EP3080869B1 - Jamming method and device with confined linear effect - Google Patents

Description

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.

It finds its application to disrupt or prevent the operation of radio systems, radiocommunication devices, the use of which is illegal, or radio systems that do not have operating authorization, in enclosures, prisons, cinemas examination, etc.

In certain environments such as prisons, examination centers, schools, some rooms in embassies, experimental centers, etc., the use of radio communication devices, such as mobile phones, is prohibited. 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.

The state of the art known to the applicant describes detection systems and jamming systems that will block the illicit radio communications and the systems that use them from conventional radio antennas. These devices have many disadvantages; due to geometrical losses 20.log ₁₀ (R) of the radiated power from a conventional antenna (R being the distance from the antenna phase center), they are poorly suitable in terms of efficiency, coverage, power emitted; the containment is not satisfactory, which generates complaints from operators and external users not affected by this prohibition; they are very delicate to install and maintain, and often expensive as soon as significant hedges have to be obtained.

The patent US 6,195,529 discloses a method and a device for blocking the transmission of mobile phones by transmitting interfering signals in the frequency range of the mobile radio.

The document entitled Jamming System for Mobile Communications by POUSADA-CARBALLO et al., Electronics Letters, IEE STEVENAGE, vol. 34, no. 22, XP00601536 , describes a scrambling system for communications in a closed area, generating noise signals at the transmission channel corresponding to the signal to be scrambled.

The patent application WO 98 56192 discloses a method for regulating cellular communications.

There is at present a need for a device allowing complete jamming of radio communications considered to be illegal, which device applies within a given closed space in general (or known as "space"). indoor "), whose effectiveness is reliable, controlled coverage, confined effect, and controlled containment. The term "unlawful or prohibited terminal" means a terminal, a radiocommunication device that is not authorized to operate in a given area and outside that perimeter.

We shall use indifferently the expression "linear element" or "linear air" to designate the same element.

• d'assurer une couverture fiable du brouillage,
• de contrôler le confinement du brouillage,
• d'émettre simultanément de nombreux signaux de brouillage adressant simultanément un grand nombre d'intervalles en fréquence et un grand nombre de systèmes de radiocommunication dont les plans de fréquence sont inclus dans ces intervalles.

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. The use of these effectors and the linear geometry of the aerial allow both:

• to ensure reliable coverage of the interference,
• to control the confinement of the interference,
• transmit simultaneously many jamming signals simultaneously addressing a large number of frequency intervals and a large number of radio systems whose frequency plans are included in these ranges.

• au moins un câble linéique comprenant plusieurs orifices Oi permettant le rayonnement de signaux de brouillage, le câble linéique étant relié à un ou plusieurs effecteurs via un connecteur,
• le ou lesdits éléments effecteurs, étant adaptés à injecter à une extrémité au moins du câble linéique un ou plusieurs signaux de brouillage, le flux de puissance P_j,f du signal de brouillage J_j,f dans la bande B_j,f d'une porteuse f est choisi tel que le rapport P_S,j,f/P_J,f, entre le flux de puissance P_S,j,f du signal S_j,f potentiellement utilisable par le dispositif interdit sur la porteuse f et le flux de puissance P_J,f, du signal J_f présent sur la porteuse f pour empêcher le dispositif interdit de fonctionner est inférieur au seuil de fonctionnement Seuil_S,j,f du dispositif interdit (P_S,j/P_J,f ≤ Seuil_S,j,f).

The invention is defined by the characteristics of the independent claims 1 and 10. 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 includes at least the following elements:

• at least one linear cable comprising a plurality of orifices Oi allowing the radiation of jamming signals, the linear cable being connected to one or more effectors via a connector,
• the one or more effectors being adapted to inject at least one of the linear cable one or more interference signals, the power flow P _{j, f} of the interference signal J _{j, f} in the band B _{j, f} of a carrier f is chosen such that the ratio P _{S, j, f} / P _{J, f} , between the power flow P _{S, j, f} of the signal S _{j, f} potentially usable by the forbidden device on the carrier f and the power flow P _{J, f} , of the signal J _f present on the carrier f to prevent the forbidden device from operating is below the operating threshold Threshold _{S, j, f} of the forbidden device (P _{S, j /} P _{J, f} ≤ Threshold _{S, j, f} ).

où

• • r, l, sont les coordonnées d'un point M,
• • l₀ désigne une distance linéique de référence, r₀ désigne une distance radiale de référence à l'élément linéique,
• • P' désigne le taux des pertes linéiques le long du câble rayonnant à partir de la distance l₀,
• • -C(r₀) désigne les pertes par couplage dans la bande B_J à la distance radiale de référence r₀,
• • η représente une marge de précaution tenant compte des atténuations supplémentaires du signal de brouillage lors de sa propagation du câble linéique au terminal interdit.

According to an alternative embodiment, 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 N _{j, f} (r, l) of the signal of interference injected into the linear cable via the connector such as for the band B _{i, f} of each carrier f on $$10.{\mathrm{<figure-callout\; id="10"\; label="log"\; filenames="imgf0001.png"\; state="\{\{state\}\}">log</figure-callout>}}_{10}\left({\mathrm{NOT}}_{\mathrm{j},\mathrm{f}}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{B}}_{\mathrm{i},\mathrm{f}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)-10.{\mathrm{<figure-callout\; id="10"\; label="log"\; filenames="imgf0001.png"\; state="\{\{state\}\}">log</figure-callout>}}_{10}\left({\mathrm{Threshold}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)+\mathrm{<figure-callout\; id="0"\; label="VS\; r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">VS\; </figure-callout>}\left({\mathrm{r}}_{}\right)\left({\mathrm{}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{<figure-callout\; id="0"\; label="l"\; filenames="imgf0001.png"\; state="\{\{state\}\}">l</figure-callout>}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">r</figure-callout>}}_0\right)+\mathrm{\eta }$$

or

• • r, l, are the coordinates of a point M,
• • l ₀ denotes a reference linear distance, r ₀ denotes a reference radial distance to the linear element,
• • P 'denotes the rate of linear losses along the cable radiating from the distance l ₀ ,
• -C (r ₀ ) denotes the coupling losses in the band B _J at the reference radial distance r ₀ ,
• • η represents a margin of caution taking into account additional attenuations of the interference signal during its propagation of the linear cable to the forbidden terminal.

