Preliminary Study of Radio Astronomical Lines Effect of Rain Below 2.9 GHZ

Umar, Roslan; Sabri, Nor Hazmin; Abidin, Zainal; Ibrahim, Zainol Abidin; Azid, Azman; Juahir, Hafizan; Toriman, Mohd Ekhwan; Kamarudin, Mohd Khairul Amri

doi:10.11113/jt.v75.3984

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…Radio astronomy is a young and vibrant science that is being studied in many different areas of the universe and makes many new discoveries. Quasars, pulsars, the Big Bang, and many other phenomena were first discovered by radio astronomers, to name a few examples of celestial objects captured [2,3]. The celestial object is studied in radio astronomy observation by capturing radio waves [4] at all frequencies emitted from the celestial inside electromagnetic radiation.…”

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

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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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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

View full text Add to dashboard Cite

show abstract

“…Radio Astronomy is a growing, young and vigorous science in which it is being explored in many parts of the universe and has been making a lot of new discoveries. To name some examples of a celestial object captured; quasars, pulsars, the Big Bang and many phenomena were first revealed by radio astronomer [1], [2]. In radio astronomy observation, the celestial object is studied by capturing the radio waves [19] at all frequency emitted from the celestial within electromagnetic radiation.…”

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 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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“…Its Rician K factor gradually decreases as the strength of either wind or rain increases due to the movement of the forest components. However, in the preliminary study of radio astronomical lines effect of rain below 2.9 GHz stated that the raindrop size does not give significant effect on the signal attenuation for frequency below 2.9 GHz [6]. An experimental study has investigated the performance of a passive UHF Radio Frequency Identification (RFID) based system under changing environmental conditions to facilitate increased technology exploitation which addressed the impact of temperature and humidity variations on the system response.…”

Section: Introductionmentioning

confidence: 99%

Temperature Effect on the Tropospheric Radio Signal Strength for UHF Band at Terengganu, Malaysia

Mat¹,

Shafie²,

Sabri³

et al. 2016

International Journal on Advanced Science, Engineering and Information Technology

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In tropospheric layer, radio waves can propagate in a number of different physical mechanisms such as free-space propagation or line-of-sight propagation, reflection, transmission, diffraction, scattering and wave guiding. The constituents in weather such as the wind, air temperature and atmospheric water content may combine in many ways. Certain combinations can cause radio signals to be heard hundreds of miles beyond the ordinary range of radio communications. This study investigates the effect of weather (temperature) on radio wave propagation up to 9GHz. Continuous-wave (CW) envelope fading waveforms were recorded over a period of the one-hour using patch antenna. The observations were conducted at KUSZA Observatory, East Coast Environmental Research Institute (ESERI), UniSZA which is situated in Merang, Terengganu. Spectrum Analyser was used for RFI measurement and weather station for weather effect. The graphs of radio signal attenuation for weather parameter (temperature) against time were plotted. The findings indicate that there is a relationship between radio signals with the change of temperature. The correlation between RFI frequencies and temperature give negative effect for frequency 945 MHz, was r = -0.085, while for 383 MHz (r = 0.249), 1800 MHz (r = 0.268) and 2160 MHz (r = 0.134). These findings will benefit radio wave propagation research field which includes radio astronomy observations, space science, wireless communication, satellite, antenna and mobile communication and also electromagnetic radiation (EMR) research for health.Keywords-temperature effect, radio signal propagation, radio astronomy, radio frequency interference.

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Preliminary Study of Radio Astronomical Lines Effect of Rain Below 2.9 GHZ

Cited by 5 publications

References 11 publications

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

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

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

Temperature Effect on the Tropospheric Radio Signal Strength for UHF Band at Terengganu, Malaysia

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