107 research outputs found
Spontaneous polarization and piezoelectricity in boron nitride nanotubes
Ab initio calculations of the spontaneous polarization and piezoelectric
properties of boron nitride nanotubes show that they are excellent
piezoelectric systems with response values larger than those of piezoelectric
polymers. The intrinsic chiral symmetry of the nanotubes induces an exact
cancellation of the total spontaneous polarization in ideal, isolated nanotubes
of arbitrary indices. Breaking of this symmetry by inter-tube interaction or
elastic deformations induces spontaneous polarization comparable to those of
wurtzite semiconductors.Comment: 5 pages in PRB double column format, 3 figure
Tight-binding study of structure and vibrations of amorphous silicon
We present a tight-binding calculation that, for the first time, accurately
describes the structural, vibrational and elastic properties of amorphous
silicon. We compute the interatomic force constants and find an unphysical
feature of the Stillinger-Weber empirical potential that correlates with a much
noted error in the radial distribution function associated with that potential.
We also find that the intrinsic first peak of the radial distribution function
is asymmetric, contrary to usual assumptions made in the analysis of
diffraction data. We use our results for the normal mode frequencies and
polarization vectors to obtain the zero-point broadening effect on the radial
distribution function, enabling us to directly compare theory and a high
resolution x-ray diffraction experiment
Predicting polarization enhancement in multicomponent ferroelectric superlattices
Ab initio calculations are utilized as an input to develop a simple model of
polarization in epitaxial short-period CaTiO3/SrTiO3/BaTiO3 superlattices grown
on a SrTiO3 substrate. The model is then combined with a genetic algorithm
technique to optimize the arrangement of individual CaTiO3, SrTiO3 and BaTiO3
layers in a superlattice, predicting structures with the highest possible
polarization and a low in-plane lattice constant mismatch with the substrate.
This modelling procedure can be applied to a wide range of layered
perovskite-oxide nanostructures providing guidance for experimental development
of nanoelectromechanical devices with substantially improved polar properties.Comment: 4 pages, submitted to PR
Liquid-liquid phase transition in Stillinger-Weber silicon
It was recently demonstrated that the Stillinger-Weber silicon undergoes a
liquid-liquid first-order phase transition deep into the supercooled region
(Sastry and Angell, Nature Materials 2, 739 (2003)). Here we study the effects
of perturbations on this phase transition. We show that the order of the
liquid-liquid transition changes with negative pressure. We also find that the
liquid-liquid transition disappears when the three-body term of the potential
is strengthened by as little as 5 %. This implies that the details of the
potential could affect strongly the nature and even the existence of the