• les mesures des niveaux des signaux de balise, de contrôle et de trafic provenant d'émetteurs présents dans les réseaux externes et susceptibles d'entrer en communication avec les dispositifs illicites,
• le taux P' de pertes linéiques dans le câble linéique,
• les pertes par couplages -C(r₀) du câble linéique,
• des marges η destinées à compenser les atténuations supplémentaires de nature diverses qui peuvent affecter le signal de brouillage J lors de sa propagation depuis le câble linéique jusqu'au dispositif à brouiller.

The effector is, for example, adapted to generate transmission power taking into account one or more of the following elements:

• measurements of the beacon, control and traffic signal levels from transmitters in the external networks likely to communicate with the illicit devices,
• the rate P 'of linear losses in the linear cable,
• losses by coupling -C (r ₀ ) of the linear cable,
• margins η for compensating for additional attenuations of various kinds which may affect the interference signal J during its propagation from the linear cable to the device to be scrambled.

According to one variant, the characteristics of the forbidden radiocommunication devices and the characteristics of the radiation regime of the linear cable are previously known or measured in order to parameterize and adjust the frequency bands of the interference signal, the nature of the emitted interference signals and the levels of interference. output of the effector whose signal is injected into the linear cable 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 cable.

According to one variant, 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 cables.

The device may also include a first effector disposed at a first end of the linear cable and a second effector disposed at a second end of the linear cable for injecting a jamming signal J1, J2 at each end of the linear cable.

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.

• utiliser au moins un câble linéique comprenant plusieurs orifices Oi permettant le rayonnement de signaux de brouillage, le câble linéique étant relié à un ou plusieurs effecteurs via un connecteur,
• injecter à une extrémité au moins du câble linéique un ou plusieurs signaux de brouillage, le flux de puissance P_j,f du signal de brouillage J_j,f dans la bande B_j,f d'une porteuse f est choisi tel que le rapport P_S,j,f/P_J,f, entre le flux de puissance P_S,j,f du signal S_j,f potentiellement utilisable par le dispositif interdit sur la porteuse f et le flux de puissance P_J,f, du signal J_f présent sur la porteuse f pour empêcher le dispositif interdit de fonctionner soit inférieur au seuil de fonctionnement Seuil_S,j,f du dispositif interdit (P_S,j/P_J,f ≤ Seuil_S,j,f).

The invention also relates to a method of 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:

• using at least one linear cable comprising a plurality of orifices Oi allowing the radiation of jamming signals, the linear cable being connected to one or more effectors via a connector,
• injecting at least one end of the linear cable one or more jamming signals, the power flow P _{j, f} of the interference signal J _{j, f} in the band B _{j, f} of a carrier f is chosen such that the ratio P _{S, j, f} / P _{J, f} , between the power flow P _{S, j, f} of the signal S _{j, f} potentially usable by the forbidden device on the carrier f and the power flow P _{J, f} , of signal J _f present on the carrier f to prevent the forbidden device from operating is below the operating threshold Threshold _{S, j, f} of the prohibited device (P _{S, J /} P _{J, f} ≤ Threshold _{S, j, f} ).

où

• • r, l, sont les coordonnées d'un point M,
• • l₀ désigne une distance linéique de référence,
• • r₀ désigne une distance radiale de référence au câble linéique,
• P' désigne le taux des pertes linéiques le long du câble rayonnant à partir de la distance l₀,
• • -C(r₀) désigne les pertes par couplage dans la bande B_J à la distance radiale de référence r₀,
• • η représente une marge de précaution tenant compte des atténuations supplémentaires du signal de brouillage lors de sa propagation du câble au terminal interdit.

For carrying out the method, a value of the spectral density N _{j, f} (r, l) is generated for the interference signal injected into the linear cable such as for the band B _{i, f} of each carrier f $$10.{\log }_{10}\left({\mathrm{NOT}}_{\mathrm{j},\mathrm{f}}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{B}}_{\mathrm{i},\mathrm{f}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)-10.{\log }_{10}\left({\mathrm{Threshold}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)+\mathrm{<figure-callout\; id="0"\; label="VS\; r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">VS\; </figure-callout>}\left({\mathrm{r}}_{}\right)\left({\mathrm{}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{<figure-callout\; id="0"\; label="l"\; filenames="imgf0001.png"\; state="\{\{state\}\}">l</figure-callout>}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">r</figure-callout>}}_0\right)+\mathrm{\eta }$$

or

• • r, l, are the coordinates of a point M,
• • l ₀ denotes a reference linear distance,
• R ₀ denotes a reference radial distance to the linear cable,
• P 'denotes the rate of linear losses along the cable radiating from the distance l ₀ ,
• -C (r ₀ ) denotes the coupling losses in the band B _J at the reference radial distance r ₀ ,
• • η represents a margin of caution taking into account the additional attenuation of the interference signal during its propagation of the cable to the forbidden terminal.

• la figure 1, un exemple de dispositif selon l'invention comprenant un élément linéique en entrée duquel un dispositif de brouillage injecte un signal de brouillage dédié à l'éradication des radiocommunications non autorisées,
• la figure 2, un détail d'élément linéique,
• la figure 3a, un exemple d'agencement d'un élément linéique pourvu à chacune de ses extrémités d'un effecteur et mis en oeuvre dans un espace avec une direction privilégiée,
• la figure 3b, un exemple possible d'agencement de plusieurs éléments linéiques pour la mise en oeuvre du procédé dans un espace fermé de forme rectangulaire ou carrée dont les éléments linéiques définissent le périmètre, dans lequel le signal de brouillage, émanant de deux effecteurs présents aux extrémités d'une diagonale, est distribué dans chaque demi-périmètre,
• la figure 4, une représentation d'un élément linéique avec un effecteur connecté à chaque extrémité.

Other characteristics and advantages of the method and of the device according to the invention will appear better on reading the following description of an exemplary embodiment given by way of illustration and in no way limiting attached to the figures which represent:

• the figure 1 an example of a 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,
• the figure 2 , a linear element detail,
• the figure 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,
• the figure 3b , a possible example of 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,
• the figure 4 , a representation of a linear element with an effector connected to each end.

