Impact of Approximate Implementation manner in Klobuchar Model
This paper focuses on the approximations that John A. Klobuchar made in mid 70s in his famous algorithm of ionospheric correction model for single frequency GPS receiver. At that time Klobuchar used a system of fixed geomagnetic north pole coordinates which are not accurate nowadays according to the...
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Istituto Nazionale di Geofisica e Vulcanologia, INGV
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ftjaog:oai:ojs.annalsofgeophysics.eu:article/8507 2023-05-15T17:39:53+02:00 Impact of Approximate Implementation manner in Klobuchar Model Aljuneidi, Aghyas Hasan, Hala Tawfek 2021-11-16 application/pdf https://www.annalsofgeophysics.eu/index.php/annals/article/view/8507 https://doi.org/10.4401/ag-8507 eng eng Istituto Nazionale di Geofisica e Vulcanologia, INGV https://www.annalsofgeophysics.eu/index.php/annals/article/view/8507/7380 https://www.annalsofgeophysics.eu/index.php/annals/article/view/8507 doi:10.4401/ag-8507 Copyright (c) 2021 Annals of Geophysics https://creativecommons.org/licenses/by-nc-nd/4.0 CC-BY-NC-ND Annals of Geophysics; V. 64 N. 4 (2021); RS440 Annals of Geophysics; Vol. 64 No. 4 (2021); RS440 2037-416X 1593-5213 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftjaog https://doi.org/10.4401/ag-8507 2022-03-27T06:38:53Z This paper focuses on the approximations that John A. Klobuchar made in mid 70s in his famous algorithm of ionospheric correction model for single frequency GPS receiver. At that time Klobuchar used a system of fixed geomagnetic north pole coordinates which are not accurate nowadays according to the International Geomagnetic Reference Field and to the World Magnetic Model because the geomagnetic poles move slowly. In addition, Klobuchar had to do other trigonometry simplifications in his implementation to avoid sophisticated computations. In order to evaluate this approximate implementation in a single frequency GPS receiver, ionospheric time and range delay are estimated on the entire day of January 1st 2010, using a different implementation in MATLAB. The required GPS data is obtained from recorded RINEX files at UDMC near DAMASCUS, SYRIA. In this comparative study, we reformulated the standard equations of Klobuchar model and examined the influence of its approximations on the ionospheric range delay and found a non- negligible bias in order of ten centimeters, whereas the influence of the movement of the geomagnetic poles was in order of few centimeters. Article in Journal/Newspaper North Pole Annals of Geophysics (INGV, Istituto Nazionale di Geofisica e Vulcanologia) North Pole Annals of Geophysics 64 4 RS440 |
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Annals of Geophysics (INGV, Istituto Nazionale di Geofisica e Vulcanologia) |
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ftjaog |
language |
English |
description |
This paper focuses on the approximations that John A. Klobuchar made in mid 70s in his famous algorithm of ionospheric correction model for single frequency GPS receiver. At that time Klobuchar used a system of fixed geomagnetic north pole coordinates which are not accurate nowadays according to the International Geomagnetic Reference Field and to the World Magnetic Model because the geomagnetic poles move slowly. In addition, Klobuchar had to do other trigonometry simplifications in his implementation to avoid sophisticated computations. In order to evaluate this approximate implementation in a single frequency GPS receiver, ionospheric time and range delay are estimated on the entire day of January 1st 2010, using a different implementation in MATLAB. The required GPS data is obtained from recorded RINEX files at UDMC near DAMASCUS, SYRIA. In this comparative study, we reformulated the standard equations of Klobuchar model and examined the influence of its approximations on the ionospheric range delay and found a non- negligible bias in order of ten centimeters, whereas the influence of the movement of the geomagnetic poles was in order of few centimeters. |
format |
Article in Journal/Newspaper |
author |
Aljuneidi, Aghyas Hasan, Hala Tawfek |
spellingShingle |
Aljuneidi, Aghyas Hasan, Hala Tawfek Impact of Approximate Implementation manner in Klobuchar Model |
author_facet |
Aljuneidi, Aghyas Hasan, Hala Tawfek |
author_sort |
Aljuneidi, Aghyas |
title |
Impact of Approximate Implementation manner in Klobuchar Model |
title_short |
Impact of Approximate Implementation manner in Klobuchar Model |
title_full |
Impact of Approximate Implementation manner in Klobuchar Model |
title_fullStr |
Impact of Approximate Implementation manner in Klobuchar Model |
title_full_unstemmed |
Impact of Approximate Implementation manner in Klobuchar Model |
title_sort |
impact of approximate implementation manner in klobuchar model |
publisher |
Istituto Nazionale di Geofisica e Vulcanologia, INGV |
publishDate |
2021 |
url |
https://www.annalsofgeophysics.eu/index.php/annals/article/view/8507 https://doi.org/10.4401/ag-8507 |
geographic |
North Pole |
geographic_facet |
North Pole |
genre |
North Pole |
genre_facet |
North Pole |
op_source |
Annals of Geophysics; V. 64 N. 4 (2021); RS440 Annals of Geophysics; Vol. 64 No. 4 (2021); RS440 2037-416X 1593-5213 |
op_relation |
https://www.annalsofgeophysics.eu/index.php/annals/article/view/8507/7380 https://www.annalsofgeophysics.eu/index.php/annals/article/view/8507 doi:10.4401/ag-8507 |
op_rights |
Copyright (c) 2021 Annals of Geophysics https://creativecommons.org/licenses/by-nc-nd/4.0 |
op_rightsnorm |
CC-BY-NC-ND |
op_doi |
https://doi.org/10.4401/ag-8507 |
container_title |
Annals of Geophysics |
container_volume |
64 |
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4 |
container_start_page |
RS440 |
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1766140647211794432 |