FR3073070A1 - DETECTION AND ALERT DEVICE FOR ALARM SYSTEM AND ALARM SYSTEM COMPRISING SAME - Google Patents

Abstract

The invention relates to an alarm system detection and warning device (10) comprising: - at least one intrusion detection device (1), - a radio interference detection detection component (2, 42). the ISM and GSM bands, processing means, calculation means and storage means (3), configured to perform a signal processing provided by the intrusion detection detector and the first radio module in order to detect an intrusion and / or radio interference, - a radio module (4, 6) comprising a transmitting radio component (41, 61) ISM and LPWAN and configured to transmit an alert signal either to a local ISM band alarm center on radio-interference-free intrusion detection, either to a LPWAN network in one-way mode in the event of radio interference detection with or without intrusion detection and a receiving radio component (42, 62) ISM; power supply means.

Description

The present invention relates to alarm systems protecting premises and provides a detection and alert device intended to reinforce security.

Technological background

A large part of the effectiveness of an alarm system lies in its ability to quickly flee an intruder who has broken into premises such as offices, industrial or commercial premises or even secure habitats so as not to leave him time to commit theft or damage.

For reasons of cost and ease of installation, alarm systems are more and more systems where the various sensors and the alarm center which manages them and which is in charge of transmitting alarms to a center remote surveillance devices communicate by radio, which introduces a major security flaw.

Indeed, there are radio jammers capable of rendering this type of alarm system inoperative by not only cutting off communications between the sensors and the alarm system's alarm center on the frequency bands dedicated to industrial, scientific and medical, ISM bands, which are dedicated to short-range transmissions for industrial, scientific, medical, domestic or similar applications as defined for example in Europe in table 1 of ΙΈΝ 55011 but also by cutting the GSM link to the center of remote monitoring by saturating the GSM receiver of the alarm center.

The current deterrent systems such as siren, device for broadcasting voice messages, smoke generator or others being linked and activated by the alarm center which communicate with the latter by radio also become inoperative, the radio jamming causing in the best case, a message on the console of the remote monitor indicating a loss of connection with the alarm center but often after several hours and without any other indication of the origin of the problem.

Brief description of the invention

In view of this situation, the present invention aims to propose a device adapted in the first place to maintain communication with a remote monitoring center and to allow immediate activation of the deterrent device (s) in the event of detection of radio interference and intrusion.

To do this, the present invention mainly proposes a detection and alert device for an alarm system which comprises:

at least one intrusion detection device, a radio interference detection component on the ISM and GSM bands, processing means, calculation means and storage means, configured to process the signal supplied by the detection detector intrusion module and the first radio module to detect an intrusion and / or radio interference, a radio module comprising an ISM and LPWAN transmitting radio component and configured to transmit an alert signal either to a local alarm center in the ISM band on intrusion detection without radio interference, either to an LPWAN network in one-way mode in the event of radio interference detection with or without intrusion detection and an ISM receiving radio component;

electrical supply means.

According to a first embodiment, the radio interference detection component is the radio reception component ISM of the radio module.

According to an alternative embodiment, the radio module comprises an ISM reception radio component distinct from the interference detection radio component.

According to a particular embodiment, the intrusion detection device comprises a motion detector.

The motion detector may in particular comprise at least one of an infrared sensor, an ultra-sound sensor or a camera.

According to an alternative or complementary embodiment, the intrusion detection device comprises an opening sensor.

Advantageously, the detection device can include a connection with a deterrent device in order to activate the latter in the event of intrusion detection with radio interference.

Alternatively, the detection device can be integrated into a deterrent device and include means for activating the deterrent device in the event of intrusion detection with radio interference.

The deterrent device may include at least one of a siren, a smoke generator, a device for broadcasting a voice message.

Preferably, the LPWAN network is linked to a monitoring center.

The invention further relates to an alarm system comprising at least one detection device of the invention connected by the ISM means to a local alarm center.

