الفهرس 
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Abstract
Over the past years and so far, there is a global interest on how to
improve positioning accuracy. The most popular method to fix
positions is by using Global Navigation Satellite Systems (GNSSs)
such as Global Positioning System (GPS), GLONASS and Galileo.
These systems differ in their constellation specification; number of
satellites, number of orbits, distribution of satellites in the orbits,
etc. An essential reason for developing many satellite systems is to
ensure maximum coverage to users on earth as to determine position
the user needs using at least 4 visible satellites. A suitable solution
to improve the accuracy is developing integrated satellite navigation
system from various systems as it will provide more satellites than
individual systems so that the user will have the ability to choose
from many visible satellites and select the ones that provide better
accuracy. The measured position will not be precise due to several
factors. The most important of them is Geometric Dilution of
Precision (GDOP). In this thesis, the effect of satellite navigation
systems combinations on positioning accuracy is investigated by
considering GDOP. The goal is to acquire the best combination of
satellites which give minimum GDOP values in order to improve
accuracy. A block scheme of integrated receiver is proposed.