Practical aspects of the inversion of ionospheric radio occultation data using the Abel transform and its inverse are discussed. The linear inverse transform exhibits poor error propagation characteristics, producing significant artifacts preferentially at low altitudes where they might easily be mistaken for intermediate or sporadic layers in the ionosphere. Tikhonov regularization, which can be viewed as fixed linear filtering, reduces the artifacts at the expense of discarding fine structure in the profiles. Improved results are obtained using maximum entropy and Bayesian statistics. The maximum entropy algorithm can be viewed as a nonlinear adaptive filter which suppresses artifacts while preserving fine structure to the degree the data can support. Other advantages of and avenues for improving the basic maximum entropy algorithm are discussed.
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Shanghai Univ, Shanghai Inst Appl Math & Mech, Shanghai 200030, Peoples R China
Wenzhou Univ, Sch Math Sci, Wenzhou 325000, Peoples R ChinaShanghai Univ, Shanghai Inst Appl Math & Mech, Shanghai 200030, Peoples R China
Xu Xian-Sheng
Hong Zhen-Jie
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Wenzhou Univ, Sch Math Sci, Wenzhou 325000, Peoples R ChinaShanghai Univ, Shanghai Inst Appl Math & Mech, Shanghai 200030, Peoples R China
Hong Zhen-Jie
Guo Peng
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Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R ChinaShanghai Univ, Shanghai Inst Appl Math & Mech, Shanghai 200030, Peoples R China
Guo Peng
Liu Rong-Jian
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Wenzhou Univ, Sch Math Sci, Wenzhou 325000, Peoples R ChinaShanghai Univ, Shanghai Inst Appl Math & Mech, Shanghai 200030, Peoples R China
机构:
RMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, AustraliaRMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, Australia
Hu, Andong
Carter, Brett
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RMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, AustraliaRMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, Australia
Carter, Brett
Currie, Julie
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RMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, AustraliaRMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, Australia
Currie, Julie
Norman, Robert
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RMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, AustraliaRMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, Australia
Norman, Robert
Wu, Suqin
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RMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, AustraliaRMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, Australia
Wu, Suqin
Wang, Xiaoming
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Chinese Acad Sci, Acad Optoelect, Beijing, Peoples R ChinaRMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, Australia
Wang, Xiaoming
Zhang, Kefei
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RMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, Australia
China Univ Min & Technol, Sch Environm Sci & Spatial Informat, Xuzhou, Jiangsu, Peoples R ChinaRMIT Univ, Space Res Ctr, Sch Sci, Melbourne, Vic, Australia