A robust autofocus approach, referred to as AUTOCLEAN (AUTOfocus via CLEAN), is proposed for the motion compensation in ISAR (inverse synthetic aperture radar) imaging of moving targets. It is a parametric algorithm based on a very flexible data model which takes into account arbitrary range migration and arbitrary phase errors across the synthetic aperture that may be induced by unwanted radial motion of the target as well as propagation or system instability. AUTOCLEAN can be classified as a multiple scatterer algorithm (MSA), but it differs considerably from other existing MSAs in several aspects: (1) dominant scatterers are selected automatically in the two-dimensional (2-D) image domain; (2) scatterers may not be well-isolated or very dominant; (3) phase and RCS (radar cross section) information from each selected scatterer are combined in an optimal way; and (4) the troublesome phase unwrapping step is avoided. AUTOCLEAN is computationally efficient and involves only a sequence of FFTs (fast Fourier transforms). Another good feature associated with AUTOCLEAN is that its performance can be progressively improved by assuming a larger number of dominant scatterers for the target. Hence it can be easily configured for real-time applications including, for example, ATR (automatic target recognition) of non-cooperative moving targets, and for some other applications where the image quality is of the major concern but not the computational time including, for example, for the development and maintenance of low observable aircraft. Numerical and experimental results have shown that AUTOCLEAN is a very robust autofocus tool for ISAR imaging.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Robust autofocus algorithm for ISAR imaging of moving targets


    Contributors:
    Li, Jian (author) / Wu, Renbiao (author) / Chen, V.C. (author)


    Publication date :

    2000


    Size :

    12 Seiten, 40 Quellen




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Robust autofocus algorithm for ISAR imaging of moving targets

    Li, Jian / Wu, Renbaio / Chen, V.C. | Tema Archive | 2001


    Robust autofocus algorithm for ISAR imaging of moving targets

    Jian Li, / Renbaio Wu, / Chen, V.C. | IEEE | 2001



    One-Dimensional ISAR Imaging of Multiple Moving Targets

    Zhu, Z. / She, Z. / IEEE; Dayton Section et al. | British Library Conference Proceedings | 1994


    Efficient ISAR autofocus via minimization of Tsallis Entropy

    Min-Seok Kang, / Ji-Hoon Bae, / Seong-Hyeon Lee, et al. | IEEE | 2016