| Citation: | LI Yaoyao, SU Donglin, LIU Yan, et al. Convex surface ray tracing based on adaptive cutting surface adjustment under exact normal vector[J]. Journal of Beijing University of Aeronautics and Astronautics, 2016, 42(12): 2632-2639. doi: 10.13700/j.bh.1001-5965.2016.0442(in Chinese)
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Electrical large targets are difficult to be accurately and analytically expressed and thus it is difficult to use uniform geometrical theory of diffraction (UTD) method for field computation. Aimed at this problem, a novel creeping ray triangular mesh tracing (TM-tracing) algorithm for arbitrary convex surface was proposed. Based on practical engineering triangular mesh and its protocol, a net-like triangular mesh data storage list which meets the rapid multilateral search criteria was designed. A high accuracy normal vector algorithm was proposed to satisfy the tracing requirement. Then a dynamic adjustment of the arc cutting surface fitting tracing method was proposed to realize creeping wave tracing algorithm. Finally, combined with UTD, shadow field value solving algorithm was realized. Aircraft-based ray tracing results show that TM-tracing algorithm can be applied to arbitrary smooth convex surfaces including sphere, cylinder and cone. Tracing speed is 2.8 seconds and deviation is less than 1.61%. It shows that the proposed algorithm has an application value in engineering.
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