EP2652894B1 - Störsignalerzeuger - Google Patents

Störsignalerzeuger Download PDF

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Publication number
EP2652894B1
EP2652894B1 EP11830082.1A EP11830082A EP2652894B1 EP 2652894 B1 EP2652894 B1 EP 2652894B1 EP 11830082 A EP11830082 A EP 11830082A EP 2652894 B1 EP2652894 B1 EP 2652894B1
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Prior art keywords
frequency
network
signal
jamming
frequency channels
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Application number
EP11830082.1A
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English (en)
French (fr)
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EP2652894A2 (de
Inventor
Hervé HOUIX
David Bazin
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Thales SA
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Thales SA
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    • 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
    • H04K3/42—Jamming having variable characteristics characterized by the control of the jamming frequency or wavelength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/20—Countermeasures against jamming
    • H04K3/28—Countermeasures against jamming with jamming and anti-jamming mechanisms both included in a same device or system, e.g. wherein anti-jamming includes prevention of undesired self-jamming resulting from jamming
    • 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
    • H04K3/00—Jamming of communication; Counter-measures
    • H04K3/40—Jamming having variable characteristics
    • H04K3/46—Jamming having variable characteristics characterized in that the jamming signal is produced by retransmitting a received signal, after delay or processing

Definitions

  • the invention relates to a parasitic signal generator and applies in particular to the telecommunications field.
  • Spurious signal generation is a technique intended to prevent the use of a portion of the electromagnetic spectrum by third party telecommunications networks, while allowing its use by so-called friend networks. .
  • Some telecommunications networks are designed to make it difficult to jam their transmitted signals. For this, it is particularly possible to use transmission techniques with frequency hopping. These systems are called frequency evasion systems and are usually referred to by the acronym EVF.
  • a follower jammer comprises means for synchronizing with the emissions of the EVF system to be scrambled, in particular by implementing a frequency analysis on the spectrum to be protected.
  • a scrambling signal can thus be emitted at the same time and on a frequency band adapted to the emissions of the EVF system. It is then possible to fight effectively against fast EVF communications, that is to say communications with a rate of frequency hopping greater than 100 jumps per second, and this with a jamming signal concentrated on a frequency channel, a frequency channel designating a frequency band centered on a so-called central frequency. The spreading of the jamming power is thus limited.
  • the paralleling of reception channels allows to increase the instantaneous scrambling band. However, this type of jammer only allows scrambling one EVF system at a time.
  • a second type of jammers uses the dam scrambling technique.
  • the scrambling signal is then a broadband signal and there is spreading of the scrambling power on this band.
  • This type of interference makes it possible in particular to fight effectively against evasion-fast EVF frequency communications.
  • This interference is usually limited to an instant band of a few tens of MHz wide. Since the interfering signal is broadband, it is therefore difficult to protect the host systems using frequencies included in the scrambled frequency band. In addition, the implementation of this type of interference is not discrete.
  • a third type of jammer is called a repeater scrambler.
  • This type of jammer records the signal received by the scrambling device and re-transmits the recorded signal. It is thus possible to fight efficiently against fast EVF communications.
  • the emitted interfering signal is focused on a frequency channel. The spread of interference power is thus limited.
  • the disadvantage is that the networks to be scrambled are not distinguished from the friendly networks.
  • Friendly networks can be scrambled. Indeed, the temporal processing of the signal received by the jammer, that is to say the recording and retransmission of the signal in a given time window, does not protect the friendly systems.
  • the document US2007 / 0116093 A1 proposes a scrambler that contains synchronization means to know the frequencies used by a friend network.
  • the synchronization means operate using a GPS receiver.
  • the subject of the invention is a device for jamming the transmissions of at least one enemy telecommunications network, said device comprising means for periodically receiving and memorizing signals in a reception band Br in a reception time window of fixed term ⁇ 0 .
  • the device comprises means for frequency analysis of said stored signals and detections of the frequency channels used by the telecommunications networks emitting in the band Br, means for generating a scrambling signal capable of jamming the signals present on the detected frequency channels, the device further comprising means for knowing the frequency channels used by at least one friendly network and setting implement a follower function allowing the device to synchronize on the frequency-evading friendly network or networks, the scrambling signal being adapted so as to scramble the frequency channels used by the enemy network without interfering with the frequency channels used by the friend network.
  • a reception time window is periodically open every ⁇ 0 seconds, ⁇ 0 being called the opening period, the interference signal being adapted periodically on the basis of the analysis and detection carried out in these windows.
  • the opening period ⁇ 0 is chosen as a function of the speed of the frequency jumps of the emissions to be scrambled.
