GB2457102A - Wireless intruder alarm with pressure sensor within double glazing unit - Google Patents

Wireless intruder alarm with pressure sensor within double glazing unit Download PDF

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Publication number
GB2457102A
GB2457102A GB0802056A GB0802056A GB2457102A GB 2457102 A GB2457102 A GB 2457102A GB 0802056 A GB0802056 A GB 0802056A GB 0802056 A GB0802056 A GB 0802056A GB 2457102 A GB2457102 A GB 2457102A
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United Kingdom
Prior art keywords
signal
alarm
event
transmitter
intruder
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Withdrawn
Application number
GB0802056A
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GB0802056D0 (en
Inventor
George Schaar
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB0802056A priority Critical patent/GB2457102A/en
Publication of GB0802056D0 publication Critical patent/GB0802056D0/en
Publication of GB2457102A publication Critical patent/GB2457102A/en
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/04—Mechanical actuation by breaking of glass
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/10—Mechanical actuation by pressure on floors, floor coverings, stair treads, counters, or tills
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/001—Alarm cancelling procedures or alarm forwarding decisions, e.g. based on absence of alarm confirmation
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/009—Signalling of the alarm condition to a substation whose identity is signalled to a central station, e.g. relaying alarm signals in order to extend communication range
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/12—Checking intermittently signalling or alarm systems
    • G08B29/123—Checking intermittently signalling or alarm systems of line circuits
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/16—Security signalling or alarm systems, e.g. redundant systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/20—Countermeasures against jamming
    • H04K3/22—Countermeasures against jamming including jamming detection and monitoring
    • H04K3/224—Countermeasures against jamming including jamming detection and monitoring with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer
    • H04K3/226—Selection of non-jammed channel for communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/80—Jamming or countermeasure characterized by its function
    • H04K3/88—Jamming or countermeasure characterized by its function related to allowing or preventing alarm transmission

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Alarm Systems (AREA)

Abstract

An intruder alarm comprises one or more alarm sensors 10 able to send a wireless signal at a first frequency to a central alarm control 10. The wireless alarm sensors comprise a pressure sensor and transmitter (22,23 fig 2) preferably arranged within the sealed volume formed by two glazing panes (21 fig 2) of a double glazing unit. Preferably the sealed volume is at a higher or lower pressure than the external atmospheric pressure so that a broken pane causes a significant pressure change. The alarm may be triggered by a pressure change over a fixed time that is greater than a threshold. A temperature sensor and an anti tamper switch may additionally be included with the alarm sensor. A wireless repeater 14 may be provided that can rebroadcast the alarm signals at a different radio frequency from that of the alarm sensors 10. The repeater 14 may detect jamming and then transmit a jamming alert at a frequency other than the jamming frequency. Preferably the wireless alarm sensors have a unique ID and the controller can display 17 the status of all protected double glazing units.

