Some ionospheric factors affecting the coverage of an HF/VHF direct broadcasting satellite service

Rush, C. M.; Stewart, F. G.; PoKempner, M.; Reasoner, R. K.

doi:10.1109/tap.1986.1143837

Cited by 2 publications

(1 citation statement)

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“…As well as the ionosphere has a significant effect on the signal characteristics, which include scintillation, absorption, group delay.etc. Earlier studies such in [5] discuss the issues of parameters that have effects on satellite signals, particularly through the ionosphere. The section has attempted to yield brief concepts of the parameters that are necessary to design a model for this paper.…”

Section: Propagation Effect On Satellite Signalmentioning

confidence: 99%

Signal Propagation for Satellite Communications on Iraqi Territory: Measurements and Simulation

Al-Behadili¹,

Al-Maliki²

2019

IJITEE

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In the last sixteen years, there has been an increment in the use of Satellite communications in Iraq. It is generally used in every home in this country. However, the quality of the signal coming from different Satellite providers is still not optimised. There are several reasons which affected this service such as engineering issues and physical impact. Therefore, there is a necessity for studying this topic and focus the light on the main problems that could hinder the improvement of Satellite communications. This paper attempt to present a model that can be employed for prediction of a communication signal from the satellite and the several issues related to that model. The model is constructed from gathering various models and concepts that are necessary to consider such as the effect of non-ionised atmosphere and the ionosphere. In addition to reviewing the effect of gains from the antenna which contained in the specific equation of defining the signal power. Finally, the simulation results were compared with the outcome from measurements to examine the system reliability.

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Section: Propagation Effect On Satellite Signalmentioning

confidence: 99%

Signal Propagation for Satellite Communications on Iraqi Territory: Measurements and Simulation

Al-Behadili¹,

Al-Maliki²

2019

IJITEE

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A Cause of Momentary Level Shifts Appearing in Broadcast Satellite Signals

NISHIMURA

Jeong

SUSUKITA

et al. 2023

IEICE Trans. Commun.

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The degree of reception of BS signals is affected by various factors. After routinely recording it at two observation points at two locations, we found that momentary upward and downward level shifts occurred multiple times, mainly during daytime. These level shifts were observed at one location. No such signal was sensed at the other location. After producing an algorithm to extract such momemtary level shifts, their statistical properties were investigated.Careful analyses, including assessment of the signal polarity, amplitude, duration, hours, and comparison with actual flight schedules and route information implied that these level shifts are attributable to the interference of direct and reflected waves from aircraft flying at approximately tropopause altitude. This assumption is further validated through computer simulations of BS signal interference.

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Some ionospheric factors affecting the coverage of an HF/VHF direct broadcasting satellite service

Cited by 2 publications

References 0 publications

Signal Propagation for Satellite Communications on Iraqi Territory: Measurements and Simulation

Signal Propagation for Satellite Communications on Iraqi Territory: Measurements and Simulation

A Cause of Momentary Level Shifts Appearing in Broadcast Satellite Signals

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