海背景下箔条云电磁散射研究  

Electromagnetic scattering simulation from a chaff cloud above the ocean

作　　者：郑文静 何姿[1] 丁大志[1] ZHENG Wenjing;HE Zi;DING Dazhi(Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学,南京210094

出　　处：《电波科学学报》2025年第1期46-57,共12页Chinese Journal of Radio Science

基　　金：国家自然科学基金(61931021,62322107)。

摘　　要：箔条是一种常见的无源干扰方式,主要用于干扰雷达系统的探测。当雷达信号碰到箔条时会产生强烈的散射,在雷达接收端产生伪目标或回波云,干扰雷达对真实目标的探测和跟踪。针对低空环境下箔条云的电磁散射会受海面反射和多路径效应影响的问题,本文提出了海面上空箔条云电磁散射仿真模型,重点分析了箔条云与海面之间的耦合效应对电磁散射的影响。利用四路径理论考虑箔条云与粗糙海面之间的多重散射效应,针对高密度箔条云的散射特性,利用矢量辐射传输方法结合蒙特卡罗求解器模拟光子在箔条云和海面之间散射时的能量变化。考虑海面相关的耦合过程和海面散射部分,采用改进的积分方程模型快速计算多种海况下海面电磁散射贡献。利用多层快速多极子方法有效验证了不同频率和不同箔条间隔下本文方法的准确性。本文还模拟了不同海况和高度下箔条云散射雷达截面积的动态变化,进一步分析了不同空间分布的箔条云对电磁散射特性的影响。这些研究为实际应用中的箔条云散射特性分析提供了有力支持。Chaff can generate pseudo-targets at radar receivers,interfering with the detection and tracking of real targets.This paper proposes an electromagnetic(EM)scattering simulation model to address the scattering characteristics of chaff clouds in a low-altitude ocean environment.The study analyzes the influence of coupling effects between the chaff cloud and the sea surface on EM scattering.To account for multiple scattering effects comprehensively,the four-path theory is employed to model interactions between the chaff cloud and the sea surface.For regions with high-density chaff clouds,the vector radiative transfer method is applied to simulate energy redistribution and internal coupling effects within the cloud.Furthermore,an advanced integral equation model is utilized to accurately compute the EM scattering contributions of the sea surface under various sea conditions.Numerical methods are used to validate the accuracy of the simulation results.Additionally,the paper examines the scattering behavior of chaff clouds above the sea surface across a range of scenarios.

关 键 词：海面 箔条云 耦合散射 四路径理论 解析方法 

分 类 号：TN959.7[电子电信—信号与信息处理]