  • a fast Fourier transform applied to the stored signal is for example used for frequency analysis.
  • a signal is detected for example when the result values obtained by application of the Fast Fourier Transform exceed a first predetermined threshold value and / or do not exceed a second predetermined threshold value.
  • the emission of the jamming signal is interrupted at the opening of the reception time window.
  • the scrambling signal preceding the last reception time window is re-transmitted during the processing time ⁇ C for the analysis and detection (302) of the memorized signal.
  • the functions of analysis, detection and generation of the scrambling signal can be implemented in an ASIC or FPGA type circuit.
  • the device cooperates with supervision means, said means making it possible to know the frequencies used by the friendly networks.
  • the device comprises, for example, means for communicating by wire connection with the supervision means.
  • the supervision means are for example implemented by a device belonging to the friend network, said equipment being installed so as to cooperate with the device.
  • the device comprises for example means for communicating wirelessly with the supervision means (401).
  • the invention also relates to a scrambling system emissions of at least one enemy telecommunications network, said system being composed of a first and a second device.
  • the first and the second device communicate by optical link, wired or wireless.
  • the invention has the particular advantage of allowing to scramble a plurality of networks EVF without requiring synchronization to any of these networks.
  • the energy of the scrambling is concentrated only on the frequencies used by the networks to be scrambled, in other words, the interference is of the narrowband type.
  • a repeater scrambler periodically makes a recording of the signal it receives and then re-transmits it several times.
  • the recorded signal extracts serve to jam the emissions of the present telecommunications networks because the re-transmitted signals correspond to the frequency bands used by these networks.
  • the use of this type of jammer is limited because all the signals in its reception band are scrambled. This implies that friends networks are also scrambled.
  • the scrambler according to the invention makes it possible to scramble a plurality of networks while having the possibility of allowing the signals emitted by friendly networks to pass. For this, periodic and systematic interference is applied while using a frequency analysis, said processing having for objective to protect certain levels, that is to say certain frequency channels used during a given period by one or more friendly networks.
  • the figure 1 illustrates in a simplified manner the principle of the jammer according to the invention.
  • two EVF networks to scramble emit signals at different times. These emissions are represented on a two-dimensional graph.
  • the abscissa axis corresponds to the axis of the frequencies and the y-axis corresponds to the time axis. Emissions associated with two EVF networks to be scrambled are shown.
  • two successive emissions 100, 101 are represented at times t 1 , t 2 . These emissions are of different durations and come from a first network EVF.
  • the principle of the invention is to regularly open a reception window called opening window. During the duration of this window, a frequency detection is performed on the received signal. If the presence of one or more signals is detected, then the scrambling is enabled, i.e. a scrambling signal adapted to the results of the detection is emitted. This adaptation corresponds to the generation of a scrambling signal covering only the portions of the frequency band used by the detected networks.
  • the scrambler has aperture windows 106, 107, 108, 109, 110, 111, 112, 113, 114, 115 of duration ⁇ 0 .
  • This duration ⁇ 0 is called the opening time in the following description. These opening windows are available for example periodically every ⁇ 0 seconds. This duration of opening period ⁇ 0 can be chosen according to the speed of jumps of the emissions to be scrambled.
  • the emission of the jamming signal is interrupted when the window is opened.
  • the signal received by the jammer during the duration ⁇ 0 is stored.
  • the purpose of frequency detection is to determine the frequencies on which signals corresponding to radio transmissions are present. For this, the stored signal portion of duration ⁇ 0 must be analyzed. This analysis requires the implementation of calculations and therefore requires, to be executed, a certain processing time ⁇ C following the opening window.
  • the portion of signal to be analyzed for detection is acquired and analyzed.
  • the characteristics of the jamming signal are available after the analysis.
  • a scrambling signal for interfering with the two detected channels is then transmitted by the scrambler.
  • the scrambler according to the invention makes it possible to simultaneously scramble a plurality of transmissions from different telecommunication networks.
  • the Figures 2A and 2B provide examples illustrating the impact of the interference rate.
  • the interference rate noted R b corresponds to the proportion between the jamming time and the non-jamming time, the jamming time corresponding to the time during which an interference signal is emitted.
  • the Figure 2A gives an example of a scenario in which two frequency channels are used by an EVF network for its broadcasts.
  • the scrambler according to the invention comprises means for determining the frequencies present in the spectrum using the signal portions received by the scrambler during the opening windows 200 of duration ⁇ 0 .
  • the processing time ⁇ C is considered negligible.
  • emissions from the EVF network are scrambled half the time.
