JP2005209063A - Wireless security device, wireless security system, and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio crime prevention device capable of reporting that there is a danger of intrusion in advance when radio interference is detected in a frequency band to be used for communication between the radio crime prevention device and a sensor terminal. <P>SOLUTION: The invention comprises a receiving means 11 for receiving an intrusion detection signal to output a reception telegram and a carrier detection signal; a control means 12 for interpreting contents of the reception telegram to output a control signal; a radio interference detection means 13 for detecting the radio interference to output the detection result; and a reporting means 14 for reporting according to the control signal and the detection result. The radio interference detection means 13 detects presence of the radio interference when the carrier detection signal has been outputted for a predetermined period of time or over. Thus, when the radio interference is present and radio communication with the sensor terminal cannot be made, the radio crime prevention device 10 is can report in advance the possible danger of intrusion. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wireless security device, a wireless security system, and a program for detecting and informing an intruder into a house or the like.

2. Description of the Related Art Conventionally, several wireless crime prevention devices have been devised that communicate wirelessly with a sensor terminal installed in a house, etc., detect an intruder, and notify (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 7-16288

  However, these wireless crime prevention devices cannot communicate if there are disturbing radio waves in the radio frequency band used for communication with the sensor terminal. In addition, the frequency band used by these wireless security devices for communication with the sensor terminal is often known, such as the 400 MHz band and the 2.4 GHz band. Therefore, if a malicious intruder intentionally generates a jamming radio wave in the radio frequency band that the wireless security device uses for communication with the sensor terminal, the intruder cannot be notified. there were.

  The present invention solves the above-described conventional problems, and can detect in advance that there is a risk of intrusion when a jamming radio wave is detected in a frequency band used for communication between a wireless security device and a sensor terminal. An object is to provide a wireless security device.

  In order to solve the above-described conventional problems, the wireless security device of the present invention includes interference radio wave detection means for detecting the presence of interference radio waves.

  As a result, it is possible to provide a wireless security device capable of informing in advance that there is a risk of intrusion when there is an interfering radio wave and wireless communication with the sensor terminal is not possible.

  The wireless security device, the wireless security system, and the program according to the present invention can notify in advance that there is a risk of intrusion when there is a jamming radio wave and wireless communication with the sensor terminal is not possible.

  The first invention receives an intrusion detection signal wirelessly transmitted by a sensor terminal that detects an intruder, receives a reception message and a carrier detection signal, reads the contents of the reception message output by the reception unit, Control means for outputting a control signal, jamming radio wave detection means for detecting jamming radio waves and outputting detection results, control means for outputting control results, and reporting means for reporting according to the control signals output by the control means and the detection results output by the jamming radio wave detection means. The jamming radio wave detection means is configured to detect the presence of the jamming radio wave when a carrier detection signal is output from the receiving means for a predetermined time or longer, so that the radio wave communication with the sensor terminal is possible. If this is not possible, it is possible to provide a wireless security device that can notify in advance that there is a risk of intrusion.

  According to a second aspect of the invention, in particular, in the first aspect of the invention, the interference detection unit outputs a carrier detection signal from the reception unit for a predetermined time and the reception message output by the reception unit is a specified reception message. If it is not, it is possible to accurately detect the presence of jamming radio waves, and if there is jamming radio waves and wireless communication with the sensor terminal is not possible, there is a risk of intrusion. It is possible to provide a wireless crime prevention device that can be notified in advance.

  A third invention is a system comprising a sensor terminal that wirelessly transmits an intrusion detection signal when an intruder is detected, and a wireless security device that receives and notifies an intrusion detection signal transmitted by the sensor terminal. Receives the intrusion detection signal, outputs the received telegram and carrier detection signal, reads the content of the received telegram output from the receiver, and outputs the control signal, and detects and detects jamming radio waves An interference radio wave detection means for outputting a result; a control signal output by the control means; and a notification means for informing according to a detection result output by the interference radio wave detection means; the interference radio wave detection means is a carrier detection signal from the reception means. Is configured to detect the presence of jamming radio waves when they are output for a predetermined time or longer. It becomes possible to provide a wireless security system that can be pre-notifying at risk for.

