GNGTS 2019 - Atti del 38° Convegno Nazionale

234 GNGTS 2019 S essione 1.4 - a TDK InvenSense ICM-20689 IMU (3-axis accelerometer + 3-axis gyroscope); - a ZC ZCT215M inclinometer (2-axis digital tilt sensor). The TDK IMU is embedded directly on the Saphyrion board. The ZC inclinometer is external and will be attached to the same vertical pole holding the GNSS antenna, in order to detect rotations of the pole, and decouple them from the movements detected by GNSS. First GIMS pilot study. The first GIMS pilot installation was performed on 17, 18 and 19. June 2019. Seven GNSS antennas, seven inclinometers, seven accelerometers, seven gyroscopes and two compact active SAR transponders were installed to the pilot area 1 (Vipava valley, Slovenia). The installation has been partially recorded for the promo movie (see https:// www.gims-project.eu/ ). According to the requirements specified by the technical team from the Geological Survey of Slovenia (GeoZS), the GIMS units were installed at four locations along the Motorway H4 Razdrto-Vipava (Fig. 1) in the Vipava valley. At those locations, a total of seven GIMS units were installed (Fig. 2). Field trial testing was started on 18th June 2019 right after the deployment of the units. The first GNSS results are promising, with baseline repeatability of 1 mm (std) in the East and North direction and of 3.5 mm (std) in the Up direction for hourly solutions. A proper processing of the inertial system and of the SAR observations, as well as the integration between the different systems is still under development; however, also in this case first results seem to be promising. In Fig. 3 first raw observations from the SAR and inertial systems are reported. Fig. 1: Position of the station locations in the first pilot area Vipava valley.