WO2005013228A1 - Systeme de securite radiofrequence - Google Patents

Systeme de securite radiofrequence Download PDF

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Publication number
WO2005013228A1
WO2005013228A1 PCT/GB2004/003307 GB2004003307W WO2005013228A1 WO 2005013228 A1 WO2005013228 A1 WO 2005013228A1 GB 2004003307 W GB2004003307 W GB 2004003307W WO 2005013228 A1 WO2005013228 A1 WO 2005013228A1
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WO
WIPO (PCT)
Prior art keywords
signal
transmitter
module
transmitter module
receiver
Prior art date
Application number
PCT/GB2004/003307
Other languages
English (en)
Inventor
Leonard Marmaduke Steele
Andre Hyczkiewicz
Terence Mcnelly
Original Assignee
Intelligent Personal Security Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Intelligent Personal Security Limited filed Critical Intelligent Personal Security Limited
Priority to EP04743628A priority Critical patent/EP1656651A1/fr
Priority to GB0602969A priority patent/GB2420437B/en
Publication of WO2005013228A1 publication Critical patent/WO2005013228A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/10—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device
    • B60R25/102—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles actuating a signalling device a signal being sent to a remote location, e.g. a radio signal being transmitted to a police station, a security company or the owner
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • 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
    • 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
    • G08B29/06—Monitoring of the line circuits, e.g. signalling of line faults
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R2325/00—Indexing scheme relating to vehicle anti-theft devices
    • B60R2325/10—Communication protocols, communication systems of vehicle anti-theft devices
    • B60R2325/105—Radio frequency identification data [RFID]

