Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01Q—ANTENNAS, i.e. RADIO AERIALS
  • H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
  • H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
  • H01Q13/203—Leaky coaxial lines
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
  • H04K3/00—Jamming of communication; Counter-measures
  • H04K3/40—Jamming having variable characteristics
  • H04K3/43—Jamming having variable characteristics characterized by the control of the jamming power, signal-to-noise ratio or geographic coverage area
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
  • H04K3/00—Jamming of communication; Counter-measures
  • H04K3/40—Jamming having variable characteristics
  • H04K3/45—Jamming having variable characteristics characterized by including monitoring of the target or target signal, e.g. in reactive jammers or follower jammers for example by means of an alternation of jamming phases and monitoring phases, called "look-through mode"
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
  • H04K2203/00—Jamming of communication; Countermeasures
  • H04K2203/10—Jamming or countermeasure used for a particular application
  • H04K2203/16—Jamming or countermeasure used for a particular application for telephony
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
  • H04K2203/00—Jamming of communication; Countermeasures
  • H04K2203/30—Jamming or countermeasure characterized by the infrastructure components
  • H04K2203/32—Jamming or countermeasure characterized by the infrastructure components including a particular configuration of antennas
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
  • H04K2203/00—Jamming of communication; Countermeasures
  • H04K2203/30—Jamming or countermeasure characterized by the infrastructure components
  • H04K2203/34—Jamming or countermeasure characterized by the infrastructure components involving multiple cooperating jammers

