Abstract:
Monitoring engineering structures is a vital task as far as safety aspects are
concerned. Nowadays, the Real Time Kinematic (RTK) Global Navigation Satellite
Systems (GNSS) are capable of providing fast and accurate measurements of bridge
and various other important structures. Also the movement and damage severity
can be identified using the dynamic bridge characteristics obtained from this
monitoring GNSS. The aim of this work was to compare the use of RTK GNSS, DGNSS
and Dual Antenna Moving Base GNSS (Hemisphere VS330) in real time motion
monitoring. A wooden platform was developed to mount all types of GNSS antennas
to record the movements at the same time. Hypack hydrographic software was used
in collecting simultaneous data from these three different sensors and the
movements were compared in all 3 dimensions. The performance of the DGNSS,
RTK and the VS330 in x and y directions were almost identical. The average
difference was at a decimeter scale between DGNSS and VS330 while it was just at
a centimeter scale between RTK and VS330. However, the height or vertical
dimension comparison was not that successful.