Abstract:
|
This letter presents a comparison between three
Fourier-based motion compensation (MoCo) algorithms for
airborne synthetic aperture radar (SAR) systems. These algorithms
circumvent the limitations of conventional MoCo, namely
the assumption of a reference height and the beam-center approximation.
All these approaches rely on the inherent time–frequency
relation in SAR systems but exploit it differently, with the consequent
differences in accuracy and computational burden. After
a brief overview of the three approaches, the performance of
each algorithm is analyzed with respect to azimuthal topography
accommodation, angle accommodation, and maximum frequency
of track deviations with which the algorithm can cope. Also, an
analysis on the computational complexity is presented. Quantitative
results are shown using real data acquired by the Experimental
SAR system of the German Aerospace Center (DLR). |