论文标题
快速的基线校正算法
A baseline correction algorithm for FAST
论文作者
论文摘要
五百米的光圈球形射电望远镜（快速）是地球上最敏感的地面射电望远镜。但是，FAST生产的原始HI光谱受到直播的影响。为了最大程度地提高快速观测的快速功能，我们提出了一种结合快速傅立叶变换和极端信封曲线的算法，以自动纠正快速HI光谱的基线并从基准中删除站立波。该算法可以将静波引起的放大噪声水平降低到近乎理想的水平，而不会丢失信号或引入假信号。平均基线的均方根达到$ \ sim $ 8 MK，接近Fast产生的HI频谱的理论灵敏度，在整合时间为335分钟，即$ \ sim $ 6 mk。
The Five-hundred-meter Aperture Spherical radio Telescope (FAST) is the most sensitive ground-based, single-dish radio telescope on Earth. However, the original HI spectra produced by FAST are affected by standing waves. To maximize the power of FAST for high-sensitivity observations, we proposed an algorithm that combines fast Fourier transforms and extreme envelope curves to automatically correct the baselines of FAST HI spectra and remove standing waves from the baselines. This algorithm can reduce the amplified noise level caused by standing waves to a near-ideal level without losing signals or introducing false signals. The root mean square of the average baseline reaches $\sim$ 8 mK, approaching the theoretical sensitivity of an HI spectrum produced by FAST for an integration time of 335 minutes, i.e., $\sim$ 6 mK.
