The monitoring of static and dynamic deformations of buildings and other engineering structures is of greatinterest for many scientific and practical reasons. Such measurements provide information required for safe maintenanceof the constructions being a subject of various excitations. At present one of the most commonly used technologyfor this purpose is the high-rate GNSS positioning. The application of GNSS technology with appropriate processingmethodology may meet the specific requirements which result in extraction of information on dynamic displacementsand deformations of ground and engineering structures. The high temporal resolution and precision ofGNSS 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 positioningfor detection of small scale (centimeter level) dynamic displacements. In the first part of work there are describedmethodology and algorithms of precise coordinate estimation, involving both the relative positioning as wellas the Precise Point Positioning technique. In the experiment both approaches were applied to monitor of antennapoint variations on the basis of high-rate (20 Hz) observations processed in self-developed software. The dynamic displacementswere simulated using specially constructed device moving GNSS antenna with dedicated amplitude andfrequency. The obtained results indicate on possibility of detection of dynamic GNSS antenna displacements even atthe level of millimetres using relative positioning. Moreover, the Precise Point Positioning approach has also provedits applicability to detect high-rate small scale changes of the controlled site coordinates.

DOI: https://doi.org/10.3846/enviro.2017.224