Description

BURGLAR ALARM
BACKGROUND
a. Field of the Invention
This invention relates to a method an apparatus for detecting intruders and for alerting a homeowner accordingly.
Burglary is becoming an increasing problem in the UK and it is estimated that there are over 1500 break-in on average each day.
SUMMARY OF THE INVENTION
According to the invention there is provided a unit for use in an intruder alarm comprising: a pressure sensor; and a transmitter; in which the pressure sensor sends a signal to the transmitter in the event that a pressure change greater than a predetermined threshold occurs causing the transmitter to transmit a signal of a first predetermined frequency.
Preferably, in the event that a pressure rise greater than a predetermined * ** threshold occurs within a predetermined time causes the transmitter is used to :::::: transmit a signal of a first predetermined frequency Preferably the unit further comprises a solar powered cell to provide power to said sensor and said transmitter.
*..: Preferably the unit further comprise a temperature sensor and in which the temperature sensor sends a signal to the transmitter in the event that a temperature change greater than a predetermined threshold occurs within a predetermined time the transmitter is caused to transmit an intruder alert signal at said first predetermined frequency.
Preferably the unit further comprises a tamper switch, and in which in the event that the tamper switch is activated the transmitter is caused to transmit a tamper alert signal at said first predetermined frequency.
According to another aspect of the invention there is provided a pressurised unit comprising: at least two panes of glass sealed to enclose a space: and a unit as described above enclosed in said space.
According to another aspect of the invention there is provided an alarm system comprising: a such a pressunsed unit: a central computer connected to a receiver for receiving said signal and arranged to send data to said central computer in the event that an intruder alert signal of the first predetermined frequency is received.
Preferably the alarm system further comprises an audible alarm for sounding the alarm in the event that said intruder alert signal is received.
Preferably to increase the range and to provide a back up a repeater for receiving said intruder alert signal and in the event an intruder alert signal is received the repeater is arranged to transmit an intruder alert signal at a second predetermined frequency, and in which the central computer is arranged to activate the audible * ** alarm in the event that an intruder alert signal of the first predetermined frequency or an intruder alert signal of the second predetermined frequency is received.
Preferably the repeater is arranged to detect a jamming signal and to transmit a jamming alert signal at a frequency other than a jammed frequency in the event ::: that a jamming signal is detected. . * .. In a preferred embodiment there is a pager controller in which the central computer requests the pager controller to send a message to one or more pagers in the event that an intruder alarm signal is received.
In an alarm system comprising a plurality of pressunsed units it is an advantage if each of said units has a unique identifier and further comprising a display for displaying the status of said one or more units.
In a preferred embodiment the pressunsed unit is a double glazed unit.
According to the invention there is also provided a method of detecting breakage of a pressurised unit comprising the steps of: regularly measuring the pressure inside the unit; in the event that a pressure change greater than a predetermined threshold is detected, transmitting a signal for use by an alarm system.
Preferably if a pressure rise greater than a predetermined threshold within a predetermined time is detected, transmitting a signal for use by an alarm system. * ** * * * * ** * S **** ** * * * S * SS
S S..
S S S* * *S S. S S. S.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 is an illustration of an alarm system in accordance with the present invention; Figure 2 is an illustration of part of a double glazed unit.
Figure 3 shows a sensor transmitter fitted into a double glazed unit; and Figure 4 shows a circuit diagram of a sensor transmitter according to the present invention.
DETAILED DESCRIPTION
Referring now to Figure 1, an alarm system I comprises a central computer 15 which is used to manage and control the operation of the alarm system.
The central computer 15 is administered by a supervisor who has total authority, the computer is password protected for security. The central computer 15 is initially configured by adding uniquely identified sensor transmitters 10 to the central records and recording the location of each sensor transmitter. It is possible * * to delete references to particular sensor transmitters if desired. The central computer 15 stores records (in an SQL database) of all events which occur in the alarm system, such as receipt of intruder alarms, cancellation of intruder alarms, *. 25 possible faults in the system etc. ***
I
A plurality of sensor transmitters 10 which will be described later in more detail, are configured to transmit an intruder alert signal when an intruder event is *..: detected. The intruder alert signal is transmitted as a 315 Hz radio frequency signal and is received by a 315 MHz receiver 12. In order to increase the range of the signal and to provide some back up a repeater 14 also receives the signal.
Upon receipt of the 315 MHz signal the repeater 14 sends a second signal at 433MHz which is received by a 433MHz receiver. Upon receipt of an intruder alert signal both receivers 12, 16 send a signal to the Central computer 15 to indicate that an intruder event has been detected.
The particular frequencies used are user configurable so that radio communication rules in different countries or other local conditions can be taken into consideration.
The central computer 15 receives and records signals from the receivers 12, 16 and determines the type of these signals (different types of signal will be discussed later). In response to an alarm signal from either or both receivers 12, 16 the central computer 15 displays an alarm event on the screen, and also sets a status display 17 and sounds an audible alarm 19.
The repeater 14 also serves as a vicious signal detector and is used to detect any jamming signal'. This is to prevent a potential intruder from jamming an intruder alert signal and preventing the central computer 15 being informed of a potential intruder situation. In the event that a jamming signal is detected by the repeater 14 then the central computer 15 is informed accordingly by transmission of a signal at a non-jammed frequency.
* , Each sensor transmitter 10 has a unique identifier. When the system is configured the central computer 15 records the location of each sensor transmitter 10. Upon S...
receipt of an intruder alert signal the location of the sensor transmitter generating the intruder alert signal is displayed on the central computer screen. The display may be textual, or may show the location of the alarm on a two or three * dimensional visual representation.
