The variometric approach to real-time high-frequency geodesy

Fratarcangeli, Francesca; Ravanelli, Michela; Mazzoni, Augusto; Colosimo, G.; Benedetti, Elisa; Branzanti, Mara; Savastano, Giorgio; Verkhoglyadova, Olga; Komjáthy, A.; Crespi, Mattia

doi:10.1007/s12210-018-0708-5

Cited by 19 publications

(13 citation statements)

References 35 publications

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“…VARION was successfully applied to the detection of traveling ionospheric disturbances (TIDs) induced by the 2012 Haida Gwaii earthquake and tsunami [11] and by the Illapel earthquake and tsunami [18]. It was also efficaciously applied to ionospheric plasma density depletion caused by the Falcon 9 rocket launch [19].…”

Section: Varionmentioning

confidence: 99%

Real-Time Geophysical Applications with Android GNSS Raw Measurements

2019

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The number of Android devices enabling access to raw GNSS (Global Navigation Satellite System) measurements is rapidly increasing, thanks to the dedicated Google APIs. In this study, the Xiaomi Mi8, the first GNSS dual-frequency smartphone embedded with the Broadcom BCM47755 GNSS chipset, was employed by leveraging the features of L5/E5a observations in addition to the traditional L1/E1 observations. The aim of this paper is to present two different smartphone applications in Geoscience, both based on the variometric approach and able to work in real time. In particular, tests using both VADASE (Variometric Approach for Displacement Analysis Stand-alone Engine) to retrieve the 3D velocity of a stand-alone receiver in real-time, and VARION (Variometric Approach for Real-Time Ionosphere Observations) algorithms, able to reconstruct real-time sTEC (slant total electron content) variations, were carried out. The results demonstrate the contribution that mass-market devices can offer to the geosciences. In detail, the noise level obtained with VADASE in a static scenario—few mm/s for the horizontal components and around 1 cm/s for the vertical component—underlines the possibility, confirmed from kinematic tests, of detecting fast movements such as periodic oscillations caused by earthquakes. VARION results indicate that the noise level can be brought back to that of geodetic receivers, making the Xiaomi Mi8 suitable for real-time ionosphere monitoring.

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Section: Varionmentioning

confidence: 99%

Real-Time Geophysical Applications with Android GNSS Raw Measurements

2019

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“…The study of the October events was conducted by Fratarcangeli et al (2018) to present another approach to GPS data processing. The VADASE (Variometric Approach for Displacements Analysis Stand-alone Engine) software was used to estimate the epoch-by epoch displacements equivalent to inter-epoch mean velocities in real-time using the phase observations from the satellites in two consecutive epochs (Colosimo et al, 2011a;Fratarcangeli et al, 2018a). The results from 1 Hz GPS data were then compared with PPP solution from .…”

Section: Figmentioning

confidence: 99%

Seismic phenomena in tke light high-rate GPS precise point positioning results

Kudłacik¹

2019

Acta Geodynamica Et Geomaterialia

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The motion of GPS permanent stations during three earthquakes has been investigated with the use of Precise Point Positioning (PPP) technique and the data obtained by seismic sensors. The study examines the ability of high-rate GPS observations to reflect the ground motion retrieved by the strong motion instruments (SM), considered to be more reliable and precise. The goal of this article is to show the sensitivity of GPS PPP kinematic high-rate positioning with position domain filtering using the band-pass Butterworth filter on small samples of position time series. The kinematic PPP approach in RTKLib software was used, supported by the CODE precise orbit and clock products to estimate positions from 5-hour long GPS phase datasets. Obtained position time series were reduced to 5-minute samples covering the time of co-seismic motion. The application of Butterworth band-pass filtering of GPS and SM time series increased the agreement between them up to 72% in terms of correlation, resulting in correlations within the range 0.34 to 0.99. The comparison of peak ground displacements (PGD) revealed that for Italian events, GPS-SM absolute value of the average difference is 6 mm with GPS-SM distances within the range of 0.05 to 2.14 km. In all analysed earthquakes, the agreement between GPSgrams and seismograms in terms of the first P-arrival polarity was checked and it was found that it is consistent in all cases. This confirms the GNSS technique capability for determining fault plane solution for earthquakes with magnitudes over 6.

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“…Anyway, it has been demonstrated that for short periods, e.g. during real seismic event, by means of the variometric approach it is possible to retrieve waveforms and co-seismic displacements in real time (Fratarcangeli et al, 2018).…”

Section: Rmse Rangesmentioning

confidence: 99%

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

Tesolin

Vitti

Mazzoni

et al. 2019

Advances in Space Research

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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

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The variometric approach to real-time high-frequency geodesy

Cited by 19 publications

References 35 publications

Real-Time Geophysical Applications with Android GNSS Raw Measurements

Real-Time Geophysical Applications with Android GNSS Raw Measurements

Seismic phenomena in tke light high-rate GPS precise point positioning results

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

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