Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
67
4
2008
Bistatic Radars with Illumination by Ionospheric Signals of High-Frequency Communication Stations
285-292
10.1615/TelecomRadEng.v67.i4.10
I. V.
Lutsenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
I. V.
Popov
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy
of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
V. I.
Lutsenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine
The purpose of the present work was to consider the opportunity of the air object detection by the bistatic radars using, as an illumination signal, the ionospheric signals of high-frequency communication stations. Illumination signal spectra are investigated experimentally and the requirements to the direct signal suppression rate are determined to provide the detection at given ranges. The development of a complex of bistatic systems using the high-frequency stations is envisaged.
Field Statistics of Acoustic Array of the Equipment for Remote Sensing of the Atmosphere
293-308
10.1615/TelecomRadEng.v67.i4.20
Y. N.
Ulyanov
National Technical University "KhPI", Kharkiv, 21 Frunze Str., Kharkiv 61002, Ukraine
Nina
Maksymova
Kharkov National University of Radio Electronics
In the article, there are given simple formulas for estimation of statistical effects in acoustic arrays of the equipment for remote sensing of the atmosphere in the presence of random errors in excitation of their radiators. It is shown on an example of two concrete arrays that even small phase errors in array radiators noticeably influence a side radiation level and a directivity of the arrays. It is noted that the amplitude errors usually are less dangerous than the phase ones. Possible ways of weakening the influence of randomness on array parameters are discussed. In conclusion, expedient directions of further investigations are formulated.
Assessment of Capabilities of Radio-Electronic Protection Against Jamming of Mobile VHF Radio Communication Facilities in Urban Environment
309-318
10.1615/TelecomRadEng.v67.i4.30
A. N.
Katrusha
Military Aviation Engineering Institute, Voronezh, Russian Federation
Vladimir B.
Avdeev
Military Institute of Radioelectronics, Voronezh; State Research and Testing Institute of Problems of Technical Information Protection, Federal Service on Technical and Export Control, Voronezh, Russian Federation
Based on a deterministic model of multipath very high-frequency (VHF) wave propagation in urban environments, a methodology has been developed for calculation of time and probabilistic parameters, characterizing the extent of radio-electronic protection against jamming of mobile VHF radio communication facilities in cities.
Use of Noise-Immune Code of Variable Length to Transmit Data Between Aerial Network Users
319-322
10.1615/TelecomRadEng.v67.i4.40
B. F.
Bregman
Kaluga Research Institute for Telemechanical Devices (FGUP "KNIITMU"), Kaluga, Russia
E. V.
Borisenko
Kaluga Research Institute for Telemechanical Devices (FGUP "KNIITMU"), Kaluga, Russia
The issues of increasing the speed of data communication in telecode aerial communication channels by means of adapting the length of the cascade noise-immune code to the quality of the communication channel have been considered.
Evaluation of the Effectiveness of the Filter Quasi-Optimum Receiver of a Multifrequency Nonlinear Radio Detector
323-329
10.1615/TelecomRadEng.v67.i4.50
N. T.
Khakimov
Military Institute of Radio Electronics, Voronezh, Russia
The effectiveness of the filter quasi-optimum receiver of a multifrequency nonlinear radio detector has been estimated based on the analysis of the principles of its design.
Increasing Interference Resistance of Radio Lines of Mobile Radio Communication Network Under the Conditions of Pseudorandom Operation Frequency Tuning
331-341
10.1615/TelecomRadEng.v67.i4.60
V. I.
Popov
The Academy of Federal Security Guard Service of the Russian Federation, Orel, Russia
E. N.
Derkach
The Academy of Federal Security Guard Service of the Russian Federation, Orel, Russia
Methods for increasing interference resistance of radio lines of mobile radio communication network under the conditions of pseudorandom operation frequency tuning (POFT) by application of dynamic frequency adaptation based on combination of frequency-separated reception with control of the bearing frequency and automatic selection of the operation frequency are described. Analytical models of the methods and their implementation algorithms are provided. A comparative assessment of the efficiency of two algorithms of operation of radio lines with POFT is given.
Forming of a Beam with a Uniform Intensity Distribution in the Active Resonator of Waveguide CO2-Laser
343-351
10.1615/TelecomRadEng.v67.i4.70
V. A.
Svich
V. Karazin National University of Kharkiv, 4, Svoboda Sq., Kharkiv, 61077
A. N.
Topkov
V. Karazin Kharkiv National University 4, Svoboda Sq., 61077 Kharkiv, Ukraine
O. V.
Gurin
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022,
Ukraine
V. A.
Maslov
V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine
On the basis of a method of decomposition upon processes of diffraction and amplification-refraction the estimation of influence of a lasant on the radiation profile in the proposed construction of new waveguide CO2-laser with the homogeneous output beam is carried out. It is shown, that in deciding on the optimal sizes of the resonator mirrors and the multimode waveguide, parameters of the spatial filter on the heterogeneous mirror the lasant can facilitate a decrease of the diffraction losses of the fundamental mode and an increase of the homogeneous shape of the output beam profile of a laser radiation.
Competition of Self-Organized Rotating Helical Autowaves in Nonequilibrium Dissipative System with Three-Level Active Centers
353-377
10.1615/TelecomRadEng.v67.i4.80
D. N.
Makovetskii
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
Competition of self-organized rotating helical autowaves is computationally studied in a nonequilibrium dissipative system possessing the excitability and the two-channel diffusion of excitations. This system consists of three-level active centers interacting locally properties of which are close to the properties of active centers in a phaser (a microwave phonon laser). Dynamical stabilization and coexistence of rotating helical autowaves with different topological charges have been observed under conditions of their weak competition. A self-induced sign reversal phenomenon of a topological charge has been revealed in the case of strongly competing rotating helical autowaves; the mechanism of this nonlinear phenomenon is found. Prospects of investigations of rotating helical autowaves in nonequilibrium dissipative systems with excitable three-level active canters are discussed.