Range compression, range cell migration correction (RCMC), and azimuth compression are applied in time domain to obtain the final SAR image. Hilbert transform is applied to convert the real signal to complex data with phase information. Exported data from CST is arranged into a 2-d matrix of axis range and azimuth. The time domain solver in CST is based on the solution of differential form of Maxwells equations. This is analogous to an array antenna and is synthesized to create a long aperture for SAR processing. Defining mesh and other appropriate settings reflected wave is measured at several distant points within a line parallel to the viewing direction. Within CST Microwave Studio a replica of TerraSAR-X chirp signal is incident upon a modeled Corner Reflector (CR) whose design and material properties are identical to that of the real one. Raw data is later focused in MATLAB using range-doppler algorithm. This paper presents the use of a general purpose electromagnetic simulator, CST, to simulate realistic synthetic aperture radar (SAR) raw data of three-dimensional objects.
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