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HUANG Jiajie, DONG Jingwen, LIU Chenyu, et al. Generalized relax-based multiband fusion method for SAR using an SASC model[J]. Journal of Radars, in press. doi: 10.12000/JR26036
Citation: HUANG Jiajie, DONG Jingwen, LIU Chenyu, et al. Generalized relax-based multiband fusion method for SAR using an SASC model[J]. Journal of Radars, in press. doi: 10.12000/JR26036
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Generalized RELAX-Based Multiband Fusion Method for SAR Using an SASC Model

DOI: 10.12000/JR26036 CSTR: 32380.14.JR26036
  • 1.

    the National Key Laboratory of Microwave Imaging, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100190, China

  • 2.

    the School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

  • 3.

    the Research Department of Cyber-electromagnetic Space Information Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, 100190, China

Funds:  The Major Scientific Research Instruments Development Project of the National Natural Science Foundation of China (No.62327806), The Strategic Priority Research Program of the Chinese Academy of Sciences (XDB0870203, XDB0870200, XDB0870000).
More Information
  • Corresponding author: LI Wangzhe, wzli@mail.ie.ac.cn
  • Received Date: 2026-01-30
    Available Online: 2026-04-02
    Abstract
  • Multiband fusion technology is essential for enhancing radar image resolution by overcoming the hardware bandwidth limits of radar systems. Compared with nonparametric approaches, parametric methods based on scattering models offer notable advantages in noise suppression and super-resolution imaging. However, models based on the geometric theory of diffraction (GTD) are inherently limited for analyzing scatterers with continuous structures, as GTD is an asymptotic high-frequency method suited primarily for discrete scattering centers. Consequently, it fails to adequately characterize the frequency response of such continuous scatterers. To address this issue, a multiband fusion method tailored for targets that can be sparsely represented by strong scattering centers is proposed. First, a simplified attributed scattering center (SASC) model is constructed, which improves the characterization of scattering properties by incorporating the influence of the scatterer length on the frequency spectrum. Second, to address the model order estimation problem, a modified maximum singular value difference criterion is introduced to robustly estimate the model order. Building on this, a generalized RELAX -based algorithm is designed to achieve high-precision parameter estimation for the SASC model, thereby enabling effective fusion of multiband signals. Experimental results demonstrate that the proposed algorithm achieves a 6.7-fold improvement in resolution relative to the single sub-band case, while preserving the clarity and integrity of the target structure.

     

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