Definitions

  • the present invention relates to a radio-frequency security system and to a portable remote alarm device in particular.
  • Radio-frequency (RF) based devices are widely used for wireless security or locating systems.
  • RFID tags provide a way to locate or monitor the location of a target that has been appropriately tagged.
  • a central unit, or server is typically in communication with a number of such tags.
  • the tags may be predominantly passive devices or may be capable of independent communication with the central unit.
  • the RF range of the electromagnetic spectrum has the advantage of penetration through objects which are opaque to optical wavelengths (e.g. ultra-violet, visible, infra-red), and is therefore not restricted to a direct line of sight. Of course, signal strength reduces with propagation distance and passage through objects. Similar technology has been employed for security purposes, to activate alarm systems or communicate security violations.
  • a vehicle alarm can be armed/disarmed and an engine immobiliser activated/deactivated remotely.
  • RF transponders are often fitted to vehicles to convert electronic coded signals into an RF signal that can be transmitted to a receiver, such as a key fob or a central monitoring server. In this way, a single central unit may monitor the location and status of a large number of vehicles. A particular vehicle may be paged to indicate its location amongst the other vehicles or else its absence from the monitored area.
  • the RF transponder within a vehicle will be a permanent installation powered from the car battery and coupled to many of the vehicles systems. In this way, the transponder can not only communicate status information to the central server but may also activate/deactivate the vehicle systems in response to a security violation.
  • One approach to this issue is for the transmitter to continuously transmit some form of test signal, which is received by the receiver and an indication given that the signal either has or has not been received.
  • the central server or a user if carrying a portable receiver, can be sure that the RF link is in tact and will be operational when needed.
  • the problem with this "always-on" approach is the continual power drain on the transmitter's power source, which means that either the system will suffer from a significantly reduced lifetime or else the transmitter must be connected to a high capacity source, such as a vehicle battery. The system will generally then require professional installation.
  • An additional problem relates to the arming or activation of the security system.
  • a radio-frequency (RF) communication system comprises: a transmitter module, which comprises an RF transmitter for generating and emitting an RF communications signal, in use the transmitter module transmitting a pulsed RF test signal at discrete time intervals; and, a receiver module, which comprises an RF receiver for receiving an RF communications signal and means for indicating the status of an RF communications link between the transmitter module and the receiver module in dependence on the pulsed RF test signal, thereby, in use, verifying the integrity of the RF communications link.
  • a transmitter module which comprises an RF transmitter for generating and emitting an RF communications signal, in use the transmitter module transmitting a pulsed RF test signal at discrete time intervals
  • a receiver module which comprises an RF receiver for receiving an RF communications signal and means for indicating the status of an RF communications link between the transmitter module and the receiver module in dependence on the pulsed RF test signal, thereby, in use, verifying the integrity of the RF communications link.
  • the receiver indication means can indicate either that the RF test signal has been successfully received during a discrete time interval or that the RF test signal has not been successfully received during a discrete time interval.
  • the ratio of a period between consecutive RF test signals to the test signal duration i.e. a duty cycle is at least 100:1.
  • an RF security system comprises an RF communications according to the first aspect, the transmitter module further comprising means for generating and emitting an RF alarm signal which can be received by the receiver module over the RF communication link. In this way, a security system is provided which uses an RF link, the integrity of which is regularly tested.
  • a transmitter module for use in a system according to the first or second aspect comprises computer executable code for performing the step of automatically transmitting a pulsed RF test signal at discrete time intervals for verifying the availability of an RF communications link.
  • a method for monitoring the status of an RF communications link between a transmitter module and a receiver module comprises the steps of: generating and emitting from the transmitter module a pulsed RF test signal at discrete time intervals; and, indicating at the receiver module the status of the RF communications link in dependence on the test signal.
  • a system according to the first aspect may verify the integrity of an RF communications link.
