Methods and applications of Radio Frequency Interference surveys for radio astronomy in Malaysia

Abidin, Zamri Zainal; Ibrahim, Zainol Abidin; Rosli, Zulfazli; Hassan, Sobia; Malim, S. F. F.; Noorazlan, Noorkhallaf; Aziz, MohamadAzwan; Suhaimi, Anwar

doi:10.1109/iconspace.2011.6015878

Cited by 4 publications

(3 citation statements)

References 3 publications

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“…'LNO' was found as the best site of low radio environment level with kurtosis value above 10 in the wide band [14]. At the same time, it was also observed that low-density population and distant location from urban area contributed to the low in RFI at 'LNO' in the wide band.…”

Section: Methodsmentioning

confidence: 76%

“…The measured radio environment spectrum level then was analyzed by plotting a graph of power level against frequency for the wide and HI band in order to observe the radio environment level between three selected sites. The data is further analyzed by presenting the kurtosis value from the data and supported by averaging the radio environment spectrum at each site in HI band in order to compare with sites which have low RFI This kurtosis value such as 'indicator' of radio environment level was used in this analysis at many sites as referred to [14]. The highest in kurtosis value obtained indicates the lowest radio environment level.…”

Section: Methodsmentioning

confidence: 99%

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Determination of Radio Environmental Level in Hydrogen (HI) Band Spectrum by using Kurtosis Analysis

Zafar¹,

Umar²,

Sabri³

et al. 2017

International Journal on Advanced Science, Engineering and Information Technology

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The Radio Frequency Interference (RFI) nowadays becomes a serious problem and crucial issue in the radio astronomy observation. The radio astronomical lines observation become worse due to the more RFI in Ultra High Frequency (UHF) and Very High Frequency (VHF) which influences the data in radio image. The aims of this paper are to investigate the radio environment level in hydrogen (HI) band (1300-1500MHz) and also in a wide band (0-9000 MHz). The observation site is at KUSZA Observatory (KO), Langkawi National Observatory (LNO) and East Coast Environmental Research Institute (ESERI). In this paper, the statistical kurtosis and waterfall method are applied on the radio environment data. The highest average of kurtosis values indicates the lowest of radio environment level at these sites. From obtained results, the highest average of kurtosis value in wide band obtained at 'LNO' which 20.33 and in the specific band was found at 'KO' with a value of 6.06. This preliminary study is important to identify the radio environment level in radio astronomical specific band such as HI band.

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Section: Methodsmentioning

confidence: 76%

Section: Methodsmentioning

confidence: 99%

Determination of Radio Environmental Level in Hydrogen (HI) Band Spectrum by using Kurtosis Analysis

Zafar¹,

Umar²,

Sabri³

et al. 2017

International Journal on Advanced Science, Engineering and Information Technology

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“…The goals of this study are to look into the levels of Radio Frequency Interference using e-CALLISTO stations, analyse it using the kurtosis process, and see if there is a relationship between population density and RFI level. As stated in [18], this kurtosis value was used as an "indicator" of radio environment level in this study. The highest average of kurtosis values indicates the lowest of radio frequency interference at these sites [7].…”

Section: Introductionmentioning

confidence: 99%

The study on the effect of population density on radio frequency interference (RFI) analysis on dynamic spectrum at selected CALLISTO stations

Zainud-din

Sabri

Umar

et al. 2021

phst

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Radio Frequency Interference (RFI) has become a critical issue in radio astronomy observation in recent years. Compact Astronomical Low-Cost Instrument for Spectroscopy in Transportable Observatories (CALLISTO) is a worldwide network of spectrometer system for solar activity monitoring. The detection of solar radio bursts is being interrupted due to RFI as these stations are held on the ground. Since RFI signals are being detected from surrounding, this gives inaccurate data for ground base station observations. RFI sources are mostly from man-made devices. This paper study analysis of RFI level at selected CALLISTO stations by using Kurtosis Analysis. Data from Banting, Malaysia, Sumedang, Indonesia, Ooty, India and Daejeon, South Korea stations for two months (45-870 MHz) that contain solar burst and no solar burst had been selected. The kurtosis value is then compared with the population density to get the relationship between the population density and the RFI level. The highest average of kurtosis value indicates the lowest of radio frequency interference at these sites. MATLAB software was used for the data analysis and Microsoft Excel for the RFI profiling graphing. The results show that the high population density is not a main factor that contributes the interference towards the surrounding.

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Testbed for Radio Astronomy Interference Characterization and Spectrum Sharing Research

Tschimben,

Aradhya,

Weihe

et al. 2023

2023 IEEE Aerospace Conference

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Methods and applications of Radio Frequency Interference surveys for radio astronomy in Malaysia

Cited by 4 publications

References 3 publications

Determination of Radio Environmental Level in Hydrogen (HI) Band Spectrum by using Kurtosis Analysis

Determination of Radio Environmental Level in Hydrogen (HI) Band Spectrum by using Kurtosis Analysis

The study on the effect of population density on radio frequency interference (RFI) analysis on dynamic spectrum at selected CALLISTO stations

Testbed for Radio Astronomy Interference Characterization and Spectrum Sharing Research

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