Finally, to improve the accuracy, the author studies the double reflection between the patches of an object, and derives the formulas in PO_PO.
最后，为了提高计算精度，本文考虑了目标的各个面片之间二次散射的作用，推导了PO_PO法计算二次散射的公式。
参考来源 - 电大目标雷达散射截面的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
在互易原理的基础上，得到了计入相邻目标二次散射的散射场的积分表达式。
The integral expressions for scattered fields including the second-order scattering terms are given based on the reciprocity theorem.
结果表明埋藏在沙土中的导体球面不仅仅存在一次和二次散射波，而且还存在多次波和爬行波。
Results the calculation result shows that spherical surface of the conductor buried in sandy soil presents not only primary and secondary scattered waves but also multiple wave and creeping.
进一步的数值分析表明在讨论入射点附近的偏振特性时单次散射和二次散射近似模型具有很高的有效性。
Further quantitative analyses show that single scattering approximation and double scattering approximation are quite accurate when discussing the polarization patterns near the incident point.
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