Integrated GPS and Pseudolite positioning for deformation monitoring

Yang, Guang; He, Xiufeng; Chen, Yongqi

doi:10.1179/003962610x12572516251402

Cited by 7 publications

(8 citation statements)

References 3 publications

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“…A deeper investigation devoted to the comparison of data from different devices only once they were in the same reference system is presented by Barzaghi [ 61 ]. Yang [ 64 ] proposed an interesting application of a pseudolite-augmented GNSS technique that could help overcome some limitations of GNSS-only surveys in unfavorable environments.…”

Section: Geodetic and Gnss Sensors For Precise Measurement At Specmentioning

confidence: 99%

Geodetic and Remote-Sensing Sensors for Dam Deformation Monitoring

Scaioni

Marsella

Crosetto

et al. 2018

Sensors

126

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In recent years, the measurement of dam displacements has benefited from a great improvement of existing technology, which has allowed a higher degree of automation. This has led to data collection with an improved temporal and spatial resolution. Robotic total stations and GNSS (Global Navigation Satellite System) techniques, often in an integrated manner, may provide efficient solutions for measuring 3D displacements on precise locations on the outer surfaces of dams. On the other hand, remote-sensing techniques, such as terrestrial laser scanning, ground-based SAR (synthetic aperture radar) and satellite differential interferometric SAR offer the chance to extend the observed region to a large portion of a structure and its surrounding areas, integrating the information that is usually provided in a limited number of in-situ control points. The design and implementation of integrated monitoring systems have been revealed as a strategic solution to analyze different situations in a spatial and temporal context. Research devoted to the optimization of data processing tools has evolved with the aim of improving the accuracy and reliability of the measured deformations. The analysis of the observed data for the interpretation and prediction of dam deformations under external loads has been largely investigated on the basis of purely statistical or deterministic methods. The latter may integrate observation from geodetic, remote-sensing and geotechnical/structural sensors with mechanical models of the dam structure. In this paper, a review of the available technologies for dam deformation monitoring is provided, including those sensors that are already applied in routinary operations and some experimental solutions. The aim was to support people who are working in this field to have a complete view of existing solutions, as well as to understand future directions and trends.

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Section: Geodetic and Gnss Sensors For Precise Measurement At Specmentioning

confidence: 99%

Geodetic and Remote-Sensing Sensors for Dam Deformation Monitoring

Scaioni

Marsella

Crosetto

et al. 2018

Sensors

126

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show abstract

“…On its own, any ground based positioning system struggles, with vertical component determination, due to environmental restrictions. Research into pseudolites (Meng et al 2003, Yang et al 2010 suggests that integration with GNSS elevates this and improves 3D accuracy considerably. Additionally, the static nature of Locatalites strengthens the solution, by providing predictable observations.…”

Section: Integrated Geometrymentioning

confidence: 99%

“…Generally, phase multipath e¤ects tend to be smaller than 1 4 of a phase (Yang et al 2010), causing a bias up to 3 cm for Locata. The Locata system introduces a number of noise mitigating techniques, such as dual frequency and spatially separated antennas (for the single transmitter) (Barnes et al 2006).…”

Section: Problem Descriptionmentioning

confidence: 99%

“…A default threshold of 1 3 of the phase indicates that multipath remains undetected. One of previously suggested correction methods is to treat multipath as a systematic error (Yang et al 2010) and remove it accordingly. Authors are assessing how external factors, such as lowering the transmission level and introducing dedicated antenna shielding can improve indoor performance.…”

Section: Problem Descriptionmentioning

confidence: 99%

“…Interference in general lowers signal strength. Multipath, a non-direct signal, reduces power and shifts phase (Leick 2004, Yang et al 2010). In extreme cases, when the signal arrives at a very low (less than 10 ) or negative elevation angle (surface glance), it can cause complete signal loss.…”

Section: Problem Descriptionmentioning

confidence: 99%

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Bonenberg

Hancock

Roberts

2010

Journal of Applied Geodesy

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Abstract. GNSS has become one of the most widespread measurement technologies, allowing cm-level positioning accuracy using RTK or Network RTK. Unfortunately, the system's major drawbacks are the requirement for a clear view of the sky and accuracy dependent on the geometric distribution of the satellites, not only varying throughout the day but also prone to location specific problems. With widespread utilisation of GNSS for monitoring of manmade structures and other civil engineering tasks, such shortcomings can be critical. One of possible solution is the deployment of a supporting system, such as Locata -a terrestrial positioning technology, which mitigates the need for a clear view of the sky and provides system integrity control. This paper, part of the proposed integration feasibility study, presents Locata performance indoors, its capacity and mitigation methods.

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Integrated GPS and Pseudolite positioning for deformation monitoring

Cited by 7 publications

References 3 publications

Geodetic and Remote-Sensing Sensors for Dam Deformation Monitoring

Geodetic and Remote-Sensing Sensors for Dam Deformation Monitoring

Indoor multipath effect study on the Locata system

Methodology for Creating a Digital Map of Al-Diwaniyah City (Iraq)

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