*.. One or more intruder alerts may be sent out to one or more remote pagers 11 via a pager controller 13 in dependence upon parameters configured by the central computer 15. This would allow somebody remote from the location of the audible alarm (even out of the country), and hence out of earshot, to be made aware of an Intruder alert.
An alarm may be switched of, either at the central computer 15, or by receipt of a signal from one of the pagers 11 via the pager controller 13.
For system robustness, the central computer 15 polls the receivers 12, 16 and the pager control 13 every hour. If no response is received a possible fault is recorded. The repeater 14 sends a beacon signal once per hour. If the central computer 15 has not received a beacon signal for two hours then a possible fault is recorded.
The central computer 15 may be connected to an external network (for example the Internet) via a wireless connection in order to allow remote connection to the central computer. This would allow remote monitoring of the alarm status, and would allow alarm statistics to be uploaded to a central server.
In this case it would be possible for the central computer to act as a client and in fact run the software on a remote server.
In either case of receipt of an intruder alert by a remote pager, or by a remotely connected monitor it would be possible to send an emergency response as a result. * *S * * * * ** S...
Double glazed units suitable for use in household windows will now be described with reference to Figure 2. * *
Double (or even triple) glazed units, often referred to as insulated glazing units, are commonly used in household to improve heat insulation by improving the : thermal performance of a window in which the unit is installed.
A set of two or more panes of glass are spaced apart and hermetically sealed to form a glazed unit with an air (or gas) space between the planes of glass. It is the air space between the glass layers that provides the insulation.
Such units may be framed in a sash or frame, for example. Insulting glazed units are often used when replacement windows are required.
The space between the panes may be filled with air or an inert gas such as argon or krypton which would provide better insulating performance.
Typically a spacer is filled with desiccant to prevent condensation and improve insulating performance. In modern units, most of the air or gas is removed, leaving a partial vacuum, which drastically reduces heat transfer through convection and conduction. This is called evacuated glazing, and is used in the preferred embodiment of the present invention where a unit is first evacuated and then argon is injected to a pressure which is substantially below that of atmospheric pressure.
Figure 2 illustrates a cross section of part of a side of a double glazed unit 20 in preferred embodiment, comprising two panes of 4mm glass 21 which are separated by a spacer 22 filled with desiccant 23 and sealed with a silicone seal 24. the space between the panes is preferably in the range 14mm -28mm.
* ** Although this invention has been described with reference to double glazed units it will be appreciated that any sealed unit having an internal pressure different from (ie either greater than or less than) an external pressure such as atmospheric *:*. 25 pressure may be used in the present invention. *
Figure 3 illustrates a sensor transmitter 10 sealed into a corner of a double glazed unit 30. The sensor transmitter 10, in the preferred embodiment of the invention, *:*. measures approximately 80mm x 45 mm. So the sensor is relatively unobtrusive when installed. The sensor/transmitter is installed during manufacture of the double glazed unit.
Referring now to Figure 4, a sensor transmitter 10 will be described in more detail.
The sensor transmitter is powered by a power source which in the preferred embodiment of the invention is a solar powered source which will provided power for between 3 and seven day in the event of low illumination levels. A battery backup may also be provided. When the sensor transmitter 10 is received power a status Light Emitting Diode (LED) 45 is illuminated. In the preferred embodiment of the invention, the status LED 45 is coloured green.
A pressure sensor 41 monitors the pressure around the sensor transmitter 10. A measurement of the pressure is sent to a processor 42. The processor 42 regularly compares the pressure measurement to a predetermined threshold. If the measured temperature changes from a value lower than the predetermined threshold to a value higher than the threshold within a predetermined period of time, then a signal is sent to a radio transmitter 43. The processor 44 also sends a pressure alert signal to an alarm LED 46 to turn the LED on. In the preferred embodiment of the invention the LED is coloured red.
The predetermined pressure is set to a user defined value, and in the preferred embodiment of the invention the threshold is set to 0.5 atmospheres. The predetermined time is set to a user defined value and in the preferred embodiment *:::* of the invention is set to one second. I...
A tamper switch 43 is also included, which will send a tamper signal to the processor 44 in the event that the switch is released from the closed position.
The radio transmitter 42 transmits a signal at a predetermined frequency. A signal transmitted by the radio transmitter 42 comprises a predetermined identifier which uniquely identifies each sensor transmitter 10 in an alarm system and the signal may be one of a predetermined number of types for example alarm' when a pressure alert signal is received from the processor 44, tamper', when a tamper alert signal is received. The signal types may also include interconnection' which is simply a heartbeat signal which is regularly sent to assure a monitor that the sensor transmitter is still active. Use of a heartbeat signal is optional as if there are a large number of sensor transmitters in a system then there may be interference with one another. The predetermined frequency is 315MHz in the preferred embodiment of the invention, as has been mentioned before.
In one embodiment of the invention the sensor transmitter 10 also includes a temperature sensor (not shown) which causes the radio transmitter 42 to send a temperature alarm signal in the event that a temperature change greater than a predetermined threshold is sensed within a predetermined time. Again, the predetermined threshold and the predetermined time are user defined when the sensor transmitter is configured.
A useful feature of the sensor transmitter 10 is that there is no on-off switch and there are no physical connection requirements so the sensor transmitter can be built into a double glazed unit at the time of manufacture.
It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also *:*::* be provided separately, or in any suitable combination. * .**
It is to be recognised that various alterations, modifications, and/or additions may *:*. 25 be introduced into the constructions and arrangements of parts described above without departing from the scope of the present invention as defined in the ::::. appended claims.

