EP1303069B1 - System for the generation of jamming signals - Google Patents

System for the generation of jamming signals Download PDF

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Publication number
EP1303069B1
EP1303069B1 EP02292481A EP02292481A EP1303069B1 EP 1303069 B1 EP1303069 B1 EP 1303069B1 EP 02292481 A EP02292481 A EP 02292481A EP 02292481 A EP02292481 A EP 02292481A EP 1303069 B1 EP1303069 B1 EP 1303069B1
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EP
European Patent Office
Prior art keywords
station
frequency
chirp
evf
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP02292481A
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German (de)
English (en)
French (fr)
Other versions
EP1303069A1 (fr
EP1303069A9 (fr
Inventor
Daniel Thales Intellectuel Property Brunet
Frédéric Thales Intellectuel Property Garreau
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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
    • H04K3/20—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
    • H04K3/20—Countermeasures against jamming
    • H04K3/22—Countermeasures against jamming including jamming detection and monitoring
    • H04K3/224—Countermeasures against jamming including jamming detection and monitoring with countermeasures at transmission and/or reception of the jammed signal, e.g. stopping operation of transmitter or receiver, nulling or enhancing transmitted power in direction of or at frequency of jammer
    • H04K3/226—Selection of non-jammed channel for communication
    • 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
    • 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 the field of communications where certain posts must be in connection with posts known as “friends” and be inaccessible for posts called “enemies”.
  • the prior art discloses various methods and devices of interfering signal generation, designed to effectively combat fast frequency evasion stations or EVFs (in English terms) Hopping Frequency), for example, greater than 100 jumps per second, while providing protected sub-bands for communications say "friends".
  • Subband generation allows more focus the scrambling signal and gain in efficiency.
  • Figures 1 and 2 show the generation of a signal according to the art and Figures 3 and 4 an example of an architecture of a system.
  • FIG. 1 shows a scrambling signal in a diagram, frequency, f, abscissa axis - amplitude, A, (energy emitted in a frequency band), ordinate axis.
  • This signal is broadband and includes scrambled frequency ranges, F B , said useful subbands, non-scrambled ranges, F NB , said protected subbands, which separate the useful subbands.
  • This scrambling signal can be summarized as a sum of lines in the subbands to be scrambled as shown in Figure 2.
  • FIG. 3 shows an example of an existing architecture according to the prior art of a CHIRP card adapted to generate a scrambling signal.
  • the scrambling signal is digitally generated by a DSP processor (Digital Signal Processing) and is stored in a "RAM burst". This memory can contain a maximum of 10 different interfering signals.
  • DSP processor Digital Signal Processing
  • RAM burst This memory can contain a maximum of 10 different interfering signals.
  • one of the ten scrambling waveforms stored in the RAM burst is read in loop and the samples are sent by the NAC to a scrambling signal transmission set (no represented for the sake of clarity).
  • the DSP can not access RAM burst memory. Conversely, when the DSP accesses this memory, no scrambling signal can be generated.
  • FIG. 4 represents the block diagram of a system corresponding to the map of FIG. 3 comprising an EVF station 1 equipped with an antenna 2, the station is connected to a device 3 or jammer to which it provides the frequency law.
  • the jammer is provided with a chirp card 4 adapted to generate a low power interference signal Sb, for example, which is transmitted to a power amplifier 5 in order to produce a high power interference signal S B at the antenna 7.
  • the chirp card 4 is connected to the EVF station via a control BUS of the amplifier and radio protections and a decoupling device 6 whose particular function is to isolate the antenna 2 , radio protection for the EVF station.
  • FR-A-2,573,216 describes a device comprising several transmitters / receivers and in which several service frequencies are used constantly.
  • the device comprises in the transmitter a switch, programmed in advance or remotely controlled from a station central station, which makes it possible to transmit jamming signals during breaks frequency conversation.
  • the subject of the present invention relates in particular to a system where the jammer is synchronized with a friendly station, temporally and / or frequencially.
  • Another object is to provide a system with a capacity of memory more important for the frequency laws used than the one systems of the prior art.
  • the subject of the invention relates to a device for generating interference signals comprising at least one jammer adapted to generate at least one jamming signal, several EVF stations communicating with each other within the same network, characterized in that the jammer is provided of a chirp map to generate scrambling signals and data from control to an EVF station, the chirp board having an interface of communication to connect a friend EVF station to the chirp board so to ensure synchronization between the two.
  • the friend station is for example synchronized in frequency and / or in time with the jammer.
  • It comprises for example a radio protection device arranged between the EVF and its antenna and connected to the jammer.
  • the scrambler may include a processor to determine the interference signals with protected subband.
  • the jammer is for example provided with a memory storing waveforms of scrambling signals and a communication interface.
  • the communication interface may be a serial link.
  • Information exchanged between the EVF station and the chirp card are, for example, the frequency parameters derived from the frequency law, synchronization parameters in time and frequency and control transceiver.
  • Figure 5 considers a distribution with 3 EVF positions in the same network, that is to say in a set constituted by several sub-bands frequency and several encryption keys, this being known from the skilled person.
  • 3 posts one is considered to be the master of the network, the post N ° 1, the others are considered as slaves, the Post No. 2 and Post No. 3.
  • the master position serves as a time reference for all slave posts and plays a major role in the operation of the cooperative interference object of the present invention.
  • the master station When initializing the network, the master station issues a particular sequence in order to synchronize in frequency and time, the slave stations. After synchronization, the positions are capable of communicate between them.
