Degradation of GPS performance in geomagnetically disturbed conditions

During geomagnetically disturbed conditions, the accuracy and quality of GPS performance is impaired. Unlike geomagnetically quiet conditions, magnetic storm conditions are accompanied by an increase in the spherical standard deviation of the position determination for all types of GPS receivers. In magnetic storm conditions there is an increase in the number of slips of the one-frequency mode of coordinate determination. We have identified an unambiguous tendency of the slip density of the one-frequency mode to increase for the ASHTECH and TRIMBLE GPS receivers. For the AOA receivers this tendency was not observed in any of the cases considered. The slip density in the two-frequency mode of coordinate determination in magnetic storm conditions increases most dramatically for the ASHTECH receivers. Regarding the TRIMBLE receivers, there is a similar, but less clearly pronounced, picture. No slips of the two-frequency mode were detected for the AOA receivers in the cases under consideration.

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