Journal ArticleDOI
Determination of Differential Code Bias of GNSS Receiver Onboard Low Earth Orbit Satellite
TLDR
An improved DCB estimation method based on the assumption that the LEO-based TEC can reach zero and also optimize the parameter configuration in the commonly used least square method (LSQ method) is proposed.Abstract:
The uncertainty of differential code bias (DCB) is one of the main error sources in the low Earth orbit (LEO) based total electron content (TEC) retrieval, whereas the derivation of the LEO DCB is not systematically studied. In this paper, we propose an improved DCB estimation method (ZERO method) based on the assumption that the LEO-based TEC can reach zero and also optimize the parameter configuration in the commonly used least square method (LSQ method). In the improved ZERO method, the combination of the lower quartile minimum relative TEC during each orbital revolution with the daily minimum relative TEC gives a stable and reliable DCB estimation. For the LSQ method, the 3-TECU cutoff vertical TEC with 10° cutoff elevation is considered to offer a reasonable DCB estimation. Subsequently, Global Positioning System (GPS) observations from multiple LEO satellites at different altitudes are used to study the variability of the LEO DCBs. Our results revealed that the LEO DCBs underwent obvious long-term variation and periodic oscillations of months. Moreover, the CHAMP data illustrated that the long-term variation of LEO DCBs is partly associated with the GPS satellite replacement, and the periodic variation can be attributed to the variation of the hardware thermal status, represented by the receiver CPU temperature in this study.read more
Citations
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Journal ArticleDOI
Long‐duration depletion in the topside ionospheric total electron content during the recovery phase of the March 2015 strong storm
Jiahao Zhong,Jiahao Zhong,Jiahao Zhong,Wenbin Wang,Xinan Yue,Alan G. Burns,Xiankang Dou,Jiuhou Lei +7 more
TL;DR: In this paper, the top-side ionospheric total electron content (TEC) observations from multiple low-Earth orbit (LEO) satellites have been used to investigate the local time, altitudinal, and longitudinal dependence of the topside ionosphere storm effect during both the main and recovery phases of the March 2015 geomagnetic storm.
Journal ArticleDOI
Middle-Latitudinal Band Structure Observed in the Nighttime Ionosphere
Journal ArticleDOI
Longitudinal variations of topside ionospheric and plasmaspheric TEC
TL;DR: The upward-looking ionospheric total electron content (TEC) from the MetOp-A and TSX satellites during 2008-2015 has been used to systematically study the longitudinal variations of the topside ionosphere and plasmasphere as mentioned in this paper.
Journal ArticleDOI
Topside Ionospheric Conditions During the 7–8 September 2017 Geomagnetic Storm
Oluwaseyi Jimoh,Oluwaseyi Jimoh,Jiuhou Lei,Jiuhou Lei,Jiahao Zhong,Charles Owolabi,Xiaoli Luan,Xiankang Dou +7 more
Journal ArticleDOI
Contrasting behavior of the F2 peak and the topside ionosphere in response to the 2 October 2013 geomagnetic storm
Jiuhou Lei,Jiahao Zhong,Tian Mao,Lianhuan Hu,Tao Yu,Xiaoli Luan,Xiankang Dou,Eric K. Sutton,Xinan Yue,Jian Lin,Inez S. Batista +10 more
TL;DR: In this paper, the responses of the F2 peak and the topside ionosphere to the 2 October 2013 geomagnetic storm, particularly during the recovery phase, were investigated using the ionospheric observations from ionosondes, ground-based GPS receivers, GRACE and MetOp-A satellites, and Fabry-Perot interferometer over the Asian-Australian sector.
References
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Journal ArticleDOI
A global mapping technique for GPS‐derived ionospheric total electron content measurements
TL;DR: In this paper, a technique for retrieving the global distribution of vertical total electron content (TEC) from GPS-based measurements is described, based on interpolating TEC within triangular tiles that tessellate the ionosphere modeled as a thin spherical shell.
Journal ArticleDOI
The IGS VTEC maps: a reliable source of ionospheric information since 1998
Manuel Hernández-Pajares,Jesús Juan,Jaume Sanz,R. Orus,Alberto García-Rigo,J. Feltens,Attila Komjathy,Stefan Schaer,Andrzej Krankowski +8 more
TL;DR: In this article, the IGS combined vertical total electron content (VTEC) maps were analyzed and the results confirmed the good performance of the combined VTEC maps, and the characteristic VTEC variability periods.
Journal ArticleDOI
An Automatic Editing Algorithm for GPS data
TL;DR: An algorithm has been developed to edit automatically Global Positioning System data such that outlier deletion, cycle slip identification and correction are independent of clock instability, selective availability, receiver–satellite kinematics, and tropospheric conditions.
Journal ArticleDOI
Calibration errors on experimental slant total electron content (TEC) determined with GPS
TL;DR: The conclusions achieved are: (1) the levelled carrier-phase ionospheric observable is affected by a systematic error, produced by code-delay multi-path through the levelling procedure; and (2) receiver IFB may experience significant changes during 1 day.