Effelsberg-Bonn HI调查(EBHIS)的RFI缓解措施
RFI mitigation for the Effelsberg-Bonn HI Survey (EBHIS)
摘要:
在100米望远镜上的一个新的L波段7馈源阵列被用来对整个北半球进行无偏的、完全抽样的HI调查--Effelsberg-Bonn HI调查(EBHIS)。使用基于FPGA的最先进的数字快速傅里叶变换光谱仪-动态范围优越并允许快速转储光谱-使应用复杂的RFI缓解方案成为可能。根据目前的调查状况,我们讨论了RFI的情况下,在100米望远镜,并提出了一种快速算法,自动识别RFI的原始数据输出的光谱仪。使用模拟,我们表明,它是可行的,以检测超过95%的所有RFI超过1西格玛振幅小于1%的误报。
英文摘要:
A new L-band 7 feed array at the 100-m telescope is used to perform an unbiased, fully sampled HI survey of the whole northern hemisphere - the Effelsberg-Bonn HI Survey (EBHIS). The use of state-of-the-art digital Fast Fourier Transform spectrometers based on FPGAs - superior in dynamic range and allowing fast dumping of spectra - makes it possible to apply sophisticated RFI mitigation schemes. Based on the current status of the survey we discuss the RFI situation at the 100-m telescope and present a fast algorithm to automatically identify RFI in the raw data output from the spectrometer. Using simulations we show that it is feasible to detect more than 95% of all RFI in excess of 1 sigma amplitude with less than 1% false positives.
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