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

Abstract

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

CLC Number:

TN957

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.

Figures/Tables 11

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References 27

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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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Extraction of scattering center parameters and reconstruction of RCS based on improved MUSIC algorithm

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