liquid-liquid phase.Comment: 13 page
Π‘ΠΌΠ΅ΡΠ΅Π½ΠΈΠ΅ ΡΡΠΎΠ²Π½Ρ Π·Π½Π°ΡΠΈΠΌΠΎΡΡΠΈ ΠΈ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ ΠΊΡΠΈΡΠ΅ΡΠΈΡ ΠΏΡΠΈ ΠΊΠΎΠ½Π΅ΡΠ½ΠΎΠΉ ΠΊΡΡΡΠΈΠ·Π½Π΅ ΠΏΠ΅ΡΠ΅Ρ ΠΎΠ΄Π½ΠΎΠΉ Ρ Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ
ΠΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½Ρ ΡΠΌΠ΅ΡΠ΅Π½ΠΈΡ ΡΡΠΎΠ²Π½Ρ Π·Π½Π°ΡΠΈΠΌΠΎΡΡΠΈ ΠΈ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ ΠΊΡΠΈΡΠ΅ΡΠΈΡ, ΠΊΠΎΠ³Π΄Π° ΠΏΡΠΈ ΠΏΡΠΎΠ²Π΅ΡΠΊΠ΅ ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π³ΠΈΠΏΠΎΡΠ΅Π· Ρ ΠΈΡΠΏΠΎΠ»ΡΠ·ΠΎΠ²Π°Π½ΠΈΠ΅ΠΌ ΠΏΡΠ°Π²ΠΈΠ»Π° ΠΠ΅ΠΉΠΌΠ°Π½Π° β ΠΠΈΡΡΠΎΠ½Π° Π² ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΏΠ΅ΡΠ΅Ρ
ΠΎΠ΄Π½ΠΎΠΉ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ Π»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΡ
Π΅ΠΌΡ ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΡΡΡ ΠΏΡΠΎΡΡΠ°Ρ ΡΡΠ½ΠΊΡΠΈΡ ΠΎΡΠΈΠ±ΠΎΠΊ. Π‘ΠΌΠ΅ΡΠ΅Π½ΠΈΡ ΡΠ°ΡΡΡΠΈΡΠ°Π½Ρ Π΄Π»Ρ ΡΡΠ»Π΅Π΅Π²ΡΠΊΠΈΡ
ΡΡΠ½ΠΊΡΠΈΠΉ ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΡ. Π ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ ΠΎΠ΄Π½ΠΎΠ³ΠΎ ΠΈΠ· Π²Π°ΡΡΠΈΡΡΠ΅ΠΌΡΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΠΈΡΠΏΠΎΠ»ΡΠ·ΡΠ΅ΡΡΡ ΠΎΠ±ΠΎΠ±ΡΠ΅Π½Π½ΠΎΠ΅ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠ΅ ΡΠΈΠ³Π½Π°Π»-ΠΏΠΎΠΌΠ΅Ρ
Π°.Β ΠΠ°Ρ
ΠΌΠ°Π½ΡΠΎΠ½ Π. Π‘., ΠΠΎΡΡΠ΅Π½Π½ΠΈΠΊΠΎΠ² Π. Π‘., ΠΠΈΡΠ°ΠΊ Π. Π. Π‘ΠΌΠ΅ΡΠ΅Π½ΠΈΠ΅ ΡΡΠΎΠ²Π½Ρ Π·Π½Π°ΡΠΈΠΌΠΎΡΡΠΈ ΠΈ ΠΌΠΎΡΠ½ΠΎΡΡΠΈ ΠΊΡΠΈΡΠ΅ΡΠΈΡ ΠΏΡΠΈ ΠΊΠΎΠ½Π΅ΡΠ½ΠΎΠΉ ΠΊΡΡΡΠΈΠ·Π½Π΅ ΠΏΠ΅ΡΠ΅Ρ
ΠΎΠ΄Π½ΠΎΠΉ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ. Ural Radio Engineering Journal. 2022;6(4):378β389. DOI: 10.15826/urej.2022.6.4.002
Raman Study of Oxygen Reduced and Re-Oxidized Strontium Titanate
We report Raman study of oxygen-reduced single crystal strontium titanate. Oxygen reduction leads to the appearance of the forbidden first order Raman peaks, as well as new spectral features attributed to the local vibrational modes associated with oxygen vacancies. This assignment is supported by ab initio calculations of phonon modes in SrTiO3 with introduced oxygen vacancies. Raman studies of re-oxidized samples show the same spectra as the initial single crystals. Comparison of Raman spectra of SrTiO3 thin films and reduced SrTiO3 single crystals demonstrates the importance of other factors such as polar grain boundaries in the lattice dynamical behavior of thin films
ΠΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΠ΅ ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΉ Π΄Π²ΠΈΠΆΡΡΠΈΡ ΡΡ ΠΏΡΡΠΌΠΎΠ»ΠΈΠ½Π΅ΠΉΠ½ΠΎ Π²ΠΎΠ·Π΄ΡΡΠ½ΡΡ ΡΠ΅Π»Π΅ΠΉ ΠΏΡΠΈ Π²ΡΠΎΡΠΈΡΠ½ΠΎΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠ΅ ΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ
