Adaptive weighting in radio interferometric imaging

作者：Yatawatta S^*

来源：Monthly Notices of the Royal Astronomical Society, 2014, 444(1): 790-796.

DOI：10.1093/mnras/stu1494

• instrumentation: interferometers
• methods: numerical
• techniques: interferometric

Radio interferometers observe the Fourier space of the sky, at locations determined by the array geometry. Before a real space image is constructed by a Fourier transform, the data are weighted to improve the quality of reconstruction. Two criteria for calculation of weights are maximizing sensitivity and minimizing point spread PSF) sidelobe levels. In this paper, we propose a novel weighting scheme suitable for ultradeep imaging experiments. The proposed weighting scheme is used to maximize sensitivity while minimizing PSF sidelobe variation across frequency and multiple epochs. We give simulation results that show the superiority of the proposed scheme compared with commonly used weighting schemes in achieving these objectives.

• 出版日期2014-10-11