  • Most EVF networks designed to resist interference are implemented in such a way that digital data is transmitted with a high level of redundancy. For this, low efficiency channel codes are used. In this case, the redundancy makes it possible to make the transmissions robust against jammers allowing low interference rates, for example of the order of 0.5.
  • the Figure 2B gives an example of a scenario in which two frequencies are used by an EVF network for its emissions, a scrambler operating with a scrambling rate greater than 0.7.
  • the processing time ⁇ C is taken into account.
  • the processing time ⁇ c it is possible either not to emit a scrambling signal 204 or to re-transmit the scrambling signal 202, 203 on the same frequency channels as those used before the last window. 'opening.
  • the emissions from the EVF network may have been subject to frequency hopping. Therefore, the re-transmitted scrambling signal 202 during the processing time ⁇ C will not be transmitted on the frequency band used by the EVF network during this time.
  • the jamming signal 203 is transmitted on the frequency channel actually used by the network EVF.
  • a first stage 308 includes a first CAN 300 digital analog type converter whose purpose is to convert the received signal from a receiving radio frequency circuit.
  • This stage 308 also comprises a second digital-analog converter CNA 305 whose function is to convert the digital version of the scrambling signal to be transmitted into an analog version subsequently transmitted to a radio frequency circuit for transmission.
  • a first analysis function block 301 takes as input the converted digital signal and makes it possible to record the signal over a period of time ⁇ o then the frequency analysis of said recorded signal.
  • a Fast Fourier Transform FFT an acronym derived from the English expression "Fast Fourrier Transform” can be used.
  • FFT Fast Fourier Transform
  • the result of the FFT transform is used by a detection function block 302 for comparing said results with a threshold value so as to determine the presence of transmissions from one or more networks and the frequency channels used for these. emissions.
  • the detected channels to be scrambled are then used by a multi-waveform generator block 304, implementing a Multi-FOB algorithm with reference to the expression "Multi-Waveform of Scrambling".
  • This functional block 304 aims to generate a digital version of the scrambling signal, said signal making it possible to scramble the frequency channels indicated by the detection logic unit 302.
  • the Multi-FOB block 304 is selected so as to be able to generate a jamming signal covering up to 6 frequency channels simultaneously.
  • the digital scrambling signal is then converted to an analog signal by the DAC 305 to be transmitted by the scrambler.
  • a function block 303 for protecting the friendly networks indicates which are the frequency channels used by these networks to the detection logic blocks 302 and / or to the block implementing the Multi-FOB 304 algorithm. that the scrambling signal does not cover the frequencies used by the friendly networks.
  • the channel information used by the protection block of the friendly networks 303 can enable the detection block 302 to ignore certain frequency channels for which a signal has been detected because of exceeding a threshold value. predetermined.
  • the detection block thus transmits as information to the Multi-FOB block 304 only the frequencies used by networks other than the friendly networks.
  • the processing circuit 309 may be controlled by a host equipment 310, a computer for example.
  • a host equipment 310 a computer for example.
  • This comprises a human-machine interface 306 which makes it possible in particular to display graphically on a screen the result of the frequency analysis 301 in the form of spectral lines.
  • the host equipment 310 includes supervising means 307 transmitting for example a frequency mask, that is to say information to know which frequencies are used by the friendly networks, to the functional block 303 of protection networks 309 of the processing circuit 309.
  • These supervision means 307 may be either internal to the host equipment as shown in the figure, or external such as a follower scrambler configured in interception-detection mode.
  • Such a device has, for example, the ability to receive signals for their analysis and for frequency detection on a band a few tens of MHz because of the analysis algorithms used 301, even if the radio frequency circuits used have capacities usually greater If one wants to cover a wider band, it is possible to use in parallel a plurality of converter blocks CAN 308 and analysis blocks 309 covering separate bands.
  • the figure 4 gives an example of a scenario in which a scrambling device according to the invention can be used.
  • the goal is to disrupt the 402, 403, 404 communications of three enemy EVF networks while avoiding disrupting the 405 communications of a friend's EVF network.
  • a scrambling device 400 emits a scrambling signal 406 making it possible to disturb the communications of 3 enemy networks on the basis of the analysis of the received signals 407 originating from these networks.
  • the jamming signal is generated so that said friendly network can function normally because the jamming signal does not interfere with its emissions.
  • Supervisory means 401 may be external to the scrambling device, as explained above. It is then in the presence of a cooperative approach between two distinct devices 400, 401. These two devices are for example connected by wire connection or wirelessly.
  • the friend network communicates information enabling the device 401 to be synchronized.
  • a device of the friend network is installed so as to cooperate with the jammer.
  • the supervision means 401 are such that they allow the device to synchronize with the friend station according to the interception-detection / follower method. In this case, it is not necessary for a friend's network equipment to be installed with the scrambler.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Claims (14)

