Vojnotehnicki glasnik / Military Technical Courier

400-413

Authors: Simić Slobodan

Two LPI signal detection and parameter estimation methods are analyzed in a non-cooperative context. The first method is based on the time-frequency signal analysis along with pattern recognition techniques. The second one is based on the estimation of a periodic autocorrelation function. Frequency modulation continuous wave (FMCW) signals are analyzed as a class of waveforms often used in LPI radars. Experimentally obtained signals are used in tests. An experiment with a real FMCW signal transceiver and a receiver is carried out and the obtained signal analysis results are presented.

441-447

Authors: Šepec Vladimir V.

An approach in antitank combat modeling and analysis has been presented. The theory of mass servicing, linear transcendental equations and the theory of probability have been used in analyzing the parameters of antitank combat efficiency estimation.

463-474

Authors: Ljubojević Srđan

The latest trends in traffic management focus on more efficient usage of existing capacities. This paper tries to perceive the role of Intelligent Transportation Systems within such an approach to traffic management as well as to point out to the future of the Defense System in this field.

275-286

Authors: Novaković Zoran

The main goal of professional risk rate determination is preventive action in order to secure and protect health of employees. It considers assumption of common and special working protection measures in order to eliminate any danger or damage or to reduce workers exposition time to some risk factors in their working environments. In many cases data on former noxious events are incomplete or statistically insufficiently relevant. So the set of these data is often statistically nonhomogeneous, so are the results of statistical analysis. Thereby rated risks are insufficiently accurate and unreliable. Because of all these things, in this paper is recommend and apply an expert method which annuls this shortage and simultaneously it removes influences that are the consequence of some rate indetermination and subjectivity.

296-307

Authors: Ćuk Danilo

This paper presents the effects of the range extension of an artillery rocket with wrap around fins on its dynamic stability. The increased total impulse of the rocket engine for 50% and flight through the atmosphere layers with low air density extend the range for more than 75% of the nominal range. However, the flight of the unguided rocket through the rarefied air produces difficulties related to the dynamic stability. The small changes in the side moment which is induced by the angle of attack and Magnus moment of the improved rocket can produce instabilities in flight and increasement the angle of attack. The tolerances of the side moment were determined for both basic and improved type of the rocket in order to prevent instable flight. The influence of the range extension on the probable errors in range and cross-range was analyzed as well.

320-328

Authors: Pavlović Milorad, Jurin Gordana

This paper presents the use of noise monitoring system, terminal NMT 3637B and software 7802, Brüel & Kjær in process of jet aircraft noise certification according to standard ICAO Annex 16 and the algoritam for calculating EPNL noise level (Effective Perceived Noise Level) that we created in MatLab environment. This software sublimated all necessary input parameters, acoustic and non acoustic in purpose of getting final result and intermediate data. Those data are important for reporting to the certificating authority.

343-353

Authors: Batinić Vojislav

This paper presents methodological approach to calculation of natural frequencies and modal shapes by using of finite elements method. Modal analysis realized by application of finite elements method, results by the rule, in a large number of modal shapes (frequencies) of natural oscillation. In real conditions only some of them are excited. The main purpose of this paper is calculation of natural frequencies that we can recognize design effort and solutions for hindering of modal oscillation.

141-148

Authors: Šepec Vladimir, Devetak Saša

Important parameters for estimation efficiency of Radio-Location System in combat conditions has been presented in this article The theory of mass servicing, linear transcendental equations and theory of probability are used in the efficiency analysis of Radio-Location System.

178-191

Authors: Ivković Dejan

Software models of some functional radar units are projected in this paper and proper platform for performance improving of existent conventional radars is created. Feature improving and flexibility increasing of conventional radars can be upgraded with application of software radar concept and totally new functions can be implemented which also upgraded its performances. All software models are projected in MATLAB program. Also structure and performances of the conventional radar GIRAFFE, which is modeled by software are described. Additionally, way of the RANGE BIN memory and Doppler filter software realization are described. CFAR mathematical model is presented detailed.

198-205

Authors: Jevtović Milojko

In this paper, new concept for parallel networking of the computers or LANs over different WAN telecommunications networks, is presented. One solution of the parallel networks, which enables reliable transfer of multimedia traffic and data transmission in real time between a computer of LAN via N (N = 1, 2 3, 4,…) different inter-connected Wide Area Network. Connections between computers or LANs and wide area networks are realized using universal modems whose solution has also been presented.

214-230

Authors: Gordić Radomir S.

Target of this research was appraisal efficiency and optimization developments of organized column traffic. Elaborated and perfected model provides quick and simple target research realization for the motorized columns with different characteristics. In this work, model, methodology and results of imitation modeling, for real organized column traffic, have been shown. Work represents an original contribution to effective military column traffic.

11-18

Authors: Demić Miroslav

Spatial position of vehicle C.G. as well as angular parameters of body rotation are of major importance for analysis of vehicle dynamics, handling vibrational comfort, safe service in traffic etc. The mentioned parameters are determined by use of methods of dynamic simulation in phase of development, and by means of test measurement for vehicles in real service conditions. The problem that is to be taken into consideration here is related to practical measurement of vehicle motion parameters. Translational coordinates of vehicle C.G. are usually measured on the basis of registered linear accelerations of vehicle C.G. (once or twice integrated later, for calculation of displacement or velocity) and body angles are usually measured on gyroscope-stabilized platforms. The problem which occurs in these cases is the platform price (up to 100.000 EUR), not easily affordable for researchers. This paper attempts to determine vehicle motion parameters on the ground of six registered linear accelerations of specific body spots.

30-39

Authors: Jevtović Milojko, Pavlović Boban

In this paper the concept is presented and expected summary and feasible performance of Next Generation Networks are given. Main characteristics of the components of next generation Networks and specified most important protocols are described. Also, characteristics of Quality of Service (QoS) in multimedia telecommunication networks are presented and major characteristics of network protection are analyzed as well as possible threats and corresponding countermeasures.

50-64

Authors: Simić Slobodan

In this paper the specialties in interception of spread spectrum radar signals are exposed in regard interception of conventional pulsed radar signals. According to [1-3] and exposed examples it follow that future intercept receivers need 10-30 db selectivity enhancement to cope with modern LPI radar systems. One way is to use narrow beam, high gain antennas. Another way is trough signal processing. There is a review of existing algorithms in detection and parameter estimation of spread spectrum radar signals in non-cooperative context. Coherent methods and cross-correlation methods are put in the focus.

80-88

Authors: Alfirević Đuro

One of the information flows in a computer communication domain is accomplished by sending an e-mail, but in order to accomplish demands for information qualitativity that the e-mail contains, it's necessary for a computer network to provide the major four security services confidentiality, data integrity, authentication and non-repudiation. This work represents one of the possible solutions of secured communication applying a secured e-mail client with advantages that PKCS standard brings.