Hvussu stutt- og langtíðar 4D GNSS tíðarrøðir kunnu avdúka deformatiónir av heingibrúgvum

Description

Gethin W. Roberts, dátuserfrøðingur á Umhvørvisstovuni:
The talk will show how the GNSS systems have evolved over the years, allowing civilian users to obtain
better quality measurements, improved availability and interoperability between numerous GNSS.
The talk will also discuss the use of GNSS to measure the movements of long bridges. Such structures
can be 1 or 2km in length and are designed to be flexible and move backwards and forwards. Gethin
first attached a GPS antenna to the Humber Bridge in the UK in 1995. Since then, he has carried out
work on 7 long span bridges. Today, GNSS technologies are used as standard on large bridges in Asia as
part of their structural health monitoring.
The talk will focus on how GNSS technologies can be used to monitor both the magnitude of the movements
in 3D, as well as the frequencies of such movements. Through measuring GNSS data at rates of 20Hz or
more, higher frequencies are obtained, using On The Fly ambiguity resolution to result in millimetre
level precisions, and usually in real time. Such movements are caused by several influences on the
structures, such as traffic loading, wind loading, temperature variations, as well as damage and corrosion.

Period	24 Nov 2022
Event type	Seminar
Location	Tórshavn, Faroe IslandsShow on map
Degree of Recognition	National