment)
Next, an example of the operation of the intrusion detection system of FIG. 1 which is an embodiment of the present invention will be described.

  The radio signal monitoring device 105 constantly monitors the radio field intensity of the radio signal 102 transmitted from the access point 101. If there is no movement of a person in the monitoring area 104 as in normal times, the radio wave intensity monitored by the wireless signal monitoring device 105 is not greatly reduced, and an intruder 103 entering the monitoring area 104 is It is determined that there is no problem and “no problem”.

  On the other hand, when the intruder 103 enters the monitoring area 104 of the indoor 100, the radio field intensity monitored by the wireless signal monitoring device 105 is lower than normal due to multipath and fading by the human body of the intruder 103. Therefore, it is determined that “there is a problem (there is an intruder)” assuming that there is an intruder 103 in the monitoring area 104.

  When the intruder 103 in the monitoring area 104 is detected and determined to be “problematic (intruder)”, the wireless signal monitoring device 105 uses the voice / email or the like via the LAN / WAN 106 to detect the floor manager. The alarm terminal 107 is notified that “there is a problem (there is an intruder)”.

  The alarm terminal 107 that has received the “problem (intruder)” notification communicates with the access point 101 via the LAN / WAN 106 and the intruder 103 to the monitoring area 104 carries the terminal 109. Causes the terminal information such as the MAC address unique to the terminal 109 to be returned to the alarm terminal 107 of the floor manager via the LAN / WAN 106.

  The alarm terminal 107 of the floor manager who has received the terminal information of the terminal 109 communicates with the terminal management server 108, and the terminal information of the terminal 109 is registered as a terminal of a person permitted to enter the room in the room management database. Inquire whether or not. When receiving a response indicating that it is registered in the room management database from the terminal management server 108, the alarm terminal 107 indicates that the intruder 103 who has been notified is a person who is permitted to enter the room. Is determined.

  On the other hand, when receiving a response from the terminal management server 108 indicating that it has not been registered in the entry management database, the alarm terminal 107 determines that the intruder 103 who received the notification is an illegal intruder who is not allowed to enter the room. Look at it and determine that there is a problem (there is an intruder).

  As described above, if the floor manager who uses the alarm terminal 107 receives a notification from the wireless signal monitoring device 105 that the intruder 103 has been detected in the monitoring area 104, the intruder 103 is illegal. Information capable of determining whether or not an intruder is received from the terminal management server 108 can be received.

  The operation as described above will be further described with reference to the flowcharts of FIGS. FIG. 2 is a flowchart showing an example of the operation of the intrusion detection system shown in FIG. 1. The wireless signal monitoring apparatus 105 detects an intruder 103 into the monitoring area 104 and informs the floor manager's alarm terminal 107 to that effect. It shows the operation until reporting to. FIG. 3 is a flowchart showing an example of the operation of the intrusion detection system shown in FIG. 1 following the flowchart of FIG. 2, and shows that there is an intruder 103 in the monitoring area 104 from the radio signal monitoring device 105. The alarm terminal 107 that has received the notification shows the operation until it is determined whether or not the intruder 103 who has received the notification is an illegal intruder.

  First, according to the flowchart shown in FIG. 2, an example of the operation until the radio signal monitoring apparatus 105 detects the intruder 103 into the monitoring area 104 and notifies the floor manager's alarm terminal 107 to that effect will be described. .

  First, the radio signal monitoring apparatus 105 determines in advance whether or not the intruder 103 to the monitoring area 104 exists with respect to the radio field intensity when the radio signal 102 from the access point 101 is received. An intensity threshold is set as an intruder determination criterion (step S200). The radio field intensity threshold value can be appropriately adjusted and set according to the radio wave environment of the monitoring area 104 and the detection target. That is, the radio wave intensity threshold value may be set to an average value of actual measurement results in the presence / absence of the intruder 103 in the monitoring area 104, but in order to prevent erroneous detection, the floor manager It is also possible to adjust and set appropriately.