  • an RF security system comprises: a transmitter module, which comprises an RF transmitter for generating and emitting an RF communications signal including an RF alarm signal which can be received by a receiver module over an RF communication link; and, a receiver module, which comprises an RF receiver for receiving an RF communications signal including an RF alarm signal, and means for indicating that the RF alarm signal has been received; wherein, in use, the alarm indication means becomes operable when the strength of an RF signal transmitted by the transmitter has fallen below a predetermined value or has fallen by a predetermined factor at the receiver.
  • the security system is self-arming based on transmitter-receiver proximity, thereby removing the need for manual arming by a human operator who may be fallible. More accurately, the alarm system is actually self-inhibiting for a certain signal strength, thereby satisfying the "always-on" criterion required by many insurers.
  • the RF security system comprises an RF communication system according to the first aspect, thereby allowing the integrity of the RF communications link to be verified.
  • the RF signal strength is modified in dependence on the presence or absence of an external stimulus. This enables conservation of battery power when, for example, a particular stimulus such as vehicle motion is present, and signal strength is only increased when the stimulus is absent.
  • a receiver module for use in a system according to the fourth aspect comprises computer executable code for performing the step of enabling the alarm indication means when the strength of an RF signal transmitted by a transmitter has fallen below a predetermined value or has fallen by a predetermined factor at the receiver.
  • a transmitter module for use in a system according to the fourth aspect comprises computer executable code for performing the step of modifying the strength of an RF signal emitted by the transmitter in dependence on the presence or absence of the external stimulus.
  • a method for remotely enabling an RF security system comprising a transmitter module and a receiver module, the receiver module having an alarm indication means for indicating the reception of an RF alarm signal transmitted by the transmitter module, comprising the steps of: generating and emitting from the transmitter module an RF signal; and, enabling the alarm indication means when the strength of the RF signal transmitted by the transmitter has fallen below a predetermined value or has fallen by a predetermined factor at the receiver.
  • an RF security system according to the seventh aspect may be remotely enabled.
  • a method for conserving power usage in an RF transmitter module comprising a power source, an RF transmitter for generating an RF communications signal, and a sensor for responding to an external stimulus, the method comprising the steps of: generating and emitting from the transmitter module the RF communications signal having a first RF power level in dependence on the presence, or absence, of the external stimulus; and, generating and emitting from the transmitter module the RF communications signal having a second RF power level in dependence on the absence, or presence, respectively, of the external stimulus; the first power level being lower than the second power level, thereby reducing consumption of power from the power source when the external stimulus is present, or absent, respectively.
  • battery power in an RF transmitter module may be conserved when, for example, a particular stimulus such as vehicle motion is present. Signal strength would be increased when the stimulus is absent.
  • Figure 1 shows RF communications link between a transmitter module and a receiver module
  • Figure 2 shows a periodic KIT test signal according to the present invention
  • Figure 3 shows a KIT pulse with a ramped leading and trailing edge
  • Figure 4 shows an encoded KIT pulse and the corresponding internal receiver KIT signal
  • Figure 5 shows a periodic KIT pulse with alarm pulse during the dwell period
  • Figure 6 shows the internal architecture of a transmitter module
  • Figure 7 shows 16-bit Manchester encoding
  • Figure 8 shows the internal architecture of a receiver module
  • Figure 9 shows an operational flow chart for a vehicle alarm transmitter module
  • Figure 10 shows an operational flow chart for a vehicle alarm receiver module
  • Figure 11 shows RF signal strength monitoring in a receiver module
  • Figure 12 shows the RF signal strength trigger level for disabling the receiver alarm indicators
  • Figure 13 shows the internal architecture of another transmitter module
  • Figure 14 illustrates the external form of the transmitter module
  • Figure 15 shows the internal architecture of another receiver module
  • Figure 16 illustrates typical
  • the present invention is directed towards the provision of a reliable radio- frequency (RF) communications link 10 between a transmitter module 11 and a receiver module 12, as shown in Figure 1, and its application to a remote security alarm system.
  • a key aspect of the invention is the emission of a pulsed RF test signal 13 by the transmitter module at discrete time intervals to check the integrity of the RF communications link between transmitter and receiver.
  • This signal is known as the "keep- in-touch" (or KIT) signal.
  • Figure 2 illustrates the RF timing diagram for a typical KIT signal.