Claims (18)

-10 - CLAIMS
1. A unit for use in an intruder alarm comprising: a pressure sensor; and a transmitter; in which the pressure sensor sends a signal to the transmitter in the event that a pressure change greater than a predetermined threshold occurs causing the transmitter to transmit a signal of a first predetermined frequency.
2. A unit according to claim 1, in which in the event that a pressure rise greater than a predetermined threshold occurs within a predetermined time causes the transmitter is used to transmit a signal of a first predetermined frequency
3. A unit according to claim 1 or claim 2 further comprising a solar powered cell to provide power to said sensor and said transmitter.
4. A unit according to any one of claims I to 3, further comprising a temperature sensor and in which the temperature sensor sends a signal to the transmitter in the event that a temperature change greater than a predetermined threshold occurs within a predetermined time the transmitter is caused to transmit an intruder alert signal at said first predetermined frequency. * **
5. A unit according to any one of the preceding claims further comprising a tamper switch, and in which in the event that the tamper switch is activated the transmitter *:*. 25 is caused to transmit a tamper alert signal at said first predetermined frequency.
S *
6. A pressurised unit comprising: *:*. at least two panes of glass sealed to enclose a space; and *:*. a unit according to any one of the preceding claims enclosed in said space. -Il -
7. An alarm system comprising: a pressurised unit according to claim 6; a central computer connected to a receiver for receiving said signal and arranged to send data to said central computer in the event that an intruder alert signal of the first predetermined frequency is received.
8. An alarm system according to claim 7, further comprising an audible alarm for sounding the alarm in the event that said intruder alert signal is received.
9. An alarm system according to any one of claims 6 to 8, further comprising a repeater for receiving said intruder alert signal and in the event an intruder alert signal is received the repeater is arranged to transmit an intruder alert signal at a second predetermined frequency, and in which the central computer is arranged to activate the audible alarm in the event that an intruder alert signal of the first predetermined frequency or an intruder alert signal of the second predetermined frequency is received.
10. An alarm system according to claim 9, in which the repeater is arranged to detect a jamming signal and to transmit a jamming alert signal at a frequency other *:*::* than a jammed frequency in the event that a jamming signal is detected. 0*S*
11. An alarm system according to any one of claims 6 to 10, further comprising *.: 25 a pager controller in which the central computer requests the pager controller to :. send a message to one or more pagers in the event that an intruder alarm signal is received.
S * * * * **
12. An alarm system according to any one of claims 6 to 11, comprising a plurality of pressurised units and in which each of said units has a unique identifier and further comprising a display for displaying the status of said one or more units. -12-
13. An alarm system according to any one of claims 6 to 12 in which the pressunsed unit is a double glazed unit.
14. An alarm system substantially as herein described with reference to the accompany drawings.
15. A sensor transmitter substantially as herein described with reference to the accompanying drawings.
16. A method of detecting breakage of a pressurised unit comprising the steps of: regularly measuring the pressure inside the unit; in the event that a pressure change greater than a predetermined threshold is detected, transmitting a signal for use by an alarm system.
17. A method according to claim 16 in which in the event that a pressure rise greater than a predetermined threshold within a predetermined time is detected, transmitting a signal for use by an alarm system.
18. A method substantially as herein described with reference to the accompanying drawings. * ** ** * * ** S... * S * **. *5 S * . S * S.
I S..
S
S
* . S -S *S S. S S* S.5
GB0802056A 2008-02-04 2008-02-04 Wireless intruder alarm with pressure sensor within double glazing unit Withdrawn GB2457102A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0802056A GB2457102A (en) 2008-02-04 2008-02-04 Wireless intruder alarm with pressure sensor within double glazing unit

