S-method in radar imaging

Commonly used technique for the SAR and ISAR signal analysis is a two-dimensional Fourier transform. Moving targets in SAR or maneuvering targets in ISAR case, induce Doppler-shift and Doppler spread in the returned signal, producing blurred or smeared images. Standard techniques for the solution of these problems are motion compensation and time-frequency analysis based techniques. Both of them are computationally intensive. Here, we will present a numerically simple S-method based approach that belongs to the time-frequency techniques. Beside the basic S-method here we will present the signal adaptive form and two-dimensional form of this method. They improve readability of the radar images what will be demonstrated on the simulated SAR and ISAR setups.