  • the KIT signal comprises a short burst of RF radiation 20 (carrier wave active period) followed by a comparatively long dwell period 21. This signal will usually be repeated in a periodic manner 22, although it does not have to be periodic.
  • the KIT signal comprises a short burst of RF radiation 20 (carrier wave active period) followed by a comparatively long dwell period 21. This signal will usually be repeated in a periodic manner 22, although it does not have to be periodic.
  • the KIT signal may operate with a wide range a duty cycle, i.e. the ratio of the period between consecutive RF test signals to the test signal duration. For example, a duty cycle of 100: 1 ensures a test pulse is active for 1/100 of the time. However, such a duration is unnecessary and places a larger drain on the transmitter power supply.
  • a duty cycle of around 6000:1 is a good compromise, permitting the RF link to be tested every minute with a short 10ms burst.
  • the RF link may be operated on a range of carrier frequency, including both specifically allocated frequencies and license exempt bands.
  • the frequency of choice will generally be a compromise between an available band and a frequency that is characterized by significant physical penetration through obstacles, in order to ensure maximum range of operation.
  • One such long wave RF frequency, occupying a license exempt band is centered at 869.4 MHz.
  • the carrier wave may be modulated with data (encoded KIT signal) 40, which may represent an address or other information. Any conventional modulation technique may be employed, including amplitude, phase and frequency modulation.
  • a preferred technique is frequency shift key (FSK) modulation.
  • the receiver module checks for successful reception of a KIT signal within each time period and then indicates either the presence or absence of the signal. In this way, the RF link is tested at frequent regular intervals, but without excessively draining the power supply.
  • the receiver module has an internal KIT signal 41, which is kept high 42 as long as a KIT test signal has been received within the previous test period. This internal KIT signal only goes low 43 when a KIT test signal has not been received within the previous test period. Of course, alternatively the internal signal may switch from low to high. In dependence on this internal signal the receiver module then indicates either the presence or absence of the signal.
  • This indication may be in the form of a visible or audible signal directed at the user and may be continuous or discrete.
  • the receiver module will preferably indicate briefly that a KIT test signal has been successfully received. In this way, it need not matter to the user why the test signal has not been received, but simply that for some reason the integrity of the RF link has been compromised. The actual reason may be a component or power failure, or else the receiver module is out of range or significantly obscured from the transmitter module.
  • the self-testing remote RF link described above may be used in a variety of applications, but a key application according to the present invention is in a remote security system. In such a system, the transmitter module is capable of transmitting an alarm signal to the receiver module over the self-testing RF communication link.
  • FIG. 5 shows the RF timing diagram (not to scale) in which an RF alarm pulse 50 is transmitted over the link during the dwell period 51 between consecutive KIT test signals 52 and 53.
  • the alarm pulse may be encoded with data and is received by the receiver module, which immediately indicates reception of the alarm signal.
  • a user may have a high degree of confidence that the link is in tact for the transmission and reception of an alarm signal, if required.
  • FIG. 6 shows one possible configuration for the internal components of the transmitter module 600.
  • the key hardware elements are the RF transmitter 601 for generating an RF signal and the aerial 602 for emitting the RF signal.
  • a modulator and code generator 603 provide the means for generating data and modulating the RF signal with it.
  • Power for the transmitter and control circuitry is derived from an internal battery 604. This will preferably be a compact rechargeable type, such as Lithium (Li) ion. In some circumstances it may be possible to operate with an RF power level below 10mW, but in practice a level of10mW (10dBm) or higher will be used to extend the range of the remote RF link according to the demands of the operational environment.
  • Li Lithium
  • an effective radiated power (ERP) of betweenlOmW and 500mW (10- 27dBm) can be achieved, giving the RF link a range of between 80 meters and 1.5 kilometers.
  • ERP radiated power
  • the capacitor will typically require a large capacitance, and therefore a supercap type capacitor is particularly suitable.
  • the charging and discharging of the capacitor is controlled via a high-value series resistor 606 and initiated by means of an internal switch 607, the keep-in-touch switch, which is controlled by the same control logic 608 that controls the modulator and code generator 603.
  • This control logic 608 will typically comprise a simple microprocessor-based timing and control system, powered directly from the battery 604.
