Analysis of Second Order Ionospheric Effects on Atmospheric Parameters Estimation in Radio Occultation

AN Jiachun; DU Yujun; QU Xiaochuan; YANG Jian

doi:10.13203/j.whugis20150228

Volume 40 Issue 11

Nov. 2015

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Geomatics and Information Science of Wuhan University > 2015 > 40(11): 1440-1445. > DOI: 10.13203/j.whugis20150228

AN Jiachun, DU Yujun, QU Xiaochuan, YANG Jian. Analysis of Second Order Ionospheric Effects on Atmospheric Parameters Estimation in Radio Occultation[J]. Geomatics and Information Science of Wuhan University, 2015, 40(11): 1440-1445. DOI: 10.13203/j.whugis20150228

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Analysis of Second Order Ionospheric Effects on Atmospheric Parameters Estimation in Radio Occultation

1.
Chinese Antarctic Center of Surveying and Mapping, Wuhan University, Wuhan 430079, China;
2.
School of Civil Engineering, Hefei University of Technology, Hefei 230009, China;
3.
School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China

Funds: The National Natural Science Foundation of China, Nos. 41204028, 41231064;the Fundamental Research Funds for the Central Universities, Nos. 2042014kf0266, JZ2014HGBZ0345.

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Received Date: April 19, 2015
Published Date: November 04, 2015

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Abstract

In the study of atmospheric inversion based on radio occultation, the residual ionospheric errors have great influence on the accuracy and the second order errors are not ignorable. In this paper, MSIS90 atmospheric model, 3D NeUoG ionospheric model and IGRF11 geomagnetic model are all collected, and 3D ray tracing method was used to simulate the changes of the second order residual ionospheric errors in radio occultation. Under different solar activities, local time, azimuth, the second order errors were analyzed, especially for its global distribution. The results show that second order errors are usually in sub-centimeter level, but up to centimeter level under higher solar activity or in middle and low latitudes at 0° or 180° azimuth, and illustrate the structure of “three-peak” in globe. Therefore, in the occultation data process, the ionospheric monitoring must be strengthened and second order ionospheric errors must be eliminated effectively.
- occultation,
- second order residual ionospheric errors,
- ray tracing,
- simulation

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