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In the proposed work new synthetic aperture radar Doppler frequency. The position of bright points along the geometry named Generalized Inverse Synthetic Aperture Radar radar line of sight (LOS) axis (range axis) is given by time (GISAR) geometry is addressed. A new three-dimensional (3-D) analysis while their position on the cross-range axis is model of deterministic components of GISAR trajectory signals provided by Doppler frequency analysis. The range-Doppler with stepped frequency modulation is suggested. 3-D GISAR technique is based on the assumption that the Doppler geometry is described by means of the analytical geometry. The geometry and kinematics of the object and GISAR observation firequency shift of each scatterer ls constant during the system are described in separate 3-D Cartesian coordinate processing time. This can be valid assumption for low cross system. The stationary objects are presented in 3-D regular grid range resolution and for targets moving along regular of isotropic point scatterers, relatively moving with respect to trajectories. However, this is no longer valid for a target GISAR system at the velocity of the SAR carrier. The SAR undergoing irregular rotation motions, like tanks at battlefield carrier is considered unmoving placed in the origin of the where Doppler frequency shift variation during processing coordinate system of observation. The stationary targets are time induce a spreading effect of scatterers' contributions. In moving at the complex velocity equal to the geometrical sum of such a case, the use of some joint time-frequency processing the target velocity and SAR carrier velocity. The analytical is obvious [6, 10]. This allows observing the evolution of expressions to compute the range distance to point scatterers of the stationary scene and moving targets are derived. The image Doppler information durmig recordmig time. The main reconstruction procedure includes both range and azimuth advantage of such a technique is its ability to concentrate a compression: cross correlation technique to GISAR signal to wideband signal, like a chirp, while it spreads noise [7, 12]. realize range compression and short time frequency transform The problem of airborne side view ISAR imaging of ship to realize azimuth compression. A range alignment and an targets is examined in [8], which results in a robust autofocusing technique are applied to GISAR signal. To processing scheme including target motion estimation and illustrate the capability of the 3-D ISAR signal model numerical correction, optimal processing time and duration estimation experiment is implemented. and target shape extraction.In the recent publications there is a lack of description of 3-I. INTRODUCTION D geometry of the GISAR scenario with application of Synthetic aperture radar (SAR) imaging is a signal stepped frequency emitted signals combined with crossprocessing algorithm for surveillance and mapping of Earth correlation and time-frequency transform procedures for and ocean surface. SAR is a technique using t...

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