  Thereafter, the radio signal monitoring apparatus 105 measures the radio field intensity of the radio signal 102 from the access point 101 (step S201), and compares the measured radio field intensity with a radio field intensity threshold set in advance as an intruder determination criterion. (Step S202). If the measured radio field intensity is equal to or greater than the radio field intensity threshold (Yes in step S202), it is determined that there is no intruder 103 in the monitoring area 104, and “no problem” is determined (step S203). After returning, the operation of measuring the radio field intensity of the radio signal 102 is repeated.

  On the other hand, when the measured radio field intensity is lower than the radio field intensity threshold (No in step S202), it is assumed that there is an intruder 103 in the monitoring area 104 and “There is a problem (there is an intruder)”. Determination is made (step S204). If it is determined that “there is a problem (there is an intruder)”, the wireless signal monitoring apparatus 105 reports to the alarm terminal 107 used by the floor manager by means of voice, mail, or the like via the LAN / WAN 106 (step S205).

  Thus, the operation until the radio signal monitoring apparatus 105 detects the intruder 103 into the monitoring area 104 and reports the fact to the alarm terminal 107 of the floor manager ends. Next, the alarm terminal 107 that has received a report from the wireless signal monitoring apparatus 105 indicating that there is an intruder 103 in the monitoring area 104 determines whether or not the intruder 103 that received the report is an illegal intruder. An example of the operation until the determination is made will be described according to the flowchart shown in FIG.

  In the flowchart of FIG. 3, the alarm terminal 107 that has received a report from the wireless signal monitoring device 105 indicating that there is an intruder 103 in the monitoring area 104 communicates with the access point 101 via the LAN / WAN 106. When the intruder 103 is carrying the terminal 109, an acquisition request notification requesting that the terminal information specific to the terminal 109 is acquired and returned is transmitted. Receiving the acquisition request notification, the access point 101 transmits a radio signal instructing to return terminal information to the terminal 109 of the intruder 103 (step S301).

  If the intruder 103 does not carry the terminal 109, or carries the terminal 109, if the terminal information is not returned from the terminal 109 even after a predetermined time has elapsed, the terminal information is acquired. The access point 101 returns a response indicating that the request could not be made to the alarm terminal 107 via the LAN / WAN 106.

  On the other hand, when the terminal information is returned from the terminal 109 within a predetermined time, the access point 101 returns the terminal information returned from the terminal 109 to the alarm terminal 107 via the LAN / WAN 106. To do.

  The alarm terminal 107 of the floor manager acquires the terminal information of the terminal 109 when acquiring the response that the terminal information could not be acquired from the access point 101 or the terminal information of the terminal 109 carried by the intruder 103. It is determined whether or not it has been possible (step S302). If the terminal information could not be acquired (No in step S302), the detected intruder 103 is regarded as a trespasser who is not permitted to enter the room, and immediately proceeds to step S305. , “There is a problem (there is an intruder)” and notifies the floor manager (step S305).

  On the other hand, if the terminal information of the terminal 109 can be acquired (Yes in step S302), the alarm terminal 107 notifies the terminal management server 108 that the acquired terminal information indicates that the person permitted to enter the room is Inquiry information for inquiring whether the terminal information of the terminal being carried is registered in the room management database is transmitted. Upon receiving the inquiry information, the terminal management server 108 searches whether or not the acquired terminal information is registered in the entry management database, and returns registration presence / absence information indicating the search result to the inquiring alarm terminal 107. To do.

  The alarm terminal 107 that has received the registration presence / absence information from the terminal management server 108 determines whether or not the intruder 103 is permitted to enter the room based on the registration presence / absence information (step S303). If it is determined that the intruder 103 is allowed to enter the room (Yes in step S303), the floor manager is finally notified that there is no problem (step S304). On the other hand, when it is determined that the intruder 103 is not permitted to enter the room (No in step S303), the intruder 103 is regarded as an illegal intruder and “problem (there is an intruder)”. To the floor manager (step S305).

