基于GTD模型的多视角多频带ISAR融合成像

doi:10.12305/j.issn.1001-506X.2023.03.13

Abstract

Abstract:

Multi-angle and multi-band inverse synthetic aperture radar (ISAR) fusion imaging technology can overcome the limitation of the imaging resolution by the transmitting bandwidth and the observation angle in a monostatic radar system. It is a new method to improve the two-dimensional resolution of ISAR imaging. Under the condition of wide-bandwidth and small-angle observation, the scattering coefficients of target vary with frequency. A multi-angle and multi-band ISAR fusion imaging method based on the geometrical theory of diffraction (GTD) model is proposed. First, the ISAR imaging signal model is established based on the GTD model. Then, the multi-angle and multi-band ISAR fusion imaging problem is transformed into a signal sparse reconstruction problem. Orthogonal matching pursuit (OMP) algorithm is utilized to reconstruct the signal and achieve ISAR fusion imaging. The algorithm can improve the imaging efficiency while ensuring the ISAR fusion imaging quality. Finally, simulation experiments are utilized to verify the effectiveness of the proposed method.

Key words: inverse synthetic aperture radar (ISAR) imaging, geometrical theory of diffraction (GTD) model, multi-angle and multi-band fusion imaging, orthogonal matching pursuit (OMP) algorithm

CLC Number:

Xiaoxiu ZHU, Limin LIU, Wenhua HU, Baofeng GUO, Lin SHI, Hanshen ZHU. Multi-angle and multi-band ISAR fusion imaging based on GTD model[J]. Systems Engineering and Electronics, 2023, 45(3): 726-735.

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References 30

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散射点类型	频率依赖因子
平面反射	1
单曲面反射	0.5
点散射中心	0
边缘绕射	-0.5
角绕射	-1

参数	散射点
参数	算法	A	B
坐标/m	正则化算法	(-0.12, -0.15)	(0.12, 0.05)
坐标/m	OMP算法	(-0.12, -0.10)	(0.12, 0.10)
频率依赖因子	正则化算法	0.5	-1
频率依赖因子	OMP算法	0.5	-1

指标	算法	情形1	情形2	情形3
运行时间/s	正则化算法	1 513.71	1 258.78	975.53
运行时间/s	OMP算法	7.48	4.78	3.39
IC	正则化算法	7.565 8	6.875 3	5.708 4
IC	OMP算法	8.453 6	8.190 3	7.674 5
TBR	正则化算法	25.534 6	21.270 3	16.045 2
TBR	OMP算法	28.453 2	24.944 2	20.956 4

指标	算法	SNR/dB
指标	算法	20	10	0
IC	正则化算法	6.875 3	6.023 4	5.101 2
IC	OMP算法	8.190 3	7.424 3	6.682 3
TBR	正则化算法	21.270 3	18.302 3	15.049 2
TBR	OMP算法	24.944 2	22.538 2	20.349 2

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Multi-angle and multi-band ISAR fusion imaging based on GTD model

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