JP4528946B2 - Indoor intrusion detection system and indoor intrusion detection information transmission system - Google Patents

Description

The present invention uses a radio wave transmitted by a system serving with a constant transmission power, such as a broadcast wave, and does not require a transmitter, and uses a reception level variation due to multipath in an indoor space. Relates to an indoor intrusion detection system and an indoor intrusion detection information transmission system. Furthermore, in the present invention, when an intrusion is detected, intrusion detection information is transmitted from a mobile terminal to a plurality of pre-registered transmission destinations simultaneously using wireless with higher security than wired communication, and intrusion detection is quickly notified. It relates to an intrusion detection information transmission system.

Currently, there is an increasing demand for a safe and secure life and society. In particular, there is a growing awareness of crime prevention against unauthorized entry into single-family homes and apartment buildings such as apartments and apartments, and there is an increasing demand for unauthorized entry security systems.

An important point in an unauthorized intrusion prevention system is that it is difficult for an unauthorized intruder to know that an unauthorized intrusion prevention system is installed. Accordingly, many intrusion detection and security systems using radio waves that cannot be seen with the eyes have been proposed.

In conventional security systems using radio waves, for example, as disclosed in Patent Document 1 to Patent Document 3, there are basically a transmitter and a receiver, and radio waves output from the transmitter are transmitted to the receiver side. In most cases, unauthorized intruders are detected from fluctuations in the reception level of radio waves that occur when an unauthorized intruder crosses the radio wave path, or reflected waves that rebound from the radio waves transmitted to the unauthorized intruder. .
Japanese Patent Laid-Open No. 7-141577 JP 2002-228744 A JP-A-5-233971

Therefore, in conventional crime prevention systems using radio waves, a transmitter which is a function for transmitting radio waves is indispensable, and there are problems such as hardware complexity and an increase in system cost.

Also, in radio wave security systems with transmitters, the radio waves to be transmitted are determined, and if information on the frequencies used is leaked, its presence can be easily grasped with a simple receiver, etc., which is covered by the security system. There may be a problem that an unexplained area is known.

  Furthermore, in a radio wave intrusion detection system that requires a transmitter, it is basically limited to a limited area on the radio wave path between the transmitter and the receiver, depending on the positional relationship between the radio wave transmitter and the receiver. However, there was a problem that it was difficult to detect the intrusion.

For example, in the conventional security system disclosed in Patent Document 4, when an intrusion is detected, a method of transmitting the information only to the security system installer is proposed.
Japanese Patent Laid-Open No. 2003-115085

However, if intrusion detection information is notified only to the security system installer, even if the information is true and urgent, it is often too late to report to the security company or police at that time. There was a problem.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a new indoor intrusion detection system that is simple and has high cost performance while utilizing a property of invisible radio waves and does not require a transmitter.

  It is another object of the present invention to provide a new intrusion detection system having a feature that makes it difficult to check whether a security system is installed by using radio waves not limited to a specific frequency.

  It is another object of the present invention to provide a new intrusion detection system that can efficiently monitor an intruder not only in a specific area but also in an entire indoor space.

In addition, even if the security system installer is out, and it is difficult for the person to respond promptly even if intrusion detection information is received, warning and intimidation to the intruder can be realized instead of the person. The purpose is to provide a possible intrusion detection system.

In order to solve the foregoing problems and objectives, ya the intrusion detection system of the present invention, a monopole antenna or a dipole antenna and a receiving unit using a level variation detection unit for always detecting the variation in the receiving level of the radio wave received And an unauthorized intrusion identifying unit that detects unauthorized intrusion indoors depending on the magnitude of the fluctuation of the reception level, radio waves transmitted from a transmitting station that has entered the indoor space from the window or ceiling from the outside, By creating a multipath environment in which various radio wave paths are formed by reflecting on metal objects such as pipes and fixtures in indoor environments, the intruder blocks the radio wave path, or the intruder opens a door or window. A change in the indoor multipath environment occurs due to a change in the radio wave path, the change appears in the fluctuation of the reception level, and the radio wave transmitted from the transmitting station Wherein the receive level variation exceeding a certain level fluctuation width is detected as unauthorized intrusion, if any.
Also, fluctuations in the reception level of radio waves transmitted by a certain wireless system that provides services at a constant transmission power, such as radio broadcasts, FM broadcasts, TV broadcasts, and mobile phone systems, can be detected in indoor multipath spaces And a second function for detecting intruders indoors based on the magnitude of fluctuations in the reception level.

