船海复合场景面元化快速电磁建模方法及SAR成像仿真

在微波高频段,海面背景或海上船类目标往往具有电大尺寸和复杂精细的结构,这给船海复合场景的电磁建模带来巨大的计算负担。为简化计算,基于海面电磁散射模型面元化思想和图形电磁学,结合计算耦合场的四路径模型,提出一种电大尺寸船海复合场景电磁散射的快速计算方法。在保证海面与目标复合散射场的计算准确性前提下,提高计算效率。仿真并分析不同雷达参数下动态海面与目标的雷达散射截面,计算结果与实测数据以及精确数值方法结果的良好一致性验证了方法的准确性。将复合散射快速计算方法应用于合成孔径雷达成像仿真,仿真结果验证了方法的有效性。

Facet-based rapid electromagnetic modeling and SAR imaging for composite ship-sea scene

In the high frequency, sea surface or ship target usually possesses electrically-large size and very sophisticated structure, which imposes a huge computational burden for the electromagnetic modeling of the composite ship-sea scene. To simplify the calculation, based on the facet-model theory, the graphical electromagnetic computing method (GRECO) and the four path model, a hybrid method for the electromagnetic scattering computation of electrically-large composite ship-sea scene is presented. Under the precondition of guarantee calculation precision, the efficiency is improved obviously. The radar cross section (RCS) of time-varying sea surfaces and and ship target for different radar parameters are simulated and analyzed. The results show good agreement with the experimental data and accurate numerical results, which demonstrate the correctness of the method. Accordingly, application of the model to SAR imaging of marine scenes is finally developed. Simulation results demonstrate the effectiveness of the proposed method.