  According to a fourth aspect of the present invention, in particular, in the third aspect of the invention, the interference detection unit outputs the carrier detection signal from the reception unit for a predetermined time and the reception message output by the reception unit is a specified reception message. The presence of jamming signals can be detected accurately when there is no jamming signal, and if there is jamming radio waves and wireless communication with the sensor terminal is not possible, there is a risk of intrusion in advance. It is possible to provide a wireless crime prevention system capable of providing notification.

  According to a fifth aspect of the present invention, there is provided a program for causing a computer to realize at least a part of the wireless crime prevention device and the wireless crime prevention system according to any one of the first to fourth aspects. It is possible to easily realize part or all of the wireless security device and the wireless security system by cooperating hardware resources such as servers. Also, the program can be distributed and installed easily by storing the program in a storage medium or distributing the program using a communication line.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a block diagram of a wireless security device according to Embodiment 1 of the present invention.

  First, the operation when an intruder is detected will be described using this block diagram.

  In FIG. 1, 10 is a wireless security device. Reference numeral 50 denotes a sensor terminal, which is installed at an entrance door or window to detect an intruder or is connected to a sensor 51 such as an open / close sensor or a human sensor for detecting infrared rays emitted by a human body. Intrusion detection signal 50A is transmitted wirelessly. In the wireless security device 10, reference numeral 11 denotes a receiving means for receiving the intrusion detection signal 50A. The receiving means 11 receives the intrusion detection signal 50A and outputs a received telegram 11A. Further, the receiving means 11 outputs a carrier detection signal 11B when detecting a radio wave within a receivable frequency band. Reference numeral 12 denotes control means that reads the contents of the received telegram 11A and outputs a control signal 12A. 14 is a notification means that notifies that an intruder has been detected in accordance with the control signal 12A. Although not shown, the notification means 14 performs a notification operation such as a warning sound, a screen display, or a notification to the outside using a communication line.

  Next, the operation in the case where there are jamming radio waves will be described.

  In FIG. 1, reference numeral 90 denotes an interference radio wave generation source that generates an interference radio wave 90A. Since radio waves are a common resource for humankind, they are usually used according to laws such as the Radio Law, but malicious intruders generate illegal jamming radio waves. In an environment where the jamming radio wave 90A exists, the intrusion detection signal 50A cannot be correctly received by the wireless crime prevention device 10, and therefore an intruder cannot be notified.

  In the wireless security device 10, reference numeral 13 denotes interference radio wave detection means. The jamming radio wave detection means 13 receives the carrier detection signal 11B output from the reception means 11. When receiving means 11 detects a radio wave in a receivable frequency band, it outputs carrier detection signal 11B regardless of intrusion detection signal 50A and jamming radio wave 90A. Since the sensor terminal 50 transmits the intrusion detection signal 50A only when an intruder is detected, the carrier detection signal is not output in a situation where there is no intruder. Further, since the time length (T0) of the intruder detection signal can be defined in advance, the jamming radio wave detection means 13 determines that the jamming radio wave 90A exists when the carrier detection signal is input beyond T0, and the notification means. 14 outputs the detection result 13A.

  The notification means 14 performs a notification operation such as notification of the presence of the jamming radio wave 90A, an alarm sound, a screen display, or notification to the outside using a communication line.

  Next, the operation flow of the jamming wave detecting means 13 will be described.

  FIG. 2 shows an operation flow of the jamming wave detecting means in the first embodiment of the present invention.

  When the jamming wave detection means 13 detects the carrier detection signal (step 101), the duration (t1) of the carrier detection signal is counted (step 102). Next, the duration (t1) of the carrier detection signal is compared with a preset threshold time (T1) (step 103). The threshold time (T1) is set based on the time length (T0) of the intruder detection signal. Then, when the duration (t1) of the carrier detection signal exceeds the threshold time (T1), it is determined that there is an interfering radio wave (step 104).

(Embodiment 2)
FIG. 3 is a block diagram of the wireless security device according to Embodiment 2 of the present invention.

  A description overlapping with that of the first embodiment will be omitted.

  In FIG. 3, reference numeral 23 denotes jamming wave detecting means. The jamming wave detection means 23 receives the received telegram 21A and the carrier detection signal 21B output from the reception means 21. The jamming radio wave detecting means 23 has a function of reading the received telegram 21A, and detects the presence of the jamming radio wave from the presence / absence of the carrier detection signal 21B and the interpretation result of the received telegram. When the jamming radio wave detection unit 23 determines that the jamming radio wave exists, the jamming radio wave detection unit 23 outputs a detection result 23A to the notification unit 24.

