Significant of earth's magnetic field and ionospheric horizontal gradient to GPS signals
Ray tracing technique can be used to determine the effect of Earth's magnetic field to (Global Positioning Systems (GPS) signals with and without the presence of ionospheric horizontal gradient. In this project, Jones 3D Ray Tracing program was employed to study the effect of the ionosphere on...
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| Main Authors: | , |
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| Format: | Conference or Workshop Item |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/4079/ http://eprints.uthm.edu.my/4079/1/Significant_of_Earth's_Magnetic_Field.pdf |
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| Summary: | Ray tracing technique can be used to
determine the effect of Earth's magnetic field to (Global
Positioning Systems (GPS) signals with and without the
presence of ionospheric horizontal gradient. In this
project, Jones 3D Ray Tracing program was employed
to study the effect of the ionosphere on GPS rays (L,
and L,). The group path or delay is obtained from the
difference between the distances of the ray path to the
Earth station from the GPS satellite determined from
the ray-tracing and the distance for propagation over
the line of sight (LOS). Then, the residual range error (RRE), which is the difference between the standard dual frequencies models corrected range and LOS, will
be calculated. The gradient ionospheric profile was then
used to compare the effect of the ionosphere with and
without gradient on GPS ray tracing. Results show that
there is difference in between the RRE calculation with
and without the presence of the ionospheric gradient.
The Earth's magnetic field effect to GPS signal is
normally neglected since it has very minimal effect.
However, in this research, results obtained show that
the Earth's magnetic field has to be taken into account
in order to determine more accurate GPS ray tracing. |
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