All Outputs (26)

An Evaluation of Optimization Algorithms for the Optimal Selection of GNSS Satellite Subsets (2024)
Journal Article

Continuous advancements in GNSS systems have led, apart from the broadly used GPS, to the development of other satellite systems (Galileo, BeiDou, GLONASS), which have significantly increased the number of available satellites for GNSS positioning ap... Read More about An Evaluation of Optimization Algorithms for the Optimal Selection of GNSS Satellite Subsets.

Assessment Accuracy of Standard Point Positioning Enhanced by Observation and Position Domain Filtering Utilizing a Multi-Epoch Least-Squares Integration Method (2024)
Journal Article

To enhance the positioning accuracy of standalone GNSS receivers in environments unable to provide precise ephemeris and clock offset, such as undeveloped forest areas that lack network communication and power supply, this study employed the Time Dif... Read More about Assessment Accuracy of Standard Point Positioning Enhanced by Observation and Position Domain Filtering Utilizing a Multi-Epoch Least-Squares Integration Method.

Detection of GNSS antenna oscillatory motion and multipath conditions via exploitation of multipath-induced SNR variations (2023)
Journal Article

The multipath effect is well known as one of the dominant error sources in most high-precision GNSS applications, as its site-dependent and fast-changing nature render it challenging to model and mitigate using differencing techniques. However, in th... Read More about Detection of GNSS antenna oscillatory motion and multipath conditions via exploitation of multipath-induced SNR variations.

Monitoring the dynamic response of a pedestrian bridge by using low-cost GNSS receivers (2023)
Journal Article

The development of low-cost GNSS receivers with carrier-phase measurement capacity has led to low-budget GNSS applications of higher accuracy and precision. Recent studies have mainly been carried out with those low-cost receivers for landslide monit... Read More about Monitoring the dynamic response of a pedestrian bridge by using low-cost GNSS receivers.

Assessment of the accuracy of low-cost multi-GNSS receivers in monitoring dynamic response of structures (2022)
Journal Article

The monitoring of bridges is a crucial operation for their structural health examination and maintenance. GNSS technology is one of the methods which are applied with the main advantage that the direct measurement of the bridge displacement is conduc... Read More about Assessment of the accuracy of low-cost multi-GNSS receivers in monitoring dynamic response of structures.

Feasibility analysis of the performance of low-cost GNSS receivers in monitoring dynamic motion (2022)
Journal Article

The development of low-cost GNSS receivers broadens their applications, such as deformation monitoring, which have been performed routinely by survey-grade GNSS receivers. To evaluate the performance of low-cost GNSS receivers, we assessed the precis... Read More about Feasibility analysis of the performance of low-cost GNSS receivers in monitoring dynamic motion.

Monitoring the Dynamics of Formby Sand Dunes Using Airborne LiDAR DTMs (2021)
Journal Article

Coastal dunes play an important role in coastal erosion risk management, where they act as a dynamic natural sea defence line. Formby coast is part of the Sefton coast in the Northwest of England and is one of the largest and most rapidly evolving sa... Read More about Monitoring the Dynamics of Formby Sand Dunes Using Airborne LiDAR DTMs.

Monitoring the response of Severn Suspension Bridge in the United Kingdom using multi-GNSS measurements (2021)
Journal Article

The application of GPS in bridge monitoring aims to determine accurately and precisely the response of the deck and towers of the bridge and estimate the main response characteristics (amplitude and modal frequencies). The main requirement of GPS mon... Read More about Monitoring the response of Severn Suspension Bridge in the United Kingdom using multi-GNSS measurements.

Pass-by-Pass Ambiguity Resolution in Single GPS Receiver PPP Using Observations for Two Sequential Days: An Exploratory Study (2021)
Journal Article

“Pass-by-pass” or “track-to-track” ambiguity resolution removes Global Navigation Satellite System (GNSS) satellite hardware delays between adjacent undifferenced (UD) ambiguities, which is often applied in precise orbit determination (POD) for Low E... Read More about Pass-by-Pass Ambiguity Resolution in Single GPS Receiver PPP Using Observations for Two Sequential Days: An Exploratory Study.

Analysis of the performance of closely spaced low-cost multi-GNSS receivers (2021)
Journal Article

© 2021, The Author(s). The recent advances of low-cost GNSS receivers have broadened their application field not only in positioning and navigation, but also in deformation monitoring of civil engineering structures and geohazards. Even though some c... Read More about Analysis of the performance of closely spaced low-cost multi-GNSS receivers.

