Sample fitting in ISAR imaging

This paper investigates the effect of sample fitting on ISAR image quality. Usually motion compensation consists of two stages. The first stage is aimed at removing the gross radial motion (i.e. range cell alignment). The second stage attempts to remove the residual phase variations not corrected in the first stage because of noise and other jamming. Sometimes, the above method fails in constructing the target images or constructs a badly damaged target image, especially for outdoor experiments. In our investigation we use sample function fitting to improve the image quality and give outdoor experimental results.