Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
66
16
2007
Particularities of Signal Processing at Subsurface Radar Sounding in Dispersive Media
1425-1440
10.1615/TelecomRadEng.v66.i16.10
V. G.
Sugak
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085, Ukraine
The distortions of signals appearing at subsurface radar sounding in dispersive media caused by functional dependence of phase speed of radio waves propagation upon frequency are considered. The method of compensation of these distortions is offered, allowing to essentially increase depth resolution of a sounding signal with step-by-step carrier frequency modulation.
Digital Signal Processing and Atomic Functions in Synthetic Aperture Radar
1441-1452
10.1615/TelecomRadEng.v66.i16.20
Victor Filippovich
Kravchenko
Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, 11-7, Mokhovaya St., Moscow 125009, Russia; Bauman Moscow State Technical University, 5, Vtoraya Baumanskaya St., Moscow 105005 Russia; Scientific and Technological Center of Unique Instrumentation, Russian Academy of Sciences, 15, Butlerova St., Moscow 117342, Russia
Valerii K.
Volosyuk
National Aerospace University "Kharkiv Aviation Institute", 17, Chkalova St.,
Kharkiv 61070, Ukraine
V. V.
Pavlikov
National Aerospace University "Kharkiv Aviation Institute", 17, Chkalova St.,
Kharkiv 61070, Ukraine
The paper consists of two parts. In the first part, the sampling analysis of weight windows is conducted on the basis of atomic functions (AF) and their application in problems of the classical method of synthetic aperture radar (SAR) is considered. The second part contains fundamentals of a modified method of synthetizing the aperture. The modified ambiguity function for different signals is probed. The lacks of the Ambiguity function are detected at a modified method. The paths of elimination of the indicated lacks are offered by introduction of weight processing in a technique of the modified method. The expediency of application of weight windows based on AF in reduced problems is empirically justified.
Probabilistic Characteristics of the Tracking Radar Measurer of Angular Coordinates Affected by a Deviating Interference
1453-1463
10.1615/TelecomRadEng.v66.i16.30
S. P.
Barinov
V. I.
Karpukhin
A. N.
Shcherbakov
The description of a monopulse radar measurer of angular coordinates as a linear system with nonstationary input perturbation was used to obtain new analytical relations for calculation of the probability of measurer deviation under the impact of interference deviating by the angle. Probabilistic characteristics of measurer operation at different energy and space-and-time parameters of the deviating interference were investigated. A satisfactory reproducibility of the theoretical computational results and data of semi-full-scale modeling was demonstrated.
Advanced Algorithm for Radar Detection of Icing. Calculation of Polarimetric Observables
1465-1471
10.1615/TelecomRadEng.v66.i16.40
A. A.
Pitertsev
National Aerospace University, 1, Cosmonaut Komarov Avenue, 03058 Kyiv, Ukraine
F. J.
Yanovsky
National Aviation University, 1 Kosmonavta Komarova Ave., Kyiv 03058, Ukraine
This paper deals with development of icing detection algorithm, based on remote sensing of clouds and precipitation. Conditions of aircraft icing are described. Backscattering of microwaves on water droplets and ice crystals of different shapes is considered as function of polarization, antenna elevation, size distribution of scatterers and other factors. Polarization parameters of scattered signal are calculated for hazardous and non-hazardous cases. Icing detection algorithm is proposed.
Mathematical Model of the Process of Signal Reception with Turbo-Coding Based on Hidden Markovian Circuits
1473-1487
10.1615/TelecomRadEng.v66.i16.50
E. P.
Stelmakh
M. A.
Sonkin
S. V.
Ovsyankin
Academy of the Russian Federal Security Service, Orel, Russian Federation
A mathematical model of the process of signal reception with turbo-coding based on hidden Markovian circuits is presented. A deduction of the decision rule of an adaptive coding algorithm is analyzed, and a conclusion on the need of transition to two-dimensional Markovian models is made.
Processes upon the Surface of Details of Millimeter-Wave Band Magnetrons with Secondary Emission Platinum Cathode
1489-1500
10.1615/TelecomRadEng.v66.i16.60
S. V.
Grytsayenko
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4, Krasnoznamennaya St., Kharkov 61002, Ukraine
O. M.
Suvorov
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4, Krasnoznamennaya Str., Kharkiv 61002, Ukraine
V. D.
Naumenko
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 4 Mystetstv St., Kharkiv 61002, Ukraine
A study of anode and secondary emission cathode surface of three-millimeter and eight-millimeter magnetrons was performed using the scanning electron microscope and the electron probe X-ray microanalysis after long life tests. Heterogeneous distribution of surface erosion and altering of surface composition were discovered. Possible mechanisms causing the discovered changes are described. The obtained results are important for solving of the essential problem of increasing of reliability and repeatability level of the devices applied at the most advanced microwave systems.
Silicon Radiation Detectors − Materials and Application
1501-1519
10.1615/TelecomRadEng.v66.i16.70
Yu. V.
Trubitsyn
Humane University "Zaporizhzhya institute of State and Municipal Management", 70B, ZhukovskiiSt, Zaporizhzhya, 69002, Ukraine
D. I.
Levinzon
Humane University "Zaporizhzhya institute of State and Municipal Management", 70B, ZhukovskiiSt, Zaporizhzhya, 69002, Ukraine
Nowadays, silicon detectors of nuclear radiations are available in a wide diversity of topologies and types. This diversity has become possible due to continuous increase in the quality and the diameter of the grown Si-monocrystals, development of new equipment technologies and research techniques, which are involved in the development of detectors. We have considered the essential characteristics of four main groups of the detectors on the basis of different technologies for formation of the p-n-transitions: diffusion, ion-implanted, surface-barrier and lithium-drift, with the relevant requirements to the silicon crystals. Crystal-type imperfections related to compensation with the lithium ions are represented. Equipment technologies and research techniques are described. The topologies of coordinate-sensitive detectors for recording of traces of the high-energy particles and X-ray crystallography are discussed. The experimental results obtained with using of the above devices are provided.