Inverse Synthetic Aperture Radar (ISAR) Geometry, Kinematics, Signal Modeling and Image Reconstruction Algorithms
Aperture synthesis is an approach in astronomy, radio-, laser- and sonar locating and imaging technologies for creating artificial antenna arrays with high resolution patterns. Two kinds of aperture synthesis can be
defined, direct aperture synthesis and inverse aperture synthesis. The former is created by moving of an antenna with a wide pattern over observed surface or object, the latter is created by moving of the
observed object in the frame of an antenna pattern. In both cases a reflectivity patterns or radar cross-sections of the observed surface and objects are recorded (registered). In some extent, the objects' reflectivity patterns or radar cross sections can be called synthetic apertures. In common case the synthetic apertures are two-dimensional ones. The first dimension, along track or azimuth, is realized by movement of the antenna or the object, the second dimension is realized by using high-informative wide band frequency waveforms.
The focus of the present research is on the inverse aperture synthesis and its applications in high resolution imaging radar – Inverse Synthetic Aperture Radar (ISAR). The main goals are as follows: three-dimensional geometry and kinematics of ISAR scenario, high informative waveforms (signals) with linear frequency modulation, stepped frequency modulation, phase code modulation, and complementary phase code modulation, ISAR signal formation with aforementioned waveforms, non parametric and parametric image reconstruction algorithms and auto focusing procedures. To verify geometrical and signal models, and imaging algorithms results of numerical experiments are provided.