基于IRLS的跳频模式下GTD散射参数提取和RCS重构

doi:10.12305/j.issn.1001-506X.2023.03.08

Abstract

Abstract:

Modern spectral estimation methods can extract the scattering parameters based on the geometric theory of diffraction (GTD) model, but they cannot deal with non-uniform and incomplete radar cross section (RCS) data. Furthermore, obtaining complete RCS data in anechoic chambers requires large space-time cost. To solve these problems, an iteratively reweighed least squares (IRLS)-based method for GTD scattering parameter extraction and RCS reconstruction in frequency hopping mode is proposed. Combining the sparse reconstruction theory with the GTD scattering model, the proposed method can retrieve scattering parameters and realize RCS reconstruction under the condition of non-uniform and incomplete RCS data. Simulation data and electromagnetic calculation data are used to verify the effectiveness of the proposed method. And the experimental results indicate that the proposed method is significant to reduce the cost of stepped-frequency RCS measurement in anechoic chambers and expand RCS data in database.

Key words: radar cross section (RCS) reconstruction, scattering parameter extraction, geometric theory of diffraction (GTD) model, frequency hopping mode, iteratively reweighed least squares (IRLS) algorithm

CLC Number:

TP957

Yingjun LI, Yongxiang LIU, Biao TIAN, Wenpeng ZHANG. GTD scattering parameter extraction and RCS reconstruction in frequency hopping mode based on IRLS[J]. Systems Engineering and Electronics, 2023, 45(3): 678-689.

Figures/Tables 17

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典型散射类型	α取值
二面角反射、三面角反射、平板反射	1
单曲面反射、圆柱面反射	0.5
点散射、双曲面反射	0
边缘绕射	-0.5
尖顶绕射	-1

散射中心	r/m	A	α
S1	2.700	0.38+0i	0.5
S2	4.125	1+0i	0
S3	4.237 5	0.586+0i	0.5
S4	4.950	0.414+0i	1

稀疏度ρ/%	散射中心	r/m	A	α
100.0	S1	2.700 0	0.380 4-0.001 4i	0.500 0
	S2	4.128 5	0.992 2-0.002 4i	0.020 0
	S3	4.236 8	0.577 4+0.015 0i	0.480 0
	S4	4.950 0	0.413 6-0.000 5i	1.000 0
50.0	S1	2.700 0	0.378 7+0.000 0i	0.500 0
	S2	4.125 1	1.005 4-0.002 9i	0.020 0
	S3	4.238 3	0.576 3-0.007 6i	0.531 3
	S4	4.950 0	0.414 4-0.002 0i	1.000 0

[1]	Shangsheng LI, Xukun WANG, Zhequan FU, Juntao ZHANG. Extraction of scattering center parameter and RCS reconstruction based on the improved TLS-ESPRIT algorithm of Hankel matrix [J]. Systems Engineering and Electronics, 2021, 43(1): 62-73.
[2]	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.
[3]	WANG Xin, DONG Chun-zhu, YIN Hong-cheng. Parameter estimation of GTD model combining RELAX and PSO [J]. Journal of Systems Engineering and Electronics, 2011, 33(6): 1221-1225.

GTD scattering parameter extraction and RCS reconstruction in frequency hopping mode based on IRLS

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