Definitions

• the invention relates to a method and a scrambling device using an overhead line and a scrambling device, the assembly being adapted to generate and broadcast disturbing or jamming signals in a given closed or semi-open space without impact on the operation. elements arranged outside this space.
• radio communication devices such as mobile phones
• One of the problems today is to eradicate all unauthorized radiocommunications in a closed enclosure by controlling the containment of the signal used to prevent such communications by avoiding any inconvenience to outside users not concerned by this prohibition of radiocommunications.
• US Patent 6,195,529 discloses a method and device for blocking the transmission of mobile phones by transmitting interfering signals in the frequency range of the mobile radio.
• Patent application WO 98 56192 describes a method for regulating cellular communications.
• the object of the invention is based in particular on the use of one or more linear geometry airplanes associated with effectors consisting of suitable scrambling devices and couplings.
• effectors consisting of suitable scrambling devices and couplings.
• the use of these effectors and the linear geometry of the aerial allow both:
• the invention relates to a confined interference device disposed in a coverage area in which there may be prohibited radio communication devices whose operation is sought to prevent, characterized in that it comprises at least the following elements:
• At least one linear aerial comprising several orifices Oi allowing the radiation of interference signals, the linear aerial being connected to one or more effectors via a connector,
• the one or more effectors being adapted to inject one or more interference signals at one end of at least one of the linear overhead signals, the power flow ⁇ of the interference signal J jif in the band ⁇ of a carrier f is chosen such that the ratio Ps, j / Pj, f, between the power flow Ps j of the signal S j , f potentially usable by the forbidden device on the carrier f and the power flow Pj , f , of the signal J f present on the carrier f to prevent the prohibited device from operating is below the operating threshold Thresholds j .t of the forbidden device (Psj / Pj, f ⁇ Thresholds.t).
• the effector is adapted to generate, for a point M (r, l) in which a forbidden radiocommunication device is located, a value of the spectral density ⁇ ( ⁇ , ⁇ ) of the interference signal injected into the linear overhead via the connector such as for the band B ,, f of each carrier f on
• . r, I are the coordinates of a point M
• I 0 denotes a reference linear distance
• r 0 denotes a reference radial distance to the linear element
• ⁇ represents a margin of caution taking into account additional attenuations of the jamming signal during its propagation from the air to the forbidden terminal.
• the effector is, for example, adapted to generate transmission power taking into account one or more of the following elements:
• margins ⁇ intended to compensate for the additional attenuations of various types which may affect the jamming signal J during its propagation from the linear overhead line to the device to be scrambled.
• the characteristics of the prohibited radiocommunication devices and the characteristics of the aerial radiation regime are previously known or measured in order to parameterize and adjust the frequency bands of the interference signal, the nature of the jamming signals emitted and the levels at the output of the effector whose signal is injected into the air via the coupler.
• At least one of the effectors is, for example, adapted to the generation and transmission of scrambling signals, and is a broadband generic scrambler.
• the effector is, for example, adapted to the generation and emission of jamming signals and is composed of a set of dedicated jammers, whose output signals are transmitted to filtering and amplification and rectification modules, then injected into a coupler, the output of said coupler being injected into the linear aerial.
• the effector is, for example, adapted to the generation and transmission of jamming signals and comprises modules frequency-selective filtering apparatus adapted to excise the scrambling signal to release one or more carriers usable by a controlled radiocommunication over-network.
• the device may comprise means adapted to duplex the signal at the output of an effector and a device for injecting said signal into two different linear aerials.
• the device may also comprise a first effector disposed at a first end of the linear overhead and a second effector disposed at a second end of the linear overhead line in order to inject a jamming signal J1, J2 at each end of the linear air.
• the device may include a system of baffles adapted to locally optimize the confinement, baffles for which one can use grilles for passage of electric cables with inverted mounting, mesh meshes and various geometries.
• the invention also relates to a method of interference jamming the operation of one or more radiocommunication devices prohibited in a given zone, implemented in the device having one of the preceding characteristics, the method is characterized in that it has at least the following steps:
• At least one linear aerial comprising a plurality of orifices Oi allowing the radiation of jamming signals, the linear aerial being connected to one or more effectors via a connector,
• the power flow ⁇ of the jamming signal J j, f in the band B jf of a carrier f is chosen such that the ratio
• a value of the spectral density N jf (r, l) is generated for the interference signal injected into the overhead line, such as for the band B if of each carrier f
• . r, I are the coordinates of a point M
• I 0 denotes a reference linear distance
• . r 0 denotes a reference radial distance to the linear element
• ⁇ represents a margin of caution taking into account additional attenuations of the jamming signal during its propagation from the air to the forbidden terminal.
• FIG. 1 an exemplary device according to the invention comprising a linear element at the input of which a scrambling device injects a scrambling signal dedicated to the eradication of unauthorized radiocommunications,
• FIG. 2 a linear element detail
• FIG. 3a an example of an arrangement of a linear element provided at each of its ends with an effector and implemented in a space with a privileged direction
