A modified ISAR cross-range scaling method based on iterative principle component analysis

• Main Authors: He, X. (Author), Liu, T. (Author), Tong, N. (Author)
• Format: Article
• Language: English
• Published: John Wiley and Sons Inc 2021
• Subjects: Cross ranges; Electromagnetic image; High resolution; Inverse problems; Inverse synthetic aperture radar; Inverse synthetic aperture radar images; Iterative methods; Principal component analysis; Principle components analysis; Radar imaging; Rotation angles; Rotational velocity; Scaling method; Synthetic aperture radar imaging; Target detection and recognition
• Online Access: View Fulltext in Publisher

 High-resolution inverse synthetic aperture radar (ISAR) imaging can produce electromagnetic images of a target in the range and cross-range domain. However, to make full use of an ISAR image in target detection and recognition, we need to rescale the image in a homogeneous range and cross-range domain, and further, to estimate the effective rotational velocity (RV) of the target. A precise ISAR image cross-range scaling method is proposed. A candidate RV is obtained based on the bisection method. Then, the effective rotation angle (RA) between two sequential rescaled images is characterised by the RA between the major axes of the images. These axes are extracted by principle component analysis (PCA). A precise estimation of the RV is obtained through iterative PCA and bisection. Simulated and real data experimental results validate the effectiveness of the proposed method. © 2021 The Authors. IET Signal Processing published by John Wiley & Sons Ltd on behalf of The Institution of Engineering and Technology.