In order to better understand the object of the invention, the description is given for illustrative and not limiting purposes for an application to prevent the operation (transmission / reception) of a mobile phone whose use is prohibited within 'a prison, that is to say that we will ensure that the signaling signals to this mobile phone can not be decoded or interpreted by the latter, which makes it impossible for any access to the network any request for a call or any answer to the calls. This example can be extended to all radio devices whose operation is not allowed in a given space.

The figure 1 schematically a first embodiment of the device according to the invention comprising an aerial linear geometry 1, associated with a device for generating disturbing waves or effector 2, via a connector 3. The mobile phone 4 which is not authorized to receive communications or data is found on this figure in the vicinity and in the efficiency zone of the linear overhead.

• un ou plusieurs dispositifs de génération et d'émission de signaux de brouillages 5, 5',
• un ou plusieurs modules de filtrages et des étages d'amplification et redressement 6, 6', des signaux émis par les dispositifs de génération et d'émission précités, ces modules de filtrages et amplification permettant de régler finement les bandes, les porteuses et les niveaux en sortie,
• d'un coupleur 7 permettant de constituer le signal effectivement injecté dans l'aérien linéique 1 via le connecteur 3.

The effector 2 is for example composed of:

• one or more devices for generating and transmitting interference signals 5, 5 ',
• one or more filtering modules and amplification and rectification stages 6, 6 ', signals emitted by the above-mentioned generation and transmission devices, these filtering and amplification modules making it possible to finely adjust the bands, the carriers and the output levels,
• a coupler 7 making it possible to constitute the signal effectively injected into the linear aerial 1 via the connector 3.

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. In practice, 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, in the example of the figure 1 the resulting jamming signal J, considered at the forbidden terminal has, for each of the carriers potentially usable by the forbidden terminal, a power P _J defined as a function of the power P _S of the signals listened to by the forbidden terminal, in such a way that the P _S / P _J ratio is less than the operating threshold Threshold threshold _S of the mobile phone prohibited on each usable carrier (this operating threshold Threshold _S being known to those skilled in the art for each radiocommunication network to be prohibited by consultation 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 P _J (r, l) as a function of the linear distance l 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 l 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.

• • l désignant la distance linéique,
• • r désignant la distance radiale à l'élément linéique,
• • l₀ désignant une distance linéique de référence (en général l'homme de l'art considère l₀ comme nul ou très faible et fait correspondre l₀ par exemple à la sortie du coupleur 7) et P₀(l₀) désignant la puissance correspondante dans la bande B_J résultant de l'injection du signal de brouillage dans l'aérien via le connecteur 3,
• • P' désignant le taux des pertes linéiques le long de l'aérien rayonnant à partir de la distance linéique de référence l₀ (perte supposée, pour simplifier l'écriture mais sans limitation de généralité, constante dans la bande B_J, elle-même supposée suffisamment étroite); cette valeur est une donnée constructeur en général ou une grandeur appairée par la mesure dans chacune des bandes B_J, cette valeur est d'au plus quelques dB par 100 m de propagation dans l'aérien,
• • r₀ désignant une distance radiale de référence à l'élément linéique (en général l'homme de l'art considère r₀ = 2 m),
• • -C(r₀) désignant les pertes par couplage dans la bande B_J à la distance radiale de référence r₀ ; (-C(r₀), donnée constructeur en général, ou appairée par mesure, présente une valeur de l'ordre de -55 dB à -70 dB à distance radiale de référence r₀= 2m, homogène sur la longueur de l'aérien),
• • P_J(l,r) est le flux de puissance dans la bande B_J du signal J au point M(r,l). Dans le cas où l'on a plusieurs signaux de brouillage, la puissance P_J considérée est globale et peut correspondre à plusieurs sous bandes (dans ce cas ce qui compte pour l'efficacité du brouillage est P_S / P_J < Seuil_s dans la bande précédemment notée B_J de la porteuse de S).

More precisely, the radiated interference power flow P _J (l, r) by the aerial in a scrambled band B _J at the point M (r, l) indicated by the linear distance l and the radial distance r, is given by decibel (dB) by the "cylindrical" radiation regime expressed by the following formula: $$10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{J}}\left(\mathrm{l},\mathrm{r}\right)\right)=10.{\log }_{10}\left({\mathrm{P}}_0\left({\mathrm{l}}_0\right)\right)-\mathrm{VS}\left({\mathrm{r}}_0\right)-\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{l}}_0\right)-10.{\log }_{10}\left(\mathrm{r}/{\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">r</figure-callout>}}_0\right)$$

• Where l denotes the linear distance,
• Where r denotes the radial distance to the linear element,
• 1 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 (l ₀ ) designating the corresponding power in the band B _J resulting from the injection of the interference signal into the aerial via the connector 3,
• • P 'denoting the rate of linear losses along the aerial radiating from the reference linear distance l ₀ (assumed loss, to simplify the writing but without limitation of generality, constant in the band B _J , itself even 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 B _J , this value is at most a few dB per 100 m of propagation in the air,
• Where r ₀ denotes a reference radial distance to the linear element (generally those skilled in the art consider r ₀ = 2 m),
• • -C (r ₀ ) designating the losses by coupling in the band B _J at the reference radial distance r ₀ ; (-C (r ₀ ), constructor data in general, or paired by measurement, has a value of the order of -55 dB at -70 dB at radial distance of reference r ₀ = 2m, homogeneous over the length of the air),
• • P _J (l, r) is the power flow in the band B _J of the signal J at the point M (r, l). In the case where there are several interference signals, the power P _J considered is global and can correspond to several sub-bands (in this case what counts for the interference efficiency is P _S / P _J <Threshold _s in the previously noted band B _J of the carrier of S).

• le taux des pertes linéiques P' par propagation dans l'aérien est faible, ce qui garantit un niveau de radiation de l'aérien homogène sur les longueurs visées par l'invention, la distance linéique vérifiant typiquement l∈[l₀,L] ; L ≤ 100 m,
• le régime cylindrique (exprimé en dB par -10.log₁₀(r/r0) dans la formulation(1)) des pertes de propagation par rayonnement dépend linéairement de l'inverse de la distance radiale r à l'aérien linéique et non pas quadratiquement de l'inverse de la distance R (distance réelle/centre de phase) absolue au centre de phase de l'aérien comme dans le cas des systèmes classiques décrits dans l'état de l'art.

