THE 36 TH INTERNATIONAL SCIENTIFIC SYMPOSIUM of the MILITARY EQUIPMENT AND TECHNOLOGIES RESEARCH AGENCY
SECURITY AND DEFENCE THROUGH R&T
WORKSHOP in cooperation ARMED
FORCES COMMUNICATIONS AND ELECTRONICS ASSOCIATION (AFCEA)
AFCEA Chapter Bucharest
St. George Hall
May 27, 2005
SESSION ONE: 09.30-12.30 hrs
CHAIRMAN: Colonel Eng. Ștefan CANTARAGIU, PhD, Chief of Research and Development Directorate from Armaments Department, General major (ret) Eng. Nicolae IRIMIE, PhD, President AFCEA “Chapter Bucharest”, Professor Eng. Alexandru ȘERBĂNESCU, PhD, Military Technical Academy
CO CHAIRMAN: Colonel Assistant Prof. Eng. Iosif PRAOVEANU, PhD, Military Equipment and Technologies Research Agency, Romania
Mirel - Călin CIUTEA, S.C. ROMSYS S.A.
„ASOC – SAMFU Interface Unit” is a system interfacing the Air Sovereignty Operations Center (ASOC) and SA-2/SA-3 SAM Firing Units. By itself a real time automation system including Electronic Interface, Workstation with touch screen based HMI, dedicated software, communication data link.
Cristian RADU, UTI Systems S.A.
Information technology is the new focus for military organizations, now more than ever, and this is because of three major factors: first - technological advancement of the society itself; second - the modernization of military doctrines in general towards a network and information centric approach, third - the evolution of national military standards and procedures required by the country status of full NATO member. Information security is another key word in this equation, along with information management, which together translates to secure electronic workflow and document management. The technical trends show an accelerated growth of demand for office automation solutions able to cope with the enormous quantity of documents and the rising complexity of information flows. This is especially true in military environments, in addition to an intrinsic constraint for secure handling of the classified information. This paper describes the way a secure workflow and document management solution, fully compliant with Romanian Army regulations, may be implemented at any level of military organizations, by employing Confluence/ a specialized product developed by UTI Systems, for defense and public safety agencies.
SOME ASPECTS CONCERNING TO THE APPLICATIONS OF SUBCARRIER MULTIPLEXING (SCM) FOR ANALOG AND DIGITAL TRANSMISSION AND COMBINATION WITH WAVELENGTH DOMAIN MEDIUM
Andrei SZILAGYI, Eugen ONU, Mihai ENACHE, Information Systems and Communications Test & Evaluation and Scientific Research
Optical Subcarrier multiplexing transmission (SCM) is a multiplexing scheme where multiple signals are multiplexed in the radiofrequency RF domain and transmitted over a single optical carrier. It is thus similar to Wavelength Domain Medium Access (WDoMA) that provides simultaneous multiple transmissions in the frequency domain.
Felix Costinel TOTIR, Information Systems and Communications Test & Evaluation and Scientific Research, Head of the Radar Research Departement eng. THALES NAVAL, Andre QUINQUIS, ENSIETA - E3I2 Research Center
Simple synthetic target models which are usually used in radar imagery algorithms are subjective: no direct link with a specified target physical structure is implemented. This way, while they remain a valuable tool in testing imagery techniques, such models are only of partial usefulness in real target classification problems. Also, for realistic radar scenario simulation, new target models need to be developed. The target model used in this paper use the “simplest component method” to simulate radar backscattered signal. This method assumes that target’s body is described by a set of elementary geometrical surfaces of known reflection characteristics. Partially scattered signals are then superposed and the global echoed signal is formed. This way, a direct and natural link with target’s physical structure is implemented. A super resolution technique (MUSIC-2D) is then used to reconstruct target ISAR image. It is interesting to study the behavior of such super resolution imagery method, adapted to estimate positions of point-like scattering centers, in the case of more complex target models. As the obtained results show, MUSIC 2D algorithm still provides good matching to the considered target model.
Lucian ANTON, Adrian Ionuț RADU, Ioan NICOLAESCU, Cristian MOLDER, Teofil OROIAN, Military Technical Academy
A very important activity is the fight against the use of antipersonnel landmines that are spread across the world. Any defining activity supposes several stages: detection, identification and clearance/destruction. The ground penetrating radars (GPR) have been investigated to be used for landmines detection. In order to detect the landmines or other objects that could be hidden in the ground signal processing methods can be used. In this paper we will present a method based on MUSIC algorithm which we expect to be more robust to noise.
