PRELIMINARY STUDY OF VEHICULAR TRAFﬁC EFFECT ON RADIO SIGNAL FOR RADIO

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

doi:10.11113/jt.v75.4076

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…This study is made possible by the usage of the grant RACE/F1/ST1/UNISZA/ 15 We also gratefully acknowledge Electromagnetic Research Group (EMRG) team members for their assistance and cooperation in this work.…”

Section: Acknowledgementsmentioning

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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Section: Acknowledgementsmentioning

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 can be inferred from [9][10][11][12][13][14] that the satellite earth stations to be converted have been left unused for a long period of time. During the idle time of unused earth stations, the rollout of terrestrial wireless networks in concerned areas is not unlikely, thereby exposing GTs to terrestrial wireless network interference as inferred from [25][26][27][28]. Therefore, converted earth stations require interference protection mechanisms when they are in the vicinity of terrestrial wireless networks.…”

Section: Optimising Terrestrial Radio Astronomy Observationsmentioning

confidence: 99%

Intelligent Cognitive Radio Models for Enhancing Future Radio Astronomy Observations

Periola

Falowo

2016

Advances in Astronomy

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Radio astronomy organisations desire to optimise the terrestrial radio astronomy observations by mitigating against interference and enhancing angular resolution. Ground telescopes (GTs) experience interference from intersatellite links (ISLs). Astronomy source radio signals received by GTs are analysed at the high performance computing (HPC) infrastructure. Furthermore, observation limitation conditions prevent GTs from conducting radio astronomy observations all the time, thereby causing low HPC utilisation. This paper proposes mechanisms that protect GTs from ISL interference without permanent prevention of ISL data transmission and enhance angular resolution. The ISL transmits data by taking advantage of similarities in the sequence of observed astronomy sources to increase ISL connection duration. In addition, the paper proposes a mechanism that enhances angular resolution by using reconfigurable earth stations. Furthermore, the paper presents the opportunistic computing scheme (OCS) to enhance HPC utilisation. OCS enables the underutilised HPC to be used to train learning algorithms of a cognitive base station. The performances of the three mechanisms are evaluated. Simulations show that the proposed mechanisms protect GTs from ISL interference, enhance angular resolution, and improve HPC utilisation.

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“…GIS is playing a very important role in helping users to collect, analyze and display spatial data in different forms tailored to their individual needs (Kamarudin et al 2015b;Mustafa et al 2015;Yusri et al 2009). Site selection studies are essential for decision makers to propose where to build an astronomical observatory with the highest efficiency (Sabri et al 2015;Umar et al 2015). So, in this study, application of GIS will be used to generate the spatial model of sky brightness in Langkawi Island, Malaysia.…”

Section: Introductionmentioning

confidence: 99%

Spatial Model of Sky Brightness Magnitude in Langkawi Island, Malaysia

Tahar

Kamarudin

Umar

et al. 2017

Res. Astron. Astrophys.

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Sky brightness is an essential topic in the field of astronomy, especially for optical astronomical observations that need very clear and dark sky conditions. This study presents the spatial model of sky brightness magnitude in Langkawi Island, Malaysia. Two types of Sky Quality Meter (SQM) manufactured by Unihedron are used to measure the sky brightness on a moonless night (or when the Moon is below the horizon), when the sky is cloudless and the locations are at least 100 m from the nearest light source. The selected locations are marked by their GPS coordinates. The sky brightness data obtained in this study were interpolated and analyzed using a Geographic Information System (GIS), thus producing a spatial model of sky brightness that clearly shows the dark and bright sky areas in Langkawi Island. Surprisingly, our results show the existence of a few dark sites nearby areas of high human activity. The sky brightness of 21.45 mag arcsec −2 in the Johnson-Cousins V -band, as the average of sky brightness equivalent to 2.8 ×10 −4 cd m −2 over the entire island, is an indication that the island is, overall, still relatively dark. However, the amount of development taking place might reduce the number in the near future as the island is famous as a holiday destination.

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PRELIMINARY STUDY OF VEHICULAR TRAFﬁC EFFECT ON RADIO SIGNAL FOR RADIO

Cited by 5 publications

References 13 publications

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

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

Intelligent Cognitive Radio Models for Enhancing Future Radio Astronomy Observations

Spatial Model of Sky Brightness Magnitude in Langkawi Island, Malaysia

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