Bi-Directional Ray Tracing Enhanced Automatic Forward Parametric Scattering Model for Complex Coated Structure

This is the authors' abstract. We don't add key points for this paper.

This article presents an accurate automatic forward parametric scattering model with bi-directional ray tracing (BRT) and attribute scattering center (ASC) for complex coated structure. The model can accurately reconstruct the radar cross section (RCS) characteristics and the synthetic aperture radar (SAR) image signatures of targets. Compared with conventional unidirectional ray tracing, higher order scattering types can be obtained through the BRT method. An automatic recognition module for frequency-dependent parameters has been developed based on general equations corresponding to different geometric surface shapes, thereby avoiding cumbersome manual intervention. The reconstructed SAR images utilizing the proposed model exhibit high similarity, surpassing 0.83, compared to those from actual measurements or multilevel fast multipole algorithm (MLFMA). The effectiveness and accuracy of the proposed model are validated through these reconstructed results. Finally, the practicality of the proposed model is demonstrated with a couple of examples.