Satellite Beacon Experiment for Studying Atmospheric Dynamics

Mandeep, J. S.; Ng, Yun Yann

doi:10.1007/s10762-010-9658-4

Cited by 13 publications

(8 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Various studies had been carried out to predict the clear sky tropospheric scintillation, using, in particular, diurnal behaviour related to the hour of the day [6]- [12]. Similar studies that focus on this aspect in heavy rain regions are still very rare, with the [13], [14]. Hence, it is worthwhile to further investigate the seasonal and diurnal variations of scintillation in this heavy rain region.…”

Section: Introductionmentioning

confidence: 99%

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

Elshami

Din

2016

IJECE

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

confidence: 99%

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

Elshami

Din

2016

IJECE

View full text Add to dashboard Cite

show abstract

“…The LMS channel condition at Ku-band depends on mobility impairments and tropospheric scintillation. The latter, which causes rapid fluctuations in satellite signal level, occurs due to the irregularities in radio refractivity as the wave travels along different medium densities in the troposphere [3,4]. Several researchers [1,2,[5][6][7][8][9][10] have created well-designed LMS channel models.…”

Section: Introductionmentioning

confidence: 99%

Tracking- and Scintillation-Aware Channel Model for GEO Satellite to Land Mobile Terminals at Ku-Band

Al-Saegh

Sali

Singh³

2015

International Journal of Antennas and Propagation

Self Cite

View full text Add to dashboard Cite

Recent advances in satellite to land mobile terminal services and technologies, which utilize high frequencies with directional antennas, have made the design of an appropriate model for land mobile satellite (LMS) channels a necessity. This paper presents LMS channel model at Ku-band with features that enhance accuracy, comprehensiveness, and reliability. The effect of satellite tracking loss at different mobile terminal speeds is considered for directional mobile antenna systems, a reliable tropospheric scintillation model for an LMS scenario at tropical and temperate regions is presented, and finally a new quality indicator module for different modulation and coding schemes is included. The proposedextended LMS channel (ELMSC)model is designed based on actual experimental measurements and can be applied to narrow- and wide-band signals at different regions and at different speeds and multichannel states. The proposed model exhibits lower root mean square error (RMSE) and significant performance observation compared with the conventional model in terms of the signal fluctuations, fade depth, signal-to-noise ratio (SNR), and quality indicators accompanied for several transmission schemes.

show abstract

“…As the radio frequency signal radiates through an Earth-sky communication link, its quality degrades as it propagates through the link because of the absorption and scattering by the particles in space [1]. This degradation significantly affects the received information, particularly with the recent advances in satellite technologies and services, which require a high information rate.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric Propagation Model for Satellite Communications

Al-Saegh¹,

Sali²,

Mandeep³

et al. 2014

MATLAB Applications for the Practical Engineer

View full text Add to dashboard Cite

Additional information is available at the end of the chapter http://dx.doi.org/10.5772/58238 . IntroductionAs the radio frequency signal radiates through an Earth-sky communication link, its quality degrades as it propagates through the link because of the absorption and scattering by the particles in space [ ]. This degradation significantly affects the received information, particularly with the recent advances in satellite technologies and services, which require a high information rate. Furthermore, the extent of degradation depends on the link, atmospheric, transmitted signal, and receiver antenna parameters.Two types of signal fluctuations caused by atmospheric phenomena, fast and slow fluctuations [ ], as shown in Figure . The former is called scintillation, which is typically caused by rapid variations of signal performance attributed to the turbulent refractive index inhomogeneity in the medium. Meanwhile, slow fluctuations are usually caused by the absorption and scattering of the signal energy by the particles, particularly water droplets, in the link between the satellite and the earth station.With respect to the atmospheric layers, the satellite signal may be subjected to different types of scintillations. Ionospheric scintillation occurs because of the irregularities in electron density in the ionosphere [ ] approximately from km to km above sea level and, thus, irregularities in the refractive index. Whereas, tropospheric scintillation is caused by irregularities in radio refractivity as the wave travels along different medium densities in the troposphere approximately km to km above sea level [ ].The variation of the transmitted signal parameters frequency f and elevation angle θ, in particular has the major impact on the amount of the atmospheric impairments. For the transmitted signal frequencies below GHz, the ionospheric scintillation has a significant Transmission at a low-elevation angle during the rain, condensed clouds, water vapor and Oxygen will increase the effective rain, clouds, water vapor, and Oxygen path of the signal on the medium, respectively, which in turn causes degradation in the received signal level. Therefore, the engineers in earth stations try to access the nearest possible satellite in order to increase the elevation angle, and hence, decrease the effect of atmospheric parameters.The atmospheric impairments effects on the earth sky communication quality increase the need for developing prediction models in order to index the atmospheric fade level as well as select the proper fade mitigation technique FMT .This chapter proposes a complete model of atmospheric propagation to improve the estimation and the analysis of atmospheric effects on the signal quality in satellite communications using actual measured parameters. The model is composed of correlated modules that include channel modules and quality assessment extended modules. . Channel modelThe general satellite system model contains three main components Earth station s , satellite s , and the link s between them...

show abstract

Satellite Beacon Experiment for Studying Atmospheric Dynamics

Cited by 13 publications

References 14 publications

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

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

Tracking- and Scintillation-Aware Channel Model for GEO Satellite to Land Mobile Terminals at Ku-Band

Atmospheric Propagation Model for Satellite Communications

Contact Info

Product

Resources

About