CENG SEMINAR SERIES

"ISAR Image Reconstruction Technique with Stepped Frequency Moducation and Multiple Receivers"Prof. Andon LazarovBurgas Free UniversityBulgariaAbstract:A new three-dimensional (3-D) model of deterministic components of ISAR trajectory signals with stepped frequency modulation is suggested. 3-D ISAR geometry is described by means of analytical geometry. The geometry and kinematics of the object and ISAR observation system are described in separate 3-D Cartesian coordinate system. The object space, moving rectilinearly, is presented as a 3-D regular grid of isotropic point scatterers. The analytical expressions for computing the range distance to point scatterers of the object space are derived. The complex ISAR signal, reflected from the 3-D target is obtained by four receivers, placed on the axes and origin of the coordinate system of observation. Four 2-D ISAR signals, registered by receivers appear to be four 2-D projections of the 3-D ISAR signal. The 3-D image is considered as a set of 2-D images retrieved from the 2-D ISAR signal projections. The image reconstruction procedure includes both range and azimuth compression. Fast Fourier transforms are applied to each 2-D ISAR signal projection to realize range compression and discrete Joint time-frequency transform for azimuth compression. An autofocusing technique is applied to each received ISAR signal projection. To illustrate the capability of the 3-D ISAR signal mode, numerical experiment were caried out.Bio:ANDON DIMITROV LAZAROV received his M.S. degree in 1972 from the Electrotechnical State University-Saint Petersburg, Russia, in electronical engineering, his PhD degree in 1978 from Minsk Air-Defence Military Academy, Belarus and the D.Sc. (Doctor of Science) degree in 1998 from the Artillery and Air Defence University in Bulgaria. In 1984, he became an Associate Professor, and from 2000 until 2002 a Professor at the Air Defence Department of the Artillery and Air-Defence University in Shoumen, Bulgaria. In 2002, he became a Professor at Burgas Free University. His interests are in the field of Inverse Synthetic Aperture Radar (ISAR) technology: ISAR modelling, signal processing and image reconstruction techniques as spectral, spatial correlation, recurrent and iterative LMSE methods and auto-focusing procedures. He has authored above 150 research and conference papers. He is a member of the IEEE, the AES Society and CS of USA, and a member of Trans Black Sea Region Union of Applied Electromagnetism of Greece, and a member of the Union of Bulgarian Scientists.Host: Prof. Melvin Breuer, Ext. 04469

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