Конференция, 2011, Взаимодействието теория-практика. Ключови проблеми и решения
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Item Digital elevation models of territories under risk in Caucasus region-Armenia(Бургаски свободен университет, 2011) M.A. Grigoryan; G.M. Aleksanyan; T.N. Boyakhchyan; G. Kh. Navasardyan; L.A. Gevorgyan; Лазаров, Андон; Минчев, ДимитърIn this paper results of international team from BFU and YSU in the frames of NATO Project NATO CLG: ESP.EAP.CLG. 983876) are described. Digital Elevation Model (DEM) for selected areas of Armenia with high level of risk where natural disasters such as grounds sedimentation, landslides, mudflows, earthquakes are periodically happen, is generated. DEM can be used to create regional system for monitoring natural disasters (to control topographic changes on the territories with high level of risk) on the territory of Armenia. Tools such as InSAR systems, systems of mathematical models, GIS technologies and mathematical algorithm for processing satellite images are used. The results of monitoring and modeling can be periodically introduced to local authorities to take measures in order to prevent probable natural disasters impact on population and communications.Item SAR pseudo differencial interferogram modeling(Бургаски свободен университет, 2011) Лазаров, Андон; Минчев, ДимитърThis work addresses an algorithm of Synthetic Aperture Radar (SAR) interferogram modeling to evaluate surface displacement. The interferogram obtained is called pseudo differential interferogram. Measurements of two SAR satellites placed in one and the same point of observation are used. Linear frequency modulated emitted signal is used to produce reflected by the surface SAR signal. Two-dimensional Fourier transform is applied to extract two single look complex (SLC) images. Pseudo differential interferogram showing the ground displacement is computed. To verify proposed model a numerical experiment realization implemented in MATLAB® environment is presented.Item BISAR algorithms and MATLAB implementation(Бургаски свободен университет, 2011) Лазаров, Андон; Костадинов, ТодорThis paper deals with program implementation of Bistatic Inverse Synthetic Aperture Radar (BISAR) using to extract a high resolution image of a moving target. BISAR is a bistatic topology with stationary transmitter and receiver and a moving target. The transmitter, receiver and target, represented as an assembly of point scatterers are situated in separate coordinate systems. Geometrical and kinematical equations and a mathematical model of deterministic LFM BISAR signal are described. A program code of signal formation and image extraction is implemented in MATLAB.Item ISAR signal formation and image extraction as direct and inverse projective operation(Бургаски свободен университет, 2011) Лазаров, АндонIn this work ISAR (Inverse Synthetic Aperture Radar) signal formation and image reconstruction are analytically described and interpreted as direct and inverse projection operation. LFM (Liner Frequency Modulated) and PCM (Phase Code Modulated) emitted waveforms are used while modeling reflected ISAR returns. Complex projection operator and its Taylor expansion in the signal formation and image reconstruction procedures are defined.