  • FIG. 5 represents different sequences Fi, (F 1 , .... F 9 , ..) transmitted by the master station N ° 1 and by the slave stations N ° 2 and N ° 3 in a reception state, which is synchronize respectively on the sequences F 4 and F 5 .
  • the 3 stations are synchronized, in time and in frequency and have the possibility of communicating with each other.
  • each position of the network will pass into a slower jump law because the accuracy of the internal clock of the posts does not allow to keep a synchronization precise time if the master does not emit from time to time.
  • Each post of the network will keep its own time base that drifts slowly through report to the time base of the master position.
  • Figure 6 shows the desynchronization of an EVF network, a issue of the post No. 3 and a program of the master position allowing the resynchronization of the set, which appears as a parameter important in the cooperative scrambling phase. Indeed, it is the post master of the network connected to the jammer that gives the absolute time base. At the system level, the jammer will have to make stops of scrambling and force the master station to transmit to re-synchronize the network.
  • the time diagrams in this figure 6 represent, from the top down to the figure and for each post, the law of internal jump to the post, the law of slow jump in "listens" for the resynchronization, the emission-reception of the post.
  • the references t 1-2 and t 1-3 correspond respectively to the advance time of station 2 on the master and station 3 on the master.
  • the point T 1-2 corresponds to the time registration of items No. 1 and No. 2 on the basis of time of item No. 3, only during the transmission phase of item No. 3.
  • the positions N ° 1 and N ° 2 resynchronize their time base on the time base of the master position.
  • Figure 7 shows the interaction at system level between the jammer and the station EVF master of the network to protect.
  • Time axes are the temporal sequences for the control of the EVF master station, for the control of the antenna protection of the EVF station, and the lower axis for jamming.
  • the operator selects, for example, the beginning of the cooperative scrambling, P 1 , then the scrambler operating software performs the start of synchronization of the EVF network, P 2 , P 3 corresponds to the maintenance of the master station in transmission to maintain the law of fast jump (the station emits "in the vacuum” since during the jamming it is disconnected from the antenna and put in charge), a new sync law is launched, P 4 , and the jamming is stopped for example by the operator at the end of the period P 5 .
  • the antenna is in an indifferent state, A 1 , there is then transmission on the antenna, A 2 , A 3 then corresponds to the scrambling phase with an emission put on charge, A 4 a transmission period on antenna, A 5 to a new scrambling phase corresponding for example to a new synchro launched and A 6 return to an indifferent state of the antenna, after the stop scrambling initiated by the operator.
  • the scrambling sequences B 1 , B 2 correspond, for example, to the calculation periods of the CHIRP and to a cooperative synchronization, B 3 to the cooperative scrambling, B 4 to the cooperative synchronization, B 5 to a new cooperative scrambling period.
  • the cooperative scramble period is the time maximum allowed between two resynchronization plans of the EVF network. This time depends on the stability of the clock of the stations used, the time it takes two positions to get out of sync half a step. Beyond that, the The method considers that the signal is completely scrambled.
  • the EVF station "emits" in a vacuum since during jamming it is disconnected from the antenna and put on charge.
  • Co-operative interference corresponds to the maximum allowed time between two phases of resynchronization of the EVF network. This time depends on the stability of the clock used, which is the time it takes for two positions to desynchronize by half a step. Beyond, the signal is considered as being completely scrambled.
  • the principle of the device object of the invention or "cooperative chirp" is to be able to communicate a "friend" EVF station in the middle of the scrambling signal. To do this, it is necessary to transmit to the scrambler the frequency hopping law of the network to be protected in order to generate a protected subband during the duration of a plateau.
  • FIG. 8 represents in a time-frequency diagram the co-operative scrambling principle which is applicable for example in the deployment of a projected force.
  • T- stage parameters are considered which correspond to the duration of a transmission stage at a given frequency and T inter to the duration of the GAP separating two stages.
  • the station EVF friend emits in a protected subband F 1 , F 2 , F 3 , F 4 .
  • the frequency corresponds to F 1 .
  • the chirp will determine, by fetching in the memory (SRMAN or burst RAM) the frequency to be protected for the next level, for the second level the frequency F 2 .
  • the method according to the invention makes it possible to obtain the synchronization between the unit EVF ami and the jammer, in particular so that there is a correspondence between the transmission duration of the jamming signal and the transmission duration of the station EVF.
  • the diagram in the upper part of FIG. 8 shows the distinction of the signals S ami and the interference signals S B.
  • the diagram in the lower part of FIG. 8 shows the superposition of the emitted signals S enemy by an enemy station and the interference signals S B.
  • the enemy enemy emission sub-bands F overlap at least the interference signal transmission subbands F B , in frequency and in time.
  • the so-called "enemy” EVF network is neither synchronized temporally nor frequently with the FVO network friend, it remains scrambled.
  • the set of waveforms is for example obtained by a calculation prior to the operation of the device and stored in a database of data.
  • FIG. 9 gives an exemplary embodiment of a device according to the invention comprising a cooperative chirp. Elements identical to those of Figure 4 have the same references.
  • the device comprises an EVF station 1 equipped with an antenna 2.
  • the EVF station is in connection with a jammer 3 provided with a cooperative chirp card 4 whose particular function is to generate a low-power interference signal Sb, data from FIG. control D to the EVF station and the radio protection 8 arranged between the antenna 2 and the EVF station.
  • the chirp card receives from the EVF station the information I sync for synchronization in frequency and time.
  • the low power interference signal Sb is transmitted to a power amplifier 5 in order to produce the interference signal S B of sufficient power at the jammer antenna 7.
