| dc.description.abstract |
Satellite communication, certainly is one of the most reliable means of communication
nowadays because of its larger coverage, broader bandwidth and ability to provide an
incessant communication. In order to enhance the navigation accuracy, augmentation
systems for Global Navigation Satellite System (GNSS) have been developed in many
countries. These augmentation systems work locally to minimize the computational error
so that extreme accuracy can be achieved. To establish an augmentation system is a
complex task as many factors need to be considered. Bangladesh being a satellite owning
country can aim for developing its own augmentation system provided the major
requirements are studied as well as analyzed satisfactorily which will leverage the
economic growth and can be a defense asset. Several navigation systems use different
satellite constellations for navigation purpose but for an augmentation system the best one
or combination should be selected by investigating some of the important relevant
parameters. So, a comparison is required among the navigation systems over a particular
period of time, surveying at different locations in Bangladesh to detect the best possible
system as well as differentiate among the locations based on the parameters. As array
antenna has been proven to be more beneficial than a single element antenna as it not only
augments the directivity but also enables beam steering capability which is accomplished
by establishing a phase difference relation among the antenna elements. Furthermore,
selecting location for ground station is significant in augmentation system. The behavior of
satellite signal differs in different locations as the environmental condition is not the same.
Bangladesh is a subtropical monsoon country having variations in temperature, rainfall and
humidity, so these factors along with the parameters will play a vital role in the selection
of ground station. In a nut shell, this thesis work aims to perform some of the major criteria
to setup an augmentation system for Bangladesh, from analyzing various satellite
constellation and comparing among them in order to find out the performance parameters
to developing some reference station antennas. Additionally, the atmospheric effects have
also been evaluated to find out the signal propagation delay for different cities in order to
compare among the cities to find out the location for reference station. Also, uplink and
downlink loss analysis has been done by estimating the crucial factors. |
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