AN ASSESSMENT OF THE IMPACT OF HARMATTAN PARTICLES ON MICROWAVE PROPAGATION IN THE SAVANNAH REGION (A CASE STUDY OF N’DJAMENA, CHAD)
AN ASSESSMENT OF THE IMPACT OF HARMATTAN PARTICLES ON MICROWAVE PROPAGATION IN THE SAVANNAH REGION (A CASE STUDY OF N’DJAMENA, CHAD)
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Date
2007-09
Authors
PARFAIT, NALDONGAR
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Abstract
This thesis reports the result of an assessment of the impact of harmattan particles on
microwave signals in the savannah region. Emphasis was placed on the spatial harmattan
particle density, the specific particle attenuation variation, the atmospheric attenuation
and the dominant propagation mechanism during the harmattan period which is peculiar
to the savannah region. The report studied scattering mechanism, absorption mechanism
and specifically described how to determine the specific particle attenuation, atmospheric
losses and spatial harmattan particles density. The attenuation of wavelengths in the
900MHz and 1800MHz band during harmattan period in the savannah region was studied
and path loss curves are presented. The significant results obtained are also discussed and
interpreted. Finally the comparative statistical analysis of the results has been done. It is
established that the particle density is responsible for the scattering of electromagnetic
energy which leads to attenuation in its signal strength. For the year 2004, the
atmospheric losses range between 3.7dB and 12.55dB, for 2005, the atmospheric losses
range between 3.3dB and 18.94dB for 2006, the atmospheric losses range between
1.71dB and 13.03dB. From the statistical analysis, the highest path loss occurs on Farcha
road while the lowest occurs on Moursal road.
Description
A THESIS PRESENTED TO THE DEPARTMENT OF ELECTRICAL ENGINEERING AHMADU
BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR
THE AWARD OF THE DEGREE OF MASTER OF SCIENCE (MSc) IN ELECTRICAL
ENGINEERING
SEPTEMBER, 2007
Keywords
ASSESSMENT,, IMPACT,, HARMATTAN,, PARTICLES,, MICROWAVE,, PROPAGATION,, SAVANNAH,, REGION,, CASE STUDY,, N’DJAMENA, CHAD