Further, in the indoor intrusion detection system of the present invention, a simple antenna such as a monopole antenna or a dipole antenna is used as a receiving antenna, so that a multi-object formed by metal objects such as pipes and fixtures in an indoor environment. It is characterized by actively using a path environment and receiving a plurality of radio waves with different directions of arrival.

Furthermore, in the indoor intrusion detection system of the present invention , if the indoor is an unattended environment, the multipath environment does not change, and the reception antenna of the indoor intrusion detection system receives a certain level of radio waves. However, if someone is entering indoors reaches the door open, and or windows divided by indoor multipath environment changes, using the principle of variation of the received level occurs, the entire indoor space In addition, unauthorized intrusion is detected by reception level fluctuation due to multipath environment change.

Further, in the indoor intrusion detection information transmission system of the present invention , a receiving unit using a monopole antenna or a dipole antenna, a level fluctuation detecting unit that constantly monitors fluctuations in the reception level of received radio waves, and fluctuations in the reception level A transmitting station that includes an unauthorized intrusion identifying unit that detects unauthorized intrusion indoors by size and a mobile terminal for transmitting the detected unauthorized intrusion information, and that has entered the indoor space from a window or ceiling from the outside The radio waves transmitted from the indoor environment are reflected on metal objects such as pipes and fixtures in the indoor environment to form a multipath environment in which various radio wave paths are formed. When the radio wave path is changed by opening a door or window, the indoor multipath environment changes, and the change appears in the reception level fluctuation. If a radio wave transmitted from a transmitting station has a reception level fluctuation exceeding a certain level fluctuation range, it is detected as an unauthorized intrusion, and an unauthorized intrusion is detected when the reception level fluctuation exceeds a set appropriate threshold. It is characterized in that it is identified that it has been detected, and a switch for generating a warning alarm by the sound or light of the transmitting mobile terminal is turned on.
Furthermore, in the indoor intrusion detection information transmission system according to the present invention, the unauthorized intrusion identifying unit identifies that an unauthorized intrusion has been detected when the reception level fluctuation exceeds a set appropriate threshold, and It has a function of transmitting intruder detection information to a registration destination.
Furthermore, a first function for constantly monitoring the reception level fluctuation of the existing broadcast radio wave at a certain position in the indoor multipath space, and a second function for detecting an intruder in the room based on the magnitude of the fluctuation of the reception level. Intrusion detection system that can provide a warning and intimidation to the intruder instead of the person, with a function and a third function that generates a warning alarm by sound or light when an intruder is detected It is characterized by providing. Furthermore, the indoor intrusion detection information transmission system according to the present invention has a fourth function of transmitting intruder detection information from the calling mobile terminal to the registration destination when an intruder is detected. It is characterized by having multiple settings such as neighborhood residents and room managers.

The indoor intrusion detection system according to the present invention eliminates the need for a transmitter, so that a device can be configured with only a receiver, a hardware configuration is simple, and a high cost performance indoor intrusion detection system can be realized.

  In addition, because it uses radio waves that are currently being serviced, it is not necessary to use radio waves for transmission specific to intrusion detection systems, making it extremely difficult for an intruder to determine whether an intrusion detection system is installed. It becomes.

Further , in the indoor intrusion detection system according to the present invention, the hardware configuration can be simplified by using a simple antenna as a receiving antenna, and radio waves of various directions of arrival generated in an indoor multipath environment can be realized. Easier to receive.

Furthermore , in the indoor intrusion detection system according to the present invention, when someone intrudes indoors, the indoor multipath environment changes in principle, and reception level fluctuations always occur. By constantly monitoring fluctuations, it is possible to monitor unauthorized intrusion over the entire indoor space. For this reason, it is possible to realize intrusion detection with a wide monitoring range and high accuracy.

