Accuracy Analysis of International Reference Ionosphere 2016 and NeQuick2 in the Antarctic
Global navigation satellite system (GNSS) can provide dual-frequency observation data, which can be used to effectively calculate total electron content (TEC). Numerical studies have utilized GNSS-derived TEC to evaluate the accuracy of ionospheric empirical models, such as the International Referen...
Published in: | Sensors |
---|---|
Main Authors: | , , , , , , , |
Format: | Text |
Language: | English |
Published: |
Multidisciplinary Digital Publishing Institute
2021
|
Subjects: | |
Online Access: | https://doi.org/10.3390/s21041551 |
id |
ftmdpi:oai:mdpi.com:/1424-8220/21/4/1551/ |
---|---|
record_format |
openpolar |
spelling |
ftmdpi:oai:mdpi.com:/1424-8220/21/4/1551/ 2023-08-20T04:02:25+02:00 Accuracy Analysis of International Reference Ionosphere 2016 and NeQuick2 in the Antarctic Zihuai Guo Yibin Yao Jian Kong Gang Chen Chen Zhou Qi Zhang Lulu Shan Chen Liu 2021-02-23 application/pdf https://doi.org/10.3390/s21041551 EN eng Multidisciplinary Digital Publishing Institute Remote Sensors https://dx.doi.org/10.3390/s21041551 https://creativecommons.org/licenses/by/4.0/ Sensors; Volume 21; Issue 4; Pages: 1551 International Reference Ionosphere model NeQuick model Antarctic GNSS STEC accuracy analysis Text 2021 ftmdpi https://doi.org/10.3390/s21041551 2023-08-01T01:08:00Z Global navigation satellite system (GNSS) can provide dual-frequency observation data, which can be used to effectively calculate total electron content (TEC). Numerical studies have utilized GNSS-derived TEC to evaluate the accuracy of ionospheric empirical models, such as the International Reference Ionosphere model (IRI) and the NeQuick model. However, most studies have evaluated vertical TEC rather than slant TEC (STEC), which resulted in the introduction of projection error. Furthermore, since there are few GNSS observation stations available in the Antarctic region and most are concentrated in the Antarctic continent edge, it is difficult to evaluate modeling accuracy within the entire Antarctic range. Considering these problems, in this study, GNSS STEC was calculated using dual-frequency observation data from stations that almost covered the Antarctic continent. By comparison with GNSS STEC, the accuracy of IRI-2016 and NeQuick2 at different latitudes and different solar radiation was evaluated during 2016–2017. The numerical results showed the following. (1) Both IRI-2016 and NeQuick2 underestimated the STEC. Since IRI-2016 utilizes new models to represent the F2-peak height (hmF2) directly, the IRI-2016 STEC is closer to GNSS STEC than NeQuick2. This conclusion was also confirmed by the Constellation Observing System for Meteorology Ionosphere and Climate (COSMIC) occultation data. (2) The differences in STEC of the two models are both normally distributed, and the NeQuick2 STEC is systematically biased as solar radiation increases. (3) The root mean square error (RMSE) of the IRI-2016 STEC is smaller than that of the NeQuick2 model, and the RMSE of the two modeling STEC increases with solar radiation intensity. Since IRI-2016 relies on new hmF2 models, it is more stable than NeQuick2. Text Antarc* Antarctic MDPI Open Access Publishing Antarctic The Antarctic Sensors 21 4 1551 |
institution |
Open Polar |
collection |
MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
International Reference Ionosphere model NeQuick model Antarctic GNSS STEC accuracy analysis |
spellingShingle |
International Reference Ionosphere model NeQuick model Antarctic GNSS STEC accuracy analysis Zihuai Guo Yibin Yao Jian Kong Gang Chen Chen Zhou Qi Zhang Lulu Shan Chen Liu Accuracy Analysis of International Reference Ionosphere 2016 and NeQuick2 in the Antarctic |
topic_facet |
International Reference Ionosphere model NeQuick model Antarctic GNSS STEC accuracy analysis |
description |
Global navigation satellite system (GNSS) can provide dual-frequency observation data, which can be used to effectively calculate total electron content (TEC). Numerical studies have utilized GNSS-derived TEC to evaluate the accuracy of ionospheric empirical models, such as the International Reference Ionosphere model (IRI) and the NeQuick model. However, most studies have evaluated vertical TEC rather than slant TEC (STEC), which resulted in the introduction of projection error. Furthermore, since there are few GNSS observation stations available in the Antarctic region and most are concentrated in the Antarctic continent edge, it is difficult to evaluate modeling accuracy within the entire Antarctic range. Considering these problems, in this study, GNSS STEC was calculated using dual-frequency observation data from stations that almost covered the Antarctic continent. By comparison with GNSS STEC, the accuracy of IRI-2016 and NeQuick2 at different latitudes and different solar radiation was evaluated during 2016–2017. The numerical results showed the following. (1) Both IRI-2016 and NeQuick2 underestimated the STEC. Since IRI-2016 utilizes new models to represent the F2-peak height (hmF2) directly, the IRI-2016 STEC is closer to GNSS STEC than NeQuick2. This conclusion was also confirmed by the Constellation Observing System for Meteorology Ionosphere and Climate (COSMIC) occultation data. (2) The differences in STEC of the two models are both normally distributed, and the NeQuick2 STEC is systematically biased as solar radiation increases. (3) The root mean square error (RMSE) of the IRI-2016 STEC is smaller than that of the NeQuick2 model, and the RMSE of the two modeling STEC increases with solar radiation intensity. Since IRI-2016 relies on new hmF2 models, it is more stable than NeQuick2. |
format |
Text |
author |
Zihuai Guo Yibin Yao Jian Kong Gang Chen Chen Zhou Qi Zhang Lulu Shan Chen Liu |
author_facet |
Zihuai Guo Yibin Yao Jian Kong Gang Chen Chen Zhou Qi Zhang Lulu Shan Chen Liu |
author_sort |
Zihuai Guo |
title |
Accuracy Analysis of International Reference Ionosphere 2016 and NeQuick2 in the Antarctic |
title_short |
Accuracy Analysis of International Reference Ionosphere 2016 and NeQuick2 in the Antarctic |
title_full |
Accuracy Analysis of International Reference Ionosphere 2016 and NeQuick2 in the Antarctic |
title_fullStr |
Accuracy Analysis of International Reference Ionosphere 2016 and NeQuick2 in the Antarctic |
title_full_unstemmed |
Accuracy Analysis of International Reference Ionosphere 2016 and NeQuick2 in the Antarctic |
title_sort |
accuracy analysis of international reference ionosphere 2016 and nequick2 in the antarctic |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2021 |
url |
https://doi.org/10.3390/s21041551 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Sensors; Volume 21; Issue 4; Pages: 1551 |
op_relation |
Remote Sensors https://dx.doi.org/10.3390/s21041551 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/s21041551 |
container_title |
Sensors |
container_volume |
21 |
container_issue |
4 |
container_start_page |
1551 |
_version_ |
1774712866829500416 |