  • a particularly efficient way of operating the RF power source is by charging the supercap 605 during the dwell time between consecutive KIT pulses, thereby ensuring the supercap is fully charged and ready for the next KIT signal.
  • An RF alarm pulse can also be controlled and generated by the same transmitter module components, although ideally separate power circuitry is required to satisfy the associated power demands.
  • the alarm could be raised via a KIT pulse, by encoding alarm data on the KIT pulse after the KIT data, although some deterioration in alarm response is then to be expected. Therefore, to ensure that power is readily available to generate a separate RF alarm pulse, it is preferred that the module comprises a separate supercap capacitor 609, series resistor 610 and internal switch (alarm switch) 611 for this purpose, as shown in Figure 6.
  • the transmission of an alarm signal will be triggered in response to some external stimulus, as monitored by either a sensor internal to the module or an external sensor in communication with the module.
  • the module shown in Figure 6 is provided with an internal detector 612.
  • a whole array of commercially available sensors may be used, depending upon the precise application of the alarm system. Examples include general motion sensors and more specialized vibration detectors, such as glass-breaking harmonic sensors, magnetic, thermal and smoke sensors, simple circuit break sensors and passive infra-red (PIR) sensors.
  • PIR passive infra-red
  • the sensor(s) will usually indicate a security violation and the alarm pulse will be transmitted.
  • the remote alarm system can thus operate independent of, and alongside, a local static alarm or control system, or else can be coupled to it.
  • the encoding of digitized data on the KIT and alarm signals permits other information to be conveyed to the receiver module, including status information and data from sensors.
  • the data may comprise a unique address associated with the transmitter module that sent it, thereby identifying which transmitter modules are in KIT communication with the receiver and precisely which transmitter module(s) has sent an alarm signal.
  • the data may further comprise an address element that is common to all transmitter modules in a particular cluster and/or is unique to a particular receiver.
  • Figure 7 shows the timing diagram for an example of pulse coding, where a 16 bit Manchester coding has been employed. Each bit is represented by a short binary pulse, with an overall repeat period of 333 ⁇ s.
  • the first 13 bits are used for addressing, permitting up to 8192 addresses, bit 14 is used for the KIT signal, bit 15 for the alarm signal and bit 16 is used as a low battery indicator.
  • Figure 8 shows one possible configuration for the internal components of the receiver module 80.
  • the key hardware components are the receiving aerial 81 and the RF receiver 82 itself. Any data present on the RF carrier signal is demodulated and decoded by a demodulator and decoder 83 and then passed to controlling electronics 84, which activate the KIT and alarm signal indicators.
  • the indicators may include visual, audible and other types, such as vibration.
  • the receiver module 80 contains its own power supply, preferably in the form of a lightweight compact rechargeable battery 85.
  • the receiver module would be the size of a key fob.
  • FIG. 9 shows a flow chart which describes the operation of the transmitter module.
  • the system depends on a sensor internal to the module (e.g. the detector 612 in Figure 6), which monitors some external stimulus.
  • a motion switch is employed that can distinguish between the situation where the vehicle in which the module is located is stationary and one where it is in motion.
  • a signal 91 is sent to a programmable integrated circuit (PIC) control unit, which switches the RF power for the KIT signal 96 to a lower level 92 of 10dBm (10mW).
  • PIC programmable integrated circuit
  • the RF power for the KIT signal 96 is switched to a higher level 95 of 25dBm (>300mW). This power level is then sufficient to ensure operation of the remote link over a large transmitter-receiver module separation (e.g. 0.8km), when the driver is no longer in the vehicle.
  • the power level is only returned to 10mW when the vehicle is moving again.
  • the time delay 94 allows for the occasions where the vehicle is stationary temporarily, for example at traffic lights or during a brief delivery stop. A delay of approximately 10 seconds might suffice for this.
  • the transmitter power is also monitored at the receiver module by a received signal strength indicator (RSSI).
  • RSSI received signal strength indicator
  • an indication of signal strength is determined 101 from the RSSI and the alarm (warning) indicator is enabled 102 or disabled 103 according to whether the RSSI level is low or high.
  • the receiver module also checks for reception of a valid alarm signal 104. If an alarm signal is received 105, and the alarm warning indicator is enabled 106, then the alarm warning is activated 107.
  • the strength of the signal received by the receiver 111 via the aerial 110 is determined by an RSSI and the level is compared by an internal voltage comparator 114 to a pre-set level 115.
  • the result 116, along with the received data signal 113 is fed to a programmable integrated circuit chip 117 that controls the receiver audible 118 and visual 119 alarm indicators.
