Interferometric Synthetic Aperture Radar (InSAR) and the Global Positioning System (GPS) are commonly used to obtain surface topography and surface motions for the study of crustal deformation. Because both of these systems operate from satellites high above the Earth’s surface, the arrival time of the propagating signals is delayed as the signals travel through the Earth’s ionosphere. As a res...

In this paper equatorward propagating large scale traveling ionospheric disturbance (LSTID) on 17 March 2015 were investigated using the Statistical Angle-of-Arrival and Doppler Method for GPS (SADM-GPS) radio interferometry technique in data-scarce East Africa. To apply SADM-GPS method, 5 arrays each with 3 receivers arranged a triangular geometry used. Our results show that during 15:00–18:00...

A method for the removal of ionospheric effects from single-frequency non-GPS radio navigation data through the use of data collected from a single collocated dualfrequency GPS receiver is presented. The method uses a local ionosphere model to estimate the total electron content (TEC) along any line of sight that differs from the GPS satellite lines of sight. Two novel models are investigated, ...

Tsunamis have been a significant threat to humans living in coastal regions throughout recorded history. The recent tsunami of September 29, 2009 was a tragic reminder of this fact, as the waves caused over 180 deaths on the islands of Samoa, American Samoa, and Apia in the south Pacific. Recent modeling results and observations have demonstrated that the ionospheric signature of an ocean tsuna...

To investigate the temporal-spatial distribution and evolutions of global Total Electron Content (TEC), we estimate the global TEC data from 1999 to 2013 by processing the GPS data collected by the International Global Navigation Satellite System (GNSS) Service (IGS) stations, and robustly constructed the TEC time series at each of the global 5°×2.5° grids. We found that the spatial distributio...

The GPS derived TEC disturbances before earthquakes were discovered in the last years using global and regional TEC maps, TEC measurements over individual stations as well as measurements along individual GPS satellite passes. For strong mid-latitudinal earthquakes the seismo-ionospheric anomalies look like local TEC enhancements or decreases located in the vicinity of the forthcoming earthquak...

This paper discusses the occurrence of Global Positioning System (GPS) loss lock events obtained by considering total electron content (TEC) measurements carried out three satellites European Space Agency Swarm constellation from December 2013 to 2020, which represents longest dataset ever used perform such an analysis. After describing approach classify a GPS lock, corresponding is analyzed as...

This paper presents results from an investigation of ionospheric delay that might influence GBAS (GroundBased Augmentation System) especially with a focus to local-scale spatial gradient using the nation-wide dense GPS network in Japan (GEONET; GPS earth observation network), which currently consists of about 1,000 GPS stations with a typical separation of 20 km. GBAS is a system based on the d...