(Explanation of effect of embodiment)
As described in detail above, in the present embodiment, the following effects can be obtained.

  As a first effect, a radio signal monitoring device 105 that uses a general-purpose wireless LAN access point 101 used for normal data communication and monitors the radio wave intensity of the radio signal 102 from the access point 101 is provided. When the intruder 103 intrudes into the monitoring area 104 just by installing it in the monitoring area 104, if the human body crosses the wireless area of the access point 101, the radio field strength decreases due to multipath and fading. By using this, it is possible to reliably detect whether a human has entered the monitoring area 104.

  As a second effect, a person who is allowed to enter the terminal 109, such as a wireless LAN terminal or an RF tag, is allowed to carry it, and terminal information unique to the terminal 109 is allowed to enter the terminal management server 108. If the intruder 103 in the monitoring area 104 is detected, the intruder 103 may be an authorized intruder or an illegal intrusion. Can be easily identified.

(Other embodiments of the present invention)
In the above-described embodiment, a case where a wireless LAN beacon signal defined by, for example, the IEEE 802.11 standard is used as a wireless signal has been described. A beacon signal is a radio signal that can be used to notify peripheral wireless terminals of information necessary for communication, and can ensure a certain signal level intensity at a constant period, and is wirelessly transmitted by the human body. It has the characteristic that the radio field intensity of the signal decreases. However, any signal other than a beacon signal may be used as long as it is a radio signal that can satisfy the same condition as the beacon signal described above, and may be, for example, a data packet. Further, not only a wireless LAN beacon signal, but also a wireless signal conforming to the WiMAX standard or a wireless signal of a general PHS system for wireless communication, if there is a radio signal having similar characteristics, it is replaced. It is possible.

