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Assessment of Several Interpolation Methods for Precise GPS Orbit

Published online by Cambridge University Press:  09 August 2007

Hamad Yousif  and
Ahmed El-Rabbany
Hamad Yousif
Affiliation:
(Ryerson University, Toronto)
Ahmed El-Rabbany*
Affiliation:
(Ryerson University, Toronto)
*
(Email: rabbany@ryerson.ca)
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Abstract

GPS applications such as Precise Point Positioning (PPP) require the availability of precise ephemeris at high rate. To support these applications, several institutions such as the International GNSS Service (IGS) have developed precise orbital service. Unfortunately, however, the data rate of such precise orbits is usually limited to 15 minutes. To overcome this problem, a number of orbital interpolation methods are proposed. This paper examines the performance of four interpolation methods for IGS precise GPS orbits, namely Lagrange, Newton Divided Difference, Cubic Spline and Trigonometric interpolation. In addition, the paper discusses a new approach, which utilizes the residuals between the broadcast and precise ephemeris to generate a high density precise ephemeris. It is shown that the new approach produces better results than previously reported orbital interpolation accuracy.

Keywords

Precise Point PositioningGPSInterpolation

Information

Type
Research Article
Information
The Journal of Navigation , Volume 60 , Issue 3 , September 2007 , pp. 443 - 455
Copyright
Copyright © The Royal Institute of Navigation 2007

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References

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