Effect of ionospheric horizontal gradient to GPS signals at IPP
GPS ray propagates at two carrier frequencies; Ll at 1575.42 MHz and L2 at 1227.6 MHz In this project, Jones 3D Ray Tracing program being used to determine the characteristics of the GPS ray as it propagates through the ionosphere. A numerical mathematical model which is continuous and contains no s...
Saved in:
| Main Author: | |
|---|---|
| Format: | Article |
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/2462/ http://eprints.uthm.edu.my/2462/1/Effect_of_Ionospheric_Horizontal_Gradient.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | GPS ray propagates at two carrier frequencies; Ll at 1575.42 MHz and L2
at 1227.6 MHz In this project, Jones 3D Ray Tracing program being used to
determine the characteristics of the GPS ray as it propagates through the
ionosphere. A numerical mathematical model which is continuous and contains no
singularities has been used to represent the actual formation of the ionosphere in 3
dimensional (latitude, longitude and altitude). By using GPS ray tracing, it has been
proved that the path of propagation for both Ll and Lz in the ionosphere is different.
The point (latitude and longitude) where Ll intersects at IPP is different than the
point (latitude and longitude) of intersection of L2. IPP or Ionospheric Pierce Point is
the altitude in the ionosphere where the composition of electron density is greatest.
It is also shown that the distance between the Ll and L2 at IPP over the equatorial
region is greater than in the mid-latitude region. This is due to the difference in the
composition of electron density in both these regions and also due to the presence
of ionospheric horizontal gradient. In GPS, the presence of ionospheric horizontal
gradient can effect the final GPS positioning if its' being ignored, especially the GPS
positioning over theequatorial region. |
|---|