Time filter

Source Type

Operations, Belgium

Liolis K.P.,European Space Agency | Liolis K.P.,National Technical University of Athens | Gomez-Vilardebo J.,Catalonia Technology Center of Telecomunications | Casini E.,European Space Agency | And 2 more authors.
IEEE Transactions on Communications

This Letter addresses the statistical modeling of dual-polarized MIMO-LMS fading channels. In the absence of accurate experimental results, a statistical model for the characterization of MIMO-LMS channels is proposed based on consolidation of available experimental results for SISO-LMS and MIMO wireless channels as well as on their extrapolation to the MIMO-LMS case of interest. Moreover, a step-by-step methodology for the simulation and time-series generation of the proposed MIMO-LMS channel model is provided, which is useful for the design and performance assessment of MIMO-LMS transmission systems. The proposed model incorporates the effects of all relevant critical channel aspects in a flexible and fully-parameterized way. © 2006 IEEE. Source

Nicolaescu I.,Military Technical Academy | Coman C.,NATO C3 Agency
2010 8th International Conference on Communications, COMM 2010

The use of electromagnetic waves for detection of shallowly buried objects has some advantages over other types of detection systems. The most important is the fact that the detection process can be remote controlled, so the risks associated with this activity can be minimized. Also an airborne radio sensor can scan a larger surface with a higher speed. Any detection process supposes a certain accuracy which has to provide the location of the object as precise as possible. In the case of an electronic device the interface between the propagation media and the device is assured by the antenna systems, which plays a critical role for the system resolution. The paper describes a simple procedure to create a synthetic aperture antenna by using the data acquired with a moving transmitting and receiving antenna system. ©2010 IEEE. Source

Faggioni O.,Italian National Institute of Geophysics and Volcanology | Soldani M.,Italian National Institute of Geophysics and Volcanology | Gabellone A.,NATO C3 Agency | Hollett R.D.,Undersea Research Center | Kessel R.T.,Undersea Research Center
Journal of Applied Geophysics

In the following, we report the advances made in the development of a magnetic component for peripheral monitoring of port environments for anti-intruder systems. The project was initiated with the aim of improving the detection performance of current acoustic-based anti-intruder systems, in the vicinity of quays or the seabed or in acoustic shadow zones behind natural or artificial objects. In the 5-year period from 2004 to 2008, the system has been subjected to detection-performance tests in experiments involving divers equipped with air tanks and rebreather kits in real port environments and, at the same time, the associated signal processing has been subjected to development, to enhance detection performance. In tests involving simulated diver attacks against a vessel moored alongside a quay in the port of La Spezia, the system has been proved particularly effective by detecting 9 divers out of 9. © 2010 Elsevier B.V. Source

Van Den Heuvel J.,NATO C3 Agency | Fiore F.,NATO C3 Agency
Proceedings of SPIE - The International Society for Optical Engineering

Improvised Explosive Devices (IEDs) triggered by pressure-plates are a serious threat in current theatres of operation. X-ray backscatter imaging (XBI) is a potential method for detecting buried pressure-plates. Monte-Carlo simulation code was developed in-house and has been used to study the potential of XBI for pressure-plate detection. It is shown that pressure-plates can be detected at depths up to 7 cm with high photon energies of 350 keV with reasonable speeds of 1 to 10 km/h. However, spatial resolution is relatively low due to multiple scattering. © 2012 SPIE. Source

Wrona K.,NATO C3 Agency | Hallingstad G.,NATO C3 Agency
Telecommunication Systems

Protected Core Networking (PCN) is an approach to creating a secure and flexible network and communications infrastructure that supports network enabled capability (NEC) operations. The real-time automated risk assessment (R-TARA) provides a theoretically and practically sound method for risk assessment in the Protected Core. The purpose of the R-TARA is multifold. On the one hand it provides a global metric, which could be used by the network operator to assess the overall security level of the network and its evolution over time. On the other hand, the results of R-TARA can be used in order to achieve dynamic accreditation. Finally, R-TARA local risk metrics, e.g. susceptibility to DoS attacks, can be used for dynamic routing decisions. We propose use of Bayesian networks, known from operational risk assessment, for PCN risk assessment and we provide analytical and simulative evaluation of R-TARA mechanisms. © 2010 Springer Science+Business Media, LLC. Source

Discover hidden collaborations