IDW Ionospheric TEC Interpolation and Accuracy Analysis Considering Latitude and Longitude Anisotropy

ZHU Yongxing; TAN Shusen; MIN Feng; CUI Xianqiang

doi:10.13203/j.whugis20180233

Volume 44 Issue 11

Nov. 2019

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Geomatics and Information Science of Wuhan University > 2019 > 44(11): 1605-1612. > DOI: 10.13203/j.whugis20180233

ZHU Yongxing, TAN Shusen, MIN Feng, CUI Xianqiang. IDW Ionospheric TEC Interpolation and Accuracy Analysis Considering Latitude and Longitude Anisotropy[J]. Geomatics and Information Science of Wuhan University, 2019, 44(11): 1605-1612. DOI: 10.13203/j.whugis20180233

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IDW Ionospheric TEC Interpolation and Accuracy Analysis Considering Latitude and Longitude Anisotropy

ZHU Yongxing^{1, 2, 3,},
TAN Shusen⁴,
MIN Feng^{2, 3},
CUI Xianqiang⁵

1.
Institute of Geospatial Information, Information Engineering University, Zhengzhou 450052, China
2.
State Key Laboratory of Geo-Information Engineering, Xi'an 710054, China
3.
Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China
4.
Beijing Satellite Navigation Center, Beijing 100094, China
5.
School of Geosciences and Info-Physics, Central South University, Changsha 410083, China

Funds:

The National Key Research and Development Program of China 2016YFB0501900

the National Natural Science Foundation of China 41574013

the National Natural Science Foundation of China 41604013

the National Natural Science Foundation of China 41604024

the National Natural Science Foundation of China 41674012

the National Natural Science Foundation of China 41704035

the National Natural Science Foundation of China 41874041

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Author Bio:
ZHU Yongxing, PhD candidate, specializes in satellite navigation and data processing. E-mail:chxyzyx_2008@126.com
Received Date: June 10, 2018
Published Date: November 04, 2019

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Abstract

Abstract

Inverse distance weighting (IDW) is a simple and practical interpolation method. Taking the global ionospheric map (GIM) product as a sample, the latitude and longitude anisotropy of the ionospheric total electron content (TEC) distribution is taken into account with an introduction of the latitude and longitude adjustment factor r. Six ionospheric distance calculation schemes are used for testing and results show that the correlation of the ionospheric TEC with the longitude direction is higher than the latitude direction and different ionospheric distance calculation schemes can effectively improve the IDW interpolation accuracy. Using the IDW interpolation based on an optimal scheme, a long-term interpolation accuracy is analyzed and results show that the precision of the optimal scheme interpolation is about 25% higher than the general IDW interpolation precision in the ionospheric activity area (20° north and south latitude) for GIM data before and after spring vernal and summer solstice, autumnal equinox and winter solstice in 12 consecutive years. When the ionospheric activity was active at 3-5 hours after 14 o'clock in the local time of 2014, the interpolation accuracy base on the optimal scheme was improved obviously with an interpolation error smaller than 4.0 TECU.

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IDW Ionospheric TEC Interpolation and Accuracy Analysis Considering Latitude and Longitude Anisotropy

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