This
article presents the modal frequency recordings of a rigid bridge, monitored by
the GPS receivers (Global Positioning System) with a data recording rate of 100
Hz and accelerometers. The GPS data processing was performed through the double-difference phase,
using the adjusted interferometry technique (i.e. phase residue method—PRM®). In the method, the double-difference phase
of the carrier L1 is realized by using
two satellites only, one was positioned at the zenith of the structure and the
other satellite was positioned near the horizon. The results of the parametric
adjustment of the PRM observations were finalized through software
Interferometry, mathematical algorithm were
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