Original scientific paper
Single-frequency GPS positioning performance Around the time of the Chilean 2010 earthquake
Renato Filjar
; Faculty of Maritime Studies Rijeka
Serđo Kos
; Faculty of Maritime Studies Rijeka
David Brčić
; Faculty of Maritime Studies Rijeka
Abstract
The earthquakes are known sources of geomagnetic and ionospheric disturbances, although on the restricted geospatial scale. Since such disturbances also affect the radio wave propagation characteristics, it is expected for the earthquakes to cause an impact on the satellite navigation systems’ performance.
In this paper we have reported the results of the single-frequency GPS performance analysis at various locations around the globe at the time of the Chilean 2010 earthquake occurrence. The single-frequency GPS positioning performance at the selected reference sites in the time interval immediately following the Chilean 2010 earthquake outbreak has been analysed, and the GPS recovery time identified. Our study shows considerable short-term GPS performance disturbance observed at every location taken into consideration. The GPS observables collection process mitigates the impact of various GPS positioning error sources, excluding the GPS ionospheric delay and the reference frame shift. A theoretical analysis has shown negligible effects of the reference frame shift on the GPS positioning performance, leaving the ionospheric effects as the most probable cause of the earthquake-induced short-term single-frequency GPS performance degradation around the world.
Keywords
GPS positioning performance; earthquake; GPS ionospheric effects
Hrčak ID:
75329
URI
Publication date:
28.12.2011.
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