SAR focusing: scaled inverse Fourier transformation and chirp scaling

The SAR focusing process presented is realized by scaled inverse Fourier transformation. The basic idea by R. Lanari exploits the fact that the raw data spectrum is a 'deformed' replica of the scene spectrum. Removing this deformation by applying a scaled IFFT (inverse FFT) directly yields the focused image. The paper shortly reviews the derivation of the algorithm, discusses the relationship to chirp scaling algorithms, and presents some results.