Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/6380
AuthorsSilva, Heloisa A.* 
Monico, Joao Francisco Galera* 
Aquino, Marcio H. O.* 
De Franceschi, Giorgiana* 
Alfonsi, Lucilla* 
Romano, Vincenzo* 
Spogli, Luca* 
Mitchell, Cathryn M.* 
Dodson, Alan* 
TitleMitigation of ionospheric effects on GNSS positioning over Antarctica: a case study during low solar activity
Issue Date3-Aug-2010
URIhttp://hdl.handle.net/2122/6380
KeywordsGNSS Scintillation
mitigation techniques
Subject Classification01. Atmosphere::01.02. Ionosphere::01.02.07. Scintillations 
AbstractThe aim of this study is to investigate the performance of a method based on improving the stochastic model to mitigate ionospheric scintillation effects on GNSS positioning by processing experimental data from GISTM (GPS Ionospheric Scintillation and TEC Monitor) receivers, which are capable of computing amplitude and phase scintillation parameters from GPS signals. We applied the approach to mitigate ionospheric scintillation effects on GNSS positioning, in conjunction with the estimation of an ionospheric parameter, considered as a stochastic process. This approach produced, in a single epoch point positioning solution, an improvement on height and 3D accuracy of the order of 31% and of 45%, respectively, when applied in a northern high latitude GISTM network under a moderate scintillation scenario. In this project we investigated the case study of 21 November 2009 using data from GISTM stations located in Antarctica and applying the same scintillation mitigation approach to a Precise Point Positioning (PPP) solution. We used an in-house software under development at Unesp. Despite the solar activity being very low, observations from ACE indicated the influence of a recurrent coronal hole high speed stream. Solar wind speed ranged from 430 to 575 km/s, with Bz fluctuations from -8 to +9 nT, generally leading to the formation of ionospheric irregularities responsible of scintillation effects on GNSS signals. Preliminary results from this case study in the PPP mode are encouraging, showing improvements of the order of 26% in 3D accuracy when applying the proposed scintillation stochastic modeling.
Appears in Collections:Conference materials

Files in This Item:
File Description SizeFormat 
Poster_OSC_Helo_Final_ha_MAGal.pdf338.77 kBAdobe PDFView/Open
Show full item record

Page view(s)

88
Last Week
0
Last month
checked on Jun 23, 2017

Download(s)

343
checked on Jun 23, 2017

Google ScholarTM

Check