Ground deformation
- Measurement Setup of the GPS-GBSAR-System
- Low Cost GPS Antenna
- GBSAR device IBIS-L
The combined GPS - GBSAR System
A selected area of the volcano slope will be observed with a real-time GPS and GBSAR (ground based Synthetic Aperture Radar) deformation monitoring system. The combined system consists of four precise dual-frequency GPS receiver, several low-cost single-frequency receiver and an IBIS-L GBSAR device. The GBSAR delivers areal surface deformation, while the GPS-network gives deformation information at discrete points in a common geodetic reference frame.
The GPS results will be used to georeference the GBSAR picture. In a new approach, carried out at the Institute of Physical Geodesy at TU Darmstadt, the combination of both techniques should yield precise almost real-time 3d-deformation monitoring.
Advantages of combined observations
The combination of both techniques provides several advantages:
- high spatial resolution given by the GBSAR
- high temporal resolution (minutes)
- highest accuracy (up to millimeters along the line of sight (LOS) of the GBSAR
- areal 3d-deformation information by the combination of GPS and GBSAR
- secure operation through remotely sensing of the surface from a safe distance
- continuous and automated operation
- near real-time interpretation