  • the device comprises suitable means, such as a processor, to calculate the protected subband interference signals.
  • suitable means such as a processor, to calculate the protected subband interference signals.
  • the operator After an interception (reception) phase, the operator identifies the bands of frequencies used by friendly and enemy EVF sets. He can thus using the scrambler's operating software program the terminals of EVF bands to scramble, then eventually the terminals of the bands of frequencies to be protected; then he activates the Cooperative Chirp mode (scrambling): the chirp module calculates the threats, or waveforms interference to be transmitted according to the bands to be scrambled and the frequencies to be protect.
  • the frequency information is for example constituted of a train of bits sent by the EVF station representative of the frequency hopping n + 1.
  • FIG. 10 An example of hardware architecture of the CHIRP card is given in Figure 10. It includes in addition to the elements given in Figure 3 a SRAM in particular to memorize a number of curves different, for example up to 78 curves, in addition to the 10 curves stored in the RAM burst. It also includes an interface of communication including the function of connecting an EVF friend to the chirp card, to ensure the time synchronization and frequency between the two.
  • the scrambling signal is digitally generated by the DSP processor, and is stored in the 'RAM burst'.
  • This memory can contain a maximum of 10 different interference signals.
  • no jamming signal can be generated.
  • one of the 10 scrambling waveforms stored in the burst RAM is read in a loop, and the samples are sent to the DAC. during this scrambling phase, the DSP can not access burst memory RAM.
  • the demultiplexer generates a signal at 250 MHz because the memory is only 125 MHz.
  • CNA output converts signals digital to analog (10 bits in this example). Flash EPROM allows to store the program.
  • the program in this 'ROM' will be loaded into the DSP.
  • the role of the EPLD is essentially the one controller, and memory management (read / write permission in the BURST RAM). So during the scrambling phase, the DSP can compute other waveforms that will be stored in the SRAM, the latter having a much higher capacity, 512 kmots of 32 bits. At a change of frequency to be protected, only a data transfer precalculated will take place. Threats with adequate protections will be transmitted during a scrambling stop in the Burst RAM.
  • the interface between the EVF and the cooperative CHIRP is for example in the form of a serial link between the CHIRP module of the jammer exciter receiver and the auxiliary output of the EVF station.
  • this output serves, for example, to transmit the frequency information to a complementary amplifier. This allows in particular to adapt the input of the chirp module to different logical levels frequency information.
  • the synchronization parameters pass through the circuit chirp interface.
  • the transmission / reception command is managed by the module excitatory receiver operation (logic buried in real time by example). This operating module also generates the signals of control of the amplifier and radio protections.
  • the waveform can be generated by different methods.
  • the FIG. 12 represents an example of an algorithm for generating a shape wave.
  • the transmitted signal S 1 is a temporal signal with a duration of 40 ⁇ s, ie approximately 20,000 samples for a sampling frequency of 250 MHz.
  • This signal represents a jump voltage ramp, which is transmitted to the input of a frequency modulator 10.
  • the signal obtained is a time signal (spectrum 1) with a duration of 40 ⁇ s which represents the scrambling signal 5, before the corrections making it possible to obtain higher frequency protections.
  • the signal is transmitted to an FFT, 11, producing a complex frequency signal, 20,000 samples, represented for example in the form of amplitude / phase pairs. This signal represents the scrambling signal before corrections.
  • the signal after correction by means of an appropriate device, 12 corresponds for example to a complex frequency signal of 20,000 samples, for example represented in the form of a pair Amplitude / Phase (spectrum 2).
  • This signal represents the corrected interference signal that is transmitted to an IFFT device (inverse Fourier Transform) in order to obtain the final scrambling signal of 20,000 samples.
  • Figure 13 corresponds to a spectral zoom of the waveform of interference.
  • FIG. 13 in the protective strip, there is a suppression of the F1 + 2000 kHz interference line, in the diagram represented in the upper part.
  • the resulting hole follows the EVF position and we note an evolution in time (represented by the two diagrams located in the lower part of this figure) of the hole that corresponds respectively to the suppression of the interference line F1 + 350 kHz and F1 + 850 kHz.
  • the different lines represented on this figure are spaced at 25 kHz.
  • the principle used is to identify all the possibilities of threat or as many as possible and store them in the SRAM. Knowing these parameters there will only be a switch from a threat to the other.
  • the chirp module performs these calculations.
  • the size of SRAM sizes the total number of threats that one is afraid to pre-calculate.
  • the dynamics in the protections is imposed by the amplification system and imposes a minimum width of hole.
  • the scrambling efficiency is imposed by the amplification system and imposes a minimum width of hole. The scrambling efficiency will be maximum for a protection or hole of minimum width in the signal of interference.
  • Figure 15 shows different waveforms in a amplitude-frequency diagram and their evolution over time.
  • Tables 1 and 2 were obtained for a module chirp with 512K SRAM per 32-bit words.
  • the NAC being on 10 bits, it is possible to optimize data by putting 3 samples word.
  • Threat threat of 12.5 KHz requires 20,000 samples, SRAM can store up to 78 threats.
  • Table 1 gives the calculation time for a threat. piping kHz For a single subband (ms) For 20 sub-bands (ms) 50 51 52 25 103 104 12.5 210 211
  • the waiting time is 16 seconds.
  • Table 2 gives the distribution of protections according to the width of the threat and assuming the two sub-bands protected by curve.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Transmitters (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Noise Elimination (AREA)
EP02292481A 2001-10-09 2002-10-08 System for the generation of jamming signals Expired - Lifetime EP1303069B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0112976A FR2830710B1 (fr) 2001-10-09 2001-10-09 Procede et systeme de brouillage
FR0112976 2001-10-09

