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Effect of ionospheric horizontal gradient to GPS signals at IPP

Nagarajoo, K Effect of ionospheric horizontal gradient to GPS signals at IPP. Compilation of Papers - VOLUME 1.


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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.

Item Type: Article
Uncontrolled Keywords: GPS; ionospheric horizontal gradient; IPP; Jones 30 Roy Rracing
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
Divisions: Faculty of Electrical and Electronic Engineering > Department of Electrical Technology
Depositing User: Normajihan Abd. Rahman
Date Deposited: 15 May 2012 00:44
Last Modified: 15 May 2012 00:44
URI: http://eprints.uthm.edu.my/id/eprint/2462
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