Influence of ionospheric and magnetospheric disturbances on failures of the global navigation satellite systems.

The paper investigates the dynamics of failures of the radiophysical parameters of GLONASS and GPS signals, as well as the failures in the process of determination of the total electronic content (TEC) at mid- and high-latitude stations under various geophysical conditions for the period November 2014 – July 2015. It is shown that the failure density of P1 pseudo-range measurement at high latitudes for the GLONASS system is lower than that for GPS. In the middle latitudes, the average failure density of N1 TECU/min during calm geomagnetic conditions practically does not depend on the behavior of Kp and AE indices and does not exceed 12%. At high latitudes, N1 TECU/min is generally higher in winter than in summer, and can reach 50-60%. The change in N1 TECU/min at high latitudes correlates with the behavior of geomagnetic indices. However, it depends on Kp and AE in significantly different ways. During disturbed conditions, N1 TECU/min increases with the growth of AE more slowly than during calm conditions, and the increase of N1 TECU/min with the growth of Kp during disturbed conditions, on the contrary, occurs 1.5 times faster than during calm geomagnetic environment. The dependences of the value N1 TECU/min on the ionospheric disturbance index Wtec at medium and high latitudes are similar. The increase in the failure density of the N1 TECU/min PES with the growth of Wtec in winter occurs 1.5 times faster than in summer. At the same time, at high latitudes, an increase in N1 TECU/min with an increase in Wtec occurs approximately 2-2.5 times faster than at medium latitudes.

Yu.V. Yasyukevich, I.V. Zhivetyev, A.S. Yasyukevich, S.V. Voeykov, V.I. Zakharov, N.P. Perevalova, N.N. Titkov. Influence of ionospheric and magnetospheric disturbances on failures of global navigation satellite systems. \\Modern problems of remote sensing of the Earth from space. 2017. Vol. 14. No. 1. pp. 88-98 DOI: 10.21046/2070-7401-2017-14-1-88-98