1. A method for detecting targets comprising moving and stationary targets with a radar system equipped with synthetic aperture radar onboard a synthetic aperture radar platform, comprising navigation equipment for accurate determination of the position of the synthetic aperture radar platform, and which is transversing a stationary ground region and targets in the said ground region, in which the synthetic aperture radar platform obtains radar data utilizing at least one antenna, the movement of the synthetic aperture radar platform during recording of the data being essentially rectilinear and uniform in an azimuth direction, and a velocity of the synthetic aperture radar platform being significantly larger than those of the moving targets, the radar system further comprising a synthetic aperture radar processor recording the radar data and the position of the at least one antenna for each transmitted radar pulse, and wherein within synthetic sub-apertures, each sub-aperture covering a surveyed region being a part of the stationary ground region, radar data are: successively merged in N iteration steps into synthetic aperture radar images of increasing resolution of the surveyed region, and wherein each iteration step consists of forming a new synthetic aperture radar image at a new iteration level by a linear combination of neighbouring successively merged synthetic aperture radar images where the linear combination being obtained by a relation such that related coordinates indicates the same target position at a given reference time for all targets having a specific relative velocity with respect to the moving synthetic aperture radar platform and a specific degree of acceleration in the direction orthogonal to the movement of the synthetic aperture radar platform.