  1. Vorrichtung zur Störung von Sendungen von mindestens einem feindlichen Telekommunikationsnetzwerk, wobei die Vorrichtung Mittel zum periodischen Empfangen und Speichern (300, 301) von Signalen in einem Empfangsband Br innerhalb eines Empfangszeitfensters festgelegter Dauer δ0 beinhaltet, dadurch gekennzeichnet, dass sie Mittel zur Frequenzanalyse (301) der gespeicherten Signale und zum Erkennen (302) der von den Telekommunikationsnetzwerken verwendeten Frequenzkanäle beinhaltet, welche in dem Band Br senden, Mittel zum Erzeugen (304) eines Störsignals, welches in der Lage ist, die in den erkannten Frequenzkanälen vorhandenen Signale zu stören, wobei die Vorrichtung zudem Mittel zum Kennen der Frequenzkanäle beinhaltet, welche durch mindestens ein befreundetes Netzwerk (303, 307) verwendet werden, wobei das Störsignal so angepasst ist, dass es die vom feindlichen Netzwerk verwendeten Frequenzkanäle stört, ohne die vom befreundeten Netzwerk verwendeten Frequenzkanäle zu stören,
    dadurch gekennzeichnet, dass die Mittel zum Erfahren der von dem oder den befreundeten Netzwerk(en) verwendeten Frequenzkanäle eine Funktion vom Typ Mitlauf umsetzen, welche es der Vorrichtung erlauben, sich mit dem oder den befreundeten Netzwerk(en) mit Frequenzsprung zu synchronisieren, um die vom befreundeten Netzwerk verwendeten Frequenzen zu bestimmen.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass ein Empfangszeitfenster (106, 107, 108, 109, 110, 111, 112, 113, 114, 115) periodisch alle Δ0 Sekunden geöffnet wird, wobei Δ0 als Öffnungsperiode bezeichnet wird, wobei das Störsignal periodisch auf der Grundlage der in diesen Fenstern angestellten Analyse und Detektion angepasst wird.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass die Öffnungsperiode Δ0 in Abhängigkeit von der Geschwindigkeit der Frequenzsprünge der zu störenden Sendungen gewählt wird.
  4. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine auf das gespeicherte Signal angewandte schnelle Fourier-Transformation für die Frequenzanalyse (301) eingesetzt wird.
  5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, dass ein Signal erkannt (302) wird, wenn die durch Anwendung der schnellen Fourier-Transformation erzielten Ergebniswerte einen ersten vorbestimmten Schwellenwert überschreiten und/oder einen zweiten vorbestimmten Schwellenwert nicht überschreiten.
  6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Sendung des Störsignals beim Öffnen des Empfangszeitfensters unterbrochen wird.
  7. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Störsignal, welches dem letzten Empfangszeitfenster vorausgegangen ist, über die Verarbeitungszeit δc zur Analyse (301) und zur Erkennung (302) des gespeicherten Signals erneut gesendet wird.
  8. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Funktionen zur Analyse (301), zur Erkennung (302) und zur Erzeugung des Störsignals (304) in einem Schaltkreis vom Typ ASIC oder FPGA umgesetzt werden.
  9. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sie mit Überwachungsmitteln (401) zusammenarbeitet, wobei diese Mittel es ermöglichen, die von den befreundeten Netzwerken verwendeten Frequenzen zu erfahren.
  10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass sie Mittel zur drahtgebundenen Kommunikation mit den Überwachungsmitteln (401) beinhaltet.
  11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Überwachungsmittel (401) durch eine Ausrüstung umgesetzt werden, welche zum befreundeten Netzwerk gehört, wobei die Ausrüstung so installiert ist, dass sie mit der Vorrichtung zusammenarbeitet.
