稀薄大气中箔条的雷达干扰特性研究
发布时间：2018-10-23 08:51
【摘要】：箔条作为历史最悠久的无源干扰措施之一,被逐步移至弹道中段这一崭新的战场环境中。为充分发挥箔条在弹道中段的干扰效果,迫切需要了解其在稀薄大气中的相关特性。论文对弹道中段箔条的运动扩散、电磁散射、电波传播等基本特性、箔条干扰的一维高分辨距离成像特性以及基于箔条云散射特征的有源转发干扰特性进行了探讨,并通过仿真简单评估了干扰效果,提出了干扰技术建议。论文的主要内容包括三个部分:第一部分是总结箔条云的基本特性。结合弹头弹道轨迹、综合考虑箔条抛撒位置的大气环境,首先对箔条抛撒后的初始指向分布及运动扩散特性进行了分析,并根据相干合成原理,由单根箔条散射特性得到整个箔条云团的雷达散射特性。然后基于箔条的前向和后向散射理论,给出了不同极化条件下均匀分布箔条的等效传播常数,最终得到在箔条介质中传播的电磁波衰减特性。第二部分是探讨箔条云干扰的一维高分辨距离成像特性。以箔条散射特性为基础,结合一维距离像成像理论,通过仿真得到了稀薄大气中随机分布箔条在不同抛撒方式、不同指向等情况下的一维高分辨距离成像特性。第三部分是分析基于箔条云散射特征的有源转发干扰特性。提出一种将实施有源转发的干扰机与无源箔条相融合的干扰手段,论文首先从功率角度对这种基于箔条云散射特征的有源转发干扰进行了可行性分析。然后基于线性调频信号的转发干扰模型,通过仿真分析了雷达信号经干扰机直接转发和简单调制后转发这两种情况下,再经箔条云反射的干扰回波特性。
[Abstract]:Chaff, as one of the oldest passive jamming measures, has been gradually moved into the new battlefield environment. In order to give full play to the jamming effect of chaff in the middle of trajectory, it is urgent to understand the relevant characteristics of chaff in the rarefied atmosphere. In this paper, the basic characteristics of chaff such as motion diffusion, electromagnetic scattering, electric wave propagation, one-dimensional high-resolution range imaging of chaff interference and active forward jamming based on chaff cloud scattering are discussed. The jamming effect is evaluated simply by simulation, and some technical suggestions are put forward. The main contents of the thesis include three parts: the first part is to summarize the basic characteristics of chaff cloud. Combined with warhead trajectory and considering the atmospheric environment of chaff throwing position, the initial direction distribution and motion diffusion characteristics of chaff are analyzed firstly, and according to the principle of coherent combination, the initial direction distribution and motion diffusion characteristics of chaff are analyzed. The radar scattering characteristics of the whole chaff cloud are obtained from the scattering characteristics of a single chaff. Then, based on the forward and backward scattering theory of chaff, the equivalent propagation constants of chaff with uniform distribution under different polarization conditions are given, and the attenuation characteristics of electromagnetic wave propagating in chaff medium are obtained. In the second part, we discuss the one-dimensional high-resolution range imaging characteristics of chaff cloud interference. Based on the scattering characteristics of chaff and the imaging theory of one-dimensional range profile, the one-dimensional high-resolution range imaging characteristics of the randomly distributed chaff in rarefied atmosphere under different scattering modes and different directions are obtained by simulation. In the third part, the characteristics of active forward jamming based on chaff cloud scattering feature are analyzed. In this paper, a jamming method which combines the active repeater and passive chaff is proposed. Firstly, the feasibility of the active forward jamming based on chaff cloud scattering feature is analyzed from the power point of view. Then, based on the forward jamming model of LFM signal, the characteristics of jamming echo reflected by chaff cloud are analyzed by simulation.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN974
[Abstract]:Chaff, as one of the oldest passive jamming measures, has been gradually moved into the new battlefield environment. In order to give full play to the jamming effect of chaff in the middle of trajectory, it is urgent to understand the relevant characteristics of chaff in the rarefied atmosphere. In this paper, the basic characteristics of chaff such as motion diffusion, electromagnetic scattering, electric wave propagation, one-dimensional high-resolution range imaging of chaff interference and active forward jamming based on chaff cloud scattering are discussed. The jamming effect is evaluated simply by simulation, and some technical suggestions are put forward. The main contents of the thesis include three parts: the first part is to summarize the basic characteristics of chaff cloud. Combined with warhead trajectory and considering the atmospheric environment of chaff throwing position, the initial direction distribution and motion diffusion characteristics of chaff are analyzed firstly, and according to the principle of coherent combination, the initial direction distribution and motion diffusion characteristics of chaff are analyzed. The radar scattering characteristics of the whole chaff cloud are obtained from the scattering characteristics of a single chaff. Then, based on the forward and backward scattering theory of chaff, the equivalent propagation constants of chaff with uniform distribution under different polarization conditions are given, and the attenuation characteristics of electromagnetic wave propagating in chaff medium are obtained. In the second part, we discuss the one-dimensional high-resolution range imaging characteristics of chaff cloud interference. Based on the scattering characteristics of chaff and the imaging theory of one-dimensional range profile, the one-dimensional high-resolution range imaging characteristics of the randomly distributed chaff in rarefied atmosphere under different scattering modes and different directions are obtained by simulation. In the third part, the characteristics of active forward jamming based on chaff cloud scattering feature are analyzed. In this paper, a jamming method which combines the active repeater and passive chaff is proposed. Firstly, the feasibility of the active forward jamming based on chaff cloud scattering feature is analyzed from the power point of view. Then, based on the forward jamming model of LFM signal, the characteristics of jamming echo reflected by chaff cloud are analyzed by simulation.
【学位授予单位】：国防科学技术大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN974
【参考文献】
相关期刊论文 前10条
1 黄琅，
本文编号：2288740
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