Development of the procedure for forming nonstationary signal structures based on multicomponent LFM signals
Journal Title: Восточно-Европейский журнал передовых технологий - Year 2018, Vol 6, Issue 9
Abstract
<p>Noise protection of existing radio lines with noise-shaped signals and digital types of modulation was studied. Analysis has shown that the use of such signals in conditions of the radio-electronic conflict does not permit to provide necessary level of noise immunity and transmission security of radio communication lines. It was explained by presence of cyclo-conditionality of the carrier oscillation in signals with digital modulation types. Such properties simplify detection and search of signals by means of spectral correlation methods of modern hostile means of electronic surveillance.</p><p>To solve this problem, the use of nonstationary signal structures with variable central frequency and spectral density of power was proposed. A procedure of forming such signal structures by application of the Gram-Schmidt orthogonalization procedure to the ensemble of multicomponent LFM signals with controlled spectral characteristics was developed.</p><p>It was proposed to estimate various signal structures of multicomponent signal by means of phase portraits of summed signals depending on the scaling factor value. This factor’s boundary values at which complexity of the multicomponent signal structure is ensured and degeneration of the process into classical LFM is prevented were established.</p><p>Change of probability of a symbol error in a channel with the use of multicomponent orthogonal signal structures was studied depending on the signal/noise ratio. This makes it possible to estimate potential noise immunity of the radio line provided that the signal/noise ratio is determined by energy indicators of the radio channel and the spectral density of the noise of natural origin.</p>Structural security of the developed signal structures was estimated by means of an energy detector and a cyclo-stationarity detector. It was established that in the case of energy detection, nonstationary signals, and signals of any other type of modulation are equivalent. However, probability of detecting nonstationary signal structures decreased 2–2.5 times compared to other types of signal modulation when using the cyclo-stationarity detector
Authors and Affiliations
Volodymyr Korchinskyi, Matin Hadzhyiev, Pavlo Pozdniakov, Vitalii Kildishev, Valeriy Hordiichuk
Keywords
Related Articles
- EP ID EP528309
- DOI 10.15587/1729-4061.2018.151816
- Views 66
- Downloads 0
Development of the functional model to control the levels of electricity consumption by underground ironore enterprises
<p>This paper reports results of the study into assessing the features and devising a tactic for the development of structures for the systems that control levels of electricity consumption by receivers at iron-mining en...
A multifactor analysis of the rail transport car that passes over a joint unevenness with respect to the phases ot its motion
<p>We have studied the influence of loading a four-axle railroad car, geometrical and mechanical characteristics of the rail, joint bars, sleepers, and a ballast layer on the parameters of static interaction between a ra...
Entropybased methods applied to the evaluation of a real refrigeration machine
<p class="a">The aim of the research is the thermodynamic analysis of a real refrigerating machine with solid fouling on the heatexchange surface of an aircooled condenser with the help of entropy methods such as: the...
Using the intensity of absorbed gamma radiation to control the content of iron in ore
<p>The paper reports results of mathematical modeling of the intensity of absorbed gamma radiation for determining the iron content in IOR. It was shown that to enhance the accuracy of rapid control of the iron content i...
Substantiation of choosing the design of a reactordust collector with two colliding flows
<p>The objects of this study are the dust collectors for dry gas purification ‒ devices in which hydrodynamic modes are implemented. Advantages of using such devices are: work with gases of high temperature, high degree...