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New Higher-Order Correction of GNSS RO Bending Angles Accounting for Ionospheric Asymmetry: Evaluation of Performance and Added Value
Alternative TitleWOS:000589300200001
Liu, Congliang1,2,3,4,5; Kirchengast, Gottfried2,3,4,5; Syndergaard, Stig6; Schwaerz, Marc2,3,4,5; Danzer, Julia2,3,4,5; Sun, Yueqiang1,4,5
Source PublicationREMOTE SENSING
2020
Volume12Issue:21Pages:3637
DOI10.3390/rs12213637
Language英语
KeywordGNSS radio occultation bending angle retrieval residual ionospheric errors bi-local correction approach Kappa correction approach INTEGRATING UNCERTAINTY PROPAGATION RADIO OCCULTATION MEASUREMENTS ERRORS IMPACT RETRIEVAL MODEL SIMULATION
AbstractThe residual ionospheric error (RIE) from higher-order terms in the refractive index is not negligible when using global navigation satellite system (GNSS) radio occultation (RO) data for climate and meteorology applications in the stratosphere. In this study, a new higher-order bending angle RIE correction named Bi-local correction approach has been implemented and evaluated, which accounts for the ray path splitting of the dual-frequency GNSS signals, the altitude of the low Earth orbit (LEO) satellite, the ionospheric inbound (GNSS to tangent point) vs. outbound (tangent point to LEO) asymmetry, and the geomagnetic field. Statistical results based on test-day ensembles of RO events show that, over the upper stratosphere and mesosphere, the order of magnitude of the mean total RIE in the bi-local correction approach is 0.01 mu rad. Related to this, the so-called electron-density-squared (Ne-2) and geomagnetic (BNe) terms appear to be dominant and comparable in magnitude. The BNe term takes negative or positive values, depending on the angle between the geomagnetic field vector and the direction of RO ray paths, while the Ne-2 term is generally negative. We evaluated the new approach against the existing Kappa approach and the standard linear dual-frequency correction of bending angles and found it to perform well and in many average conditions similar to the simpler Kappa approach. On top of this, the bi-local approach can provide added value for RO missions with low LEO altitudes and for regional-scale applications, where its capacity to account for the ionospheric inbound-outbound asymmetry as well as for the geomagnetic term plays out.
Indexed BySCI
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7585
Collection中国科学院国家空间科学中心
Affiliation1.Chinese Acad Sci NSSC CAS, Natl Space Sci Ctr, Beijing 100190, Peoples R China
2.Beijing Key Lab Space Environm Explorat, Beijing 100190, Peoples R China
3.Karl Franzens Univ Graz, Wegener Ctr Climate & Global Change WEGC, A-8010 Graz, Austria
4.Karl Franzens Univ Graz, Inst Geophys Astrophys & Meteorol, Inst Phys, A-8010 Graz, Austria
5.Chinese Acad Sci, Joint Lab Occultat Atmosphere & Climate JLOAC NSS, Beijing 100190, Peoples R China
6.Karl Franzens Univ Graz, A-8010 Graz, Austria
7.Danish Meteorol Inst DMI, DK-2100 Copenhagen, Denmark
Recommended Citation
GB/T 7714
Liu, Congliang,Kirchengast, Gottfried,Syndergaard, Stig,et al. New Higher-Order Correction of GNSS RO Bending Angles Accounting for Ionospheric Asymmetry: Evaluation of Performance and Added Value[J]. REMOTE SENSING,2020,12(21):3637.
APA Liu, Congliang,Kirchengast, Gottfried,Syndergaard, Stig,Schwaerz, Marc,Danzer, Julia,&Sun, Yueqiang.(2020).New Higher-Order Correction of GNSS RO Bending Angles Accounting for Ionospheric Asymmetry: Evaluation of Performance and Added Value.REMOTE SENSING,12(21),3637.
MLA Liu, Congliang,et al."New Higher-Order Correction of GNSS RO Bending Angles Accounting for Ionospheric Asymmetry: Evaluation of Performance and Added Value".REMOTE SENSING 12.21(2020):3637.
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