Introduction. The primary functions of secondary processing of radar information are to detect and maintain the trajectories of air targets (AT). The AT trajectory detection can be characterised by the probability of detecting trajectory and average autocapture time. When the target moves, its distance from the radar station changes, leading to a change in the signal/noise ratio and the probability of detecting AT.Aim. To assess the impact of a change in the probability of detection of a straight and evenly moving target at consecutive time intervals of radar observation upon the characteristics of trajectory detection during secondary processing of radar information.Methods and materials. The research aim was achieved using the methods of mathematical statistics, including verification of statistical hypotheses, assessment of distribution parameters and theory of perturbations by small parameters. The ratio of the distance travelled by the AT during the review period to the target range at the initial moment of its detection was chosen as a perturbation parameter.Results. Analytical expressions were established for the probability of detecting a straight-moving AT and the probability of detecting the trajectory of its movement at interval multiples during the study period. The study illustrated the probability of detecting AT moving away from radar by means of consistent radar observations with reduced signal/noise ratios and angles between the velocity vector and the AT vector radius relative to the radar. The increase in AT speed which causes the z parameter to change from 0.01 to 0.07 reduces the probability of AT detection from 0.727 to 0.52 and leads to a corresponding change in the probability of detecting the trajectory. If the observation time is reduced by one time interval, the probability of detecting the trajectory is from 0.03 to 0.04β¦0.07 for signal/noise 40 ratio and from 0.06 to 0.08β¦0.11 for signal/noise 25 ratio (with the probability of false alarm 10β4 ).Conclusion. The resulting expressions allow for the calculation of directly moving AT trajectory detection, considering changes in the probability of detecting targets in successive time intervals of radar observations.ΠΠ²Π΅Π΄Π΅Π½ΠΈΠ΅. ΠΡΠ½ΠΎΠ²Π½ΡΠΌΠΈ Π·Π°Π΄Π°ΡΠ°ΠΌΠΈ Π²ΡΠΎΡΠΈΡΠ½ΠΎΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠΈ ΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ ΡΠ²Π»ΡΡΡΡΡ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΠ΅ ΠΈ ΡΠΎΠΏΡΠΎΠ²ΠΎΠΆΠ΄Π΅Π½ΠΈΠ΅ ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΉ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ Π²ΠΎΠ·Π΄ΡΡΠ½ΡΡ
ΡΠ΅Π»Π΅ΠΉ (ΠΠ¦). ΠΡΠΈ ΡΡΠΎΠΌ ΠΏΡΠΎΡΠ΅ΡΡ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΉ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ ΠΠ¦ ΠΏΡΠΈΠ½ΡΡΠΎ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΠ·ΠΎΠ²Π°ΡΡ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΡΠΌΠΈ ΠΈΡ
ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΠΈ ΡΡΠ΅Π΄Π½ΠΈΠΌ Π²ΡΠ΅ΠΌΠ΅Π½Π΅ΠΌ ΠΈΡ
Π°Π²ΡΠΎΠ·Π°Ρ
Π²Π°ΡΠ°. ΠΡΠΈ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΠΈ ΡΠ΅Π»ΠΈ Π΅Π΅ Π΄Π°Π»ΡΠ½ΠΎΡΡΡ ΠΎΡ ΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΡΠ°Π½ΡΠΈΠΈ (Π ΠΠ‘) ΠΈΠ·ΠΌΠ΅Π½ΡΠ΅ΡΡΡ, ΡΡΠΎ ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΡ ΠΊ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΡΠΈΠ³Π½Π°Π»/ΡΡΠΌ ΠΈ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΠΠ¦.Π¦Π΅Π»Ρ ΡΠ°Π±ΠΎΡΡ. ΠΡΠ΅Π½ΠΊΠ° Π²Π»ΠΈΡΠ½ΠΈΡ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΠΏΡΡΠΌΠΎΠ»ΠΈΠ½Π΅ΠΉΠ½ΠΎ Π΄Π²ΠΈΠΆΡΡΠ΅ΠΉΡΡ ΡΠ΅Π»ΠΈ ΠΏΡΠΈ ΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΎΠ½Π½ΡΡ
Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΡΡ
Π½Π° Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΈ Π΅Π΅ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ ΠΏΡΠΈ Π²ΡΠΎΡΠΈΡΠ½ΠΎΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠ΅ ΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ.ΠΠ΅ΡΠΎΠ΄Ρ. ΠΡΠΏΠΎΠ»ΡΠ·ΡΡΡΡΡ ΠΌΠ΅ΡΠΎΠ΄Ρ ΠΌΠ°ΡΠ΅ΠΌΠ°ΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΡΠ°ΡΠΈΡΡΠΈΠΊΠΈ: ΠΏΡΠΎΠ²Π΅ΡΠΊΠ° ΡΡΠ°ΡΠΈΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π³ΠΈΠΏΠΎΡΠ΅Π·, ΠΎΡΠ΅Π½ΠΊΠ° ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΡΠ°ΡΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠΉ ΠΈ ΡΠ΅ΠΎΡΠΈΡ Π²ΠΎΠ·ΠΌΡΡΠ΅Π½ΠΈΠΉ ΠΏΠΎ ΠΌΠ°Π»ΠΎΠΌΡ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡ. Π ΠΊΠ°ΡΠ΅ΡΡΠ²Π΅ Π²ΠΎΠ·ΠΌΡΡΠ°ΡΡΠ΅Π³ΠΎ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠ° Π²ΡΠ±ΡΠ°Π½ΠΎ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠ΅ ΡΠ°ΡΡΡΠΎΡΠ½ΠΈΡ, ΠΏΡΠΎΡ
ΠΎΠ΄ΠΈΠΌΠΎΠ³ΠΎ ΠΠ¦ Π·Π° ΠΏΠ΅ΡΠΈΠΎΠ΄ ΠΎΠ±Π·ΠΎΡΠ°, ΠΊ Π΄Π°Π»ΡΠ½ΠΎΡΡΠΈ ΡΠ΅Π»ΠΈ Π² Π½Π°ΡΠ°Π»ΡΠ½ΡΠΉ ΠΌΠΎΠΌΠ΅Π½Ρ Π΅Π΅ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ.Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΠΎΠ»ΡΡΠ΅Π½Ρ Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π²ΡΡΠ°ΠΆΠ΅Π½ΠΈΡ Π΄Π»Ρ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΠΏΡΡΠΌΠΎΠ»ΠΈΠ½Π΅ΠΉΠ½ΠΎ Π΄Π²ΠΈΠΆΡΡΠ΅ΠΉΡΡ ΠΠ¦ ΠΈ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΈ Π΅Π΅ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ Π½Π° ΠΈΠ½ΡΠ΅ΡΠ²Π°Π»Π°Ρ
, ΠΊΡΠ°ΡΠ½ΡΡ
ΠΏΠ΅ΡΠΈΠΎΠ΄Ρ ΠΎΠ±Π·ΠΎΡΠ°. ΠΡΠΎΠΈΠ»Π»ΡΡΡΡΠΈΡΠΎΠ²Π°Π½ΠΎ ΡΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΠ΅ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΠΠ¦, ΡΠ΄Π°Π»ΡΡΡΠ΅ΠΉΡΡ ΠΎΡ Π ΠΠ‘, ΠΏΡΠΈ ΠΏΠΎΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½ΡΡ
ΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΎΠ½Π½ΡΡ
Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΡΡ
Ρ ΡΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΠ΅ΠΌ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠΉ ΡΠΈΠ³Π½Π°Π»/ΡΡΠΌ ΠΈ ΡΠ³Π»Π° ΠΌΠ΅ΠΆΠ΄Ρ Π²Π΅ΠΊΡΠΎΡΠΎΠΌ ΡΠΊΠΎΡΠΎΡΡΠΈ ΠΈ ΡΠ°Π΄ΠΈΡΡΠΎΠΌ-Π²Π΅ΠΊΡΠΎΡΠΎΠΌ ΠΠ¦ ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ Π ΠΠ‘. Π£Π²Π΅Π»ΠΈΡΠ΅Π½ΠΈΠ΅ ΡΠΊΠΎΡΠΎΡΡΠΈ ΠΠ¦, Π²ΡΠ·ΡΠ²Π°ΡΡΠ΅Π΅ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠ΅ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠ° z Ρ 0.01 Π΄ΠΎ 0.07, ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΡ ΠΊ ΡΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΡ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΠΠ¦ Ρ 0.727 Π΄ΠΎ 0.52 ΠΈ ΠΊ ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠ΅ΠΌΡ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΈ. ΠΡΠΈ ΡΠΎΠΊΡΠ°ΡΠ΅Π½ΠΈΠΈ Π²ΡΠ΅ΠΌΠ΅Π½ΠΈ Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΡ Π½Π° ΠΎΠ΄ΠΈΠ½ Π²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠΉ ΠΈΠ½ΡΠ΅ΡΠ²Π°Π» ΡΠΌΠ΅Π½ΡΡΠ΅Π½ΠΈΠ΅ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΈ ΡΠΎΡΡΠ°Π²Π»ΡΠ΅Ρ ΠΎΡ 0.03 Π΄ΠΎ 0.04...0.07 Π΄Π»Ρ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΡΠΈΠ³Π½Π°Π»/ΡΡΠΌ 40 ΠΈ ΠΎΡ 0.06 Π΄ΠΎ 0.08...0.11 Π΄Π»Ρ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΡ ΡΠΈΠ³Π½Π°Π»/ΡΡΠΌ 25 (ΠΏΡΠΈ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠΈ Π»ΠΎΠΆΠ½ΠΎΠΉ ΡΡΠ΅Π²ΠΎΠ³ΠΈ 10β4 ).ΠΠ°ΠΊΠ»ΡΡΠ΅Π½ΠΈΠ΅. ΠΠΎΠ»ΡΡΠ΅Π½Π½ΡΠ΅ Π²ΡΡΠ°ΠΆΠ΅Π½ΠΈΡ ΠΏΠΎΠ·Π²ΠΎΠ»ΡΡΡ ΡΠ°ΡΡΡΠΈΡΡΠ²Π°ΡΡ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΈ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΉ Π²ΠΎΠ·Π΄ΡΡΠ½ΡΡ
ΡΠ΅Π»Π΅ΠΉ, Π΄Π²ΠΈΠΆΡΡΠΈΡ
ΡΡ ΠΏΡΡΠΌΠΎΠ»ΠΈΠ½Π΅ΠΉΠ½ΠΎ, Ρ ΡΡΠ΅ΡΠΎΠΌ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠ΅ΠΉ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΡΠ΅Π»Π΅ΠΉ Π² ΠΏΠΎΡΠ»Π΅Π΄ΠΎΠ²Π°ΡΠ΅Π»ΡΠ½ΡΡ
Π²ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ
ΠΈΠ½ΡΠ΅ΡΠ²Π°Π»Π°Ρ
ΠΎΠ±Π·ΠΎΡΠ° ΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΎΠ½Π½ΡΡ
Π½Π°Π±Π»ΡΠ΄Π΅Π½ΠΈΠΉ
ΠΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΎΠ±Π½Π°ΡΡΠΆΠ΅Π½ΠΈΡ ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΉ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ Π²ΠΎΠ·Π΄ΡΡΠ½ΡΡ ΡΠ΅Π»Π΅ΠΉ ΠΏΡΠΈ Π²ΡΠΎΡΠΈΡΠ½ΠΎΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠ΅ ΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ
The article considers statistical descriptions of time interval estimation for air target motion trajectory au-tomatic detection in radar information secondary processing. Analytical expressions for confidential proba-bilities of the air target motion trajectory automatic detection are obtained. It is supposed that the target loca-tion mark appearance is invariable within the whole observation time. The confidential probability dependences are analyzed from the signal noise ratio for the received signals with random amplitudes and elementary phases. It is shown that the target motion trajectory determination probability increases with the increase of signal noise ratio and decrease of radar observation period number.Π Π°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΡΡΡ ΠΈΠ½ΡΠ΅ΡΠ²Π°Π»ΡΠ½Π°Ρ ΠΎΡΠ΅Π½ΠΊΠ° Π²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΈΠ½ΡΠ΅ΡΠ²Π°Π»Π° Π°Π²ΡΠΎΠ·Π°Ρ
Π²Π°ΡΠ° ΡΡΠ°Π΅ΠΊΡΠΎΡΠΈΠΈ Π΄Π²ΠΈΠΆΠ΅Π½ΠΈΡ Π²ΠΎΠ·Π΄ΡΡΠ½ΡΡ
ΡΠ΅Π»Π΅ΠΉ ΠΏΡΠΈ Π²ΡΠΎΡΠΈΡΠ½ΠΎΠΉ ΠΎΠ±ΡΠ°Π±ΠΎΡΠΊΠ΅ ΡΠ°Π΄ΠΈΠΎΠ»ΠΎΠΊΠ°ΡΠΈΠΎΠ½Π½ΠΎΠΉ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ. ΠΠΎΠ»ΡΡΠ΅Π½Ρ Π°Π½Π°Π»ΠΈΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ Π²ΡΡΠ°ΠΆΠ΅Π½ΠΈΡ Π΄Π»Ρ Π΄ΠΎΠ²Π΅ΡΠΈΡΠ΅Π»ΡΠ½ΡΡ
Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠ΅ΠΉ, ΡΠΎΠΎΡΠ²Π΅ΡΡΡΠ²ΡΡΡΠΈΡ
Π·Π°Π΄Π°Π½Π½ΡΠΌ Π²ΡΠ΅ΠΌΠ΅Π½Π½ΡΠΌ ΠΈΠ½ΡΠ΅ΡΠ²Π°Π»Π°ΠΌ. ΠΠ½Π°Π»ΠΈΠ·ΠΈΡΡΡΡΡΡ Π·Π°Π²ΠΈΡΠΈΠΌΠΎΡΡΠΈ Π΄ΠΎΠ²Π΅ΡΠΈΡΠ΅Π»ΡΠ½ΡΡ
Π²Π΅ΡΠΎΡΡΠ½ΠΎΡΡΠ΅ΠΉ ΠΎΡ ΠΎΡΠ½ΠΎΡΠ΅Π½ΠΈΠΉ "ΡΠΈΠ³Π½Π°Π»/ΡΡΠΌ" ΠΏΡΠΈ ΠΏΡΠΈΠ΅ΠΌΠ΅ ΡΠΈΠ³Π½Π°Π»ΠΎΠ² ΡΠΎ ΡΠ»ΡΡΠ°ΠΉΠ½ΡΠΌΠΈ Π°ΠΌΠΏΠ»ΠΈΡΡΠ΄Π°ΠΌΠΈ ΠΈ Π½Π°ΡΠ°Π»ΡΠ½ΡΠΌΠΈ ΡΠ°Π·Π°ΠΌΠΈ
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