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Geodesy and GPS |
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Geodesy is the study of the size, shape, and the effect of the physical
properties of the earth on measurements. A mathematical model of the
earth is the subject of geometric geodesy, the earth’s gravity
field is the subject of physical geodesy, and the use of earth satellites
to measure the earth’s surface the concern of satellite geodesy.
The civilian use of the Global Positioning System (GPS) is a major
component of the study of geodesy.
GPS plays a valuable role in providing precise measurements between
receivers on the earth’s surface based on one-way signals broadcast
from a network of satellites. Study of the models used by GPS systems
to determine precise coordinate locations and the transformation of
these initial coordinates to facilitate the accomplishment of local
geomatics projects is a major portion of the course work in GEM 3370
Geodesy and Geodetics.
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| GPS is complex system that is easy to use. However, to understand
the system itself, one needs to study the propagation of electromagnetic
waves (microwaves), the properties of the atmosphere, the orbits of
the satellites and the impact of solar radiation, the concept of precise
timing, the ellipsoid model used as a reference system for GPS measurements,
transformations between coordinate systems, and the principles of
least squares adjustment. |
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