The invention also proposes a method of implementing the detection and alert device which comprises:

a step of activating the detection device;

a standby step in which the detection device scans the intrusion detection device and the first radio module with a view to detecting intrusion and / or radio jamming events;

upon detection of an intrusion without detecting interference, an ISM communication step with a local alarm center which manages the alarm system and which takes charge of the management of the intrusion;

upon detection of radio interference without intrusion detection, a step of transmitting the interference information to a remote monitoring center by one-way LPWAN link;

upon detection of an intrusion and radio jamming, a step of transmitting the intrusion and jamming information to a remote monitoring center by one-way LPWAN link.

The detection and alert device being connected with a deterrent device, the method preferably includes a step of starting the deterrent device directly by the detection device upon detection by the intrusion detection device and jamming.

Preferably, the detection of radio interference includes a time delay adapted to filter the interference.

Brief description of the drawings

Other characteristics and advantages of the invention will become apparent on reading the following description of a nonlimiting example of embodiment of the invention with reference to the drawings which represent:

in Figures 1A and 1B: two exemplary embodiments of a device of the invention;

in FIG. 2: an example of an alarm system diagram equipped with the device of the invention operating normally in the absence of interference;

in Figure 3: the alarm system of Figure 2 in the presence of interference; in Figure 4: a radio module diagram applicable to the invention. Detailed description of embodiments of the invention

The main object of the detection device of the present invention is to make up for the security breach linked to the loss of communication between an alarm center with its sensors and with a remote monitoring center during radio jamming.

The actions that the device of the invention can perform in such a case are instantaneously activating the deterrent system and sending an alert to the central station if, when armed, it detects radio interference with or without intrusion. .

The detection and alert device 10 as described in FIG. 1A is made up of at least:

- a motion detector 1 either infrared or ultrasonic, or a double infrared-ultrasonic sensor for greater reliability;

- a radio component 2 for detecting interference on the ISM and GSM band;

- a radio module 4 provided with a transmission and reception component, adapted on the one hand to operate on the ISM band of the alarm system and comprising for this purpose the transmission protocols suitable for transmitting a frame of alert signal to the local alarm center of the system in normal mode, but adapted on the other hand in one-way transmission mode on an ISM frequency band such as the band 868 MHz in Europe and 902 MHz in the USA adapted to networks low-speed transmission LPWAN in English Low Power Wide Area Network, ie low power wide area networks external to the alarm system;

- processing means 3 T, calculation means C and storage means M such as a microcontroller-based computer provided with analog / digital and digital / analog conversion means, processing the signal supplied by the presence detector and by the radio interference detection component as well as control of the radio transmitter / receiver module for transmitting alarms according to the context;

- electrical supply means 5.

The example of FIG. 1B differs from that of FIG. 1A in that the radio module 6, which comprises a reception component 62 and a transmission component 61, performs the transmission / reception functions ISM, the function of jamming monitoring by scanning its reception part in addition to the ISM frame transmission / reception periods.

The radio module 4 of FIG. 1A or 6 of FIG. 1B is suitable for transmitting a low-speed type frame by radio to an LPWAN network.

On such a network, the transmission is done in one-way mode by a radio transmission generally at low speed. An example of a low speed network suitable for the invention is the ultra narrow band Ultra Narrow Band modulation network developed by the company SIGFOX which operates in the ISM band and which makes it possible to transmit messages with a bit rate of the order of 100 bits. per second over long distances with great robustness against noise and in particular interference.

Another example is the network using a protocol and a support according to the LoRa standard which is also suitable for the present application. Likewise, the device can also be programmed to use the networks known under the names Nwave, Ingénu or Weightless.

LPWAN low-speed network transmission takes place in the event of radio interference detection with or without intrusion. It should be noted that the jamming devices capable of being used against alarm systems affect the receivers of these systems by saturating them.

The interference therefore affects the alarm center but not the device of the invention in its LPWAN operating mode where it has only a one-way transmitter function. Likewise, the remote network receiver is not affected by the jammer used to disturb the alarm center and possibly GSM telephones. Indeed, the jammers used to disturb alarm systems have an action area of a few meters, or even a few tens of meters. Therefore, the reception of the information transmitted by the device of the invention is always possible by the remote receivers of the LPWAN networks.

