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The satellite geometry constitutes a major factor in determining the precision of satellite based
positioning system. In precise point positioning as well as differential positioning, the number
of visible satellites affect the satellite geometry which in turn affects Position Dilution of
Precision (PDOP) and subsequently precision in positioning. In the use of GPS only
observations in areas such as urban canyons, mountains and open-pit mines, satellite visibility
by the GPS receiver is greatly reduced as multipath effect is very high. This underscores the
need to integrate GPS and GLONASS observations to improve the satellite visibility and
Geometry. The research focuses on differential observations carried out on 23 secondary
control points within University of Lagos, Nigeria, using a GNSS receiver in static mode with
a Primary control XST347 as base reference. The results were post processed using only the
GPS observations and then integrated with the GLONASS observations.
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