Identification and localization of layers in the ionosphere using the eikonal and amplitude of radio occultation signals

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Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/101054

Title:	Identification and localization of layers in the ionosphere using the eikonal and amplitude of radio occultation signals
Authors:	劉說安;Pavelyev, A. G.;Liou, Y. A.;Zhang, K.;Wang, C. S.;Wickert, J.;Schmidt, T.;Gubenko, V. N.;Pavelyev, A. A.;Kuleshov, Y.
Contributors:	太空及遙測研究中心
Keywords:	Atmosphere;Comparative analysis;Internal waves;Ionosphere;Radio waves;Refractivity;Upper atmosphere;Wave propagation;Wind shear
Date:	2012-01-12
Issue Date:	2026-04-21 14:22:16 (UTC+8)
Publisher:	Copernicus Gesellschaft mbH;Katlenburg-Lindau: Copernicus Publications
Abstract:	摘要： By using the CHAllenge Minisatellite Payload (CHAMP) radio occultation (RO) data, a description of different types of the ionospheric impacts on the RO signals at the altitudes 30–90 km of the RO ray perigee is given and compared with the results of measurements obtained earlier in the satellite-to-Earth communication link at frequency 1.5415 GHz. An analytical model is introduced for describing propagation of radio waves in a stratified medium consisting of sectors with spherically symmetric refractivity distribution. This model gives analytical expressions for the phase, bending angle, and refractive attenuation of radio waves and is applied to the analysis of radio wave propagation phenomena along an extended path including the atmosphere and two parts of the ionosphere. The model explains significant amplitude and phase variations at altitudes 30–90 km of the RO ray perigee and attributes them to inclined ionospheric layers. Based on this analytical model, an innovative technique is introduced to locate layers in the atmosphere and ionosphere. A necessary and sufficient criterion is obtained for a layer to be located at the RO ray perigee. This criterion gives both qualitative and quantitative estimation of the displacement of an ionospheric and/or atmospheric layer from the RO ray perigee. This is important, in particular, for determining the location of wind shears and directions of the internal wave propagation in the lower ionosphere, and, possibly, in the atmosphere. 出版者： Katlenburg-Lindau: Copernicus Publications 出版日期： 2012-01-01 出處： Atmospheric measurement techniques, 2012-01, Vol.5 (1), p.1-16 資源來源： Publicly available content database 版權： COPYRIGHT 2012 Copernicus GmbH 版權： Copyright Copernicus GmbH 2012 識別號： ISSN: 1867-8548 識別號： ISSN: 1867-1381 識別號： EISSN: 1867-8548 識別號： DOI: 10.5194/amt-5-1-2012
Appears in Collections:	[Center for Space and Remote Sensing Research ] journal & Dissertation

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