In the wording (1) above:

• the rate of linear losses P 'by propagation in the air is low, which guarantees a level of radiation of the aerial homogeneous on the lengths covered by the invention, the linear distance typically satisfying l∈ [l ₀ , L] ; L ≤ 100 m,
• the cylindrical regime (expressed in dB by -10.log ₁₀ (r / r0) in the formulation (1)) of radiation propagation losses depends linearly on the inverse of the radial distance r at the linear overhead and not quadratically of the inverse of the distance R (real distance / phase center) absolute at the center of phase of the aerial as in the case of conventional systems described in the state of the art.

The dimensions of the linear air element, its diameter Φ, 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.

When the area to be covered has privileged directions (corridors, corridors) as on the figure 3a , the orientation of the linear elements is carried out for example tangentially to these privileged directions. When the area to be covered is a closed enclosure without privileged direction, as on the figure 3b , aerials are arranged for example tangentially to the edges of this enclosure.

• les mesures des niveaux de champs correspondant provenant des émetteurs 8, 9, 10, 11 présents dans les réseaux externes et susceptibles d'entrer en communication avec les terminaux illicites dont on veut éradiquer les radiocommunications, et
• le régime de pertes linéique explicité par la formule (1) ci-dessus, et
• de marges η destinées à compenser les atténuations supplémentaires de natures diverses qui peuvent affecter le signal de brouillage J lors de sa propagation depuis l'aérien linéique 1 jusqu'au dispositif d'émission à brouiller, 4, (murs, portes, corps humain, etc.).

The emission powers of the effector 2 are adjusted, for example taking into account one or more of the following elements:

• measurements of the corresponding field levels coming from the transmitters 8, 9, 10, 11 present in the external networks and likely to communicate with the illicit terminals whose radiocommunications are to be eradicated, and
• the linear loss regime explained by formula (1) above, and
• of margins η intended to compensate for the additional attenuation of various kinds which may affect the jamming signal J during its propagation from the linear aerial 1 to the transmitting device to be scrambled, 4 (walls, doors, human body, etc.).

• 10.log₁₀(P_S,j,f) - 10.log₁₀(P_j,f) ≤ 10.log₁₀(Seuil_S,j,f) dans la bande B_i,f de la porteuse j, f, j étant l'indice de la bande du terminal, f celui de la porteuse, ou encore :
• 10.log₁₀(P_j,f) ≥ 10.log₁₀(P_S,j,f) - 10.log₁₀(Seuil_S,j,f) dans la bande B_i,f de la porteuse f

The objective is to obtain a jamming signal J at least such that, in each band B _j j = 1 ... J and for each beacon or control channel f in each band B _j corresponding to the external transmitters likely to enter into communication with the transmitter / receiver terminals whose radio communication is to be eradicated, the power flow P _{j, f} of the jamming signal J _{j, f} in the band B _{j, f} 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 P _{S, i, f} , is received with a ratio P _{S, i, f /} P _{j, f} less than the threshold operating threshold _{S, j, f} of the portable terminal prohibited (this operating threshold Threshold _{S, j, f} being known to those skilled in the art for each radio network and for each type of carrier beacons f to prohibit, by consultation of standards of these networks). Or again, the ratio P _{S, j, f /} P _{J, f} , between the power flow P _{S, j, f} of the signal S _{j, f} potentially usable by the forbidden device on the carrier f and the power flow P _{J, f} , of the signal J _f present on the carrier f to prevent the forbidden device from operating is below the operating threshold Threshold _{S, j, f} of the forbidden device (P _{S, j, f} / P _{J, f} ≤ Threshold _{S , j, f} ). This is written in decibels:

• 10.log ₁₀ (P _{S, j, f} ) - 10.log ₁₀ (P _{j, f} ) ≤ 10.log ₁₀ (Threshold _{S, j, f} ) in the band B _{i, f} of the carrier j, f, j being the index of the band of the terminal, that of the carrier, or else:
• 10.log ₁₀ (P _{j, f} ) ≥ _10. log ₁₀ (P _{S, j, f} ) - 10.log ₁₀ (Threshold _{S, j, f} ) in the band B _{i, f} of the carrier f

soit encore: $$10.{\log }_{10}\left({\mathrm{N}}_{\mathrm{j},\mathrm{f}}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{B}}_{\mathrm{i},\mathrm{f}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)-10.{\log }_{10}\left({\mathrm{Seuil}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)+\mathrm{C}\left({\mathrm{r}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{l}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{r}}_0\right)+\mathrm{\eta }$$

où η représente une certaine marge de précaution pour prendre en compte des atténuations supplémentaires du signal de brouillage lors de sa propagation de l'aérien au terminal interdit 4.
Cette condition exprimée dans la formule (2), devant être vérifiée pour une zone définie par un rayon r₀≤r≤ r_max, l₀≤l≤L_max une condition suffisante est de la vérifier pour r= r_max, l=L_max, η=η_max $$10.{\log }_{10}\left({\mathrm{N}}_{\mathrm{j},\mathrm{f}}.{\mathrm{B}}_{\mathrm{i},\mathrm{f}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)-10.{\log }_{10}\left({\mathrm{Seuil}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)+\mathrm{C}\left({\mathrm{r}}_0\right)+\mathrm{P}\text{'}.\left({\mathrm{L}}_{\max }-{\mathrm{l}}_0\right)+10.{\log }_{10}\left({\mathrm{r}}_{\max }/{\mathrm{r}}_0\right)+{\mathrm{\eta }}_{\max }$$

