Identification of significant periodicities in daily GPS time series using least-squares spectral analysis

Nobakht-Ersi, Fereydoun; Gamse, Sonja; Sharifi, Mohammad Ali

doi:10.1007/s12517-016-2468-9

Cited by 2 publications

(1 citation statement)

References 7 publications

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“…The influence of local environmental effects such as rain, temperature, or earth crust load on the coordinate time series of selected IGS (International GNSS Service) stations was analysed by continuous wavelet transform signal reconstruction . The residual time series after adopting a site motion model, which is used on the time series of permanent GPS/GNSS stations for analysing crustal deformations and other geophysical phenomena of plate tectonics, were analysed for underlying periodicities by LSSA in Nobakht et al In Erol, the LSSA was used on time series captured by inclination sensors and GPS data for continuous monitoring of a tall building in order to detect natural frequencies and possible anomalies. In Zhang et al, the authors adopted a fast FT algorithm for detecting the local dominant frequencies of two sets of GNSS real bridge data.…”

Section: Mathematical Backgroundmentioning

confidence: 99%

Analysis of periodicities in long‐term displacement time series in concrete dams

Gamse

Henriques

Oberguggenberger

et al. 2019

Struct Control Health Monit

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The hydrostatic-season-time (HST) model is a widely used method in the safety assessment of dams and for the estimation of reversible and irreversible deformations due to different load scenarios. After implementing an optimal HST-model to observational data, the residual time series can still expose some underlying periodicities. In our contribution, the underlying periodicities and their contribution to residual minimisation are further analysed by the Lomb-Scargle normalised periodogram frequency method. The extended HST-model, obtained by adding additional sinusoidal terms for the statistically most significant frequencies, presents a slight statistical improvement on the optimal HST-model. Statistically significant frequencies may not be justified or correlated to some physical process of the dam, but they make it possible to identify a pattern in the analysed period. The analyses are performed for the radial direction of long-term displacement time series measured at the topmost reading station of an inverted pendulum system in the central cantilever of the Alqueva concrete arch dam. KEYWORDSconcrete arch dam, false alarm probability, hydrostatic-season-time model, Lomb-Scargle normalised periodogram, multiple linear regression

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Section: Mathematical Backgroundmentioning

confidence: 99%

Analysis of periodicities in long‐term displacement time series in concrete dams

Gamse

Henriques

Oberguggenberger

et al. 2019

Struct Control Health Monit

Self Cite

View full text Add to dashboard Cite

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A Compact GPS Surface Drifter with LoRa Telemetry and Self-Contained Tracking System

Robinson¹,

Esty²,

Tilburg³

2021

mar technol soc j

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Shallow marine environments are characterized by complex and variable physical processes that have significance for biological and human communities. However, the global disparity in scientific resources limits examination of the coastal ocean in some regions, so the development of universal and accessible technologies is needed. We combined a compact, GPS-equipped drifter design with long-range (LoRa) radio telemetry and a receiver system housed on a research vessel to develop a low-cost, easily assembled system of drifters. LoRa transmission of real-time location data while deployed was used to increase recoverability, minimizing the initial and long-term costs of constructing and maintaining the operation of this drifter system. Bench and field testing confirmed the performance of the system, which was optimized for LoRa transmission, which is compromised when occurring near the sea surface. The swift currents, complex coastline, and varied sea states present in our study area provided a rigorous testing environment for the drifter system. We established the working limits of battery life and LoRa data transmission within our configuration of transmitters and receiver, evaluated the accuracy of the GPS receivers, and determined the most robust variant of the drifter body design. This study offers proof of concept for a radio-tracked drifter system that is ready for deployment to track nearshore surface currents. Both the drifter system and the data telemetry protocol can be adapted to other investigations of the marine environment by integrating new sensors, modifying the configuration or deployment procedure, or applying LoRa radios to transfer data from fixed sensing platforms.

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Identification of significant periodicities in daily GPS time series using least-squares spectral analysis

Cited by 2 publications

References 7 publications

Analysis of periodicities in long‐term displacement time series in concrete dams

Analysis of periodicities in long‐term displacement time series in concrete dams

A Compact GPS Surface Drifter with LoRa Telemetry and Self-Contained Tracking System

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