EP2525519B1 - Procédé de synchronisation temporelle de brouilleurs - Google Patents

Procédé de synchronisation temporelle de brouilleurs Download PDF

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Publication number
EP2525519B1
EP2525519B1 EP20120002958 EP12002958A EP2525519B1 EP 2525519 B1 EP2525519 B1 EP 2525519B1 EP 20120002958 EP20120002958 EP 20120002958 EP 12002958 A EP12002958 A EP 12002958A EP 2525519 B1 EP2525519 B1 EP 2525519B1
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EP
European Patent Office
Prior art keywords
synchronization
interference
synchronization signal
phase
duration
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Application number
EP20120002958
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German (de)
English (en)
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EP2525519A1 (fr
Inventor
Jan Dr. Mietzner
Patrick Nickel
Askold Dr. Meusling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Defence and Space GmbH
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EADS Deutschland GmbH
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Publication of EP2525519A1 publication Critical patent/EP2525519A1/fr
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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
    • H04K3/45—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
    • H04K2203/30—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 for time synchronization of jamming devices according to the features of patent claim 1.
  • radio signal jammers make it difficult or impossible to properly receive radio messages.
  • the jammer like the transmitter to be disturbed, emits energy in the form of electromagnetic waves and superimposes all or part of the original waves. It can operate at the same center frequency as the failed receiver or at an adjacent center frequency.
  • the field strength, the modulation of the interfering signal and the disturbed message are important.
  • Reactive interference systems first check the received frequency spectrum for potentially dangerous signals and then send targeted interference signals to prevent the detected communications. The cycles between observation and evaluation of the spectrum until the emission of the corresponding interference signals are relatively short.
  • Reactive interference systems are used, inter alia, in mobile vehicles for convoy protection against radio-controlled detonators. If several reactive interference systems travel within a convoy, then the lookthrough (LT) phases, ie the phases in which the interference systems scan a given frequency spectrum for potentially dangerous signals, have to be synchronized in time with the individual interference systems (see, for example, US Pat US 2009/0611759 A1 ). Otherwise, the interference systems would respond to the emitted interference signals of the other interference systems, instead of concentrating their resources on actual threat signals (so-called ring-around effect).
  • the object of the invention is to specify a method for the synchronization of a plurality of reactive interference systems combined in a convoy.
  • the method according to the invention serves to synchronize in time two or more mobile reactive radio interference systems for the protection of convoys or individual vehicles against radio-controlled bombs.
  • a reactive interference system regularly broadband scans the frequency spectrum - during the LT phases - to detect potential threat signals.
  • a spectral analysis of the frequency band of interest is performed.
  • the interference system then reacts with corresponding interference signals in order to prevent the possible triggering of a radio-controlled bomb in the vicinity of the convoy or individual vehicle to be protected.
  • a convoy - a temporal synchronization is essential. Otherwise, a ring-around effect occurs in which the individual jamming systems respond to the jamming signals of the other jamming systems instead of concentrating their resources on actual threat signals (since they detect the jamming signals of the other jammers during their LT phases). To avoid the ring-around effect, all participating cooperative reactive interferers can use the same duration of an LT phase or the same duration of an interference phase.
  • the deployment scenario in which several mobile jamming systems move within a convoy to be protected is in Fig. 1 to see.
  • the convoy for example, consists of a plurality of vehicles F, some vehicles are equipped with a reactive interferer S.
  • the interferers S themselves comprise several transmission and receiving means for transmitting interfering signals or for scanning the received frequency spectrum.
  • the method according to the invention uses the LT phases as well as the spectral analysis in the reception branches of the reactive interference systems.
  • the basis here is a synchronization signal, which is expediently within the scan bandwidths of all interfering systems involved.
  • this synchronization signal is sent from a cooperating reactive jammer selected as a pilot transmitter or a separate transmitter.
  • a separate transmitter here means a transmitter which is either outside the convoy or inside the convoy, but without disturbance tasks.
  • the first activation of the pilot transmitter that is, the transmission of the first synchronization signal, takes place at a fixed, known frequency f a and signals in each case the beginning of a new synchronization cycle.
  • the normal operative operation of the reactive interference systems is characterized by the continuous change between LT phases (plus calculation phases) and interference phases (s. Fig. 2a ).
  • the participating reactive interference systems briefly change into a special synchronization cycle (see FIG. Fig. 2b ), which are several consecutive contains the following LT phases (without time gaps, ie the calculation phases must be processed parallel to the LT phases).
  • the normal fault operation is therefore only temporarily interrupted.
  • the second activation of the pilot transmitter also takes place at a fixed, known frequency f b and serves for the actual time synchronization of the individual reactive interference systems.