• FIG. 3b a possible example of an arrangement of several linear elements for the implementation of the method in a closed space of rectangular or square shape whose linear elements define the perimeter, in which the jamming signal, emanating from two effectors present at the ends of a diagonal, is distributed in each half-perimeter,
• Figure 4 a representation of a linear element with an effector connected to each end.
• FIG. 1 schematizes a first exemplary embodiment of the device according to the invention comprising an overhead with linear geometry 1, associated with a device for generating disturbing waves or effector 2, via a connector 3.
• the mobile telephone 4 which is not Not allowed to receive communications or data is found on this figure in the vicinity and in the efficiency zone of the linear overhead.
• the effector 2 is for example composed of:
• filtering modules and amplification and rectifying stages 6, 6 ' signals emitted by the aforementioned generation and transmission devices, these filtering and amplification modules making it possible to finely adjust the bands, the carriers and the output levels,
• Such an arrangement makes it possible to produce a broadband interference signal or a multi-band interference signal, of frequency bands, carriers and adequate levels in given areas where mobile phones 4 that are sought to prevent operation can be found.
• the scrambling signal is injected into the linear overhead via the connector 3 with a level adjusted on each band and on each carrier in these bands to scramble and prevent on these carriers all data exchange between the mobile terminal and prohibited communications networks throughout the area covered by linear overhead. That is to say that in the example of FIG.
• the resulting jamming signal J considered at the forbidden terminal, has, for each of the carriers potentially usable by the forbidden terminal, a power Pj defined as a function of the power P s of the signals listened to by the forbidden terminal, such that the PS / PJ ratio is less than the operating threshold Thresholds of the prohibited mobile phone on each usable carrier (this operating threshold Thresholds being known to those skilled in the art for each radio network to be forbidden by consultation of the standards of these networks).
• the aerial linear geometry 1 has for example radiation characteristics which, combined with suitable effectors as described above, can disrupt the operation of mobile phone present at the point M (r, l) by precisely controlling the flow the radiated power Pj (r, l) as a function of the linear distance I and the radial distance r which define the positions M (, l) of one or more illicit devices (ie the positions of the mobile telephones 4 in the area covered by linear overhead).
• the linear distance I is defined, for example, with respect to the connector 3 of the linear element.
• the radial distance r is determined by the measurement of the perpendicular to the linear element which meets the point M (r, l), for example.
• I denotes the linear distance
• I 0 denoting a reference linear distance (in general the man of the art considers l 0 as zero or very weak and corresponds to 0 for example the output of the coupler 7) and P 0 (lo) designating the corresponding power in the band Bj resulting from the injection of the jamming signal into the aerial via the connector 3,
• P 'de notes the rate of linear losses along the aerial radiating from the reference linear distance l 0 (assumed loss, to simplify rewrite but without limitation of generality, constant in the band Bj, itself supposed to be sufficiently narrow ); this value is a manufacturer datum in general or a quantity paired by the measurement in each of the bands Bj, this value is at most a few dB per 100 m of propagation in the air,
• Pj (1, r) is the power flow in the band Bj of the signal J at the point M (r, l).
• the power Pj considered is global and can correspond to several sub-bands (in this case what counts for the interference efficiency is Ps / PJ ⁇ Thresholds in the previously noted band Bj of the carrier of S).
• the rate of linear losses P 'by propagation in the air is low, which guarantees a uniform level of aerial radiation over the lengths targeted by the invention, the linear distance typically satisfying the [l 0 , L];
• the dimensions of the linear air element, its diameter ⁇ , its length L and its orientation with respect to the geometry of the zone to be covered, as well as the distribution of the orifices Oi allowing the diffusion of the interference signals J and the positioning of possible baffles to facilitate the confinement are chosen in particular according to the radiocommunication devices whose operation it is desired to eradicate, and the geometry of the zone in which it is desired to eradicate the operation of illicit radiocommunications.
• the orientation of the linear elements is performed for example tangentially to these privileged directions.
• the aerials are arranged for example tangentially to the edges of this enclosure.
• the emission powers of the effector 2 are adjusted, for example taking into account one or more of the following elements:
• the power flow ⁇ of the jamming signal J jif in the band B jf of the carrier f is such that the signal S j, f potentially usable by the forbidden terminal (index i) on the carrier f, power flow Ps, i, f, is received with a ratio Ps, i / Pj, f lower than the operating threshold Thresholdj.t of the forbidden portable terminal (this threshold operating threshold Sj , f being known to those skilled in the art for each radio network and for each type of carrier beacons f to prohibit, by consulting the standards of these networks).
• the ratio Psj, f / Pj, f, between the power flow Ps .t of the signal Sj, f potentially usable by the forbidden device on the carrier f and the power flow Pj , f , of the signal J f present on the carrier f to prevent the forbidden device from operating is less than the operating threshold Thresholds of the forbidden device (Ps, j, f / Pj, t ⁇ Thresholds.t) - This is written in decibels:
• the spectral density N j , f (r, l) of the interference signal injected into the linear overhead via the connector 3 must therefore verify for the band B ,, f of each carrier f:
• FIG. 1 shows radio communication signals S 8 , S 9 , S-10, Su coming from external transmitters 8, 9, 1 0, 1 1 in bands B 8 , B 9 , B 0 , Bu , the transmitters being likely to enter into communication with the illicit terminal 4 of which it is desired to eradicate radiocommunications.
• a beacon carrier or external transmitter control at carrier frequencies respectively denoted f 8 , f 9 , fm, fn, and bands respectively denoted Bj !