Considering a terminal forbidden at the point M (r, l), 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 _{i, f} of each carrier f: $$10.{\log }_{10}\left({\mathrm{NOT}}_{\mathrm{j},\mathrm{f}}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{B}}_{\mathrm{i},\mathrm{f}}\right)-\mathrm{VS}\left({\mathrm{r}}_0\right)-\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{l}}_0\right)-10.{\log }_{10}\left(\mathrm{r}/{\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">r</figure-callout>}}_0\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)-10.{\log }_{10}\left({\mathrm{Threshold}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)+\mathrm{\eta }$$

again: $$10.{\log }_{10}\left({\mathrm{NOT}}_{\mathrm{j},\mathrm{f}}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{B}}_{\mathrm{i},\mathrm{f}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)-10.{\log }_{10}\left({\mathrm{Threshold}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)+\mathrm{<figure-callout\; id="0"\; label="VS\; r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">VS\; </figure-callout>}\left({\mathrm{r}}_{}\right)\left({\mathrm{}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{<figure-callout\; id="0"\; label="l"\; filenames="imgf0001.png"\; state="\{\{state\}\}">l</figure-callout>}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">r</figure-callout>}}_0\right)+\mathrm{\eta }$$

where η represents a certain margin of precaution to take into account additional attenuations of the jamming signal during its propagation from the air to the forbidden terminal 4.
This condition expressed in the formula (2), to be verified for a zone defined by a radius r ₀ ≤r≤r _max , l ₀ ≤l≤L _max a sufficient condition is to check for r = r _max , l = L _max , η = η _max $$10.{\log }_{10}\left({\mathrm{NOT}}_{\mathrm{j},\mathrm{f}}.{\mathrm{B}}_{\mathrm{i},\mathrm{f}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)-10.{\log }_{10}\left({\mathrm{Threshold}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)+\mathrm{<figure-callout\; id="0"\; label="VS\; r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">VS\; </figure-callout>}\left({\mathrm{r}}_{}\right)\left({\mathrm{}}_0\right)+\mathrm{P}\text{'}.\left({\mathrm{The}}_{\max }-{\mathrm{<figure-callout\; id="0"\; label="l"\; filenames="imgf0001.png"\; state="\{\{state\}\}">l</figure-callout>}}_0\right)+10.{\log }_{10}\left({\mathrm{r}}_{\max }/{\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">r</figure-callout>}}_0\right)+{\mathrm{\eta }}_{\max }$$

The illustrative and non-limiting example of figure 1 shows radio communication signals S ₈ , S ₉ , S ₁₀ , S ₁₁ from the external transmitters 8, 9, 10, 11 in bands B ₈ , B ₉ , B ₁₀ , B ₁₁ , the transmitters being able to enter. communication with the illicit terminal 4 whose radiocommunications are to be eradicated. For this configuration, if we consider a beacon carrier or external transmitter control, at carrier frequencies respectively denoted f ₈ , f ₉ , f ₁₀ , f ₁₁ , and bands respectively denoted B _{J, 8} , B _{J, 9} , B _{J, 10} , B _{J, 11} , if P _S, P _S, P _S, P _S, are noted _, the corresponding power flows received by the illegal terminal 4, if SeUil _{S is , 8} Threshold _{S, 9} Threshold _{S, 10} Threshold _{S, 11} the operating points (known to those skilled in the art) of the illegal terminal 4 in the bands B _{J, 8} , B _{J, 9} , B _{J, 10} , B _{J, 11} of the carriers f ₈ , f ₉ , f ₁₀ , f ₁₁ , the minimum interference signal levels P _{J, 8} P _{J, 9} P _{J, 10} P _{J, 11} to be received by the illegal terminal 4 in bands B _{J, 8} , B _{J, 9} , B _{J, 10} , B _{J, 11} satisfy the following conditions

• P_S,8 / P_J,8 ≤ Seuil_S,8 dans la bande B_J,8 de la porteuse f₈
• P_S,9 /P_J,9 ≤ Seuil_S,9 dans la bande B_J,9 de la porteuse f₉
• P_S,10 / P_J,10 ≤ Seuil_S,10 dans la bande B_J,10 de la porteuse f₁₀
• P_S,11 / P_J,11 ≤ Seuil_S,11 dans la bande B_J,11 de la porteuse f₁₁

In real quantities:

• P _{S, 8} / P _{J, 8} ≤ Threshold _{S, 8} in the band B _{J, 8} of the carrier f ₈
• P _{S, 9} / P _{J, 9} ≤ Threshold _{S, 9} in the band B _{J, 9} of the carrier f ₉
• P _{S, 10} / P _{J, 10} ≤ Threshold _{S, 10} in the band B _{J, 10} of the carrier f ₁₀
• P _{S, 11} / _{J P, 11 S} ≤ _{Threshold, 11} in the strip B _{J, 11} of the carrier f ₁₁

• 10.log₁₀(P_J,8)≥10.log₁₀(P_S,8)-10.log₁₀(Seuil_S,8) dans la bande B_J,8 de la porteuse f₈
• 10.log₁₀(P_J,9)≥10.log₁₀(P_S,9)-10.log₁₀(Seuil_S,9) dans la bande B_J,9 de la porteuse f₉
• 10.log₁₀(P_J,10)≥10.log₁₀(P_S,10)-10.log₁₀(Seuil_S,10) dans la bande B_J,10 de la porteuse f₁₀
• 10.log₁₀(P_J,11)≥10.log₁₀(P_S,11)-10.log₁₀(Seuil_S,11) dans la bande B_J,11 de la porteuse f₁₁, et ce,

sur la zone couverte par l'aérien linéique.In decibels:

• 10.log ₁₀ (P _{J, 8} ) ≥10.log ₁₀ (P _{S, 8} ) -10.log ₁₀ (Threshold _{S, 8} ) in the band B _{J, 8} of the carrier f ₈
• 10.log ₁₀ (P _{J, 9} ) ≥10.log ₁₀ (P _{S, 9} ) -10.log ₁₀ (Threshold _{S, 9} ) in the band B _{J, 9} of the carrier f ₉
• 10.log ₁₀ (P _{J, 10} ) ≥10.log ₁₀ (P _{S, 10} ) -10.log ₁₀ (Threshold _{S, 10} ) in the band B _{J, 10} of the carrier f ₁₀
• 10.log ₁₀ (P _{J, 11} ) ≥10.log ₁₀ (P _{S, 11} ) -10.log ₁₀ (Threshold _{S, 11} ) in the band B _{J, 11} of the carrier f ₁₁ , and this,

on the area covered by the linear overhead.