  The notification unit 24 performs a notification operation such as notification of the presence of jamming radio waves, an alarm sound, a screen display, or notification to the outside using a communication line.

  Next, the operation flow of the jamming wave detection means 23 will be described.

  FIG. 4 shows an operation flow of the jamming wave detecting means in the second embodiment of the present invention.

  When the jamming wave detecting means 23 detects the carrier detection signal (step 201), the duration (t2) of the carrier detection signal is counted (step 202). Next, it is compared whether the received message is a specified message (step 203). If the received message is a specified message, the detection operation is terminated. If it is not a prescribed received message, or if no received message is input, the duration (t2) of the carrier detection signal is compared with a preset threshold time (T2) (step 203). The threshold time (T2) is set based on the time length (T0) of the intruder detection signal. Then, when the duration (t2) of the carrier detection signal exceeds the threshold time (T2), it is determined that there is an interfering radio wave (step 205). The received message is determined as a specified message by comparing the message format, data used in the message, and the like with preset contents. Therefore, when the message format does not match or when unknown data is used, it is determined as a jamming wave.

  In Embodiment 2, since the carrier detection signal based on the jamming radio wave and the carrier detection signal based on the intruder detection signal are distinguished and determined, the jamming radio wave can be detected more accurately.

  Note that the means described in this embodiment causes hardware resources such as a CPU (or microcomputer), a RAM, a ROM, a storage / recording device, an electrical / information device including an I / O, a computer, a server, and the like to cooperate. You may implement with the form of a program. In the form of a program, new functions can be easily distributed / updated and installed by recording them on a recording medium such as magnetic media or optical media or distributing them via a communication line such as the Internet.

  As described above, the wireless crime prevention device and the wireless crime prevention system according to the present invention invalidate the crime prevention function using jamming radio waves, and notify in advance of the presence of an intruder who intends to illegally enter a house or the like. It can be applied to crime prevention devices for home use or business use.

Block diagram of a wireless crime prevention device in Embodiment 1 of the present invention Operation flow diagram of interference radio wave detecting means in Embodiment 1 of the present invention Block diagram of the wireless security device in the second embodiment of the present invention Operation flow diagram of interference radio wave detection means in Embodiment 2 of the present invention

Explanation of symbols

10, 20 Wireless crime prevention device 11, 21 Receiving means 12, 22 Control means 13, 23 Interference radio wave detection means 14, 24 Notification means 50 Sensor terminal 51 Sensors 90

Claims (5)

Receives an intrusion detection signal transmitted wirelessly from a sensor terminal that detects an intruder, receives a reception message and a carrier detection signal, reads the content of the reception message output by the reception unit, and outputs a control signal Control means for detecting the jamming radio wave and outputting a detection result, a control signal output by the control means, and a notifying means for reporting according to the detection result output by the jamming radio wave detection means. The jamming radio wave detection means detects a presence of jamming radio waves when a carrier detection signal is output from the receiving means for a predetermined time or more. The interference detection means detects the presence of an interference radio wave when a carrier detection signal is output from the reception means for a predetermined time or more and a reception message output by the reception means is not a prescribed reception message. The wireless crime prevention device according to 1. A system composed of a sensor terminal that wirelessly transmits an intrusion detection signal when an intruder is detected, and a wireless security device that receives and notifies the intrusion detection signal transmitted by the sensor terminal, wherein the wireless security device is an intrusion detection signal. Receiving means for receiving the received telegram and the carrier detection signal, reading the content of the received telegram output by the receiving means, outputting the control signal, detecting the jamming radio wave and outputting the detection result An interference radio wave detection unit, a control signal output from the control unit, and a notification unit that performs notification according to a detection result output from the interference radio wave detection unit, wherein the interference radio wave detection unit receives a carrier detection signal from the reception unit in advance. A wireless crime prevention system that detects the presence of jamming waves when it is output for longer than a specified time. The interference detection means detects the presence of an interference radio wave when a carrier detection signal is output from the reception means for a predetermined time or more and a reception message output by the reception means is not a prescribed reception message. The wireless crime prevention system according to 3. The program for making a computer implement | achieve at least one part of the function of any one of Claims 1-4.

Images