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Application of ionospheric tomography to real‐time GPS carrier‐phase ambiguities Resolution, at scales of 400–1000 km and with high geomagnetic activity
Author(s) -
HernándezPajares M.,
Juan J. M.,
Sanz J.,
Colombo O. L.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl011239
Subject(s) - global positioning system , ionosphere , earth's magnetic field , remote sensing , geodesy , ambiguity resolution , geology , gps signals , satellite , meteorology , computer science , geophysics , physics , assisted gps , gnss applications , telecommunications , magnetic field , astronomy , quantum mechanics
The influence of the ionosphere can be one of the main obstacles to GPS carrier phase ambiguity resolution in real‐time, particularly over long baselines. This is important to all users of GPS requiring sub‐decimeter positioning, perhaps in real time, especially with high geomagnetic activity or close to the Solar Maximum. Therefore, it is desirable to have a precise estimation of the ionospheric delay in real‐time, to correct the data. In this paper we asses a real‐time tomographic model of the ionosphere created using dual‐frequency phase data simultaneously collected with the receivers of a network of stations in the USA and Canada, with separations of 400–1000 km, during a period of high geomagnetic activity (Kp=6). When the tomographic ionospheric correction is included, the resolution on‐the‐fly (OTF) of the widelane double‐differenced ambiguities at the reference stations is nearly 100% successful for satellite elevations above 20 degrees, while the resolution of the L 1 , L 2 ambiguities at the rover is typically more than 80% successful.