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Application Number Priority Date Filing Date Title
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GB2457102A true GB2457102A (en) 2009-08-05

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WO2011071816A1 (en) * 2009-12-08 2011-06-16 Glasslogic Multi -sheet glazing unit with internal sensor
WO2011084608A1 (en) * 2009-12-21 2011-07-14 Continental Automotive Systems, Inc. Apparatus and method for maintaining communication with stolen vehicle tracking device
US8175573B2 (en) 2009-12-21 2012-05-08 Continental Automotive Systems, Inc. Apparatus and method for maintaining communications with a vehicle in the presence of jamming
EP2515282A1 (en) 2011-04-21 2012-10-24 Securitas Direct AB Security system
US8319615B2 (en) 2009-12-21 2012-11-27 Continental Automotive Systems, Inc. Apparatus and method for detecting jamming of communications
US8320872B2 (en) 2009-12-21 2012-11-27 Continental Automotive Systems, Inc. Apparatus and method for broadcasting the detection of RF jammer presence
CN102854907A (en) * 2012-08-03 2013-01-02 福建升腾资讯有限公司 Tamper circuit based on STM32 chip
EP2541518A1 (en) 2011-07-01 2013-01-02 Securitas Direct AB A method for supervising intruder alarm systems
WO2013142962A1 (en) * 2012-03-28 2013-10-03 Tyco Safety Products Canada Ltd. Anti-tamper systems and methods
US8611847B2 (en) 2009-12-21 2013-12-17 Continental Automotive Systems, Inc. Apparatus and method for detecting communication interference
US8639209B2 (en) 2009-12-21 2014-01-28 Continental Automotive Systems, Inc. Apparatus and method for detecting a cloned base station
US8884821B2 (en) 2009-12-21 2014-11-11 Continental Automotive Systems, Inc. Apparatus and method for determining vehicle location
US8896431B2 (en) 2009-12-21 2014-11-25 Continental Automotive Systems, Inc. Apparatus and method for compromised vehicle tracking
CN104268467A (en) * 2014-09-15 2015-01-07 福建联迪商用设备有限公司 Anti-intrusion method for electronic equipment and anti-intrusion electronic equipment
CN104268466A (en) * 2014-09-15 2015-01-07 福建联迪商用设备有限公司 Anti-invasion electronic device and anti-invasion method thereof
US9031538B2 (en) 2012-02-16 2015-05-12 Continental Automotive Systems, Inc. Method and apparatus to determine if a cellular jamming signal is malicious or non-malicious based on received signal strength
US9102293B2 (en) 2009-12-21 2015-08-11 Continental Automotive Systems, Inc. Apparatus and method for reducing false alarms in stolen vehicle tracking
US9338677B2 (en) 2012-03-12 2016-05-10 Securitas Direct Ab Method for synchronizing state information of a home wireless system
EP3091519A1 (en) 2015-05-08 2016-11-09 Securitas Direct AB Jamming detection method and device
US9905120B1 (en) 2016-08-29 2018-02-27 At&T Digital Life, Inc. Alarm initiation when sensor is intentionally jammed
US9947209B2 (en) 2014-04-10 2018-04-17 Armco Key Security Limited Window alarm
US10027682B2 (en) 2009-12-21 2018-07-17 Continental Automotive Systems, Inc. Apparatus and method for detecting a cloned base station
WO2019028429A1 (en) * 2017-08-03 2019-02-07 Stephen Scott Trundle System and method for triggering an alarm during a sensor jamming attack
EP3477611A1 (en) * 2017-10-26 2019-05-01 Telecom Design Detection and alert device for alarm system and alarm system comprising same
EP3522130A1 (en) 2018-02-02 2019-08-07 Verisure Sàrl A method and a system for early detecting jamming of intruder alarm systems
EP3543976A1 (en) 2018-03-21 2019-09-25 Verisure Sàrl A method for increasing specificity of jamming detection in a home alarm system

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US4755800A (en) * 1987-07-13 1988-07-05 John M. Marshall Window security device
DE4309006A1 (en) * 1993-03-20 1994-09-22 Stewing Nachrichtentechnik Wireless data transmission device
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