Classifications

• • 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
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
  • H04K2203/00—Jamming of communication; Countermeasures
  • H04K2203/10—Jamming or countermeasure used for a particular application
  • H04K2203/22—Jamming or countermeasure used for a particular application for communication related to vehicles
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
  • H04K2203/00—Jamming of communication; Countermeasures
  • H04K2203/10—Jamming or countermeasure used for a particular application
  • H04K2203/24—Jamming or countermeasure used for a particular application for communication related to weapons
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
  • H04K3/00—Jamming of communication; Counter-measures
  • H04K3/80—Jamming or countermeasure characterized by its function
  • H04K3/92—Jamming or countermeasure characterized by its function related to allowing or preventing remote control

Definitions

• RCIEDs remote controlled jmprovised explosive devices
• ESS Electronic Support Measures
• Such reconnaissance systems typically include components for modulation type detection, bearing, and, depending on the operational requirement, e.g. also for demodulation and development of the signal content.
• the RF interference power radiated by the jammer to protect the vehicle or convoy causes an overload or saturation in the receiving channels of the reconnaissance system and thus makes it useless. Therefore, the reconnaissance mode of the jammer and thus the most consistently desired protection function must be turned off.
• reactive jammers (English: Responsive Jammer) are known. These are jammers that only perform a fault when they have detected a signal to be disturbed. In order to detect such signals, reactive jammers work with an observation phase connected between two interference phases. During the observation phases, only the signal environment is observed and evaluated, but no interference signal is transmitted. In the following interference phase, RF power is actively radiated only on frequencies that have an occupancy. The observation phase of the reactive jammer is so short that targets (eg bombs) can not trigger during this time.
• targets eg bombs
• US2006 / 0153280 A1 likewise describes a reactive jamming transmitter which, however, can additionally determine the direction of a signal received in the observation phase. This direction is taken into account in the subsequent disturbing phase, in particular in that the interference signal is emitted only in the corresponding direction.
• Embodiments and a reconnaissance system for use in the method according to the invention are the subject of further claims.
• the operation of reactive jammer and reconnaissance system is synchronized such that signal reception of the reconnaissance system occurs only within the observation phases of the reactive jammer. This ensures that the reconnaissance system is not disturbed by the interference radiation. Thus, a high-quality setup operation becomes possible even when the protection function against RCIEDs (executed by the jammer) is activated.
• At least one of the following functions is performed: - Bearing,
• a reaction of the reconnaissance system to the perturbation cycle of the reactive jammer is possible.
• a dynamic adaptation of the system synchronization can take place in such a way that the length of the observation phases and / or the interference phases of the reactive interference transmitter is controlled as a function of the operational requirements of the reconnaissance system.
• both the efficiency of disturbance and the depth of explanation can be controlled in a targeted manner.
• the reconnaissance system For example, for more complex functions of the reconnaissance system, such as e.g. Unlocking the signal content, the reconnaissance system a longer
• the direction information obtained by the reconnaissance system can be used for direction-selective disruption with a multi-antenna system.
• the generation of the directional signal can be realized either by appropriate beam shaping in phased array antennas or by antenna switching in the case of multiple directional antennas.
• reactive jammer and reconnaissance system are not generally operated in combination, can be provided in a further embodiment, that the reconnaissance system automatically synchronized to the set in the reactive jammer temporal position of the observation phase as soon as the two units in contact with each other in operational use.
• Reactive jammer and reconnaissance system can be used in particular for the protection of vehicles or vehicle convoys.
• the reconnaissance system and reactive jammer may be located on the same vehicle or different vehicles depending on operational requirements. The invention will be explained in more detail with reference to figures. Show it:
