RU2791598C1 - Method for controlling unauthorized access to object using infrared sensor in energy-efficient wireless networks - Google Patents

Abstract

FIELD: security alarms.

SUBSTANCE: security alarms using centralized alarm systems based on wireless communication systems and infrared radiation to detect intrusion on a protected object. the method for controlling unauthorized access is based on the use of wireless communication systems and motion detection terminal devices based on infrared radiation (IR sensors), which are autonomous in terms of power supply, but are characterized by frequent transmission of signal packets in inhabited premises. Adaptive control of the IR sensor.

EFFECT: reduction of the energy consumption of the end devices of the network while increasing the reliability of unauthorized access control.

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Description

The invention relates to the field of MCP G08B 13/19, G08B 25/10, namely, to the use of methods for detecting infrared radiation in signaling systems in which the location of an intrusion into a protected area is transmitted to a central station using wireless transmission systems.

Known "System for the protection of the perimeter "Radio frontier", described in the patent RU No. 129283, IPC G08B 25/00, publ. 2013 (analogue 1). The system contains a block of detection tools and a block for collecting and displaying information. The block of means of detection contains motion sensors operating on various physical principles, including passive infrared sensors (IR). Communication between all motion sensors and the block for collecting and displaying information is carried out using a 433 MHz radio communication channel. The system provides an extension of the zone of protection and monitoring of objects with which there are no wired communication lines. When an intruder is detected, the sensors generate an alarm notification and transmit it through neighboring sensors, which in this case work as repeaters, to the information collection and display unit. Information processing in the system is carried out with the possibility of using intelligent algorithms to achieve the maximum detection probability and the minimum number of false alarms.

Similar essential features are: sensors operating on different physical principles, a block for collecting and displaying information, communication between all sensors and a block for collecting and displaying information using a radio channel (no wired communication lines).

The disadvantage of the system is the use of narrow-band channels in the range of 433 MHz and the low energy efficiency of the system, which requires the use of an external battery for sensors.

Known "Mobile complex of technical means of protection", described in the patent RU No. 2427039, IPC G08B 13/19, publ. 2011 (analogue 2). The complex contains a control center and a perimeter security system. The perimeter security system consists of N local security posts, each of which contains a passive infrared detection tool, as well as a transmitter and receiver of a two-position radio-beam detection tool, a thermal imager and a sensor for detecting an intruder approaching a local security post (discontinuous detection tool). All means of detection and surveillance incorporate radio transmitters that transmit information to the control point. This complex provides control of the ground and air space of the protected area.

Similar essential features are: a control point, a perimeter security system consisting of local security posts, perimeter detection tools (radio beam, passive infrared, interrupted).

The disadvantages of the system are:

1) lack of two-way radio communication between the control point and the rest of the complex components, which limits the functionality of the complex (the control point provides one-way reception of radio signals and it does not have the ability to configure and control the complex components);

2) the transmission of information in the complex is carried out at the same radio frequency of the radio channel, which complicates the simultaneous reception of trigger signals from detection equipment and video information from surveillance equipment.

3) the operation of the mobile complex involves deployment in the presence of external power for local security posts.

Known "Method for wireless detection of the opening of the object of control", described in the patent RU No. 2697946, IPC G08B 13/19, publ. 08/21/2019 (analogue 3), which consists in the fact that a wireless PIR sensor is installed in the area of the control object, with the help of which, using LPWAN or NB IoT technology, messages are sent to the base station installed in the radio signal propagation area of the wireless PIR sensor . Using the base station, each message is received from the wireless PIR sensor, processed and sent to the network server. With the help of a network server, each message is received from the base station, processed and sent to the user's electronic device. Each message from the wireless PIR sensor contains the identification data of the wireless PIR sensor and a useful signal, and the useful signal contains a operability control signal when the control object is closed or an alarm signal when the control object is opened.

Similar essential features of the method described in the patent and the proposed method are: the use of an energy-efficient LPWAN network of wireless sensors, a base station (central guard post), a user electronic device (mobile security console), as well as the use of sensor readings to analyze signals with subsequent transmission information to the central guard post.

In the method under consideration, the use of LPWAN makes it possible to eliminate the disadvantages of organizing radio communication channels, since end devices (sensors) operating in such networks provide long-term operation from a built-in power source for several years, a large (several kilometers) range, redundant signal reception by several base stations, high protection against deliberate and accidental interference, and rapid deployment of a security perimeter. These advantages are achieved, as the authors of the method rightly point out, in the case of application for remote control and suppression of control and suppression of unauthorized opening, for example, technological doors, manhole covers, etc.

