Estimation of Total Electron Content Using Single Frequency Weighted Observations for Esfahan Province
Publication: Journal of Surveying Engineering
Volume 131, Issue 2
Abstract
One of the major error sources in the global positioning system (GPS) is ionospheric delay (refraction). This delay is frequency dependent and therefore can be removed by dual frequency receivers. Using eight coefficients transmitted as part of the navigation message a correction can be provided for single frequency users called the Klobuchar model. This model is expected to remove up to 50% of ionospheric delay. On the other hand all receivers cannot recover coefficients. This paper is a report on our attempt at the GPS site of Esfahan University to model the zenith ionospheric delay from weighted observation of the L1 code and carrier phase, made with a 12-channel Leica System 500 receiver. The results will be compared with IGS and Klobuchar model estimates.
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Acknowledgments
The writers acknowledge UNAVCO for the availability of teqc software, especially Dr. Louis H. Estey for useful information. This work is part of Esfahan University Project registered under No. 791126.
References
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Published In
Journal of Surveying Engineering
Volume 131 • Issue 2 • May 2005
Pages: 60 - 66
Copyright
© 2005 ASCE.
History
Received: Jan 30, 2002
Accepted: Jun 22, 2004
Published online: May 1, 2005
Published in print: May 2005
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