Development of Satellite Propagation Effects Tool For Ku-Band, Ka-Band And Q/V-Band Links
The thesis presents Graphical User Interfaces (GUIs) to analyse satellite propagation effects for Ku-band, Ka-band and QN-band links by using Matlab programming languages. The Matlab-based tool allows simulation to be carried out in the step and run modes. The Graphical User Interface (GUI) is a...
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| Format: | Thesis |
| Language: | English English |
| Published: |
2005
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/6055/1/FK_2005_46.pdf |
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| Summary: | The thesis presents Graphical User Interfaces (GUIs) to analyse satellite propagation
effects for Ku-band, Ka-band and QN-band links by using Matlab programming
languages. The Matlab-based tool allows simulation to be carried out in the step and
run modes. The Graphical User Interface (GUI) is a powerful, unique utility and
programming interface, usable for research and simulation in the optimisation of
microwave signal propagation. The GUIs gives easy access to analyse rain
attenuation, cloud attenuation and fog attenuation. These software development tools
are a set of Matlab solvers, graphical, computational utilities for quadratic,
polynomial and regression programming. The GUIs may also be used as a preprocessor
to generate Matlab code for stand-alone execution. Once the software tools
for satellite propagation effects on Ku-band, Ka-band and QN-bands links GUIs is
launched, user can enter input parameter values (frequency, elevation angle,
temperature, visibility, cloud cover, rainfall, e.t.c) in text control to analyse the
propagation impairments.
In this thesis, the characteristics of the reliable design of satellite communication
systems operating at frequency above 10 GHz, Ku (12.5 - 18 GHz), Ka (26.5 - 40GHz) and QN (40 - 50 GHz) band were examined. Rain attenuation, cloud
attenuation and fog attenuation are the sources for fading propagation effects in these
bands frequency. Analytical and ITU recommendations models were used to predict
output attenuation for this analysis. However, the effects on satellite systems
operating in the Ku, Ka and QN band essentially depends on the propagation
characteristics of the transmission medium.
The NOAA ((National Oceanic and Atmospheric Administration) satellite data 2003,
which were obtained from the Malaysian Meteorological service, were used in this
analysis for area of interest Subang (elevation angle 36.54'), Alor Setar (elevation
angle 34.97'), and Batu Embun (elevation angle 37.25'). The rain attenuation due to
rainfall depends on the rain rate (mrnlhr) distribution at the 0.01% probability as
main the input. At the Ku, Ka and QN-bands frequencies, rain is a dominant source
of attenuation. Thunderstorm activities were found to give large effect on the rain
rate values during raining condition. Cloud attenuation is a function of cloud
temperature integrated cloud liquid water content (g/m3) along propagation path. For
fog attenuation, visibility and temperature become main meteorological input
function along propagation path analysis at the earth station site. Cloud and fog
attenuation, which have been neglected at the lower frequencies band, can
significantly limit the performance of high frequencies band satellite systems.
However, in recent years, higher frequencies are gradually being used for satellite
communications in order to avoid congestion in the traditional low bands (S, L, C
and X) frequencies and can be used for high quality satellite service. Unfortunately increasing operating frequency from Ku-band to Ka-band and QN-band will
increase the attenuation level and hence, reducing performance of the satellite. |
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