In addition , the indoor intrusion detection information transmission system according to the present invention has a function of transmitting intrusion detection information all at once when an indoor intrusion is detected, even if the intrusion detection system installer goes out, By transmitting intrusion detection information to residents or living room managers, it can be expected to promptly respond to warnings and threats to intruders.

  The best mode for carrying out the present invention will be described below with reference to the drawings. In the indoor intrusion detection system and the indoor intrusion detection information transmission system according to the present invention, any radio wave of a wireless system that transmits a certain amount of power can be used as a transmission source. Will be described as an example.

  Hereinafter, an embodiment of a radio wave type indoor intrusion detection system and an indoor intrusion detection information transmission system using an indoor radio multipath environment without requiring a transmitter, which is a feature of the present invention, will be described with reference to the drawings.

  FIG. 1 shows a situation where a TV broadcast radio wave enters an indoor space from a window, a ceiling, or the like, and the radio wave is reflected on a floor or a door and the indoor environment is a multipath environment. In FIG. 1, 1 is a TV broadcast transmitting station, and the radio waves transmitted from this transmitting station are basically independent of the outdoor environment, and are shown in FIG. Enter the indoor space as expected. When a metal object is present on the floor 5, door 6 or ceiling 4, etc., the radio waves that enter the room are reflected by the metal object, and various radio paths are formed as shown in 7A to 7C. An environment is created. Reference numeral 8 denotes a radio wave receiver which is a part of the intrusion detection system according to the present invention. The radio wave receiver 8 uses a monopole antenna in this embodiment and is installed at an appropriate position. In this indoor multipath environment, radio waves that enter from the outdoors are reflected by various metal objects, so that the phases of a plurality of radio waves received by the antenna in the radio wave receiver 8 are the same or opposite. In principle, the reception level may be stronger or weaker. In other words, in an indoor space, when an intruder cuts off a radio path that creates a multipath environment, or when a multipath environment change occurs such as when the intruder opens a door or window, the radio path changes. The change appears remarkably in the reception level fluctuation. Also, by using a monopole antenna, not only simplification of the antenna can be achieved, but it is also possible to efficiently receive multiple radio waves with different directions of arrival that occur in a multipath environment. And it becomes possible to detect with high precision.

  Hereinafter, the principle of intrusion detection according to the present invention will be described with reference to FIGS.

  FIG. 2 shows basic characteristics of radio wave reception level fluctuations when the indoor space is unattended. When the indoor space is unattended, if the receiver 8 is fixed at an appropriate location, the indoor multipath environment does not change. Therefore, the reception level is stable and fluctuates as indicated by 9 in the graph on the right in FIG. Almost never occurred. At this time, even if there is a moving object such as a person or a car outside the room as indicated by 10 in FIG. 2 (the door 6 is not opened at this time), the influence on the radio wave propagation in the indoor space is almost zero. It turned out not to exist. For this reason, the indoor multipath environment does not change, and the reception level continues to maintain a stable state (state 9 in FIG. 2).

  FIG. 3 is a graph showing a state when ten intruders shown in the figure open the door 6 and a change in reception level of radio waves at that time. In the unmanned state, as shown in FIG. 1 and FIG. 2, the radio wave reflected on the door is also a part of the multipath radio wave received by the antenna, but at the moment the intruder 10 opens the door, 6 is lost, and the radio wave 11 is no longer received by the antenna, so that the phase relationship of the plurality of radio waves received so far collapses and the reception level decreases or increases. As indicated by 12 in the graph, the reception level fluctuates.

  FIG. 4 is a graph showing a state when ten intruders enter the room from the unmanned indoor space and move from the right (13 in the figure) to the left (14 in the figure) and the reception level fluctuation at that time. . Although the reception level is stable in the unmanned state (the state of FIG. 2 described above), when the intruder 10 enters the room and moves from right to left, it is indicated by 13 or 14 in FIG. In this way, the multipath environment is changed by blocking or reflecting the radio waves generating the indoor multipath environment. For this reason, the phase relationship of the plurality of radio waves received so far is broken, the reception level is lowered or increased, and the reception level fluctuates as indicated by 15 in the lower graph in FIG.

