Seasonal and Diurnal Variation on Tropospheric Scintillation at Ku-Band in Tropical Climate

Tropospheric scintillation is a rapid fluctuation of the received signal amplitude which can cause propagation impairments that affect satellite communication systems operating above 10 GHz. Scintillation data was collected in Equatorial Johor Bahru, Malaysia, based on a one-year Ku-band propagation measurement campaign, utilizing MEASAT-1 Satellite with an antenna elevation angle of 75.61°. This work concentrates on the probability density function (PDF) of diurnal variations of clear sky scintillation variance analyzed on an hourly basis. Besides, seasonal variation of scintillation amplitude has been presented in this paper. From the results, it is concluded that clear sky scintillation variance is likely to occur during morning and afternoon periods. Moreover, clear sky scintillation amplitude of the South-West monsoon shows a relatively higher comparing with others monsoon seasons. Hence, signal attenuation based on seasonal and diurnal information is of great interest for the system designers to appropriately design fade margin.Tropospheric scintillation is a rapid fluctuation of the received signal amplitude which can cause propagation impairments that affect satellite communication systems operating above 10 GHz. Scintillation data was collected in Equatorial Johor Bahru, Malaysia, based on a one-year Ku-band propagation measurement campaign, utilizing MEASAT-1 Satellite with an antenna elevation angle of 75.61°. This work concentrates on the probability density function (PDF) of diurnal variations of clear sky scintillation variance analyzed on an hourly basis. Besides, seasonal variation of scintillation amplitude has been presented in this paper. From the results, it is concluded that clear sky scintillation variance is likely to occur during morning and afternoon periods. Moreover, clear sky scintillation amplitude of the South-West monsoon shows a relatively higher comparing with others monsoon seasons. Hence, signal attenuation based on seasonal and diurnal information is of great interest for the system designers to appropriately design fade margin.

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CLEAR SKY DIURNAL BEHAVIOR OF TROPOSPHERIC SCINTILLATION AT KU-BAND SATELLITE COMMUNICATION IN EQUATORIAL MALAYSIA

Jurnal Teknologi ◽

10.11113/jt.v77.6279 ◽

2015 ◽

Vol 77 (10) ◽

Cited By ~ 1

Author(s):

Ibtihal F. El-Shami ◽

Hong Yin Lam ◽

Jafri Din ◽

Siat Ling Jong

Keyword(s):

Communication Systems ◽

Satellite Communication ◽

Prediction Models ◽

Elevation Angle ◽

Signal Amplitude ◽

Radio Communication ◽

Significant Discrepancy ◽

Comparison Results ◽

Diurnal Behavior ◽

Tropospheric Scintillation

Tropospheric scintillation is referred to rapid fluctuation of received signal amplitude. It can cause propagation impairments that affect satellite communication systems operating at above 10 GHz of frequency. In this work, we have exploited 1 year of measured broadcasting signal data collected in Johor, Malaysia to investigate the effects of scintillation intensity on a SatCom system operating at 11.075 GHz with its links pointed towards the MEASAT-1 satellite (an elevation angle of 75.61°). We have investigated the behavior of this scintillation amplitude through the classification and analysis of a time-series satellite broadcasting signal and have then compared the statistical results with existing scintillation prediction models. The comparison results indicate that there is a significant discrepancy between measured data and those models and that the performance of these prediction models does not appear to be satisfactory, with the exception of the ITU-R and the Ortgies Refractivity model. In addition, we have investigated the diurnal behavior of the scintillation intensity at four different periods of the day and proposed a modified Marzano model to accommodate local meteorological input parameters. The models performances are assessed against the available measurement dataset. The proposed models provide system operators and radio communication engineers with critical information on the fluctuations of tropospheric scintillation variance on the satellite signal during a typical day taken into the account of local meteorological peculiarities.

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Study of tropospheric scintillation effects in Ku-band frequency for satellite communication system

International Journal of Electrical and Computer Engineering (IJECE) ◽

10.11591/ijece.v10i3.pp3136-3144 ◽

2020 ◽

Vol 10 (3) ◽

pp. 3136

Author(s):

Nadirah Abdul Rahim ◽

Hanis Nabilah A. Mulop ◽

Khairayu Badron

Keyword(s):

