射线跟踪法的改进及其应用

研究复杂组合体目标后向散射场问题，并对射线跟踪法的典型算法进行改进，以提高计算精度和运算速度。推导精确的积分公式，用典型体目标对改进的算法进行验证，进而计算复杂组合体目标的后向散射场。矩形截面直进气道的计算结果不仅比学者Hao Ling的计算结果更为精确，而且计算速度提高了两倍。三面角反射器的计算结果与实验结果基本吻合。最后，计算了某型航母甲板上复杂目标组合体目标的RCS，并与近似法和像素法的计算结果进行了比较分析。

Improvement of SBR and RCS Calculation of Complex Combination Objects Using SBR

The radar cross section (RCS) of complex combination objects is studied and the typical algorithm of shooting and bouncing ray (SBR) is improved to enhance the speed and accuracy of computation. Aperture integration formulae are derivated and the improved algorithm is proved with a typical body. Then RCS of complex combination objects is computed. The calculated results of a strait inlet with the rectangular section are in agreement with reference values than those of Hao Ling, furthermore the speed of calculation increases two times. The calculated results of trihedral corner reflectors agree with the experimental results. Finally, the computed results of complex combination objects on the deck of a aircraft carrier are given and compared with the results calculated by the approximation and the pixel methods.