• Fig. 1 is a diagram for synchronizing the operation of reactive jammer and reconnaissance system
• Figure 2 is a schematic representation of the overall configuration of reactive jammer and on clarification system.
• FIG. 3 is a circuit diagram of details of the protection circuit of FIG. 2.
• Fig. 1 shows a representation of the timing of the individual process steps within the reactive jammer and the reconnaissance system.
• the function "bearing" is considered for the reconnaissance system.
• the reconnaissance system may have additional functions, e.g. Modulation type detection, be provided.
• the internal procedure of the jammer is the upper view of FIG. 1, the internal procedure for the direction finder is shown in the lower illustration of FIG.
• Time duration T J2 emission of an interference signal with the frequency f_old.
• Time T L T Signal recording to detect potential threats.
• Time duration The signal received during T LT is subjected to an FFT to obtain spectrum information and to determine therefrom the required new interference frequency f_new. Subsequently, the determination of the new interference signal with the frequency f_neu. Duration T J2 : Transmission of the new interference signal with the frequency f_new.
• T L T and Tj! together form the observation phase T B
• the observation phase T B can be adjusted by lengthening T L T.
• the cycle time between successive observation phases T B can be adjusted by shortening the disturbance phase T J2 and / or omitting the time duration Tji.
• the disturbance phase T J2 can be extended.
• the observation phase TB can be shortened to the time T LT and the interference phase can be lengthened accordingly, in which an interference signal is also transmitted in the time period Tji.
• the interference efficiency ⁇ y of the jammer is as follows:
• the direction finder is as follows: It carried out there in parallel to the activities of the jammer, the following processing steps:
• the operation of reconnaissance system and reactive jammer is synchronized such that the signal pickup of the direction finder takes place only within the observation time TB of the reactive jammer, and never during the jamming phase T J2 , during which the jammer emits spurious energy.
• the synchronization can be done, for example, with a synchronization line (eg copper or glass fiber) or via an air interface.
• the air interface has the advantage that several vehicles can work in parallel.
• the duration of the individual work phases can be freely selected by the reactive interferer and the reconnaissance system.
• the signal pickup from the jammer and direction finder (as can be seen in the example of FIG. 1) begin or end at the same time.
• Fig. 2 shows a schematic representation of the overall configuration of reactive jammer 1 and reconnaissance system 2.
• the jammer 1 includes the jammer module ECM and the associated antenna A-ECM for emitting the interference signal and for receiving signals.
• Reconnaissance system 2 comprises the reconnaissance module ESM and the associated antenna A-ESM for receiving signals.
• the two systems 1 and 2 are, as described in detail above, synchronized with respect to the signal recording of the reconnaissance system 2.
• the synchronization can be done via a cable connection as shown. This is especially preferred when the two systems 1, 2 are located on the same vehicle. Alternatively, a wireless connection may also be provided, in particular if the two systems 1, 2 are located on different vehicles or platforms.
• Fig. 3 shows the structure of the antenna protection device P of Fig. 2 in detail. It is characterized in particular by speed in the switching open / closed and by a high insulation in the open state.
• the coarse protection GS is intended to derive the essential part of the inflowing energy and may be e.g. consist of a gas gap.
• the remaining voltage is applied to a fast switch SSC (e.g., a relay, a PIN diode, or even a MEMS switch) which turns off the antenna.
• a limiter LT is provided, e.g. consists of diodes.

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=45560607

Family Applications (1)

Country Status (6)

Cited By (2)

Citations (2)

Family Cites Families (3)

• 2010
  • 2010-12-24 DE DE102010056268A patent/DE102010056268A1/de not_active Withdrawn
• 2011
  • 2011-12-21 EP EP11815612.4A patent/EP2656528B1/de active Active
  • 2011-12-21 WO PCT/DE2011/002165 patent/WO2012095080A1/de active Application Filing
  • 2011-12-21 ES ES11815612.4T patent/ES2672394T3/es active Active
  • 2011-12-21 KR KR1020137012520A patent/KR101918576B1/ko active IP Right Grant
• 2013
  • 2013-05-16 IL IL226406A patent/IL226406A/en active IP Right Grant

Patent Citations (2)

Also Published As

Similar Documents

Legal Events