Publications (3)

Publication Number Publication Date
EP1303069A1 EP1303069A1 (fr) 2003-04-16
EP1303069A9 EP1303069A9 (fr) 2003-06-25
EP1303069B1 true EP1303069B1 (fr) 2005-12-14

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EP02292481A Expired - Lifetime EP1303069B1 (fr) 2001-10-09 2002-10-08 System for the generation of jamming signals

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EP (1) EP1303069B1 (es)
AT (1) ATE313180T1 (es)
CA (1) CA2406338A1 (es)
DE (1) DE60207960T2 (es)
ES (1) ES2254625T3 (es)
FR (1) FR2830710B1 (es)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2869189B1 (fr) 2004-04-16 2006-06-02 Thales Sa Procede de controle et d'analyse des communications dans un reseau de telephonie
EP1786132A1 (en) * 2005-11-11 2007-05-16 BRITISH TELECOMMUNICATIONS public limited company Method and system for secure communication
FR2983373B1 (fr) 2011-11-24 2013-11-08 Thales Sa Procede de brouillage de communications dans un reseau controle en boucle fermee
FR2999843B1 (fr) 2012-12-19 2018-03-16 Thales Procede de brouillage de communications dans un reseau controle en boucle ouverte
GB2585886B (en) * 2019-07-19 2023-10-18 Kirintec Ltd A signal generator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2737576C1 (de) * 1977-08-22 1986-01-09 Siemens AG, 1000 Berlin und 8000 München Militaerisches Radar- oder Funk-Nachrichtenuebertragungssystem
DE2737577C1 (de) * 1977-08-22 1986-01-09 Siemens AG, 1000 Berlin und 8000 München Militaerisches Radar- oder Funk-Nachrichtenuebertragungssystem
FR2518337A1 (fr) * 1981-12-15 1983-06-17 Thomson Csf Procede d'etablissement des communications dans un reseau de postes emetteurs-recepteurs a sauts de frequence et poste destine a la mise en oeuvre de ce procede

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CA2406338A1 (fr) 2003-04-09
EP1303069A1 (fr) 2003-04-16
FR2830710B1 (fr) 2004-02-27
EP1303069A9 (fr) 2003-06-25
ES2254625T3 (es) 2006-06-16
FR2830710A1 (fr) 2003-04-11
ATE313180T1 (de) 2005-12-15
DE60207960D1 (de) 2006-01-19
DE60207960T2 (de) 2006-08-17

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