  • the reactive interferers involved observe the spectral power level of the pilot carrier during the successive LT phases and, based thereon, estimate the exact timing position t 0 of the turn-on edge of the second synchronization signal. This then serves as an anchor point for the nominal temporal grid of LT / calculation phases and interference phases. Finally, all reactive interference systems synchronize themselves to this grid by adjusting the length of the next interference phase accordingly.
  • the proposed sequence of temporal synchronization is in Fig. 3 shown schematically.
  • the first and second synchronization signals may either originate from a separate source or be provided by one of the participating reactive interferers.
  • the number of LT phases within a synchronization cycle can either be fixed or parameterizable.
  • synchronization cycles For the execution of the individual synchronization cycles, for example, a fixed flowchart can be used which depends on the expected temporal drift of the participating reactive interferers. Alternatively, synchronization cycles may also be started as needed, provided there is a suitable control mechanism that monitors the timing of all reactive interferers.
  • a plurality of synchronization cycles can be performed in quick succession, so that also those reactive
  • Synchronize interferers that could not detect the start signal of the first synchronization cycle - either because of destructive propagation conditions or due to an unfavorable position of the LT phase.
  • the number of short consecutive synchronization cycles can be parametrizable or dynamically controlled.
  • the frequency f b of the second synchronization signal used in the second activation of the pilot transmitter may be either equal to or different from the frequency f a of the first synchronization signal.
  • the latter variant allows the participating reactive interferers to distinguish the start signal for a new synchronization cycle from the actual synchronization signal.
  • the period of time T 1 during which the first synchronization signal is transmitted at the frequency f a can be chosen so that the participating reactive interferers can detect it with an arbitrary temporal position of its LT phase. In this case, T 1 depends on the type of interference used.
  • the delay .DELTA.T at which the second synchronization signal is transmitted on the frequency f.sub.b after the end of the first synchronization signal can be tuned to the total length of the LT phases used in the synchronization cycle. It can thereby be ensured that each of the reactive interferers involved can detect the switch-on edge within its successive LT phases.
  • the first and second synchronization signal referred to below synonymously as a pilot signal, provided by one of the participating reactive interferers. That is, at the beginning of the mission, a disturber in the convoy is declared as a so-called 'master' disturber.
  • a method which is particularly easy to implement is selected.
  • the pilot signal of the master interferer is based on the same internal signal generator that is also used to generate the interfering signals ('Exciter'). This allows one particularly low-cost implementation of the method according to the invention for switching from interference mode to a synchronization mode.
  • the master interferer reserves one of its exciter for the pilot signal ('pilot exciter'). This is then no longer available for the reactive interference mode (due to the fixed frequency f a ).
  • the master interferer activates the pilot signal, ie the first synchronization signal is sent for a complete interference phase (ie in this case T 1 corresponds to the used disturbance duration, cf. Fig. 3 ).
  • the pilot signal (second synchronization signal) for the actual synchronization is then sent (ie .DELTA.T corresponds to the sum of LT and calculation duration).
  • the slave interferers use the same signal processing that is also used to analyze potential threat signals. Similar to the master interferer, this allows a particularly low-cost implementation of the synchronization mechanism.
  • a corresponding digital signal processing chain is in Fig. 4 shown. It typically includes essentially the blocks of 'digital filtering', 'fenestration' and 'spectral analysis' (based on Fast Fourier Transform (FFT), for example).
  • FFT Fast Fourier Transform
  • the slave interferers observe the spectrum of the second pilot signal emitted by the master interferer and estimate its starting time t 0 on the basis of the spectral power level (magnitude square of the calculated FFT spectrum). For this purpose, they first determine in which of the successive LT phases the switch-on edge of the pilot signal is located (cf. Fig. 3 ). This can be achieved, for example, by finding a series of three successive LT phases in which the pilot signal is initially absent (first LT phase), having a medium power level in the second LT phase, and in the third LT Phase has a maximum power level. The switch-on edge is then in the middle LT phase. On the basis of the exact spectral power level in the middle LT phase, the exact position of the switch-on edge is then estimated. This exploits the fact that the greater the active part of the pilot signal during the LT phase, the greater the spectral power level.
  • the exact characteristic curve for the relationship between the spectral power level and the time component of the active pilot signal depends strongly on the window function used and the pilot frequency used. This characteristic can be recorded, for example, in the implementation stage of the synchronization method according to the invention.
  • the estimation of the start time t 0 can then be based on a simple comparison of the observed power level versus the characteristic, which means a very low implementation effort.
  • the time synchronization with the master interferer takes place as described.
  • the master interferer (as well as the other interferers) each have several exciters available for interfering with target signals.
  • the synchronization method according to the invention is tailored to the boundary conditions in a composite of reactive interferers.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Noise Elimination (AREA)