The proposed method does not allow to provide the necessary energy efficiency and autonomy of the operation of wireless sensors in inhabited or residential premises. This is due to the fact that such objects involve the alternation of long periods of operation in unguarded mode and armed mode. At the same time, the owner, leaving the premises, sends a message from the mobile device to the server address about the transfer of the object to the armed mode, and, if desired, to use the premises, a message about disarming. The server notifies the owner about the acceptance of the object for protection or disarming. Alarm messages to the user are generated by the server only in armed mode. In case of disarming, the central console does not generate alarm messages for the user and ignores messages from IR sensors. At the same time, the IR sensor in the event of movement at the facility will cause an alarm to be sent to the central console both in the armed mode and in the case of disarming, which is not an energy efficient solution and leads to a multiple increase in battery power consumption.

This drawback can be eliminated in the proposed method by using the properties of a wireless IR sensor when arming and disarming the alarm.

The schematic diagram of the wireless IR sensor device is shown in Fig. 1. An IR sensor for working in a LPWA network consists of a sensitive element 1, a controller 2, a radio module with an antenna 3. The sensing element 1 is connected to the input of the controller 2 of the device, which in turn is connected to the radio module 3, which provides access to the radio network.

The device proposed in the method works as follows:

The IR sensor after installation on the site and activation in the network can be in two modes - sentinel and neutral. In watchdog mode, controller 2, having detected a signal from sensor 1, generates an alarm signal to be sent via a radio channel, and then switches to neutral mode. In neutral mode, controller 2 analyzes sensor 1 signals but does not send alarms when motion is detected. Only after the configurable time interval _Tap has elapsed, the device automatically switches to guard mode and reports this to the central console/server.

In real existing devices, the time interval T _ap can be set in the range from 1 to 60 minutes. If _Tap is minimal, then in this case, in the disarmed mode, in the presence of movement on the object, the end device (IR sensor) will form about 500 packets per 8-hour interval, and at the maximum _Tap - about 10. This means that the number of packets sent and, as a result, the battery life without replacing the power source, depending on T _ap , changes 50 times. Setting using the settings of a more economical mode with a maximum _Tap time leads to the fact that the object, after it is armed and a signal is issued to arm, will be in unarmed mode for a significant time, and the minimum _Tap will lead to a rapid depletion of the power source. For example, devices (for example, MS0101 from Vega-Absolut) have a guaranteed number of packets sent by the device before replacing the power source - 9000. This means that the device lifetime without battery replacement can vary depending on the settings from 18 to 900 days.

The proposed approach is implemented in the system, the block diagram of which is shown in Fig. 2. A software (application) is installed on the user's mobile device 4, which can not only receive signals from the server 5, but also send a message about the object mode to the server 5 (“disarm”, “arm”). The server 5 receives the message and generates commands for transmission to the address of the IR sensor 6 that specify the duration of the passive mode depending on the mode. Further, the commands are transmitted through the communication means 7 and the base transmitting/receiving stations 8 to the IR sensor 6.

If a signal about arming is received from the user's application, the server 5 generates and transmits a message that sets the minimum value for the T _ap parameter, receives confirmation from the sensor 6 that the command has been executed, generates a message for the user about the execution of the command, and switches to the alarm message notification mode user.

If a signal about disarming is received from the user application, the server 5 generates and transmits a message that sets the maximum value for the T _ap parameter, receives confirmation from the sensor 6 that the command has been executed, generates a message for the user about the execution of the command, switches to the mode of ignoring notification messages about the arrival alarm messages from the IR sensor 6.

Claims (1)

A method for controlling unauthorized access to an object using infrared sensors in energy-efficient wireless networks, which consists in the fact that wireless IR sensors are installed in the object location area, which allow transmitting messages using energy-efficient wireless networks (LPWAN) technologies to base stations in the IR sensor radio signal propagation zone , receive and process each message according to LPWAN protocols and standards, send to the network server, process the message with the help of the network server and send it to the user's electronic device, while the message sent to the user contains information identifying the location of the sensor, sensor health signal or alarm upon detecting access to an object, characterized in that when the object is armed, the server sends a service message to the sensors, which sets the minimum time to switch to the armed mode, and when disarming and from the armed mode, the server sends a service message to the address of the sensor or a group of sensors, which sets the maximum time for switching to the armed mode.

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