The configuration of the preferred embodiment of the present invention has been described above. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist of the present invention. For example, the embodiment of the present invention can be expressed as the following configuration in addition to the configurations (1), (8), (11), and (14) in the means for solving the problems. The numbers (2)-(7), (9)-(10), (12)-(13) and (15)-(23) below correspond to the item numbers in the claims.
(2) The wireless signal from the access point measured by the wireless signal monitoring device is a beacon signal compliant with the IEEE 802.11 standard, a wireless signal compliant with the WiMAX standard, or the wireless of the PHS system for wireless communication. The intrusion detection system according to (1), which is one of signals.
(3) The radio field intensity threshold of the radio signal monitoring device can be set to an average value of the actual measurement results based on the actual measurement results in the monitoring area or can be adjusted to an arbitrary value. The intrusion detection system according to (1) or (2).
(4) The wireless signal monitoring device is connected to a network, and when the wireless signal monitoring device detects an intruder that has entered the monitoring area, the administrator uses the fact that the intruder has been detected. The intrusion detection system according to any one of (1) to (3), wherein the alarm terminal is notified via the network.
(5) Upon receiving a notification that an intruder has been detected from the wireless signal monitoring device, the alarm terminal accesses the access point via the network, and an intruder who has entered the monitoring area The intrusion detection system according to (4), wherein terminal information specific to the terminal being carried is acquired.
(6) The intrusion detection system according to (5), wherein the terminal information unique to a terminal carried by an intruder who has entered the monitoring area is a MAC address.
(7) The alarm terminal is specific to a terminal carried by a person who is permitted to enter the monitoring area when the terminal information specific to the terminal carried by the intruder who has entered the monitoring area is acquired from the access point. An intruder who has entered the monitoring area is permitted to enter based on whether or not the acquired terminal information is registered in the database. The intrusion detection system according to (5) or (6), wherein the intrusion detection system determines whether the person is a person or an unauthorized intruder.
(9) The wireless signal from the access point to be measured is either a beacon signal conforming to the IEEE 802.11 standard, a wireless signal conforming to the WiMAX standard, or a wireless signal of a PHS system for wireless communication. The radio signal monitoring apparatus according to (8) above.
(10) The wireless communication according to (8) or (9), wherein when an intruder who has entered the monitoring area is detected, the alarm terminal used by the administrator is notified via the network that the intruder has been detected. Signal monitoring device.
(12) The alarm terminal according to (11), wherein the terminal information unique to a terminal carried by an intruder who has entered the monitoring area is a MAC address.
(13) When terminal information specific to a terminal carried by an intruder who has entered the monitoring area is acquired from the access point, terminal information specific to a terminal carried by a person permitted to enter the monitoring area is previously stored. Based on whether or not the terminal information obtained by accessing the registered database is registered in the database, whether the intruder who has entered the monitoring area is a person permitted to enter, The alarm terminal according to (11) or (12), wherein the alarm terminal determines whether the intruder is not permitted.
(15) A wireless signal from the access point measured by the wireless signal monitoring device is a beacon signal compliant with the IEEE 802.11 standard, a wireless signal compliant with the WiMAX standard, or the wireless of the PHS system for wireless communication. The intruder detection method according to (14), wherein the intruder detection method is any one of signals.
(16) When the wireless signal monitoring device detects an intruder that has entered the monitoring area, the wireless signal monitoring device notifies the alarm terminal used by the administrator that the intruder has been detected. Intruder detection method.
(17) Upon receiving a notification that an intruder has been detected from the wireless signal monitoring device, the alarm terminal accesses the access point and is specific to the terminal carried by the intruder who has entered the monitoring area. The intruder detection method according to (16), wherein the terminal information is acquired.
(18) The intrusion detection method according to (17), wherein the terminal information unique to a terminal carried by an intruder who has entered the monitoring area is a MAC address.
(19) When the alarm terminal acquires terminal information specific to a terminal carried by an intruder who has entered the monitoring area from the access point, the alarm terminal is specific to the terminal carried by a person permitted to enter the monitoring area. An intruder who has entered the monitoring area is permitted to enter based on whether or not the acquired terminal information is registered in the database. The intruder detection method according to (17) or (18), wherein it is determined whether the person is a person or an unauthorized intruder.
(20) An intruder detection program in which at least part of the intruder detection method according to any one of (14) to (16) is implemented as a program executable by a computer.
(21) A program recording medium in which the intruder detection program of (20) is recorded on a computer-readable recording medium.
(22) An intrusion permission determination program in which at least a part of the intruder detection method according to any one of (17) to (19) is implemented as a program executable by a computer.
(23) A program recording medium in which the intrusion permission determination program of (24) is recorded on a computer-readable recording medium.

100 Indoor 101 Access Point 102 Wireless Signal 103 Intruder 104 Monitoring Area 105 Wireless Signal Monitoring Device 106 LAN / WAN
107 Alarm terminal (floor manager)
108 terminal management server 109 terminal

Claims (14)

