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Saint Petersburg, Russia

Characteristics of gasdynamic structures of plasma plumes formed in quiescent air of reduced density by high-power unfocused laser radiation absorbed in the supersonic radiation wave (SRW) regime have been numerically studied using a model of inviscid, equilibrium emitting air. Dependences of the SRW velocity on the laser radiation intensity at reduced air density have been determined. It is shown that the laser radiation beam diameter is a parameter that significantly influences the velocity of SRW propagation © 2012 Pleiades Publishing, Ltd.

Devyatkin A.,Mozhaisky Military Aerospace Academy | Gotur I.,Mozhaisky Military Aerospace Academy | Krasnov V.,Mozhaisky Military Aerospace Academy | Kuleshov Y.,Mozhaisky Military Aerospace Academy | Meshkov A.,Mozhaisky Military Aerospace Academy
International Journal of Remote Sensing | Year: 2014

The new procedure of ionospheric total electron content (TEC) modelling and prediction for the high-precision Global Navigation Satellite System applications is proposed and evaluated. To determine errors at coordinate measuring associated with solar activity influence on the ionosphere and, as consequence, on radio-wave propagation, the IRI2012 model has been adapted, and estimation of the solar activity index based on TEC measurement is used. Three initial conditions have been specified: (1) the calculated solar activity index does not depend on coordinates; (2) the method is based on the IRI2012 model, as this model is the most adequate one for the experiment; (3) measurement errors of the navigation signals and errors of the IRI2012 model are random ones; thus, the statistically mean values of the solar activity index have to be calculated. The equation for linear combination of satellite navigation observables (Formula presented.) is formulated to define the experimental ionospheric delay. This equation is supplemented with the expression including the TEC values for two different elevation angles along line from receiver to satellite. The calculated solar activity index (called FTEC) is determined on the basis of the experimental delay and model simulation values. Daily variation of the calculation error of the Belmopan_BLZ2012 station coordinates has been compared, using the correction of the ionospheric delays based on both the map proposed by the authors and TEC US-TEC map. The comparison has revealed the presence of approximately equal errors that are on the average equal to 5 m with the standard deviation up to ~1.8 m. © 2014, Taylor & Francis.

Pirogov S.Y.,Mozhaisky Military Aerospace Academy | Belyanin D.G.,Mozhaisky Military Aerospace Academy | Yur'ev A.S.,Mozhaisky Military Aerospace Academy | Tipaev V.V.,Mozhaisky Military Aerospace Academy | Filatov A.V.,Mozhaisky Military Aerospace Academy
Technical Physics Letters | Year: 2010

Spatiotemporal gasdynamic plasma structures formed in quiescent air of elevated density by high-power unfocused laser radiation absorbed in the light-induced detonation (LID) wave regime have been numerically studied using a model of inviscid, equilibrium emitting air. Laser radiation intensity and air density serve as parameters of the model. Dependences of the velocity of LID wave on the laser radiation intensity at elevated air densities are presented. © 2010 Pleiades Publishing, Ltd.

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