MOBILE GROUND RADIO JAMMING SYSTEM «LIMAN»

The modern concept of the operations management conducts the significant role to the radio reconnaissance, communication and control systems of armies and application of the High Accuracy Weapon (HAW). The high efficiency of modern arms provides the defeat of the majority of the ground and air targets in the first air operation. The blocking of the information channels of the enemy air control by the means of radio countermeasure is an effective counteraction for it. The mobile ground system “Liman” intends for the radio countermeasure of the radio communication and control links. The distinctive feature of the system is the effective radio countermeasure of the modern jam proof radio channels using Frequency Hopping (FH) mode and FH in a combination with spread spectrum radio signal (FHSS). It is reached due to high speed radio reconnaissance means of the system, application of original correlation methods of the noise like radio signals detection, high energy potential of the jamming signal.


PRODUCT OVERVIEWThe modern concept of the operations management conductsthe significant role to the radio reconnaissance, communicationand control systems of armies and application of the High AccuracyWeapon (HAW). The high efficiency of modern arms providesthe defeat of the majority of the ground and air targets in the firstair operation.The blocking of the information channels of the enemy air controlby the means of radio countermeasure is an effective counteractionfor it.The mobile ground system “Liman” intends for the radio countermeasureof the radio communication and control links.The distinctive feature of the system is the effective radio countermeasureof the modern jam proof radio channels using FrequencyHopping (FH) mode and FH in a combination with spreadspectrum radio signal (FHSS). It is reached due to high speed radioreconnaissance means of the system, application of originalcorrelation methods of the noise like radio signals detection, highenergy potential of the jamming signal.

 

The objects of the system “Liman” radio countermeasure are:

  • all kinds of the VHF and UHF radio communications and guidance channels in the frequency ranges 100-400 MHz used forthe interaction of crews during air operation; for guidance of the aircrafts on air and ground targets by the air and groundcontrol stations; for transmission of a reconnaissance data from the aircraft to the control station; for guidance of the aircraftson ground targets by the forward air controller (FAC);
  • the communication, control and navigation channels in the frequency range 960-1215 MHz (JTIDS, TACAN types).

The system “Liman” authentically finds out the radio channel signals of the air control station on a distance up to 450 km. Afterthis, onboard radio means – the receivers of the information and commands – reliably suppressed on distances up to 200 km withradiation of powerful jamming in the frequency ranges 100-400 MHz and 960-1215 MHz.The creation of the high energy potential jamming signal based on technology of the phased array providing the value near10 kW in a low and 60 kW in a high frequency bands, that in tens times exceeds the energy potential of the analogous jammingstations.The energy potential of the system “Liman” jamming station provides the radio countermeasure for the control channels ondistances when the attack aircraft cannot independently to detect and strike the targets that provides significant decrease in efficiencyof the enemy air activities.

 

The system “Liman” structure includes three types of the stations

  • control station – the product “Liman-ПУ” – 1 unit;
  • jammer of the band 100-400 MHz – the product “Liman-П1”;
  • jammer of the band 960-1215 MHz – the product “Liman-П2”.

The control station intends for the analysis and processing of the reconnaissance information received from jammers, effectivedistribution of the total resource of the jammers over suppressed radio links, automated calculation of the current overall efficiencyof the system, synchronization of operational modes of the jammers, communication with superior command post.The jamming station (jammer) of the band 100-400 MHz intend for the radio reconnaissance and jamming of the voice radiolinks and data transmission links with amplitude and frequency modulation operating on fixed operating frequencies (FOF), andusing Frequency Hopping (FH).The jammer of the range 960-1215 MHz intends for the radio reconnaissance and jamming of the links, using noise-like radiosignals and Frequency Hopping with Spread Spectrum radio signals (FHSS).The communication of the control station with jammers is carried out by the radio channel on distances up to 10 kms, or by thecable channel on the distances up to 5 kms.

 

Basic Performance of the System

1 Operating frequency bands for:

  • “Liman-П1” 100-400 MHz;“
  • Liman-П2” 960-1215 MHz.

2 Jamming objects:

  • in the frequency band 100-400 MHz – all kinds of the VHF and UHF radio communications and guidance channels used forthe interaction of crews during air operation; for guidance of the aircrafts on air and ground targets by the air and groundcontrol stations; for transmission of a reconnaissance data from the aircraft to the control station; for guidance of the aircraftson ground targets by the forward air controller (FAC);
  • in the frequency band 960-1215 MHz – the communication, control and navigation channels (JTIDS, TACAN types)

3 Kinds of jamming signals:

  • jamming for the radio links with fixed operating frequencies  on time and frequency;(FOF) mode over the frequency bands 100-400 MHz spot jamming signal
  • jamming for the radio links over the frequency band  on time and frequency;100-400 MHz using FH mode with minimal duration ofradiation on one frequency more than 13 ms spot jamming signal
  • jamming for the radio links over the frequency band in frequency band;100-400 MHz using FH mode with minimal duration of radiationon one frequency less than 13 ms barrage jamming signal 
  • jamming for the radio links over the range 960-1215 MHz in frequency bandusing FHSS mode. barrage jamming signal 

4 Single jammer energy potential:

  • “Liman-П1” up to 10 kW
  • “Liman-П2” up to 60 kW

5 Range of jamming area up to 200 kms

6 Range of the air control station (ACS) and long radar  kmsdetection (LRD) transmitters finding up to 450

 

7 The automatic analysis and determination of radio signals parameters, classification of radio emissions and selection of jamming objects, choice of kind and parameters of jamming signals, jamming signals forming for radio networks with FOF and FHSS.

8 Jamming signal radiation by means of transmitting phased array (PA) with automatic compensation of the nonidentical phase of amplifiers over the frequency bands 100-400 MHz and 960-1215 MHz

9 Electronic scanning of the transmitting PA antenna patterns maximum over the frequency bands 100-400 MHz and 960-1215 MHz in directions of horizontal plane  –30 degree +30 degrees

 

10 Response time of the system:

  • at jamming for the radio links with FH mode, no more 0.3 ms;
  • at jamming for the radio links with FOF mode, no more 0.5 s

11 Maximum quantity of jammers (“Liman-П1” and “Liman П2”) in the system structure (each station type quantity in one system can be defined on demand of the Customer) 12

12 Possibility of independent operation of the jammers “Liman П1” and “Liman П2”  Present

SOME HISTORY FACTS





10,000

Tonnes of iron
Shot at Siege of Sebastopol during Crimean War





144,000

Revolutions per minute
Does a bullet fired from Lee Enfield rifle, as used in both world wars





2,000

Women
The Nizam of Hyderabad raised in 1975 for his war against the Marathas





130,000

Meters
Is an effective range of Big Bertha, the World War I howitzer


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State Foreign Trade Enterprise “SpetsTechnoExport” is a fully state-run entity incorporated by the Government of Ukraine in 1998 for export-import activities at foreign armaments markets.

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