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New higherorder correction of gnss ro bending angles accounting for ionospheric asymmetry: Evaluation of performance and added value
Alternative Title20204609482447
Liu, Congliang1,2; Kirchengast, Gottfried2,3,4; Syndergaard, Stig5; Schwaerz, Marc2,3,4; Danzer, Julia2,3,4; Sun, Yueqiang1,2,3
Source PublicationRemote Sensing
2020
Volume12Issue:21Pages:1-23
DOI10.3390/rs12213637
Language英语
KeywordBoron compounds - Communication satellites - Geomagnetism - Global positioning system - Ionosphere - Radio navigation - Refractive index Frequency correction - Geomagnetic field vectors - Geomagnetic fields - Global Navigation Satellite Systems - Ionospheric errors - Local corrections - Low earth orbit satellites - Radio occultations
AbstractThe residual ionospheric error (RIE) from higherorder 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 higherorder bending angle RIE correction named "Bilocal correction approach" has been implemented and evaluated, which accounts for the ray path splitting of the dualfrequency 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 testday ensembles of RO events show that, over the upper stratosphere and mesosphere, the order of magnitude of the mean total RIE in the bilocal correction approach is 0.01 μrad. Related to this, the socalled electron-densitysquared (Ne2) 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 Ne2 term is generally negative. We evaluated the new approach against the existing "Kappa approach" and the standard linear dualfrequency 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 bilocal approach can provide added value for RO missions with low LEO altitudes and for regionalscale applications, where its capacity to account for the ionospheric inboundoutbound asymmetry as well as for the geomagnetic term plays out. © 2020 by the authors. Licensee MDPI, Basel, Switzerland.
Indexed ByEI
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Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/7481
Collection中国科学院国家空间科学中心
Affiliation1.National Space Science Center, Chinese Academy of Sciences (NSSC/CAS) and Beijing Key Laboratory of Space Environment Exploration, Beijing; 100000, China;
2.Joint Laboratory on Occultations for Atmosphere and Climate (JLOAC) of NSSC/CAS, Beijing, China;
3.University of Graz, Graz; 8010, Austria;
4.Wegener Center for Climate and Global Change (WEGC) and Institute for Geophysics, Astrophysics, and Meteorology/Institute of Physics, University of Graz, Graz; 8010, Austria;
5.Danish Meteorological Institute (DMI), Copenhagen; 1050, Denmark
Recommended Citation
GB/T 7714
Liu, Congliang,Kirchengast, Gottfried,Syndergaard, Stig,et al. New higherorder correction of gnss ro bending angles accounting for ionospheric asymmetry: Evaluation of performance and added value[J]. Remote Sensing,2020,12(21):1-23.
APA Liu, Congliang,Kirchengast, Gottfried,Syndergaard, Stig,Schwaerz, Marc,Danzer, Julia,&Sun, Yueqiang.(2020).New higherorder correction of gnss ro bending angles accounting for ionospheric asymmetry: Evaluation of performance and added value.Remote Sensing,12(21),1-23.
MLA Liu, Congliang,et al."New higherorder correction of gnss ro bending angles accounting for ionospheric asymmetry: Evaluation of performance and added value".Remote Sensing 12.21(2020):1-23.
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