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温珊, 王俊义, 劳保强. 改进的射电干涉成像凸优化算法[J]. 桂林电子科技大学学报, 2019, 39(1): 54-60.
引用本文: 温珊, 王俊义, 劳保强. 改进的射电干涉成像凸优化算法[J]. 桂林电子科技大学学报, 2019, 39(1): 54-60.
WEN Shan, WANG Junyi, LAO Baoqiang. An improved convex optimisation algorithm for radio-interferometric imaging[J]. Journal of Guilin University of Electronic Technology, 2019, 39(1): 54-60.
Citation: WEN Shan, WANG Junyi, LAO Baoqiang. An improved convex optimisation algorithm for radio-interferometric imaging[J]. Journal of Guilin University of Electronic Technology, 2019, 39(1): 54-60.

改进的射电干涉成像凸优化算法

An improved convex optimisation algorithm for radio-interferometric imaging

  • 摘要: 针对射电干涉成像中产生的凸优化任务,提出了一种改进的射电干涉成像凸优化算法。基于ADMM算法高度可并行化的结构,依靠前后向迭代解的相关性,在每次迭代算法正向(梯度)步骤中提出一种新的有效加权方案以提高每次重构的精确性。该设计对后向步骤复原结果引入二次加权更新。更新方程取决于前两个复原结果估计,而非是当前值。改进后的算法不仅可以保持与ADMM相同的并行实现结构和相同的计算负担,而且可以实现更好的噪声图像重建。实验仿真表明,改进的方法在信噪比和视觉质量均优于先进的成像方法。

     

    Abstract: For the convex optimization task generated in radio interference imaging, an improved convex optimization algorithm for radio interference imaging is proposed. Building on the highly parallelizable structure of the ADMM algorithm, a novel influence measure by taking into account correlation of front-back iterative solution is proposed, the weight solution in the forward (gradient) step of algorithm, to improve the accuracy of each reconstruction in each iteration. The design introduces a second-weighted update for solution in the forward (gradient) step of ADMM. The update equation depends on the two previous estimates, rather than only on the previous one. The improved algorithm not only can maintain parallel implementation structure and the same computational burden as ADMM, but also can achieve better reconstruction of noisy images. The simulations show that the proposed approach outperforms state-of-the-art imaging methods, both in terms of SNR and visual quality.

     

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