  As shown in FIGS. 3 and 4, in the intrusion detection system of the present invention, when an intruder enters an indoor space where a radio multipath environment is generated, it is possible to detect the intrusion due to a change in reception level. Become. In addition, the reception level is almost constant in an unattended state, and there is almost no fluctuation range of the reception level, but the reception level greatly fluctuates when an intruder enters or moves indoors. By monitoring the level fluctuation range, unauthorized intrusion can be detected with high accuracy.

  Furthermore, in the indoor intrusion detection information transmission system according to the improvement of the present invention, intrusion detection is performed using a mobile terminal in order to realize notification of intrusion detection through a highly secure wireless connection when an intrusion is detected. It has a function to send information.

  FIG. 5 shows a basic configuration of an embodiment of the indoor intrusion detection system according to the present invention. In the present embodiment, 16 receiving antennas and 17 receiving units for receiving radio waves such as broadcast waves, 18 reception level variation detecting units (detecting units) for monitoring the reception level variation, and a large variation in the reception level. Accordingly, it is composed of 19 unauthorized intrusion detection units that detect unauthorized intrusion and 20 outgoing mobile terminals that transmit detected unauthorized intrusion information.

  The 19 unauthorized intrusion identifying unit sets an appropriate threshold, identifies that an unauthorized intrusion has been detected when the reception level fluctuation exceeds the threshold, and registers the intrusion detection information in the 20 outgoing mobile terminals. Command to notify.

FIG. 6 is a conceptual diagram of a transmission system showing a state in which a plurality of registration destinations (A to D) are notified all at once from the transmission portable terminal 20. As shown in the table 21 in FIG. 6, the outgoing mobile terminal 20 can set a plurality of registration destinations in advance. Through the network 22 such as a mobile phone network or the Internet, the intrusion detection system installer A himself can Of course, it has a function of transmitting intrusion detection information to neighboring residents and living room managers (B to D in the figure). This makes it possible for a person other than the installer himself to respond quickly to threats and warnings to intruders.

  Furthermore, the above-mentioned mobile terminal 20 for sending has a function to switch on a warning (alarm) device that warns and threatens an intruder with sound and light, so that not only the intrusion detection information is transmitted but also sound and light. It can be used to warn and intimidate intruders.

The results of actually measuring fluctuations in the reception level of TV broadcast (Ch.38) radio waves using a monopole antenna are shown below.

FIG. 7 is a plan view showing the measurement environment, and the measurement location is a laboratory on the 8th floor of Hiroshima City University Information Science Building. In FIG. 7, the left side is a reduced plan view of a part of the building where the laboratory exists, and the right side is a plan view of the measured laboratory. The TV broadcasting station is located about 1.8 km away in the south direction. The structure of the laboratory room has a window 23 of about 2 m on the south side, and a metal locker 24 and a bookshelf 25 on both sides of the room. The north side of the room faces the hallway, and a door 26 is attached. In the center of the room is a desk 27 with a height of about 1.2m. In this measurement, 28 reception antennas were placed at the corners of the desk, and radio wave reception level fluctuations were continuously recorded from when the room was left unattended until a person entered the room through the door 26 and moved away from the room.

In this measurement, reception is performed by setting the audio carrier frequency (625.75 MHz) at which the reception level can be measured most stably among TV broadcast signals composed of a video carrier, a color subcarrier, and an audio carrier. Level was measured.