  • the receiver alarm indicator is only enabled when a low signal strength is detected. Otherwise, when the signal strength is high, the receiver alarm indicator is disabled, corresponding to the situation where the receiver module (and vehicle driver) is in close proximity to the transmitter module (and vehicle). This situation is shown in Figure 12, where the RF signal strength is continuously monitored and when the signal strength exceeds the predetermined trigger level 120, the alarm is disabled.
  • FIG. 13 shows the architecture of one such transmitter module 130.
  • the transmitter function is actually performed by a smart transceiver 131 and power amplifier 132, which drives the aerial 133.
  • a keyboard 134 permits the entry of data and the manual activation of the device, whilst a display 135 provides for messaging and confirmation of manually entered data.
  • Processing and control is effected by a microprocessor 136, which is also coupled to internal 137 and external 138 sensors, of the type described previously.
  • the module is powered by an internal battery 139. However, the module may be configured to allow connection to external security systems and associated sensors and power supply.
  • Figure 14 gives an illustration of what the external fascia of the packaged transmitter module might look like. Dimensions of 10mm 55mm ⁇ 20mm would be typical, similar to those of a mobile phone.
  • Figure 15 shows the architecture of the corresponding receiver module 150, with the receiver function performed by a smart transceiver 151 and aerial 152.
  • a keyboard 153 permits the entry of data and the manual activation, whilst a display 154 provides for messaging and confirmation of manually entered data.
  • Processing and control is effected by a microprocessor 155, which is also coupled to internal 156 and external 57 alarm indicators, and the module has an integral battery 158 for power.
  • Figure 16 shows an example of the typical connections between microprocessor and other components within the module in more detail. The same basic arrangement will apply to both the transmitter and receiver module.
  • Figure 17 gives an illustration of what the external fascia of the packaged receiver module might look like. Dimensions could be identical to those of the transmitter module, to simplify manufacture, or else somewhat smaller.
  • the receiver module may be configured to communicate with several transmitter modules, each of which is monitoring the security of different items of property (e.g. shed, gate, car 1, car 2 and barn, as shown).
  • a further addition to the system is the provision of a docking station 159 for cooperating and communicating with a receiver module, as indicated in Figure 15.
  • An example of such a docking station 180 and its connections 181 to the receiver module are shown in Figure 18.
  • the aim of the docking station is to allow the receiver module to act as a much extended module with enhanced functionality. In this way the receiver module itself can remain small and portable, but can be connected to the docking station, for example by locating it in a matching cradle, to achieve the enhanced capability.
  • Specific features may include a battery charger 182 to recharge the internal battery of the receiver module, external sensors 183, 184 with interface 187, and indicators (siren 185, strobe light 186) with driver 188, and an auto-dialer 189 to initiate a land-line or mobile phone connection.
  • a battery charger 182 to recharge the internal battery of the receiver module
  • external sensors 183, 184 with interface 187 and indicators (siren 185, strobe light 186) with driver 188, and an auto-dialer 189 to initiate a land-line or mobile phone connection.
  • These features may be particularly useful when the receiver module in question is in communication with a large number of transmitter modules, each of which are monitoring a different object. For example, monitoring a whole vehicle lot or caravan park.
  • the docking station allows data to be collected and processed from all the sources and can send status information or alarm message to a wide range of targets, connections to a personal computer, personal digital assistant or network (e.g. the internet).
  • the docking station itself may be equipped with a display 190 and keyboard 191, allowing the entry of data and control instructions and the display of status information.
  • the present invention provides a comprehensive and integrated remote security system.
  • the heart of the system is a self-testing pulsed RF communications link between transmitter and receiver modules.
  • the use of a periodic "keep-in-touch" (KIT) signal results in minimal power drain on the internal battery, whilst a high-value supercap capacitor ensures the availability of peak power as required.
  • the KIT signal may be encoded with identification or other data.
  • the security element is achieved by the generation and transmission over the RF link of a pulsed alarm signal, in response to a stimulus detected by an internal or external sensor. On reception of an alarm signal, the receiver module activates internal or external alarm indicators.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Mechanical Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Alarm Systems (AREA)

