Investigation on the Frequency Allocation for Radio Astronomy at the <i>L</i> Band

Abidin, Zamri Zainal; Umar, Roslan; Ibrahim, Zainol Abidin; Rosli, Zulfazli; Asanok, K.; Gasiprong, N.

doi:10.1017/pasa.2013.25

Cited by 14 publications

(12 citation statements)

References 18 publications

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“…The study was done in Malaysia and Thailand, and it was found that the interferences come from electronic equipment especially radio navigation (731 MHz until 752 MHz), radio broadcasting (151 MHz, 151.8 MHz and 152 MHz), aeronautical navigation (245.5 MHz, 248.7 MHz and 249 MHz) and fixed mobile (605 MHz, 608.3 MHz, 612.2 MHz and 613.3 MHz). At the same time, it was observed that the frequency band of 320 MHz until 330 MHz were free from interferences and best band to conduct the solar burst observation [7], [8], [20]. Several radio astronomical lines with their own rest frequency in the radio band as listed by MCMC and ITU were shown in this paper.…”

Section: Introductionmentioning

confidence: 90%

“…According to [7], [8], they found that the major effect of RFI on astronomical lines is below 1 GHz. The study was done in Malaysia and Thailand, and it was found that the interferences come from electronic equipment especially radio navigation (731 MHz until 752 MHz), radio broadcasting (151 MHz, 151.8 MHz and 152 MHz), aeronautical navigation (245.5 MHz, 248.7 MHz and 249 MHz) and fixed mobile (605 MHz, 608.3 MHz, 612.2 MHz and 613.3 MHz).…”

Section: Introductionmentioning

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: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

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 rest of the spectrum has been allocated for other purposes, such as telecommunication, radio and TV transmission, and many more, which sometimes interfere with radio astronomical observations. However, we are appreciative to the international union for sparing the hydrogen lines (HI) frequency for radio astronomy study and that this remains protected for astronomers to further study this spectrum and the Universe (Abidin et al, 2009(Abidin et al, , 2010(Abidin et al, , 2013. http://pkas.kas.org…”

Section: Spectrum Managementmentioning

confidence: 99%

How to Deal With Radio Astronomy Interference

Umar

Hazmin²,

Abidin³

et al. 2015

Publications of The Korean Astronomical Society

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Radio sources are very weak, as they can travel through large distances. Radio sources also have photons with low energies compared to others electromagnetic waves (EM). Microwave photons have a little more energy than radio waves, infrared photons have still more, then visible, ultraviolet, X-rays, and the most energetic electromagnetic wave is gamma-rays. Radio astronomy studies are restricted due to radio frequency interference (RFI) produced by people. If this disturbance is not minimized, it poses critical problems for astrophysical studies. The purpose of this paper is to profile RFI maps in Peninsular Malaysia with a minimum mapping technique for RFI interference. Decision-making processes using GIS (Geographical Information System) for the selection requires gathering information for a variety of parameters. These factors affecting the selection process are also taken into account. In this study, various factors or parameters are involved, such as the availability of telecommunications transmission (including radio and television), rainfall, water lines and human activity. This mapping step must be followed by RFI site testing in order to identify areas of low RFI. This study will benefit radio astronomy research, especially regarding the RFI profile.

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“…At the same time, in [9] have done a survey of Hydrogen lines around 1300MHz-1500MHz and investigate the RFI in this band. They found frequency between 1380MHz-1400MHz is very important window for radio astronomy.…”

Section: Introductionmentioning

confidence: 99%

Spectrum monitoring: Radio Frequency Interferences (RFI) profile for hydroxyl (OH) lines window

Zafar¹,

Zafar²,

Ibrahim³

et al. 2018

J. Fundam and Appl Sci.

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It was crucial to monitor the Radio Frequency Interference (RFI) in order to conduct the radio astronomical research with very minimum RFI. The data. In this work, we have investigated the RFI strength (dBm) and presenting on how the nearby RFI affect to the OH lines window (1600 MHz spectrum was done in one minute interval in 24 hours observation at Kusza Observatory using spectrum analyzer. RFI analysis was done by identifying the RFI strength (dBm) in 3 separated OH lines window which found as the higher RFI strength compared other two window. (1575MHz) has found affected the OH lines window by spilling out until 90MHz to the left and 180MHz to the right.

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Investigation on the Frequency Allocation for Radio Astronomy at the L Band

Abstract: In this paper, the frequency allocation reserved for radio astronomy in the L band set by the International Telecommuni-

Cited by 14 publications

References 18 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

How to Deal With Radio Astronomy Interference

Spectrum monitoring: Radio Frequency Interferences (RFI) profile for hydroxyl (OH) lines window

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