An observation of non-stationary response to non-synoptic wind on the Forth Road Bridge (2020)
Journal Article

© 2020 Elsevier Ltd The GeoSHM project feasibility study for monitoring the Forth Road Bridge is briefly introduced and the instrumentation summarised. The events of January 9th, 2015 are described, when the bridge was struck by storm Elon, which cau... Read More about An observation of non-stationary response to non-synoptic wind on the Forth Road Bridge.

The use of sar offset tracking for detecting sand dune movement in sudan (2020)
Journal Article

© 2020 by the authors. Licensee MDPI, Basel, Switzerland. Sand movement is one of the main environmental hazards in Northern Sudan that threaten livelihood and rural communities. This paper investigates for the first time the use of the Synthetic Ape... Read More about The use of sar offset tracking for detecting sand dune movement in sudan.

A novel dynamical filter based on multi-epochs least-squares to integrate the carrier phase and pseudorange observation for GNSS measurement (2020)
Journal Article

© 2020 by the authors. The high noise of pseudorange and the ambiguity of carrier phase observation restrain the GNSS (Global Navigation Satellite System) application in military, industrial, and agricultural, to name a few. Thus, it is crucial for G... Read More about A novel dynamical filter based on multi-epochs least-squares to integrate the carrier phase and pseudorange observation for GNSS measurement.

A Multiple Algorithm Approach to the Analysis of GNSS Coordinate Time Series for Detecting Geohazards and Anomalies (2020)
Journal Article

©2020. American Geophysical Union. All Rights Reserved. In this study, a multiple algorithm approach to the analysis of GNSS coordinate time series for detecting geohazards and anomalies is proposed. This multiple algorithm approach includes the nove... Read More about A Multiple Algorithm Approach to the Analysis of GNSS Coordinate Time Series for Detecting Geohazards and Anomalies.

Application of GeoSHM System in Monitoring Extreme Wind Events at the Forth Road Bridge (2019)
Journal Article

© 2019 by the authors. Implementation of Structural Health Monitoring systems on long-span bridges has become mandatory in many countries to ascertain the safety of these structures and the public, taking into account an increase in usage and threats... Read More about Application of GeoSHM System in Monitoring Extreme Wind Events at the Forth Road Bridge.

Multi-sensor measurement of dynamic deflections and structural health monitoring of flexible and stiff bridges (2019)
Journal Article

We investigated the response of bridges of different types to controlled and to wind and traffic-induced excitations; the emphasis was on deflections,derived from recordings of geodetic sensors and accelerometers (output-only analysis). Our focus w... Read More about Multi-sensor measurement of dynamic deflections and structural health monitoring of flexible and stiff bridges.

Galileo Augmenting GPS Single-Frequency Single-Epoch Precise Positioning with Baseline Constrain for Bridge Dynamic Monitoring (2019)
Journal Article

© 2019 by the authors. The Single-frequency Single-epoch double-differenced baseline resolution technique of Global Positioning System (GPS) provides a good opportunity for monitoring the displacement or deflection behavior of bridges under different... Read More about Galileo Augmenting GPS Single-Frequency Single-Epoch Precise Positioning with Baseline Constrain for Bridge Dynamic Monitoring.

Detection of ground motions using high-rate GPS time-series (2018)
Journal Article

Monitoring surface deformation in real-time help at planning and protecting infrastructures and populations, manage sensitive production (i.e. SEVESO-type) and mitigate long-term consequences of modifications implemented. We present RT-SHAKE, an algo... Read More about Detection of ground motions using high-rate GPS time-series.

Design and implementation of a new system for large bridge monitoring—GeoSHM (2018)
Journal Article

Structural Health Monitoring (SHM) is a relatively new branch of civil engineering that focuses on assessing the health status of infrastructure, such as long-span bridges. Using a broad range of in-situ monitoring instruments, the purpose of the SHM... Read More about Design and implementation of a new system for large bridge monitoring—GeoSHM.

Real-time characterization of large earthquakes using the predominant period derived from 1Hz GPS data (2018)
Journal Article

Earthquake early warning (EEW) systems’ performance is driven by the trade-off between the need for a rapid alert and the accuracy of each solution. A challenge for many EEW systems has been the magnitude saturation for large events (Mw>7) and the re... Read More about Real-time characterization of large earthquakes using the predominant period derived from 1Hz GPS data.