FIG. 2 represents an architecture of a traditional alarm system to which the device of the invention is added.

The alarm system comprises sensors 11 A, 11 B, 11 C, 11 D, a central unit 15, a deterrent device 12, siren, smoke generator or broadcaster of voice messages for example and the device of the invention 10 .

The various sensors, deterrence device and device of the invention interact bidirectionally with the central unit according to a traditional established protocol. The central 15 is for its part regularly in bidirectional connection by the GSM network with a monitoring center 100 as known in the field.

FIG. 3 represents the same system, the elements of which are disturbed by a jamming device 60 which disturbs the receivers of the components 10, 11, 12, 15 of the alarm system and therefore breaks the bidirectional links both between the sensors, the device deterrent and the station only between the station and the monitoring center 100.

In this configuration, the device 10 of the invention is always able to send one or more unidirectional frames to the antennas 70 of the LPWAN network which retransmits the information to the monitoring center 100.

The device 10 can either be offered as a stand-alone product and in this case it is packaged in a small box powered by battery or possibly battery and solar collector having an interface for controlling an external device, siren, smoke generator, generator voice message, or it is directly integrated into the deterrent.

The operation of the device is as follows. If the device, while it is armed, detects radio jamming, it sends a radio jamming alarm to the monitoring center of the remote monitoring company and / or the owner of the installation or any other person on the LPWAN network. responsible for monitoring the premises and, if it also detects an intrusion, it will trigger the deterrent device that it controls (Siren, smoke generator, voice deterrent, ...)

The processing and calculation means are programmed to operate according to the following process when the device is armed in monitoring mode once put into operation:

carrying out a standby step in which the detection device scans the intrusion detection device and the first radio module with a view to detecting intrusion and / or radio jamming events in the form of a software loop also including a dialogue periodic with the alarm center;

upon detection of an intrusion without detection of jamming, start of an ISM communication step with a local alarm center which manages the alarm system and which takes charge of the management of the intrusion;

upon detection of radio interference, without intrusion detection, a step of transmitting the interference information to a remote monitoring center by one-way LPWAN link to inform it of a risky situation and trigger an appropriate reaction upon detection of an intrusion and a prolonged radio jamming, a step of transmission of the intrusion and jamming information to a remote monitoring center by one-way link LPWAN to inform of the intrusion with jamming.

In the latter case, the detection and alarm device being connected, by wire or infrared to avoid any radio interference, to the deterrent device or integrated into this device, the software of the device triggers a step of starting the device. of deterrence directly by the detection and alarm device of the invention.

Once the alarm has been triggered, the remote monitoring center will apply the instructions (Call from the owner or manager of the site, call from the police, etc.) and the deterrent will run its cycle, siren for a determined time, or send smoke or voice messages.

It should be noted that the jamming detection is carried out for example by means of a timed loop comprising a succession of detections of confirmation of the presence of jamming to eliminate false detections such as jamming due to starts of electric motors, fault two-wheel interference suppression or other unwanted interference.

The device of the invention, which must be distinct from the local alarm center, the destruction of which is generally the priority target of burglars using jammers, can be hidden so as not to be spotted and continue to transmit in the event that the plant would be destroyed. In particular, the device of the invention can for example be arranged so as to monitor access to the power station.

FIG. 4 gives an example of an integrated radio module usable in the context of the invention. This module comprises, from the external antenna 200,:

a first transmission / reception switch 201 separating a reception channel with an RF bandpass filter 202, a low noise amplifier 203 and a transmission channel with a power amplifier 204 and a driver 205;

- a second transmit / receive switch receiving or supplying a common part to the transmit / receive with an RF bandpass 207, a mixer 209 on which a signal comes from an RF frequency synthesizer 208, a bandpass on intermediate frequency 210;

a third switch 211 supplying a reception part provided with an intermediate frequency amplifier 212, a mixer 214, on which a signal emitted by a generator F1 216 arrives, and a low pass filter BF 217 and receiving a signal from a part transmitter provided with an amplifier F1 213, a mixer 215 and a band pass filter F1 218.

