Abstract:

The traditional shooting and bouncing rays (SBR) technique usually utilizes the small uniform ray tube for ray tracing, where a great number of rays need to be dealt with while calculating the multiple reflections for electrically large complex targets, therefore, the calculation efficiency is greatly reduced to restrict the applications. A novel adaptive ray tube splitting algorithm (ARTSA) based on the complex target’s triangle irregular network (TIN) model is presented. Firstly, the information of TIN model is used to generate non-uniform optimized initial ray tubes dynamically. After making the ray tube intersection, polygon clipping and triangularization operation, each initial ray tube is split to a certain number of sub ray tubes. Eventually, the multi-reflection contributions of complex objects are gained via the coherent superposition of all sub-ray-tube contributions calculated by aperture integral (AI). Compared with the traditional SBR technique, the proposed algorithm could reduce the number of rays greatly and enhance the efficiency of multi-reflection calculation observably with the same calculation precision.