$$10.{\log }_{10}\left({\mathrm{N}}_{\mathrm{J}\mathrm{,10}}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{B}}_{\mathrm{J}\mathrm{,10}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S}\mathrm{,10}}\right)-10.{\log }_{10}\left({\mathrm{Seuil}}_{\mathrm{S}\mathrm{,10}}\right)+\mathrm{C}\left({\mathrm{r}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{l}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{r}}_0\right)+{\mathrm{\eta }}_{10}$$

$$10.{\log }_{10}\left({\mathrm{N}}_{\mathrm{J}\mathrm{,9}}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{B}}_{\mathrm{J}\mathrm{,9}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S}\mathrm{,9}}\right)-10.{\log }_{10}\left({\mathrm{Seuil}}_{\mathrm{S}\mathrm{,9}}\right)+\mathrm{C}\left({\mathrm{r}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{l}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{r}}_0\right)+{\mathrm{\eta }}_9$$

$$10.{\log }_{10}\left({\mathrm{N}}_{\mathrm{J}\mathrm{,8}}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{B}}_{\mathrm{J}\mathrm{,8}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S}\mathrm{,8}}\right)-10.{\log }_{10}\left({\mathrm{Seuil}}_{\mathrm{S}\mathrm{,8}}\right)+\mathrm{C}\left({\mathrm{r}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{l}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{r}}_0\right)+{\mathrm{\eta }}_8$$

où η₈ η₉ η₁₀ η₁₁ représentent certaines marges de précaution pour prendre en compte des atténuations supplémentaires du signal de brouillage lors de sa propagation de l'aérien au terminal interdit 4 dans les bandes B₈, B₉, B₁₀, B₁₁.It can be deduced that the injected power spectral density levels N _{S, 8} N _{S, 9} N _{S, 10} N _{S, 11} in the overhead line via the connector 3 must verify the following conditions in decibels: $$10.{\log }_{10}\left({\mathrm{NOT}}_{\mathrm{J}11}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{B}}_{\mathrm{J}11}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S}11}\right)-10.{\log }_{10}\left({\mathrm{Threshold}}_{\mathrm{S}11}\right)+\mathrm{<figure-callout\; id="0"\; label="VS\; r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">VS\; </figure-callout>}\left({\mathrm{r}}_{}\right)\left({\mathrm{}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{<figure-callout\; id="0"\; label="l"\; filenames="imgf0001.png"\; state="\{\{state\}\}">l</figure-callout>}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">r</figure-callout>}}_0\right)+{\mathrm{\eta }}_{11}$$

$$10.{\log }_{10}\left({\mathrm{NOT}}_{\mathrm{J}10}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{<figure-callout\; id="10"\; label="B\; J"\; filenames="imgf0001.png"\; state="\{\{state\}\}">B\; </figure-callout>}}_{\mathrm{J}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S}10}\right)-10.{\log }_{10}\left({\mathrm{<figure-callout\; id="10"\; label="Threshold\; S"\; filenames="imgf0001.png"\; state="\{\{state\}\}">Threshold\; </figure-callout>}}_{\mathrm{S}}\right)+\mathrm{<figure-callout\; id="0"\; label="VS\; r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">VS\; </figure-callout>}\left({\mathrm{r}}_{}\right)\left({\mathrm{}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{<figure-callout\; id="0"\; label="l"\; filenames="imgf0001.png"\; state="\{\{state\}\}">l</figure-callout>}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">r</figure-callout>}}_0\right)+{\mathrm{<figure-callout\; id="10"\; label="\eta "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\eta </figure-callout>}}_{10}$$

$$10.{\log }_{10}\left({\mathrm{NOT}}_{\mathrm{J}9}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{<figure-callout\; id="9"\; label="B\; J"\; filenames="imgf0001.png"\; state="\{\{state\}\}">B\; </figure-callout>}}_{\mathrm{J}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S}9}\right)-10.{\log }_{10}\left({\mathrm{<figure-callout\; id="9"\; label="Threshold\; S"\; filenames="imgf0001.png"\; state="\{\{state\}\}">Threshold\; </figure-callout>}}_{\mathrm{S}}\right)+\mathrm{<figure-callout\; id="0"\; label="VS\; r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">VS\; </figure-callout>}\left({\mathrm{r}}_{}\right)\left({\mathrm{}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{<figure-callout\; id="0"\; label="l"\; filenames="imgf0001.png"\; state="\{\{state\}\}">l</figure-callout>}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">r</figure-callout>}}_0\right)+{\mathrm{<figure-callout\; id="9"\; label="\eta "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\eta </figure-callout>}}_9$$

$$10.{\log }_{10}\left({\mathrm{NOT}}_{\mathrm{J}8}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{<figure-callout\; id="8"\; label="B\; J"\; filenames="imgf0001.png"\; state="\{\{state\}\}">B\; </figure-callout>}}_{\mathrm{J}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S}8}\right)-10.{\log }_{10}\left({\mathrm{<figure-callout\; id="8"\; label="Threshold\; S"\; filenames="imgf0001.png"\; state="\{\{state\}\}">Threshold\; </figure-callout>}}_{\mathrm{S}}\right)+\mathrm{<figure-callout\; id="0"\; label="VS\; r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">VS\; </figure-callout>}\left({\mathrm{r}}_{}\right)\left({\mathrm{}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{<figure-callout\; id="0"\; label="l"\; filenames="imgf0001.png"\; state="\{\{state\}\}">l</figure-callout>}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{<figure-callout\; id="0"\; label="r"\; filenames="imgf0001.png"\; state="\{\{state\}\}">r</figure-callout>}}_0\right)+{\mathrm{<figure-callout\; id="8"\; label="\eta "\; filenames="imgf0001.png"\; state="\{\{state\}\}">\eta </figure-callout>}}_8$$

where η ₈ η ₉ η ₁₀ η ₁₁ represent certain precautionary margins to take into account additional attenuations of the jamming signal during its propagation from the aerial to the forbidden terminal 4 in the bands B ₈ , B ₉ , B ₁₀ , B ₁₁ .

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.

For example, it is possible to use dedicated second, third and fourth generation radio-cell jammers, GPS (Global Positioning System) jammers operating the ISM Industrial 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).

• une inhomogénéité des pertes de câbles en fonction des fréquences (aériens linéiques dispersifs),
• une inhomogénéité des niveaux de signaux S₈, S₉, S₁₀, S₁₁ reçus par les systèmes de radiocommunication illicites et que l'on veut brouiller.

It is also possible to use an additional device adapted to straighten power levels by amplification and dedicated filtering of each subband to compensate, if necessary, a frequency dispersion of the necessary emission levels (see FIG. figure 1 ) and especially:

• inhomogeneity of cable losses as a function of the frequencies (dispersive linear overhead),
• an inhomogeneity of the signal levels S ₈ , S ₉ , S ₁₀ , S ₁₁ received by the illicit radio systems and which one wants to scramble.