Abstract

L'invention concerne un système de communication radiofréquence (RF) autovérificateur ayant un module émetteur qui émet un signal d'essai RF pulsé à des intervalles temporels discrets et un module récepteur qui reçoit le signal de communication RF doté d'un moyen permettant d'indiquer l'état de la liaison entre les modules émetteur et récepteur en fonction du signal d'essai RF pulsé, et de vérifier, en cours d'emploi, l'intégrité de la liaison de communication RF. L'invention concerne en outre un système de sécurité distant qui utilise le système de communication RF autovérificateur et dans lequel l'émetteur émet un signal d'alarme RF pouvant être reçu sur la liaison de communication RF par le module récepteur, ce qui déclenche une alarme. La fonction alarme peut être automatique en fonction de la proximité relative des modules émetteur et récepteur.
PCT/GB2004/003307 2003-08-01 2004-07-30 Systeme de securite radiofrequence WO2005013228A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04743628A EP1656651A1 (fr) 2003-08-01 2004-07-30 Systeme de securite radiofrequence
GB0602969A GB2420437B (en) 2003-08-01 2004-07-30 A Radio-Frequency Security System

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0318054A GB0318054D0 (en) 2003-08-01 2003-08-01 Remote alarm apparatus
GB0318054.4 2003-08-01

Publications (1)

Publication Number Publication Date
WO2005013228A1 true WO2005013228A1 (fr) 2005-02-10

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GB (2) GB0318054D0 (fr)
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1768072A1 (fr) * 2005-09-21 2007-03-28 SmTAG international AG Dispositif de surveillance
EP2083412A1 (fr) * 2008-01-25 2009-07-29 SmTAG international AG Dispositif de surveillance
WO2012131191A1 (fr) * 2011-03-31 2012-10-04 Finsecur Dispositif de declenchement d'alarme pour un systeme de securite
WO2012131189A1 (fr) * 2011-03-31 2012-10-04 Finsécur Dispositif de déclenchement d' alarme pour un systeme de sécurité et procède d'installation d'un dispositif de déclenchement d' alarme
FR2973544A1 (fr) * 2011-03-31 2012-10-05 Finsecur Dispositif de declenchement d'alarme pour un systeme de securite
CN103661261A (zh) * 2013-10-27 2014-03-26 广州市澳锝林电子有限公司 汽车智能防盗方法

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US3500405A (en) * 1969-01-23 1970-03-10 Bendix Corp Circuit for simulating transponder interrogation signals
US6362737B1 (en) * 1998-06-02 2002-03-26 Rf Code, Inc. Object Identification system with adaptive transceivers and methods of operation

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US6188715B1 (en) * 1998-04-09 2001-02-13 Andrzej Partyka Frequency hopping system for intermittent transmission with receiver using individual tracking, FFT, and authentication

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US3500405A (en) * 1969-01-23 1970-03-10 Bendix Corp Circuit for simulating transponder interrogation signals
US6362737B1 (en) * 1998-06-02 2002-03-26 Rf Code, Inc. Object Identification system with adaptive transceivers and methods of operation

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1768072A1 (fr) * 2005-09-21 2007-03-28 SmTAG international AG Dispositif de surveillance
EP2083412A1 (fr) * 2008-01-25 2009-07-29 SmTAG international AG Dispositif de surveillance
WO2012131191A1 (fr) * 2011-03-31 2012-10-04 Finsecur Dispositif de declenchement d'alarme pour un systeme de securite
WO2012131189A1 (fr) * 2011-03-31 2012-10-04 Finsécur Dispositif de déclenchement d' alarme pour un systeme de sécurité et procède d'installation d'un dispositif de déclenchement d' alarme
FR2973544A1 (fr) * 2011-03-31 2012-10-05 Finsecur Dispositif de declenchement d'alarme pour un systeme de securite
FR2973545A1 (fr) * 2011-03-31 2012-10-05 Finsecur Dispositif de declenchement d'alarme pour un systeme de securite et procede d'installation d'un dispositif de declenchement d'alarme
FR2973546A1 (fr) * 2011-03-31 2012-10-05 Finsecur Dispositif de declenchement d'alarme pour un systeme de securite
WO2012131190A3 (fr) * 2011-03-31 2012-12-20 Finsécur Dispositif de declenchement d'alarme pour un systeme de securite
US9466206B2 (en) 2011-03-31 2016-10-11 Finsecur Alarm triggering device for a security system and method for installing an alarm triggering device
US9467358B2 (en) 2011-03-31 2016-10-11 Finsecur Alarm triggering device for a security system
CN103661261A (zh) * 2013-10-27 2014-03-26 广州市澳锝林电子有限公司 汽车智能防盗方法

Also Published As

Publication number Publication date
GB2420437B (en) 2007-07-25
EP1656651A1 (fr) 2006-05-17
GB0602969D0 (en) 2006-03-29
GB0318054D0 (en) 2003-09-03
GB2420437A (en) 2006-05-24

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