Abstract
The state of the ionosphere affects the operational stability of satellite radio navigation systems. The dense network of GEONET GPS sites on the territory of Japan allows to conduct a thorough investigation of the stability of system operation at mid-latitudes in different heliogeophysical conditions. This paper considers deterioration in the accuracy of GPS system positioning due to the effect of a large-scale ionospheric disturbance (an ionospheric bubble) over Japan on February 12, 2000.
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