采用扩展传播内层展开结合前后向迭代法(EPILE+FBM)、扩展传播内层展开结合广义前后向迭代法(EPILE+GFBM)研究粗糙地海面与多目标复合电磁散射问题。对粗糙地海面与多目标的多类复合场景进行合理建模，建立复合散射多个积分方程和散射场及系数的表达式，对算法的准确度、复杂度、计算效率等性能进行探讨，研究不同入射角、不同频率、不同目标位置和姿态、以及不同粗糙度等参数时的粗糙地海面与多目标复合电磁散射，并对其典型特征进行分析。在理解粗糙面与多目标耦合散射机理基础上，有望提出改善复合散射分析的可行性措施与杂波提取及目标制导的规律性认识。

Applying the Extended Propagation-Inside-Layer Expansion combined with the Forward-Backward Method (EPILE+FBM)and the Extended Propagation-Inside-Layer Expansion combined with the Generalized Forward-Backward Method (EPILE+GFBM), the composite electromagnetic scattering problem from rough ground /sea surface and multi-targets will be researched. The multiple composite sense of rough ground / sea surface and multi-targets will be modeled reasonably, the expressions of integral equation, scattering field and coefficient will be built, the accuracy, complexity and computational efficiency for the algorithms will be discussed, the results of the rough ground / sea surface and multi-targets composite scattering under different incident angle, different frequency, different target position and posture, and different roughness, etc, will be investigated, and the typical characteristic will be analysed. Basing on the understanding of coupling scattering mechanism from the rough surface and multiple targets, we respect to propose the feasible measure in improving the analysis of composite scattering and the understanding of regularity on clutter extacting and target guidance.