FIG. 8 shows the characteristics of reception level fluctuation obtained in this measurement. From the start of measurement to 110 seconds, the room is in an unattended state. In this case, the reception level shows almost the same value as indicated by 29 in FIG. At this time, there were people walking in the hallway, but it was found that the effect on indoor reception level fluctuation can be ignored. 110 seconds later, a person opened the door 26 and entered. In this case, as indicated by 30 in FIG. 8, it was confirmed that the reception level fluctuated greatly, and obviously a fluctuation different from the unattended state occurred. After the intrusion, the reception level fluctuation range was about 9 dB. In the unmanned state, the fluctuation range of the reception level is 1 dB or less. In this case, for example, if the reception level fluctuation width exceeds the threshold value 3 dB, the reception level fluctuation is monitored by setting to identify that an intrusion has been detected. It was found that intrusion can be detected with high accuracy.

  In the above-described embodiment, TV broadcast waves are used. However, if the wireless system provides services with a constant transmission power, intrusion detection can be realized with high accuracy using the principle of the present invention described above in other wireless systems. Of course, intrusion detection systems using such wireless systems are also within the scope of this patent.

It is the figure which showed a mode that the broadcast electromagnetic wave arrives at a receiving antenna via the path | route of several electromagnetic waves in an indoor multipath environment. It is the figure which showed that a reception level hardly fluctuates, when indoor is an unattended state. It is the figure which showed that an indoor multipath environment changes and a receiving level changes by opening a door. It is the figure which showed that an indoor multipath environment changes and a reception level changes when an intruder moves indoors. 1 is a basic configuration diagram of an embodiment of an indoor intrusion detection system according to the present invention. It is a conceptual diagram of one Example of the indoor intrusion detection information transmission system of this invention. It is the figure which showed the measurement environment when measuring a broadcast wave in order to prove the effect of this invention. It is the figure which showed the reception level fluctuation | variation of the electromagnetic wave when the broadcast wave was measured in order to prove the effect of this invention.

Explanation of symbols

2 Radio wave 6 Door 7A-7C Multipath 8 Radio wave receiver 10 Intruder 12 Reception level fluctuation 15 Reception level fluctuation 16 Reception antenna 17 Reception part 18 Level fluctuation detection part 19 Unauthorized intrusion identification part 20 Mobile terminal for transmission

Claims (3)

A receiver using a monopole antenna or a dipole antenna;
A level fluctuation detection unit that constantly detects fluctuations in the reception level of received radio waves,
Comprising the intrusion identification unit that detects intrusion to indoor me by the magnitude of the fluctuation of the received level,
Radio waves transmitted from a transmitter station that enters the indoor space from the window or ceiling from the outside are reflected by metal objects such as piping and fixtures in the indoor environment, creating a multipath environment in which various radio wave paths are formed. ,
When the intruder blocks the radio wave path, or when the intruder opens a door or window, the radio path changes, causing a change in the indoor multipath environment, and the change appears in the fluctuation of the reception level. ,
An indoor intrusion detection system that detects an unauthorized intrusion when a radio wave transmitted from the transmitting station has a reception level fluctuation exceeding a certain level fluctuation range . A receiver using a monopole antenna or a dipole antenna;
The variation in the receiving level of the received radio wave and the level variation detection unit for always-on monitoring,
And intrusion identification unit that detects intrusion to indoor me by the magnitude of the fluctuation of the received level,
A mobile terminal for transmission that transmits the detected unauthorized intrusion information,
Radio waves transmitted from a transmitter station that enters the indoor space from the window or ceiling from the outside are reflected by metal objects such as piping and fixtures in the indoor environment, creating a multipath environment in which various radio wave paths are formed. ,
When the intruder blocks the radio wave path, or when the intruder opens a door or window, the radio path changes, causing a change in the indoor multipath environment, and the change appears in the fluctuation of the reception level. ,
If the radio wave transmitted from the transmitting station has a reception level fluctuation that exceeds a certain level fluctuation range, it is detected as an unauthorized intrusion,
Identify that it has detected the intrusion when the receive level variation exceeds a suitable threshold value set, indoor intrusion detection, characterized in that switching on of generating a warning alarm by sound or light of the call origination mobile terminal Information dispatch system. The intrusion identification unit identifies that detects intrusion when the receive level variation exceeds a suitable threshold value set, capability machine that sends intruder detection information to the registration destination from the originating portable terminal The indoor intrusion detection information transmission system according to claim 2, wherein: