StEFCal — An Alternating Direction Implicit method for fast full polarization array calibration
StEFCal — An Alternating Direction Implicit method for fast full polarization array calibration
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StEFCal — 一种用于快速全偏振阵列校准的交替方向隐式方法
DOI：
10.1109/ursigass.2014.6930038
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
S. Wijnholds
中科院分区：
文献类型：
--
作者：
S. Salvini;S. Wijnholds
交替方向隐式（ADI）方法提供了一种计算效率高的方法来解决全极化中基于天线的增益。在本文中，我们分析了这种方法在模拟的收敛性。我们表明，收敛的基本实现可以是相当缓慢的，我们提出了两种形式的放松，以提高收敛行为。该算法可以被证明是统计上有效的低信噪比的情况下，这使得这种方法特别适合于大型射电天文阵列，如平方公里阵列（SKA）的校准。这也导致了统计效率和快速校准（StEFCal）的名称。该算法在低频阵列（LOFAR）校准流水线的几个阶段中实现。我们报告在此管道中使用StEFCal实现的校准性能改进。
Alternating Direction Implicit (ADI) methods provide a computationally efficient way to solve for antenna based gains in full polarization. In this paper, we analyze the convergence of such methods in simulations. We show that convergence of a basic implementation can be quite slow and we propose two forms of relaxation to improve convergence behavior. The algorithm can be shown to be statistically efficient in low-SNR scenarios, which makes this approach particularly suitable for calibration of large radio astronomical arrays like the Square Kilometre Array (SKA). This also led to the name Statistically Efficient and Fast Calibration (StEFCal). The algorithm was implemented in several stages of the Low Frequency Array (LOFAR) calibration pipeline. We report on calibration performance improvement achieved with StEFCal in this pipeline.
影响因子：
6.5
作者：
van Haarlem, M. P.;Wise, M. W.;van Zwieten, J.
通讯作者：
van Zwieten, J.