The monitoring of static and dynamic deformations of buildings and other engineering structures is of great
interest for many scientific and practical reasons. Such measurements provide information required for safe maintenance
of the constructions being a subject of various excitations. At present one of the most commonly used technology
for this purpose is the high-rate GNSS positioning. The application of GNSS technology with appropriate processing
methodology may meet the specific requirements which result in extraction of information on dynamic displacements
and deformations of ground and engineering structures. The high temporal resolution and precision of
GNSS phase observations predestine this technology to be applied to the most demanding applications in terms of accuracy,
availability and reliability. In this study we present preliminary results of application of precise GNSS positioning
for detection of small scale (centimeter level) dynamic displacements. In the first part of work there are described
methodology and algorithms of precise coordinate estimation, involving both the relative positioning as well
as the Precise Point Positioning technique. In the experiment both approaches were applied to monitor of antenna
point variations on the basis of high-rate (20 Hz) observations processed in self-developed software. The dynamic displacements
were simulated using specially constructed device moving GNSS antenna with dedicated amplitude and
frequency. The obtained results indicate on possibility of detection of dynamic GNSS antenna displacements even at
the level of millimetres using relative positioning. Moreover, the Precise Point Positioning approach has also proved
its applicability to detect high-rate small scale changes of the controlled site coordinates.
Real-time high-rate co-seismic displacement from ambiguity-fixed precise point positioning: Application to earthquake early warning
