Begell House Inc.
Telecommunications and Radio Engineering
TRE
0040-2508
70
19
2011
RADAR TARGET VISIBILITY OVER THE SEA: DEVELOPMENT OF PREDICTION TECHNIQUES AT THE IRE NATIONAL ACADEMY OF SCIENCES OF UKRAINE
1701-1728
10.1615/TelecomRadEng.v70.i19.10
V. K.
Ivanov
O.Ya. Usikov Institute for Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkiv 61085, Ukraine
V. N.
Shalyapin
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkiv 61085, Ukraine
Yurii V.
Levadnyi
O.Ya. Usikov Institute for Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkiv 61085, Ukraine
radar visibility; radio wave propagation; tropospheric ducting
The paper is a historic review of the developments in a major field of research at the IRE of Ukraine - namely, prediction of radar target visibility over the sea. The results of early field campaigns in the Black and Baltic Sea areas are presented which permitted relating the radar visibility of targets on the sea surface to meteorological conditions along the radio propagation path. The expeditions of IRE researchers that were held in 1950s cast light, among other things, on the origin of 'radio troughs', or sharp drops in the level of the radio signal owing to a screening effect of elevated layers of inversion. The latter are known to substantially influence the operation of radio communication, radar and navigation systems. The results obtained over inland seas formed a basis for the development of methods to estimate radar visibility and compose radio climatic maps. The extended programs adopted later for studying radio propagation over the World Ocean (1970s and 1980s) allowed creating a databank of radio meteorological parameters which proved useful for the design and operation of radar systems. A prediction technique was developed for estimating the radar visibility of surface and aerial targets, and an applied software packet created which allows signal level computations based on meteorological data.
A MODEL OF A FIBER-OPTICAL BASEBAND TRANSMISSION PATH WITH WAVELENGTH-DIVISION MULTIPLEXING AND FIBER-OPTICAL AMPLIFIERS
1729-1738
10.1615/TelecomRadEng.v70.i19.20
I. A.
Saitov
The Academy of Federal Security Guard Service of the Russian Federation, Orel, Russia
N. I.
Myasin
Academy of the Russian Federal Security Service, Orel, Russian Federation
A new model of a fiber-optical baseband transmission path with linear fiber-optical amplifiers, taking into account the dominant effect of the stimulated Raman scattering on the optical signal parameters, is proposed. An application of the developed model in the problem of optimization of optical component parameters is discussed.
ENHANCING IMAGE EDGES USING THE GREEN FUNCTION
1739-1749
10.1615/TelecomRadEng.v70.i19.30
Yu. F.
Boltov
St. Petersburg M. A. Bonch-Bruevich State University of Telecommunications, St. Petersburg, Russian Federation
Green function
image edge
residual field
information compression
rectangular window
structured field
A new method of enhancing image edges based on the Green function is suggested. This approach allows a fast and qualitative algorithm for image processing.
ON THE POSSIBILITY OF SEA STATE DIAGNOSTICS USING THE RADIO SIGNALS FROM GPS SATELLITES AT LAW ANGLES
1751-1761
10.1615/TelecomRadEng.v70.i19.40
V. B.
Sinitski
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine
GPS satellites
moving average method
diffuse component of the signal
sea state diagnostics
Results of real measurements of radio signals from GPS satellites during the satellite setting over the sea surface are presented. It has been found that the diffuse component of the signal scattered by sea surface shows time-to-time variability which effect is dependent on the wind speed in the region of measurements.
ELF PULSE AT KARYMSHINO ASSOCIATED WITH GAMMA RAY FLARE OF 27.12.2004
1763-1770
10.1615/TelecomRadEng.v70.i19.50
A. P.
Nickolaenko
O.Ya. Usikov Institute for Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura St., Kharkiv 61085, Ukraine
A. Yu.
Schekotov
Schmidt Institute of Earth Physics, Russian Academy of Sciences, 10 B. Gruzinskaya St., Moscow, 123995, Russia
ELF transient
the Schumann resonance
gamma ray pulse
We examine electromagnetic pulse associated with an abrupt change of the height of the Earth-ionosphere cavity that was caused by intense gamma ray flare on 21:30:26.5 UT on December 27, 2004. We demonstrate that parameters of observed extremely low frequency (ELF) radio pulse correspond to model expectations: the wave arrival angle is close to the direction toward the epicenter of ionosphere modification, the pulsed waveform is similar to that computed, and its amplitude exceeds the level of the regular Schumann resonance background by a few times. Simultaneously, the pulse onset at the Karymshino observatory (52,827° N, 158,132° E) is ~ 0.16 s in advance relative to the published time of modification in the VLF records.
INDENTIFICATION OF POTABLE WATER SPRINGS OF THE KHARKOV REGION USING TEMPERATURE DEPENDENCE OF THEIR REFRACTION INDEXES
1771-1777
10.1615/TelecomRadEng.v70.i19.60
A. Ya.
Kirichenko
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine 12, Academician Proskura St., Kharkov 61085
G. V.
Golubnichaya
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine
vibrating string method
permittivity
water
Refraction indexes of water samples from different springs and their dependencies upon temperature are studied in the millimeter wavelength range using the vibrating string method. It is established that the temperature dependence of the refraction index in the temperatures range under investigation can be approximated by the linear dependence. It is shown that the coefficient of linear regression of temperature dependence allows one very fay belonging of waters to different springs.
ON THE POSSIBILITY OF USING ADDITIONAL CODE SEQUENCES IN ANALOG NARROWBAND WIRE TELEPHONE SYSTEMS
1779-1795
10.1615/TelecomRadEng.v70.i19.70
L. V.
Lityuk
Technological Institute, Southern Federal University, Taganrog, Russian Federation
V. I.
Lityuk
Technological Institute, Southern Federal University, Taganrog, Russian Federation
The possibility of using additional code sequences in analog narrowband wire telephone systems is discussed. Operations needed for the generation of signals on the transmission side and their processing on the reception side are described.