Influence of GPS/GLONASS differential code biases on the determination accuracy of the absolute total electron content in the ionosphere

Systematic error arises when the total electron content (TEC) is estimated with the simultaneous use of phase and code GPS/GLONASS measurements. This is related to the different signal propagation times at L 1 and L 2 frequencies in the radio frequency path of the transmitting and receiving equipmen...

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Bibliographic Details
Published in:Geomagnetism and Aeronomy 2015-11, Vol.55 (6), p.763-769
Main Authors: Yasyukevich, Yu. V., Mylnikova, A. A., Kunitsyn, V. E., Padokhin, A. M.
Format: Article
Language:English
Subjects:
Algorithms
Bias
Earth and Environmental Science
Earth Sciences
Geophysics/Geodesy
Global positioning systems
GLONASS
GPS
Humidity
Ionosphere
Magnetic fields
Seasonal variations
Solar activity
Solar physics
Stations
Total Electron Content
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Summary:Systematic error arises when the total electron content (TEC) is estimated with the simultaneous use of phase and code GPS/GLONASS measurements. This is related to the different signal propagation times at L 1 and L 2 frequencies in the radio frequency path of the transmitting and receiving equipment, the so-called differential code biases. A differential code bias of 1 ns results in an error of ~2.9 TECU when TEC is determined. Differential code bias variations on a long time interval, which were obtained at the CODE laboratory, were analyzed. It has been found that the systematic variation in these biases and considerable seasonal variations apparently caused by the environmental state (temperature and humidity), which sometimes reach 20 TECU (in TEC units), are observed for several stations. The algorithm for determining differential code biases at an individual station and the results of correction for absolute slant TEC are also presented. Presented results show algorithm effectiveness for various geographical regions and solar activity.
ISSN:0016-7932
1555-645X
0016-7940
DOI:10.1134/S001679321506016X