基于近场散射模型的超低空目标雷达回波模拟  

Radar echo simulation of ultra-low altitude target based on near-field scattering model

作　　者：王童[1] 童创明[1] 王宜进 刘杰 WANG Tong;TONG Chuangming;WANG Yijin;LIU Jie(Air and Missile Defense College,Air Force Engineering University,Xi’an 710051,China;Unit 94782 of the PLA,Hangzhou 310021,China)

机构地区：[1]空军工程大学防空反导学院,陕西西安710051 [2]中国人民解放军94782部队,浙江杭州310021

出　　处：《系统工程与电子技术》2022年第1期139-145,共7页Systems Engineering and Electronics

基　　金：国家自然科学基金(61901510);陕西省自然科学基础研究计划(2021JQ-365)资助课题。

摘　　要：近区超低空目标具有更为复杂的电磁散射机理,需要建立更为精细灵活的回波模型。基于改进的物理光学与等效电磁流方法建立了目标的近场散射模型,结合面元模型与"四路径"模型提出环境与多径的近区散射计算方法。利用建立的电磁模型,以雷达导引头探测近区超低空目标为应用背景,建立了雷达回波信号模型。验证了近场电磁模型的有效性,仿真分析了信号带宽以及雷达与目标不同相对运动状态对回波信号的影响。仿真结果表明,回波模型较好地表现了复杂场景的各种散射机理,对于探索近区超低空目标回波的特征与规律具有理论意义与实用价值。The electromagnetic scattering mechanism of ultra-low altitude target in near zone is more complex, so it is necessary to establish a more accurate and flexible echo model. Based on the improved physical optics and method equivalent current, the target near-field scattering model is established. Combined with the facet model and “four path” model, the evaluated methods of near zone scattering contributions for environment and multipath are proposed. Using the proposed electromagnetic model, the radar echo signal model is established with the radar seeker detecting the ultra-low altitude target in the near zone as the background of the scene. The validity of the near-field electromagnetic model is verified, and the signal bandwidth and the influence of the relative motion state between the radar and the target on the echo signal are simulated and analyzed. Simulation results show that the echo model better represents various scattering mechanisms in complex scenes, and has theoretical significance and practical value for exploring the characteristics and laws of ultra-low altitude targets in the near zone.

关 键 词：超低空 近场 散射模型 雷达回波 

分 类 号：TN011[电子电信—物理电子学]