Divergence factor correction of shooting and bouncing ray method for triangular meshed curved targets

Abstract

In this letter, the divergence factor (DF) correction is implemented in the shooting and bouncing ray method (SBR) to improve the accuracy of radar cross section (RCS) simulations of triangular meshed curved targets. Based on the surface fitting technique and differential geometry, the curvature information of the triangular surface mesh is reconstructed and the resulting DF of the wavefront is taken into account. For the diverging ray tube, a supersampling ray tracing method is proposed to address the ray-mesh resolution mismatch. This enables us to accurately find the illuminated region on the target surface. Meanwhile, the divergence coefficient is introduced to correct the incident field. The monostatic RCSs of some targets with curved structures are simulated. The simulation results validate the effectiveness of DF correction for SBR in improving the accuracy of RCS simulations of curved targets.

KEYWORDS:

• Shooting and bouncing ray method (SBR)
• radar cross section (RCS)
• divergence factor (DF)
• ray tracing

Acknowledgement

We would like to thank Prof. Bing Wei, Prof. Kuanfang Ren and Dr. Qingwei Duan for their guidance and valuable discussion!

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by China Postdoctoral Science Foundation: [Grant Numbers 2019M653548 and 2019M663928XB]; National Natural Science Foundation of China: [Grant Numbers 61901324 and 62001345]; Central University Basic Research Fund: [Grant Numbers JB200501, XJS200501, and XJS200507].