雷达信号的电磁(EM)仿真对新体制雷达技术的研究具有重要价值。文中针对新体制同时极化雷达(SPR)回波信号开展EM 仿真,提出了快速仿真方法,并在此基础上进行了高分辨雷达成像。首先,利用FEKO 构建了雷达目标在4π空间里所有入射角度下的宽带全极化EM 散射数据库;接着,在推导SPR 目标回波信号模型的基础上,基于优化最小化方法以最小化互补积分旁瓣电平为准则设计了H、V 发射通道的正交互补序列波形。最后,根据实际雷达对目标的视角和频率范围以调用数据库的方式“装配”得到相应的雷达回波信号。为了进一步验证所提方法,该文以F22 模型为例开展了SPR 成像仿真实验,并通过Pauli 分解分析了幅相误差对目标极化散射特性测量的影响。

Electromagnetic (EM) simulation of radar signal is of great significance especially for the research of new mechanism radar systems. In this paper, a fast approach for EM echo simulation of simultaneously polarimetric radar (SPR) is proposed, based on which high-resolution radar imaging is conducted. Firstly, the wideband fully polarimetric EM scattering data was constructed base using FEKO software for a target under all incidences within 4π space. Then, the orthogonal complementary sequence waveforms are designed for the H and V transmission channels of SPR using majorization-minimization method to minimize the metric of complementary integral sidelobe level. Finally, the echo signals were assembled by calling the data base according to the specific angle and frequency ranges. To verify the proposed method, the F22 model is taken as the imaging target in the SPR simulation experiment, and the obtained fully polarimetric images were processed via Pauli decomposition, the influence from the imbalances of amplitude and phase between H and V channels was also analyzed.

TN957.1

国家自然科学基金资助项目(61971402)