The improved TaiWan Ionospheric Model (TWIM) and ITS applications on GPS positioning

L. C. Tsai, C. W. Zheng, Ernest P. Macalalad, G. H. Chen, M. H. Tien

研究成果: 書貢獻/報告類型會議論文篇章同行評審

摘要

A three-dimensional ionospheric electron density (Ne) model (L.-C. Tsai, C. H. Liu, T. Y. Hsiao, and J. Y. Huang, Radio Sci., 44, doi:10.1029/2009RS004154, 2009) has been named the TaiWan Ionospheric Model (TWIM) and constructed from vertical Ne profiles retrieved from FormoSat3/COSMIC GPS radio occultation measurements. We further improved the TWIM by including global distributed ionosonde foF2 and foE data and qualifying COSMIC Ne profiles based on the empirical orthogonal function (EOF) classification. The improved TWIM also exhibits vertically-fitted α-Chapman-type layers, with distinct F2, F1, E, and D layers, and surface spherical harmonics approaches for the fitted layer parameters including peak density, peak density height, and scale height. These results are useful in investigation of near-Earth space and large-scale Ne distribution. This way the continuity of Ne and its derivatives is also maintained for practical schemes for providing reliable radio propagation predictions. We have presented a numerical and step by step ray-tracing method (L.-C. Tsai, C. H. Liu, and J. Y. Huang, Radio Sci., 45, doi:10.1029/ 2010RS004359, 2010) on the TWIM and including an Earth-centered magnetic dipole and horizontal Ne gradient effects. The ray-tracing methodology has potential applicability to ionospheric correction as applied to GPS positioning. In this paper, ionospheric corrections on both single-receiver and double-receiver L1 GPS code measurements using the TWIM have been presented and evaluated. Its performances with respect with the ionospheric corrections using other ionospheric models are also presented and compared.

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主出版物標題33rd Asian Conference on Remote Sensing 2012, ACRS 2012
頁面1541-1546
頁數6
出版狀態已出版 - 2012
事件33rd Asian Conference on Remote Sensing 2012, ACRS 2012 - Pattaya, Thailand
持續時間: 26 11月 201230 11月 2012

出版系列

名字33rd Asian Conference on Remote Sensing 2012, ACRS 2012
2

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???event.eventtypes.event.conference???33rd Asian Conference on Remote Sensing 2012, ACRS 2012
國家/地區Thailand
城市Pattaya
期間26/11/1230/11/12

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