  12. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass sie Mittel zur drahtlosen Kommunikation mit den Überwachungsmitteln (401) beinhaltet.
  13. System zum Stören der Sendungen mindestens eines feindlichen Telekommunikationsnetzwerks, wobei das System aus einer ersten und einer zweiten Vorrichtung besteht, wobei die erste Vorrichtung Folgendes beinhaltet:
    • Mittel zum periodischen Empfangen und Speichern (300, 301) von Signalen in einem Empfangsband Br innerhalb eines Empfangszeitfensters festgelegter Dauer δ0,
    • Mittel zur Frequenzanalyse (301) der gespeicherten Signale und zum Erkennen (302) der von den Telekommunikationsnetzwerken verwendeten Kanäle, welche in dem Band Br senden, Mittel zum Erzeugen (304) eines Störsignals, welches in der Lage ist, die in den erkannten Frequenzkanälen vorhandenen Signale zu stören,
    • Mittel zum Zusammenarbeiten mit der zweiten Vorrichtung, um die von mindestens einem befreundeten Netzwerk (303, 307) verwendeten Frequenzkanäle zu erfassen, wobei das Störsignal so angepasst ist, dass es die vom feindlichen Netzwerk verwendeten Frequenzkanäle stört, ohne die Frequenzkanäle zu stören, die als die vom befreundeten Netzwerk verwendeten Kanäle identifiziert wurden,
    und wobei die zweite Vorrichtung Folgendes beinhaltet:
    • Mittel zum Erkennen der von mindestens einem befreundeten Netzwerk (303, 307) verwendeten Frequenzkanäle, und wobei das System dadurch gekennzeichnet ist, dass die Mittel der zweiten Vorrichtung eine Funktion vom Typ Mitlauf umsetzen, welche es der Vorrichtung erlauben, sich mit dem oder den befreundeten Netzwerk(en) mit Frequenzsprung zu synchronisieren und die vom befreundeten Netzwerk verwendeten Frequenzen zu bestimmen.
  14. System nach Anspruch 13, bei welchem die erste und die zweite Vorrichtung miteinander über eine optische Verbindung, drahtgebunden oder drahtlos kommunizieren.
EP11830082.1A 2010-12-17 2011-12-16 Störsignalerzeuger Active EP2652894B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1004940A FR2969434B1 (fr) 2010-12-17 2010-12-17 Generateur de signal parasite
PCT/EP2011/073153 WO2012080507A2 (fr) 2010-12-17 2011-12-16 Generateur de signal parasite

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Publication Number Publication Date
EP2652894A2 EP2652894A2 (de) 2013-10-23
EP2652894B1 true EP2652894B1 (de) 2018-07-25

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FR (1) FR2969434B1 (de)
WO (1) WO2012080507A2 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2064272B (en) * 1979-11-12 1983-11-23 Racal Mesl Ltd Apparatus for regenerating signals within a frequency band
US7035311B2 (en) * 2001-12-05 2006-04-25 Sicom Systems, Ltd. Apparatus and method for a digital, wideband, intercept and analysis processor for frequency hopping signals
US7126979B2 (en) * 2003-08-18 2006-10-24 Networkfab Corporation System and method to autonomously and selectively jam frequency hopping signals in near real-time
US7436877B2 (en) * 2004-08-06 2008-10-14 Agilent Technologies, Inc. Method and apparatus to perform surgical reactive jamming while maintaining simultaneous tactical communications

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EP2652894A2 (de) 2013-10-23
WO2012080507A2 (fr) 2012-06-21
WO2012080507A3 (fr) 2012-08-09
FR2969434B1 (fr) 2015-01-02
FR2969434A1 (fr) 2012-06-22

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