The LF signals received are converted by an analog / digital converter 301 of the processing means 3 to be processed according to the operating mode of the device.

The LF signals emitted come from a digital / analog converter 302 of the processing means 3.

Similarly, the switches are controlled by the processing means as a function of the program phase carried out.

In the case where such a module is used to detect interference, the processing means scan the output of the converter 303 to detect prolonged saturation of the output of the receiver.

As seen above, the module in FIG. 4 can be dedicated to transmissions / receptions, a simple annex receiver module used for detecting interference.

The invention is not limited to the examples shown and in particular as said above, the detection and alert device of the invention can be integrated into equipment of the alarm system other than the central unit such as a device deterrent.

Claims (14)

1 - Device (10) for detection and alert for an alarm system characterized in that it comprises: at least one intrusion detection device (1), a radio component (2, 42) for detecting interference on the ISM and GSM bands, processing means, calculation means and storage means (3), configured for processing the signal supplied by the intrusion detection detector and the first radio module in order to detect an intrusion and / or radio interference, a radio module (4, 6) comprising a radio transmission component (41, 61) ISM and LPWAN and configured to transmit an alert signal either to a local alarm center in the ISM band on intrusion detection without radio interference, or to an LPWAN network in unidirectional mode in the event of radio interference detection with or without intrusion detection and an ISM receiving radio component (42, 62); electrical supply means. 2 - Device (10) for detection and alert for alarm system according to claim 1 for which the radio component (42) for jamming detection is the radio component receiving ISM of the radio module. 3 - Device (10) for detection and alert for alarm system according to claim 1 for which the radio module (4) comprises a radio receiving component (42) ISM distinct from the radio component (2) for jamming detection . 4 - Detection and alert device according to claim 1, 2 or 3 characterized in that the intrusion detection device (1) comprises a movement detector. 5 - Detection and alert device according to claim 4 characterized in that the movement detector comprises at least one of an infrared sensor, an ultra sound sensor or a camera. 6 - Detection and alert device according to any one of the preceding claims, characterized in that the intrusion detection device (1) comprises an opening sensor. 7 - Detection and alert device according to any one of the preceding claims, characterized in that it comprises a connection with a deterrent device (12) in order to activate the latter in the event of intrusion detection with radio jamming . 8 - Detection and alert device according to any one of claims 1 to 6 characterized in that it is integrated into a deterrent device (12) and comprises means for activating the deterrent device in the event of detection intrusion with radio jamming. 9 - Detection and alert device according to claim 7 or 8 characterized in that the deterrent device (12) comprises at least one of a siren, a smoke generator, a device for broadcasting a voice message. 10- An alarm system comprising a detection and alert device according to any one of the preceding claims for which the LPWAN network is connected to a remote monitoring center (100). 11 - Alarm system comprising at least one detection and alert device according to any one of the preceding claims for which the device is connected by the ISM means to a local alarm center (15). 12- Method for implementing a detection and alert device according to any one of the preceding claims, characterized in that it comprises: a step of activating the detection device; a standby step in which the detection device scans the intrusion detection device and the first radio receiver component with a view to detecting radio intrusion and / or interference events; upon detection of an intrusion without jamming detection, an ISM communication step with a local alarm center which manages the alarm system and which manages the intrusion; upon detection of radio interference without intrusion detection, a step of transmitting the interference information to a remote monitoring center by one-way LPWAN link; upon detection of an intrusion and radio jamming, a step of transmitting the intrusion and jamming information to a remote monitoring center by one-way LPWAN link. 13- The method of claim 10 for which the detection and alert device being connected with a deterrent device or integrated in a deterrent device, the method comprises a step of starting the deterrent device directly by the device detection on detection 5 of intrusion and jamming by the detection device. 14- The method of claim 12 or 13 for which the detection of radio interference includes a time delay adapted to filter parasitic interference.