Claims (9)

  1. Procédé de synchronisation dans le temps de plusieurs émetteurs de brouillage réactifs coopérants en vue de brouiller un ou plusieurs signaux cibles, caractérisé en ce que
    en vue de réaliser la synchronisation dans le temps, un ou plusieurs émetteurs de brouillage sont permutés d'un mode de brouillage en un mode de synchronisation, le mode de brouillage d'un émetteur de brouillage comprenant une suite continue de cycles de brouillage avec une trame temporelle prédéfinie, chaque cycle de brouillage comprenant une phase d'examen (LT) pour détecter un ou plusieurs signaux cibles, une phase de calcul pour calculer les signaux de brouillage correspondants et une phase de brouillage pour émettre les signaux de brouillage,
    la permutation en le mode de synchronisation s'effectuant par les étapes suivantes :
    - envoi d'un premier signal de synchronisation ayant une durée T1 et une fréquence fa pouvant être prédéfinie,
    - dans le cas d'une détection du signal de synchronisation dans la phase LT, les émetteurs de brouillage réactifs coopérants permutent dans un cycle de synchronisation, le cycle de synchronisation comprenant une suite d'un nombre pouvant être prédéfini de phases LT successives,
    - envoi d'un deuxième signal de synchronisation ayant une durée T2 et une fréquence fb pouvant être prédéfinie,
    - les émetteurs de brouillage réactifs coopérants estiment la position dans le temps t0 de l'instant de mise en circuit du deuxième signal de synchronisation en évaluant le niveau de puissance spectrale du deuxième signal de synchronisation mesuré dans une ou plusieurs phases LT successives,
    - les émetteurs de brouillage réactifs coopérants se synchronisent, la position dans le temps t0 étant utilisée comme point de référence commun pour la trame temporelle du cycle de brouillage.
  2. Procédé selon la revendication 1, caractérisé en ce que le premier et le deuxième signal de synchronisation sont envoyés par un émetteur de brouillage réactif coopérant choisi en tant qu'émetteur pilote ou par un émetteur distinct.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que la fréquence fa du premier signal de synchronisation est égale ou différente de la fréquence fb du deuxième signal de synchronisation.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que le deuxième signal de synchronisation est envoyé avec un retard ΔT après l'instant de mise hors circuit du premier signal de synchronisation.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que la durée T1 du premier signal de synchronisation est égale ou supérieure à la durée d'un cycle de brouillage.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que la durée de la phase LT ainsi que la durée de la phase de brouillage sont identiques pour tous les émetteurs de brouillage coopérants.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que le premier et le deuxième signal de synchronisation se trouvent à l'intérieur d'une plage de fréquences détectable pendant les phases d'examen des systèmes de brouillage participants.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que plusieurs cycles de synchronisation peuvent être exécutés à brefs intervalles les uns après les autres.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que plusieurs cycles de synchronisation sont exécutés les uns après les autres ou en ce que les cycles de synchronisation sont exécutés suivant le besoin.
EP20120002958 2011-05-17 2012-04-27 Procédé de synchronisation temporelle de brouilleurs Active EP2525519B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110101712 DE102011101712B4 (de) 2011-05-17 2011-05-17 Verfahren zur zeitlichen Synchronisation von mehreren kooperierenden reaktiven Störsendern

Publications (2)

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EP2525519A1 EP2525519A1 (fr) 2012-11-21
EP2525519B1 true EP2525519B1 (fr) 2013-08-28

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EP20120002958 Active EP2525519B1 (fr) 2011-05-17 2012-04-27 Procédé de synchronisation temporelle de brouilleurs

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EP (1) EP2525519B1 (fr)
DE (1) DE102011101712B4 (fr)
DK (1) DK2525519T3 (fr)
ES (1) ES2433674T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012006228B3 (de) 2012-03-24 2013-06-20 Eads Deutschland Gmbh Verfahren zum Selbsttest eines reaktiven Funkstörers
GB2585886B (en) * 2019-07-19 2023-10-18 Kirintec Ltd A signal generator
CN113938228B (zh) * 2021-12-16 2022-03-01 天津七一二通信广播股份有限公司 网络域协作干扰位置检测方法及系统

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Publication number Priority date Publication date Assignee Title
DE977897C (fr) * 1962-07-31
AU2002341369A1 (en) * 2001-10-16 2003-04-28 Ron Yaacov Davidson Method and apparatus for signal detection and jamming
US7095779B2 (en) 2004-08-06 2006-08-22 Networkfab Corporation Method and apparatus for automatic jammer frequency control of surgical reactive jammers
US7532856B2 (en) * 2006-03-24 2009-05-12 Robert Eugene Stoddard Regenerative jammer with multiple jamming algorithms
DE102008038315A1 (de) 2008-07-14 2010-01-28 Industrieanlagen-Betriebsgesellschaft Mbh Störvorrichtung und Verfahren zum Stören eines Zielsignals

Also Published As

Publication number Publication date
DE102011101712B4 (de) 2012-07-19
EP2525519A1 (fr) 2012-11-21
ES2433674T3 (es) 2013-12-12
DK2525519T3 (da) 2013-11-25
DE102011101712A1 (de) 2011-10-20

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