Ill-posedness of GNSS-based ionospheric tomography affects the stability and accuracy inversion results. Truncated singular value decomposition (TSVD) is a common algorithm reconstruction. However, TSVD method usually has low reconstruction efficiency. To resolve above problem, truncated mapping (TMSVD) presented to improve reconstructed computational authenticate effectiveness advantages TMSVD...

The global positioning system (GPS) is one of the most important and useful technology that has been developed for information and communication technology. The propagated wireless signals along GPS link are affected by the ionospheric electron density irregularities, so the GPS signals may experience amplitude and phase fluctuations. The global navigation satellite system (GNSS) ionospheric sc...

Standalone Global Navigation Satellite System (GNSS) is inadequate for precise navigation of aircrafts. Ground-based Augmentation System (GBAS) augments the performance of GNSS for civil aviation by providing differential corrections to the position of an aircraft during takeoff and landing. Ionospheric gradients affect the accuracy of GNSS and they can be detected and characterized from GNSS o...

8 Long-term variability has previously been observed in the relative magnitude of annual and 9 semi-annual variations in the critical frequency (related to the peak electron concentration) of 10 the ionospheric F2 layer (foF2). In this paper we investigate the global patterns in such 11 variability by calculating the time varying power ratio of semi-annual to annual components 12 seen in ionosp...

1 Institute of Geophysics, National Autonomous University of Mexico, Mexico D.F., Mexico *Corresponding author address: Prof. Sergey Pulinets, Institute of Geophysics, UNAM, Ciudad Universitaria, Delegacion Coyoacan, 04510, Mexico D.F., Mexico; E-mail: [email protected] This paper accumulates the recent advances in scientific understanding of the problem of seismo-ionospheric coupling. Pr...

A high-accuracy Global Ionosphere Model (GIM) is significant for precise positioning and navigating with the Global Navigation Satellite System (GNSS), as well as space weather applications. To obtain a precise GIM, it is critical to take both the ionospheric observable and mathematical model into consideration. In this contribution, the undifferenced ambiguity-fixed carrier-phase ionospheric o...