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ISAR measurements at Saab

The ISAR measurement technique and analysis at Saab is discussed. The traditional criterion for far-field distance is not satisfied as the scattering measurements often are conducted for aircraft at 100 m measurement distance. The considerable phase variation over the target that results leads to near-field measurements. We have therefore adapted a fast image based compensation method which transforms the ISAR image into the far-field region and in essence renders accurate RCS determinations for the targets. RCS measurements at Saab can be dated back to 1986. We will in this paper give an overview of our activities and methodology.