DGPS positional improvement by mitigating the ionospheric horizontal gradient and elevation angle effects

Nagarajoo, K and Mohd Zain, Ahmad Faizal (2010) DGPS positional improvement by mitigating the ionospheric horizontal gradient and elevation angle effects. In: Proceedings of 2010 IEEE Asia-Pacific Conference on Applied Electromagnetics (APACE 2010), 9-11 November 2010, Port Dickson.

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Abstract

Over the equatorial region, the inhomogeneous formation of the ionosphere introduces greater ionospheric horizontal gradient which could give greater positioning error for a user station in a DGPS system. Furthermore, the difference in the elevation angle of the user station that ‘views’ the same GPS satellite as the reference station also introduces range measurement errors at mm to cm levels. In order to mitigate those two effects in a DGPS system, the Jones 3D ray tracing program was used to show final positioning improvement at the user station. Group delay and carrier phase advance measurements from 8 GPS satellites were used to determine and mitigate the effects of ionospheric horizontal gradient and the elevation angle. Positioning improvement of about 7 cm has been obtained by using both group delay and carrier phase advance measurements. This shows a good positioning improvement for the user station in a DGPS system that is located over the equatorial region.

Item Type:Conference or Workshop Item (Paper)
Uncontrolled Keywords:DGPS; ionospheric horizontal gradient; elevation angle; user 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:3004
Deposited By:Normajihan Abd. Rahman
Deposited On:08 Feb 2013 11:00
Last Modified:21 Jan 2015 15:26

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