基于改进MUSIC算法的散射中心参数提取及RCS重构

doi:10.3969/j.issn.1001-506X.2020.01.11

摘要/Abstract

摘要：

随着隐身技术的发展，雷达目标的边缘绕射等逐渐取代镜面散射成为主要的散射源，因此基于几何绕射理论（geometric theory of diffraction，GTD）的散射中心模型对隐身目标电磁散射特性的描述要比衰减指数和模型更为精确。显然，准确估计出GTD散射中心参数对刻画目标散射特性犹为重要。针对经典多重信号分类（multiple signal classification，MUSIC）法仅利用目标原始回波数据、参数估计精度不高这一问题，提出一种改进的MUSIC算法对散射参数估计提取。改进的MUSIC算法通过对原始回波数据取共轭，构建新的总协方差矩阵，有效利用了目标原始回波数据的共轭信息。仿真结果表明，与经典MUSIC算法相比，改进的MUSIC算法参数估计精度更高，雷达散射截面重构拟合程度更好，且运算量增加不大，可有效提取出隐身目标的散射中心。

关键词: 散射中心, 几何绕射理论, 改进多重信号分类算法, 共轭矩阵, 雷达散射截面重构

Abstract:

With the development of stealth technology, radar target edge diffraction gradually replaces mirror diffraction as the main scattering source. Therefore, the description of stealth targets based on the geometric theory of diffraction (GTD) scattering center model is more accurate than the damped exponential model. It is very important to accurately estimate the GTD scattering center parameters to characterize the scattering characteristics of the target. Aiming at the problem that the classical multiple signal classification (MUSIC) algorithm only uses the original echo data of the target and the accuracy of parameter estimation is not very high, an improved MUSIC algorithm is proposed to extract the scattering center parameters. By taking conjugate of original echo data, the improved MUSIC algorithm constructs a new total conjugate matrix, and makes effective use of conjugate information of target original echo data. Simulation results show that compared with the classical MUSIC algorithm, the improved MUSIC algorithm has a higher parameter estimation accuracy, better radar cross section (RCS) reconstruction fitting degree and little computational increase, which can effectively extract the scattering centers of stealth targets.

Key words: scattering center, geometric theory of diffraction (GTD), improved multiple signal classification (MUSIC) algorithm, conjugate matrix, radar cross section (RCS) reconstruction

中图分类号:

TN957

郑舒予, 张小宽, 宗彬锋. 基于改进MUSIC算法的散射中心参数提取及RCS重构[J]. 系统工程与电子技术, 2020, 42(1): 76-82.

Shuyu ZHENG, Xiaokuan ZHANG, Binfeng ZONG. Extraction of scattering center parameters and reconstruction of RCS based on improved MUSIC algorithm[J]. Systems Engineering and Electronics, 2020, 42(1): 76-82.

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典型散射结构	α取值
二面角、三面角、平面法向反射	1
单曲面反射、圆柱面反射	0.5
双曲面反射、球面反射	0
边缘绕射	-0.5
尖顶绕射	-1

序号	散射中心位置r_i/m	散射中心类型α_i	散射中心强度A_i
1	1.100	1.000	6.000
2	1.500	0.500	5.000
3	1.800	0	4.000
4	2.500	1.000	3.000

算法类型	数据预处理	特征值分解	谱峰搜索	单次计算时间/s
经典MUSIC	M²	P³	4I²M	0.444 068
改进MUSIC	5M²+2M³	P³	4I²M	0.682 687

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