According to another variant embodiment, 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.

1. 1) définir la disposition des aériens linéiques dans une zone à contrôler dans laquelle les radiocommunications illicites doivent être empêchées,
2. 2) définir des paramètres pour un signal de brouillage: bande de fréquence, niveaux de flux de puissance de brouillage dans la zone à contrôler exprimés en fonction notamment des distances radiales des différents points de la zone aux aériens linéiques disposés pour couvrir ladite zone, des mesures de niveaux de champs ou des éléments précités,
3. 3) émettre un signal de puissance adaptée à brouiller les dispositifs illicites présents dans la zone contrôlée à partir des aériens linéiques qui y sont disposés, le niveau de signal étant tel que le rapport entre le flux de puissance de fonctionnement du dispositif illicite et le flux de puissance du signal de brouillage est inférieur à la valeur seuil de fonctionnement du dispositif illicite.

The method according to the invention associated with the example of figure 1 for example, includes the following steps:

1. 1) to define the arrangement of line-spacecraft in a zone to be controlled in which illicit radiocommunications must be prevented,
2. 2) define parameters for an interference signal: frequency band, interference power flow levels in the area to be controlled expressed as a function in particular of the radial distances of the various points of the zone with linear airs arranged to cover said zone, measurements of field levels or of the aforementioned elements,
3. 3) to emit a power signal adapted to scramble the illicit devices present in the controlled zone from the linear aerials which are arranged therein, the signal level being such that the ratio between the operating power flow of the illicit device and the flow interference signal power is less than the operating threshold value of the illicit device.

The figure 2 is a detail of an example of a linear cable comprising a plurality of orifices arranged to allow the passage of jamming 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.

The figure 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 opposite ends of the element, as described above.

The openings of the linear element allow the emission of interference signals J ₁ , J ₂ , the mobile phone 4 located in the corridor can 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.

The figure 3b , schematizes an alternative embodiment of the invention in an enclosure having no preferred direction, in which four linear elements 311, 312, 313, 314, of length L ₂ , L ₁ , L ₂ , L ₁ , respectively, have been installed. at the unrepresented walls of a piece of square geometry to be monitored and two effectors 315, 316 at the opposite ends of one of the diagonals of the part, as described above. The effector 315 is connected according to an arrangement described in figure 1 at the two linear elements 311, 312, the effector 316 is in connection with the linear elements 313, 314. The orifices of the four linear elements allow the emission of interference signals J ₁ , 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.

The figure 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 aerial 41 via a second connector 43b in order to inject a jamming signal J ₁ , J ₂ , at each end of the linear overhead 41. In this case, the first and second effector have substantially identical characteristics (same levels). emission, 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 the linear air.

• de mieux homogénéiser le niveau du signal J de brouillage dans les aériens linéiques grâce à une propagation à double sens, et de garantir une meilleure couverture du brouillage,
• de réduire les niveaux d'émission du signal de brouillage aux extrémités de l'aérien linéique et de garantir de ce fait un meilleur confinement du brouillage.

This embodiment allows in particular:

• to better homogenize the level of the jamming J signal in linear aerials by means of two-way propagation, and to guarantee a better coverage of the interference,
• to reduce the emission levels of the jamming signal at the ends of the overhead line and thus to ensure better confinement of the interference.

Without departing from the scope of the invention, other variants of implementation of the invention are possible.

For example, it is possible to add baffles to the device to locally optimize the confinement. For the nature, shape and size of the baffles, it is possible to use: grilles for the passage of electric cables (frequencies> 900 MHz) with inverted mounting, meshes and various geometries. The example of an open rectangular grid aperture.≥ (λ / 2) ² (At: wavelength of the interference emission) leads to a directivity of about 120 °, a Forward / Back ratio of the order of 10 to 15 dB). This facilitates the confinement of the jamming signal during installation in "semi-open environment", for example for windows prisons or window examination / conference rooms, or when there are diffraction problems (metal pipes, other).

Another variant is to add a metrology in phase installation / maintenance which facilitates the installation and adjustment of the device. For this purpose, it is possible to use a spectrum analyzer, or else mobile spectrum control stations known to those skilled in the art.

According to another variant embodiment, it is possible to add a totally controlled "over-network" of wired communications, or else an "over-network" of communications using line currents, etc.

• choix de fréquences porteuses d'après un relevé préalable des planifications en fréquence des réseaux externes selon des procédés connus de l'homme de l'art.
• le cas échéant, excision en fréquence du signal de brouillage pour « libérer » les porteuses et les rendre exploitables.
• installation d'un micro réseau local exploitant les porteuses libérées et relais vers réseau externe.

According to another variant embodiment, it is possible to add a completely controlled "on-board" radio-communications network, by means of the following elements:

• choice of carrier frequencies according to a preliminary survey of the frequency schedules of the external networks according to methods known to those skilled in the art.
• if necessary, frequency excision of the scrambling signal to "release" the carriers and make them exploitable.
• installation of a local area network microphone using the released carriers and relay to external network.

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.

• une éradication totale des radiocommunications dans la gamme 0,3 - 3 GHZ, avec un seul dispositif selon l'invention,
• un confinement du brouillage à une zone donnée sans impact sur l'environnement extérieur, en raison de la nature linéique de l'aérien et du régime de pertes cylindriques qui en découle selon la formulation (1),
• une souplesse d'installation, avec un déploiement de dispositifs « à la carte »,
• une facilité de maintenance,
• de nombreuses possibilités d'extension en termes de fonctions ajoutées et en termes de services.

The device and the method according to the invention notably have the following advantages:

• a total eradication of radiocommunications in the range 0.3 - 3 GHZ, with a single device according to the invention,
• containment of the interference to a given area without impact on the external environment, because of the linear nature of the aerial and the consequent loss of cylindrical losses according to the formulation (1),
• flexibility of installation, with a deployment of "à la carte" devices,
• ease of maintenance,
• many possibilities of extension in terms of added functions and in terms of services.