BREAK: 10.45 - 11.15 hrs
Piet VAN GENDEREN, International Research Center for Telecommunications-transmission and Radar-Delft
Many types of radar must detect objects with a modest radar cross-section at a large distance. As a consequence such radars have a similar detection performance on short distances for very small objects. For instance, when an object of 1 m2 radar cross section must be detected at a distance of 100 km, an object with a radar cross section of 10-4 m2 will be detected with the same detection performance at a range of 10 km. Such a sensitivity causes that natural objects like (flocks of) birds, convective pockets of air will be detected and clutter the operator display. The paper discusses track initiation schemes based on radar with facilities like Sensitivity Time Control and Moving Target Indication. It is shown that the false track rate can be managed, however that the system is not robust in this respect. An alternative where the radial component of the object’s speed is used to size the track initiation correlation gate is more robust, but requires a totally different design of the waveform and the signal processing.
Felix Costinel TOTIR, Information Systems and Communications Test & Evaluation and Scientific Research, Emanuel RĂDOI, ENSIETA - E3I2 Research Center, Ștefan DEMETER, Military Technical Academy
Good knowledge of clutter statistical characteristics is required to design high-performance detection algorithms. Sea clutter is a special case, because of its very particular distribution and correlation laws. Furthermore, for high-resolution radars, usually used for radar imagery tasks, sea clutter is difficult to characterize, especially for low grazing angles. A phenomenological model of sea clutter, discussed in this paper, allows estimating sea clutter probability density function. The echo signal is best described as the product of a Gaussian process, with rapid variation (the speckle component), and of a slow varying component (the underlying component). Statistical distribution which provides the best fitting is the K-compound distribution. Afterwards, it is used to conceive a sea clutter simulation tool, output of which is used to corrupt synthetic target complex signatures. Then, imagery methods (Fourier 2D and MUSIC 2D algorithms) are used to reconstruct target ISAR images. A comparative study of their relative robustness is performed, showing that super resolution methods provide better performance.
Alexandru ȘERBĂNESCU, Charles CHEDHOMME, Military Technical Academy, Cosmin IVAN, University of Pitești
In the paper we present the necessity and possibility to control chaotic dynamic systems. The first part of this paper describes the methods for the identification of unstable periodic orbits (UPO) of a chaotic dynamic system. The research of an unstable periodic orbit can be done following three stages: approach towards an oscillator; search quasi-stable periodic orbits around of the same attractor, search of an unstable periodic orbit. Finally we proposed some control methods for a chaotic dynamic system, directly in phase’s space on an indeterminate unstable periodic orbit.
Alexandru TAKACS, Alexandru ȘERBĂNESCU, Military Technical Academy, Alexandru MULLER, Dan NECULOIU, Institute of Microtehnology
MicroElectroMechanical Systems (MEMS) have been proven to be one of the most promising technologies for low-loss microwave components and subsystems. MEMS switches are the basic building blocks for all of these devices, using them in either linear (e.g., varactors) or nonlinear (e.g., switches) modes. The reason is that MEMS switches have a superior RF performance compared to PIN diodes and field-effect transistor transistors from dc to 100 GHz mainly in term of insertion losses, isolation and cutoff frequency. This paper addresses the electromagnetically modeling of the MEMS devices like as switches and varactors based on MEMS capacitive shunt switches. Varactors tuning techniques are widely employed in phase shifters, oscillators and tunable filters. A MEMS parallel plate variable capacitor with an electrostatic actuator is considered the most convenient configuration to build due to simplicity of fabrication. Using a full wave electromagnetic simulator (Zeland IE3D) we investigate the performances of these types of circuits.
Răzvan TAMAȘ, Lidia CALANCEA, Naval Forces Scientific Research Centre
Broadband HF antennas are typically required in HF frequency hopping systems, since usual automatic antenna tuners are not fast enough to match the antenna as frequently as the system changes the frequency. For this purpose, we prose a new inverted-V dipoles arrangement that can ensure low VSWR, a gain up to 8dBi and a take-off angle allowing medium distance and high distance communication on almost the whole HF range. Radiation pattern and impedance analysis is performed on an electric field integral equations (EFIE) model.
Col. ing. Aurelian IONESCU, mr.dr. ing. Laurențiu BUZINCU
Col. ing. Aurelian IONESCU, mr.dr. ing. Laurențiu BUZINCU
ing. Aurelian Valentin AIFTIMIEI , AFCEA Chapter Bucurersti
Colonel Eng. Ștefan CANTARAGIU, PhD