Focusing ISAR Images Using the Adaptive Local Polynomial Fourier Transform

摘要

The adaptive local polynomial Fourier transform is employed for the improvement of the ISAR images in complex reflector geometry cases, as well as in cases of fast maneuvering targets. It has been shown that this simple technique can produce significantly improved results with a relatively modest calculation burden. Two forms of the adaptive LPFT are proposed. The adaptive parameter in the first form is calculated for each radar chirp. An additional refinement is performed by using the information from the adjacent chirps. The second technique is based on the determination of the adaptive parameter for different parts of the radar image. The numerical analysis demonstrates the accuracy of the proposed techniques. It is important to note that the proposed technique does not assume any particular model of radar target motion. It can be applied for any realistic motion of targets.