Accuracy assessment of the GPS-TEC calibration constants by means of a simulation technique

During the last 2 decades, Global Positioning System (GPS) measurements have become a very important data-source for ionospheric studies. However, it is not a direct and easy task to obtain accurate ionospheric information from these measurements because it is necessary to perform a careful estimati...

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Detalles Bibliográficos
Autores principales: Conte, Juan Federico, Azpilicueta, Francisco Javier, Brunini, Claudio Antonio
Formato: Articulo
Lenguaje:Inglés
Publicado: 2011
Materias:
Astronomía
GPS
Differential Code Biases (DCB)
sTEC
Ionosphere
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/137501
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-137501
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
GPS
Differential Code Biases (DCB)
sTEC
Ionosphere
spellingShingle Astronomía
GPS
Differential Code Biases (DCB)
sTEC
Ionosphere
Conte, Juan Federico
Azpilicueta, Francisco Javier
Brunini, Claudio Antonio
Accuracy assessment of the GPS-TEC calibration constants by means of a simulation technique
topic_facet Astronomía
GPS
Differential Code Biases (DCB)
sTEC
Ionosphere
description During the last 2 decades, Global Positioning System (GPS) measurements have become a very important data-source for ionospheric studies. However, it is not a direct and easy task to obtain accurate ionospheric information from these measurements because it is necessary to perform a careful estimation of the calibration constants affecting the GPS observations, the so-called differential code biases (DCBs). In this paper, the most common approximations used in several GPS calibration methods, e.g. the La Plata Ionospheric Model (LPIM), are applied to a set of specially computed synthetic slant Total Electron Content datasets to assess the accuracy of the DCB estimation in a global scale scenario. These synthetic datasets were generated using a modified version of the NeQuick model, and have two important features: they show a realistic temporal and spatial behavior and all a-priori DCBs are set to zero by construction. Then, after the application of the calibration method the deviations from zero of the estimated DCBs are direct indicators of the accuracy of the method. To evaluate the effect of the solar activity radiation level the analysis was performed for years 2001 (high solar activity) and 2006 (low solar activity). To take into account seasonal changes of the ionosphere behavior, the analysis was repeated for three consecutive days close to each equinox and solstice of every year. Then, a data package comprising 24 days from approximately 200 IGS permanent stations was processed. In order to avoid unwanted geomagnetic storms effects, the selected days correspond to periods of quiet geomagnetic conditions. The most important results of this work are: i) the estimated DCBs can be affected by errors around ±8 TECu for high solar activity and ±3 TECu for low solar activity; and ii) DCB errors present a systematic behavior depending on the modip coordinate, that is more evident for the positive modip region.
format Articulo
Articulo
author Conte, Juan Federico
Azpilicueta, Francisco Javier
Brunini, Claudio Antonio
author_facet Conte, Juan Federico
Azpilicueta, Francisco Javier
Brunini, Claudio Antonio
author_sort Conte, Juan Federico
title Accuracy assessment of the GPS-TEC calibration constants by means of a simulation technique
title_short Accuracy assessment of the GPS-TEC calibration constants by means of a simulation technique
title_full Accuracy assessment of the GPS-TEC calibration constants by means of a simulation technique
title_fullStr Accuracy assessment of the GPS-TEC calibration constants by means of a simulation technique
title_full_unstemmed Accuracy assessment of the GPS-TEC calibration constants by means of a simulation technique
title_sort accuracy assessment of the gps-tec calibration constants by means of a simulation technique
publishDate 2011
url http://sedici.unlp.edu.ar/handle/10915/137501
work_keys_str_mv AT contejuanfederico accuracyassessmentofthegpsteccalibrationconstantsbymeansofasimulationtechnique
AT azpilicuetafranciscojavier accuracyassessmentofthegpsteccalibrationconstantsbymeansofasimulationtechnique
AT bruniniclaudioantonio accuracyassessmentofthegpsteccalibrationconstantsbymeansofasimulationtechnique
bdutipo_str Repositorios
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