CW SAR signal model and system implementation

Abstract

Synthetic Aperture Radar (SAR) problem referred to image reconstruction of a moving target and SAR implementation is considered. Three-dimensional (3-D) SAR geometry is analytically described. The target is presented as an assembly of point scatterers. Mathematical expressions to calculate the range distance from SAR to each point scatterer are derived. SAR signal model based on a linear frequency modulated continuous wave emitted signal, 3-D geometry and reflectivity function of the target is derived. Image reconstruction procedure based on Fourier transform for range compression and azimuth compression is applied. Polynomial autofocusing algorithm for SAR imaging of a moving target is suggested. Mini SAR system is implemented and experimental results are provided. Представен е модел на сигнал с непрекъсната линейно честотна модулация и имплементация на радиолокационна система със синтезирана апертура. Дефини- рани са геометрията и основните кинематични уравнения, описващи топологията на SAR. Изведена е процедурата за възстановяване на образа. Имплементирана e SAR система.