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arXiv 0906.0537astro-ph.IM
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低射频下的校准和成像挑战:最新技术概述

Calibration and imaging challenges at low radio frequencies: An overview of the state of the art

S. Bhatnagar

摘要:

下一代低频射电望远镜的许多科学成果需要高动态范围成像。正在建设中的下一代望远镜确实承诺与现有望远镜相比,灵敏度至少增加10倍。在这些望远镜的图像中,投影的可实现RMS噪声在1- 10 $μ$ μ y/光束的范围内,对应于$10^{6-7}$的典型成像动态范围。高的成像动态范围要求去除系统误差以达到高精度和长的积分间隔。一般来说,许多误差来源是方向性的,除非得到纠正,否则将成为这些下一代望远镜成像动态范围的限制因素。这需要开发用于校准和成像的新算法和软件,其可以校正这种方向和时间相关误差。在本文中,我将讨论由此产生的算法和计算的挑战和最近取得的进展,以解决这些挑战。

英文摘要:

Many scientific deliverables of the next generation low frequency radio telescopes require high dynamic range imaging. Next generation telescopes under construction indeed promise at least a ten-fold increase in the sensitivity compared with existing telescopes. The projected achievable RMS noise in the images from these telescopes is in the range of 1--10$μ$Jy/beam corresponding to typical imaging dynamic ranges of $10^{6-7}$. High imaging dynamic range require removal of systematic errors to high accuracy and for long integration intervals. In general, many source of errors are directionally dependent and unless corrected for, will be a limiting factor for the imaging dynamic range of these next generation telescopes. This requires development of new algorithms and software for calibration and imaging which can correct for such direction and time dependent errors. In this paper, I discuss the resulting algorithmic and computing challenges and the recent progress made towards addressing these challenges.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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