Claims (11)

1. A contained jamming device arranged in a coverage zone in which there can be prohibited radio communication devices, the operation of which it is sought to prevent, characterized in that it comprises at least the following elements:

   • at least one linear cable (1) comprising a plurality of orifices Oi allowing the radiation of jamming signals, the linear cable (1) being linked to one or more effectors (2) via a connector (3),

   • said effector element or elements (2), being adapted for injecting, at at least one end of the linear cable (1), one or more jamming signals, the power flux P_j,f of the jamming signal J_j,f in the band B_j,f of a carrier f is chosen such that the ratio P_S,j/P_J,f between the power flux P_S,j,f of the signal S_j,f potentially usable by the prohibited device on the carrier f and the power flux P_J,f, of the signal J_f present on the carrier f to prevent the prohibited device from operating is below the operating threshold Seuil_S,j,f of the prohibited device (P_S,j/P_J,f ≤ Seuil_S,j,f) and in that

   • the effector or effectors (2) are adapted to generate, for a point M(r,l) where a prohibited radio communication device (4) is located, a value of the spectral density N_j,f(r,l) of the jamming signal injected into the linear antenna via the connector (3) such that, for the band B_i,f of each carrier f, the following applies: $$10.{\log }_{10}\left({\mathrm{N}}_{\mathrm{j},\mathrm{f}}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{B}}_{\mathrm{i},\mathrm{f}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)-10.{\log }_{10}\left({\mathrm{Seuil}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)+\mathrm{C}\left({\mathrm{r}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{l}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{r}}_0\right)+\mathrm{\eta }$$

   

   in which

   • r, l are the coordinates of a point M,

   • l₀ designates a reference linear distance, r₀ designates a reference radial distance to the linear element,

   • P' designates the rate of the linear losses along the antenna radiating from the distance l₀,

   • -C(r₀) designates the losses by coupling in the band B_J at the reference radial distance r₀,

   • η represents a safety margin taking account of the additional attenuations of the jamming signal in its propagation from the antenna to the prohibited terminal.
2. The jamming device as claimed in claim 1, characterized in that said effector (2) is adapted for generating a transmission power taking account of one or more of the following elements:

   - the measurements of the levels of the beacon, control and traffic signals originating from transmitters (8, 9, 10, 11) present in the external networks and likely to enter into communication with the illicit devices,

   - the rate P' of linear losses in the linear cable,

   - the losses by couplings -C(r₀) of the linear cable,

   - margins η intended to compensate for the additional attenuations of various natures which can affect the jamming signal J in its propagation from the linear cable (1) to the device (4) to be jammed.
3. The jamming device as claimed in claim 1, in which the characteristics of the prohibited radio communication devices and the characteristics of the cable radiation regime are previously known or measured to parameterize and set the frequency bands of the jamming signal, the nature of the jamming signals transmitted and the levels at the output of the effector whose signal is injected into the linear cable via the coupler (3).
4. The jamming device as claimed in one of the preceding claims, characterized in that at least one of the effectors (2) is adapted for generating and transmitting jamming signals and is a wideband generic jammer.
5. The jamming device as claimed in one of the preceding claims, characterized in that the effector (2) is adapted for generating and transmitting jamming signals and is composed of a set of dedicated jammers, the output signals of which are transmitted to filtering and amplification and rectification modules (6, 6'), then injected into a coupler (7), the output of said coupler (7) being injected into the linear cable (1).
6. The jamming device as claimed in one of the preceding claims, characterized in that the effector (2) is adapted for generating and transmitting jamming signals and comprises frequency-selective filtering modules adapted for excising the jamming signal to free up one or more carriers that can be used by a controlled radio communication sub-network.
7. The jamming device as claimed in one of the preceding claims, characterized in that it comprises a means adapted for duplexing the signal at the output of an effector and a device for injecting said signal into two different linear cables.
8. The jamming device as claimed in one of the preceding claims, characterized in that it comprises a first effector (42a) arranged at a first end (41a) of the linear cable (41) and a second effector (42b) arranged at a second end (41b) of the linear cable in order to inject a jamming signal J₁, J₂, at each end of the linear cable (41).
9. The jamming device as claimed in one of the preceding claims, characterized in that it comprises a system of baffles adapted for locally optimizing the containment, such as electric cable entry gratings with inverted mounting, gratings of various meshes and geometries.
10. A method for contained jamming of the operation of one or more radio communication devices prohibited in a given zone, implemented in the device as claimed in one of claims 1 to 9, characterized in that it comprises at least the following steps:

    • using at least one linear cable (1) comprising a plurality of orifices Oi allowing the radiation of jamming signals, the linear cable being linked to one or more effectors (2) via a connector (3),

    • injecting, at at least one end of the linear cable (1), one or more jamming signals, the power flux P_j,f of the jamming signal J_j,f in the band B_j,f of a carrier f being chosen such that the ratio P_S,j,f/P_J,f between the power flux P_S,j,f of the signal S_j,f potentially usable by the prohibited device on the carrier f and the power flux P_J,f of the signal J_f present on the carrier f to prevent the prohibited device from operating is below the operating threshold Seuil_S,j,f of the prohibited device (P_S,j,f/P_J,f ≤ Seuil_S,j,f).
11. The contained jamming method as claimed in claim 10, characterized in that a value of the spectral density N_j,f(r,l) is generated for the jamming signal injected into the linear cable such that, for the band B_i,f of each carrier f: $$10.{\log }_{10}\left({\mathrm{N}}_{\mathrm{j},\mathrm{f}}\left(\mathrm{r},\mathrm{l}\right).{\mathrm{B}}_{\mathrm{i},\mathrm{f}}\right)\ge 10.{\log }_{10}\left({\mathrm{P}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)-10.{\log }_{10}\left({\mathrm{Seuil}}_{\mathrm{S},\mathrm{j},\mathrm{f}}\right)+\mathrm{C}\left({\mathrm{r}}_0\right)+\mathrm{P}\text{'}.\left(\mathrm{l}-{\mathrm{l}}_0\right)+10.{\log }_{10}\left(\mathrm{r}/{\mathrm{r}}_0\right)+\mathrm{\eta }$$

    

    in which

    • r, l are the coordinates of a point M,

    • l₀ designates a reference linear distance,

    • r₀ designates a reference radial distance to the linear element,

    • P' designates the rate of the linear losses along the cable radiating from the distance l₀,

    • -C(r₀) designates the losses by coupling in the band B_J at the reference radial distance r₀,

    • η represents a safety margin taking account of the additional attenuations of the jamming signal in its propagation from the linear cable to the prohibited terminal.

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