Impact of Galileo data on the solutions of the variometric approach for displacement analysis

Abstract

The Variometric Approach for Displacement Analysis Standalone Engine (VADASE) was successfully applied for seismological and monitoring purposes using GPS observations. In this work, GPS inter-operable and specific signals transmitted by Galileo satellites were considered to evaluate the impact of Galileo observations on VADASE solutions. The repetition period of the Galileo constellation was investigated to identify the time-windows with the most abundant number of Galileo satellites. Observation packages of about 15 min at 1 Hz were analyzed. Comparisons between the GPS derived and the Galileo derived VADASE solutions were performed after the identification of satellite configurations presenting the same number of satellites and similar geometries. Galileo and GPS combined solutions were also investigated. Single frequency and iono-free phase observations from a set of IGS-MGEX sites were processed in order to evaluate the sensitivity of the

Evaluation of the single-frequency variometric approach based on low-cost GNSS observations and different satellite combinations for detecting short-term dynamic behaviors

“…For instance, Geng et al examined the VA performance with GPS and GPS + BeiDou observations at a 5 Hz sampling rate to determine large displacements caused by a mega-earthquake, and they reported that the combination of GPS and BeiDou detected seismic waveforms of about 20% better than the single system [15]. Tesolin et al conducted a zero-displacement experiment to examine the contribution of Galileo observations at a 1 Hz sampling rate to the VA technique, and they stated that GPS + Galileo observations are better than single-system solutions [16]. Zang et al employed GPS, GLONASS, and BeiDou observations at a 1 Hz sampling rate to evaluate the ability of the VA method in earthquake magnitude estimation, and they reported that multi-GNSS observations provide more reliable displacement compared to a single system [17].…”