DGPS positioning improvement by utilizing the ionospheric horizontal gradient factor

Nagarajoo, K (2010) DGPS positioning improvement by utilizing the ionospheric horizontal gradient factor. In: Malaysia Annual Physics Conference 2010 (PERFIK-2010), 27-30 October 2010, Damai Laut, Malaysia.

Full text not available from this repository.

Abstract

The ionospheric horizontal gradient is the variation of electron density with latitude and longitude which can cause the azimuthal deviation of the Global Positioning System (GPS) ray path. The effect of an ionospheric horizontal gradient is more pronounced in the low-latitude region (equatorial) and mid-auroral (trough) or polar regions than at mid-latitudes. In this paper, the positioning improvement in differential GPS (DGPS) by mitigating the ionospheric horizontal gradient has been shown. This ionospheric horizontal gradient factor was obtained from ionospheric tomographic images or contour of Total Electron Content (TEC) from Rutherford Appleton Laboratory (RAL) in the United Kingdom (UK). Since the factor of ionospheric horizontal gradient from RAL UK’s TEC contour correlates very well with the factor of ionospheric horizontal gradient from the International Reference Ionosphere (IRI), so the factor of ionospheric horizontal gradient for the ionosphere over the equatorial region was determined from IRI. Then, this factor will be used to show DGPS positioning improvement over the equatorial region. By using the same linear gradient method approach, a significant amount of positioning improvement (15cm) has been shown over the equatorial region for the DGPS by mitigating the ionospheric horizontal gradient.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:DGPS; ionospheric horizontal gradient; positioning improvement
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA501-625 Surveying
Divisions:Faculty of Electrical and Electronic Engineering > Department of Communication Engineering
ID Code:3005
Deposited By:Normajihan Abd. Rahman
Deposited On:08 Feb 2013 11:01
Last Modified:21 Jan 2015 15:26

Repository Staff Only: item control page