Electromagnetic Waves ◽

Satellite Communication ◽

Elevation Angle ◽

Small Scale ◽

Band Frequency ◽

Clear Sky ◽

Tropospheric Scintillation ◽

Sky Conditions ◽

Beacon Signal ◽

Ku Band

Scintillation is a rapid fluctuation of an electromagnetic waves in terms of phase and amplitude due to a small-scale inconsistency in the transmission path (or paths) with time. Scintillation exists continuously throughout a day whether during raining or clear sky conditions. The raw signal data need to exclude other propagations factors that include signal fluctuations to further understand the scintillation studies. This paper presents the analysis of tropospheric scintillation data from January 2016 till December 2016 at Ku-band frequency of 12.202 GHz beacon signal. The experimental data from MEASAT 3B were collected and analyzed to see the effect of tropospheric scintillation. The elevation angle of the dish antenna is 77.45o. The highlighted objectives are to analyze the scintillation data at Ku-band, and to compare and validate the results with other scintillation models. The result shows that the stipulated scintillation analysis has higher amplitude, which is 0.73 dB compared to other scintillation analysis which has lower scintillation amplitude: 0.45 dB (Karasawa), 0.42 dB (ITU-R), 0.4 dB (Nadirah & Rafiqul), 0.42 dB (Van De Kamp) and 0.11 dB (Anthony & Mandeep).

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Characterization of concurrent ku band tropospheric scintillation and rain attenuation in Malaysia

Indonesian Journal of Electrical Engineering and Computer Science ◽

10.11591/ijeecs.v15.i2.pp956-961 ◽

2019 ◽

Vol 15 (2) ◽

pp. 956

Author(s):

Ibtihal Fawzi Elshami ◽

Jafri Din ◽

Lam Hong Yin ◽

Ali I Elgayar

Keyword(s):

Communication Systems ◽

Satellite Communication ◽

Power Spectral Analysis ◽

Rain Attenuation ◽

Significant Information ◽

Tropical Regions ◽

Significant Impairment ◽

One Year ◽

Tropospheric Scintillation ◽

Ku Band

<span>Tropospheric scintillation in satellite communication systems operating at frequencies over 10 GHz is a significant impairment, especially in tropical regions, as attenuation affects scintillation dramatically. This work concentrates on tropospheric scintillation in equatorial Johor Bahru, Malaysia, based on a one-year Ku-band propagation measurement study utilising a direct broadcast receiver and an automatic weather station. This study aimed to investigate the relationship between wet scintillation and rain attenuation using experimental measurements. The power spectral analysis has been carried out to determine required cut-off frequency of filtering to separate out rain attenuation and scintillation effects. The results can provide significant information on the fluctuations of wet scintillation at Ku-band earth space link in tropical regions.</span>

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Analysis of Fade Dynamic at Ku-Band in Malaysia

International Journal of Antennas and Propagation ◽

10.1155/2014/741678 ◽

2014 ◽

Vol 2014 ◽

pp. 1-7 ◽

Cited By ~ 6

Author(s):

Siat Ling Jong ◽

Michele D’Amico ◽

Jafri Din ◽

Hong Yin Lam

Keyword(s):

Communication Systems ◽

Satellite Communication ◽

Heavy Rain ◽

Rain Attenuation ◽

Time Interval ◽

Radio Communication ◽

System Operator ◽

Typical Day ◽

One Year ◽

Ku Band

This work investigates fade dynamics of satellite communication systems in equatorial heavy rain region based on a one year of Ku-band propagation measurement campaign carried out in Universiti Teknologi Malaysia (UTM), Johor, Malaysia. First order statistics of rain attenuation are deduced and the results are found to be in good agreement with those obtained from other beacon measurements gathered within the same area (Kuala Lumpur). Moreover, the fade duration and slope statistics of the satellite signal variations are also carefully derived and subsequently compared with the ITU-R recommendation model. Such information is useful for the system operator and radio communication engineer for the design of appropriate fade mitigation techniques as well as the quality of service that could be offered to the user (according to the time interval for a typical day). Further evaluation on the performances of several ITU-R models in the heavy rain region are needed based on the measurement database available of this climatic region.

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A PRIORI ANALYSIS OF RADIATION RESISTANCE OF MULTICHANNEL LOW-NOISE KU-BAND AMPLIFIER

Труды НИИР ◽

10.34832/niir.2021.5.2.006 ◽

2021 ◽

Author(s):

Д.А. ТИТОВ

Keyword(s):

Radiation Dose ◽

Radiation Resistance ◽

Communication Systems ◽

Satellite Communication ◽

A Priori ◽

Low Noise ◽

A Priori Analysis ◽

Onboard Equipment ◽

Ku Band ◽

Unified Design

Приводится алгоритм расчета накопленной дозы радиационного излучения для унифицированной конструкции бортовой аппаратуры систем спутниковой связи The article presents an algorithm for calculating the accumulated radiation dose for the unified design of onboard equipment of satellite communication systems.

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