双层稀疏组Lasso高分辨SAR结构特征增强成像

doi:10.12305/j.issn.1001-506X.2021.02.09

Abstract

Abstract:

In synthetic aperture radar (SAR) imagery, the conventional convex optimization algorithms based on least absolute shrinkage and selection operator (Lasso shorted) may lead to the loss of structural features in weak scattering and affect the accuracy of the sparse signal recovery when sparsity enhancement is carried out. To solve this problem, a novel algorithm based on two-layer sparse group Lasso of alternating direction method of multipliers (SGL-ADMM) is proposed in this paper. Based on the block structure (group) feature of the scatterer as a prior, the proposed method firstly introduces the proximal operator corresponding to ℓ₁ norm according to the classified feature of the SAR data. Then, it realizes the sparse feature enhancement in the first-layer and second-layer SAR group by using the Gauss-Seidel strategy to perform dual iterative operation for the proximal operators in the ADMM framework. In addition, the ℓ_F norm in the mixed norm is the Gaussian penalty item, which can smooth the SAR echo data for realizing the enhanced structural features of SAR, accordingly. Therefore, the proposed algorithm can realize the joint enhancement of sparse feature and structure feature during echoed complex SAR data processing. In the experiments, the simulation data and the measured data of SAR, SAR ground moving target imaging (SAR-GMTIm) and inverse SAR are selected to compare the proposed algorithm with the traditional algorithm from the qualitative and quantitative perspectives. The phase transition diagram (PTD) method is used to verify the reconstruction ability of the proposed algorithm in the qualitative analysis, so as to verify the effectiveness and superiority of the proposed algorithm in SAR sparese and structural feature enhancement.

Key words: synthetic aperture radar (SAR), alternating direction method of multipliers (ADMM), structural feature enhancement, phase transition diagram (PTD)

CLC Number:

TN957.52

Lei YANG, Huijuan LI, Bo HUANG, Wei LIU, Pucheng LI. High resolution SAR imagery with structural feature enhancement under two-layer sparse group Lasso[J]. Systems Engineering and Electronics, 2021, 43(2): 351-362.

Figures/Tables 10

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参数	取值
发射信号带宽/GHz	1.5
脉冲重复频率/Hz	100
载波频率/GHz	10
目标转动角速度/(rad/s)	0.1
距离向分辨率/m	0.1
目标与雷达距离/km	50
方位向分辨率/m	0.3
雷达采样点数	50

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High resolution SAR imagery with structural feature enhancement under two-layer sparse group Lasso

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