In an intrusion detection system that detects that an intruder has entered a predetermined monitoring area, a wireless signal monitoring device that measures the radio wave intensity of a wireless signal transmitted by a wireless LAN access point is provided in the monitoring area. The radio wave intensity of the radio signal from the access point, which is arranged at the position farthest from the access point and measured by the radio signal monitoring device, is the radio wave intensity for detecting the presence of a person who has entered the monitoring area When it falls below a predetermined radio field strength threshold, it is determined that an intruder has entered the monitoring area ,
The wireless signal monitoring device is connected to a network, and when the wireless signal monitoring device detects an intruder that has entered the monitoring area, an alarm terminal used by an administrator to detect that the intruder has been detected. Report via the network,
When receiving a notification that an intruder has been detected from the wireless signal monitoring device, the alarm terminal accesses the access point via the network and is a terminal carried by the intruder who has entered the monitoring area. Get unique device information,
Intrusion detection system. The wireless signal from the access point measured by the wireless signal monitoring device is either a beacon signal conforming to the IEEE 802.11 standard, a wireless signal conforming to the WiMAX standard, or a wireless signal of a PHS system for wireless communication. The intrusion detection system according to claim 1, wherein The radio field intensity threshold value of the radio signal monitoring device can be set to an average value of the actual measurement results or adjusted to an arbitrary value based on the actual measurement results in the monitoring area. The intrusion detection system according to claim 1 or 2. The intrusion detection system according to claim 1, wherein the terminal information unique to the terminal carried by the intruder who has entered the monitoring area is a MAC address. When the alarm terminal obtains terminal information specific to a terminal carried by an intruder who has entered the monitoring area from the access point, terminal information specific to a terminal carried by a person permitted to enter the monitoring area An intruder who has entered the monitoring area is a person permitted to enter based on whether or not the acquired terminal information is registered in the database. The intrusion detection system according to claim 1, wherein the intruder detection system determines whether the intruder is unauthorized. In an alarm terminal that issues an alarm to an administrator that an intruder has entered a monitoring area that is predetermined as an area to be monitored, when the notification that an intruder has entered the monitoring area is received, the monitoring area A warning terminal characterized in that a wireless LAN access point that covers a wireless area is accessed via a network and terminal information specific to a terminal carried by an intruder who has entered the monitoring area is acquired. The alarm terminal according to claim 6, wherein the terminal information unique to the terminal carried by the intruder who has entered the monitoring area is a MAC address. When terminal information specific to a terminal carried by an intruder who has entered the monitoring area is acquired from the access point, terminal information specific to a terminal carried by a person permitted to enter the monitoring area is registered in advance. Based on whether or not the acquired terminal information is registered in the database, whether the intruder who has entered the monitoring area is a person who is permitted to enter or is permitted. The alarm terminal according to claim 6, wherein it is determined whether there is no intruder. An intruder detection method for detecting that an intruder has entered a predetermined monitoring area, wherein a wireless signal monitoring device for measuring a radio signal intensity of a wireless signal transmitted by a wireless LAN access point is provided in the monitoring area. The radio wave intensity of the radio signal from the access point measured by the radio signal monitoring device is detected at the position farthest from the access point and detects the presence of a person who has entered the monitoring area. When the radio field intensity falls below a predetermined radio field intensity threshold, it is determined that an intruder has entered the monitoring area,
When the wireless signal monitoring device detects an intruder that has entered the monitoring area, it notifies the alarm terminal used by the administrator that the intruder has been detected,
When receiving a notification that an intruder has been detected from the wireless signal monitoring device, the alarm terminal accesses the access point and obtains terminal-specific terminal information carried by the intruder who has entered the monitoring area. get,
Intruder detection method. The wireless signal from the access point measured by the wireless signal monitoring device is either a beacon signal conforming to the IEEE 802.11 standard, a wireless signal conforming to the WiMAX standard, or a wireless signal of a PHS system for wireless communication. The intruder detection method according to claim 9, wherein: The intrusion detection method according to claim 9 or 10, wherein the terminal information unique to a terminal carried by an intruder who has entered the monitoring area is a MAC address. When the alarm terminal obtains terminal information specific to a terminal carried by an intruder who has entered the monitoring area from the access point, terminal information specific to a terminal carried by a person permitted to enter the monitoring area An intruder who has entered the monitoring area is a person permitted to enter based on whether or not the acquired terminal information is registered in the database. The intruder detection method according to claim 9, wherein the intruder detection method determines whether the intruder is not permitted. An intrusion permission determination program characterized in that at least a part of the intruder detection method according to any one of claims 9 to 12 is implemented as a program executable by a computer. A program recording medium, wherein the intrusion permission determination program according to claim 13 is recorded in a computer-readable recording medium.

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