arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.02319eess.SP
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基于一致性ADMM的分布式雷达成像

Widely-distributed Radar Imaging Based on Consensus ADMM

Ruizhi Hu, Bhavani Shankar Mysore Rama Rao, Ahmed Murtada, Mohammad Alaee-Kerahroodi, Björn Ottersten

摘要:

宽分布雷达系统是提高雷达成像性能的一种很有前途的体系结构。然而,现有的算法大多依赖于各向同性散射假设,这是只满足共置雷达系统。此外,由于噪声和成像模型的不完善性,在雷达图像中常见的伪影,如停留。提出了一种新的基于$l_1$ -正则化、一致性交替方向乘子法(CADMM)的算法,通过利用宽分布雷达系统的空间分集来消除伪影。通过对分布式天线簇形成的局部图像施加一致性约束,并求解由此产生的分布式优化问题,保留了场景的空间不变的共同特征。同时,空间变化的伪影被减轻,并且它最终将在所有分布式测量的共识中收敛到高质量的全局图像。该算法优于联合稀疏合成成像(JSC)算法的伪影抑制。它还可以减少计算和存储负担的大规模成像问题,通过其分布式和并行化的优化方案。

英文摘要:

A widely-distributed radar system is a promising architecture to enhance radar imaging performance. However, most existing algorithms rely on isotropic scattering assumption, which is only satisfied in collocated radar systems. Moreover, due to noise and imaging model imperfections, artifacts such as layovers are common in radar images. In this paper, a novel $l_1$-regularized, consensus alternating direction method of multipliers (CADMM) based algorithm is proposed to mitigate artifacts by exploiting a widely-distributed radar system's spatial diversity. By imposing the consensus constraints on the local images formed by distributed antenna clusters and solving the resulting distributed optimization problem, the scenario's spatial-invariant common features are retained. Simultaneously, the spatial-variant artifacts are mitigated, and it will finally converge to a high-quality global image in the consensus of all distributed measurements. The proposed algorithm outperforms the joint sparsity-based composite imaging (JSC) algorithm in terms of artifacts mitigation. It can also reduce the computation and storage burden of large-scale imaging problems through its distributed and parallelizable optimization scheme.

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