Military Communications and Information Technology: A Trusted ...

80 Military Communications and Information Technology...
User interface of the jammer enables to program frequency bands for jamming
and friendly communication. Controller of the counter RCIED jamming
system is responsible for programming a jammer block in a reactive jamming
mode. Jamming decision is taken based on data from tuners. Expected emission
identification parameters:
• emission detection range – several km (depending on the radiated power
of trigger transmitter);
• scan time of frequency range 26 MHz ÷2,6 GHz below 50 ms;
• frequency resolution: better than 25 kHz for VHF and 100 kHz for UHF;
• maximum reaction delay between detected incoming signal and jamming
transmission beginning should be below 100 ms.
VI. Summary
In this paper some aspects which influence on detection and jamming parts
of RCIED countermeasure system was discussed. A conception of a model RCIED
jamming system was proposed to overcome some of the pointed difficulties. Results
from counter RCIED project would be taken into account in newly developed applications
and EW systems created in MCI.
Limitations which arise from specific IED operation and profile of mobile
jamming sets result in a lot of restrictions that have influenced on construction
of C-RCIED devices, detection and jamming methods. Compact size and restricted
power source cause that the device provides a limited area of protection. Mobility
of a vehicle and diversity of possible signals sources cause inability of exploitation
more sophisticated methods for emission detection and identification in order to
provide faster response to possible threat. Placing the receiver near the transmitter
impairs the effectiveness of detection of hostile transmissions.
To improve detection and jamming performance, it is planned creation
a cooperative network of several receivers and jammers placed apart. Such system
allows to mitigate an effect of hiding small signals in interference phenomenon and
noise background and could combat effect of fading, caused by ground reflections.
Transmitters working in a network can attack the same emissions (extend coverage)
or react to different frequencies simultaneously combating multi-frequency triggering.
Receivers which scan in a network can achieve higher probability of detection
(cooperative detection) or faster scanning rate in case of independent scanning
adjacent frequency ranges. Physical separation of receivers from transmitters (one
vehicle perform scanning other jamming) lead to better sensitivity and extend
range of detection. For data transmission between network elements, nonstandard
wireless connections or infrared technology should be used.