Конференция, 2010, Предизвикателства пред Висшето образование и научните изследвания в условията на криза
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Item SAR модел на процеса на изобразяване(Бургаски свободен университет, 2010) Лазаров, Андон; Минчев, ДимитърThis work addresses the model of SAR imaging process. SAR Geometry with thoroughly mathematical description of the observed surface is suggested. SAR emitted signal with linear frequency modulation is used to produce reflected by surface SAR signal model presented as four-dimensional array (matrix) and generated by Hadamard product with special defined rectangular function. Two-dimensional Fourier transform is applied to obtain single look complex image, which can be used to generate interferograms. To verify proposed geometrical and signal models a realization of the processing chain, implemented in MATLAB environment is illustrated.Item ISAR image reconstruction algorithm(Бургаски свободен университет, 2010) Лазаров, АндонThis paper deals with generalized ISAR geometry and image reconstruction technique. Three-dimensional (3-D) ISAR scenario is projected on two-dimensional (2-D) radar registration plane. The arbitrary movement of the object is decomposed into two components: radial displacement of the object’s geometric center and rotational movement around it. It is proven that the demodulated ISAR signal, reflected from the target during aperture synthesis, can be considered as 2-D Fourier transformation of the image function, corrected by an exponential term and as a consequence, the image function can be extracted by 2-D inverse Fourier transformation of the phase corrected ISAR signal. Numerical experiment validating aforementioned statements is performed.Item InSAR геометрия и базови операции(Бургаски свободен университет, 2010) Лазаров, АндонIn the present work based on geometrical interpretation of Inverse Synthetic Aperture Radar (InSAR) scenario, main parameters, characteristics and operations over InSAR data are defined. SAR interferogram and interferometric phase SAR equations are derived and procedure of interferogram flattening is given. The procedures of terrain motion evaluation and differential interferogram generation are presented. Basic operations including rectification of the elevation map, co-registration, and coherence evaluation, and phase unwrapping are discussed. Numerical experiment is carried out to verify geometrical interpretation of the interferogam generation and main operation performance.