• Thresholds.io Thresholds.n operating points (known to those skilled in the art) of the illicit terminal 4 in the bands B J 8 , Bj , 9 , Bj 0 , Bj , ii of the carriers f 8 , f 9 , f 0 , fn, the signal levels minimum interference Pj, 8 Pj, 9 PJ O Pj, n which must be received by the illegal terminal 4 in the bands Bj, 8 , Bj, 9 , Bj, -
• 0 , Bj, n satisfy the following conditions
• the effector device 2 for generating and transmitting the jamming signals is composed, for example, of a generic broadband jammer or of a set of jammers each dedicated to one of the radio communication networks prohibited in the zone. covered, amplitude-adjusted where appropriate, and whose outputs are coupled according to methods well known to those skilled in the art before injection into the linear air so as to treat several bands B j and multiple carriers f j simultaneously. Its characteristics are, for example, chosen according to the illicit devices likely to be in a supervised area. This allows somehow to build an effector "à la carte" specifically adapted to the processed radio configuration and to networks whose communications must be locally neutralized.
• radio-cellular jammers For example, it is possible to use dedicated second, third and fourth generation radio-cellular jammers, GPS (Global Positioning System) jammers operating the industrial ISM band (Industrial, Scientific and Medical). ) (Bluetooth short radio type, or following WiFi wireless protocol), etc. (see Figure 1, 5 and 5 '). These dedicated jammers have low power per subband ( ⁇ 1 W), low cost (odg ⁇ 100 $ unit x a few units per device).
• frequency excision a method known to those skilled in the art, of one or more carriers in the scrambling signal by a filtering adapted at the level of the amplification and rectification stages (6, 6 '), so as to allow the use of these carriers for radio controlled by the system operator, emergency calls, authorized on-network radiocommunications, etc.
• the method according to the invention associated with the example of FIG. 1 comprises, for example, the following steps:
• Figure 2 is a detail of an example of a linear cable comprising a plurality of orifices arranged to allow the passage of interference waves in the area to be monitored.
• the linear air comprises several orifices Oi distributed along the element according to the desired application, the orifices are separated by sections 21 which do not allow the passage of jamming signals.
• FIG. 3a schematizes an alternative embodiment of the invention in a corridor-type preferred direction enclosure in which a single element 301 has been installed at a ceiling and two effectors 305 306 at the opposite ends of the ceiling. element, as described above.
• the orifices of the linear element allow the emission of interference signals Ji, J 2 , the mobile phone 4 located in the corridor can not decode the signals emitted by exteriors.
• the parameters of interference, power levels, will be selected in particular according to the linear arrangement of these linear elements.
• FIG. 3b schematizes an alternative embodiment of the invention in an enclosure having no privileged direction, in which four linear elements 31 1, 312, 313, 314, of length L 2 , Li, L 2 , respectively, have been installed.
• L at the unrepresented walls of a piece of square geometry to monitor and two effectors 315, 31 6 at opposite ends of one of the diagonals of the room, as described above.
• the effector 315 is connected according to an arrangement described in FIG. at the two linear elements 31 1, 312, the effector 31 6 is connected with the linear elements 313, 314.
• the orifices of the four linear elements allow the emission of interference signals Ji, J 2 , J 3 , J 4 , the mobile phone 4 located in the room can decode the signals emitted by outsiders.
• the scrambling parameters, the power level, will be selected in particular according to the square arrangement of these linear elements.
• FIG. 4 represents another embodiment, it will be possible to connect a first effector 42a at a first end 41a of the linear aerial 41 via a first connector 43a and a second effector 42b at the second end 41b of the linear overhead 41 via a second connector 43b in order to inject a jamming signal Ji, J 2 , at each end of the linear overhead 41.
• the first and second effector have substantially identical characteristics (same emission levels, same frequency bands), but their signals are decorrelated according to a technique known to those skilled in the art in order to avoid the phenomena of interference and standing waves during their propagation in linear overhead.
• baffles for the passage of electric cables (frequencies> 900 MHz) with inverted mounting, meshes and various geometries.
• Another variant is to add a metrology in phase installation / maintenance which facilitates the installation and adjustment of the device.
• a metrology in phase installation / maintenance which facilitates the installation and adjustment of the device.
• Examples of components usable on the carriers released for such an on-network are wireless access points DECT (Digital Enhanced Cordless Telephone), pico / femto-cells of the third generation system UMTS (Universal Mobile Telecommunications System) or of the LTE (Long Term Evolution) standard, Wi-Fi or WiFi Direct points, UMTS "device-to-device” terminals or LTE manet (Release 12) terminals known to those skilled in the art, etc.
• the device and the method according to the invention notably have the following advantages:

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• Engineering & Computer Science (AREA)
• Computer Networks & Wireless Communication (AREA)
• Signal Processing (AREA)
• Mobile Radio Communication Systems (AREA)
• Near-Field Transmission Systems (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=50624629

Family Applications (1)

Country Status (8)

Family Cites Families (2)

• 2013
  • 2013-12-11 FR FR1302900A patent/FR3014618B1/fr not_active Expired - Fee Related
• 2014
  • 2014-12-10 WO PCT/EP2014/077249 patent/WO2015086690A1/fr active Application Filing
  • 2014-12-10 PT PT148161797T patent/PT3080869T/pt unknown
  • 2014-12-10 EP EP14816179.7A patent/EP3080869B1/de active Active
  • 2014-12-10 CA CA2933410A patent/CA2933410A1/en not_active Abandoned
  • 2014-12-10 MX MX2016007610A patent/MX367816B/es active IP Right Grant
  • 2014-12-10 SG SG11201604796PA patent/SG11201604796PA/en unknown
  • 2014-12-10 ES ES14816179.7T patent/ES2681276T3/es active Active

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