InSAR

The technology called InSar (Interferometric SAR) is a new measuring technology enabling monitoring and analyzing deformations of important or high-risk construction objects or natural formations like bearing walls, cliffs and massifs, banks in danger of land slide, erosion areas, and the like. These high-risk objects and localities can be affected by natural hazards (e. g. floods, storms, erosion, seismic activity) or careless activity of people (e. g. accident, mining activity) and cause considerable threat to health or lives of people.

Advantages

InSAR technology can be used in long-term observing/monitoring quarry walls, landslide slopes or bearing/braced walls. With respect to measuring done before can be claimed that this measuring can be used in any climatic conditions.

Disadvantages

Banks covered with vegetation are not suitable for observing or monitoring via radar interferometry with synthetic aperture (InSAR) and it is necessary to find such a place for the radar enabling lucid measuring of the whole locality that is to be measured.
IBIS-L:
A stable coherent interferometric radar e. g. IBIS-L type is used for the measuring. IBIS-L works on a microwave length of middle frequency of 17.1 – 17.3 GHz. The measuring scope of the IBIS radar can be adjusted up to the maximal value of 4 km. Standard deviation of the movements measured by the radar is according to the data from the manufacturer up to 0.1 mm under ideal conditions. Differentiation ability of particular subject matters in radial direction, i. e. in the direction of the observation, is 0.75 m (the width of the radial gravity field). The accuracy of the measured movement or their standard deviation depends on several factors: the distance of the point on the construction from the radar, the elevation gains between the point on the bridge and the radar, the reflector used (natural/artificial trigonal reflector), atmospheric conditions and construction type.

References

  • Monitoring of a bearing wall horizontal deformations in Dolní Lhota
  • Monitoring of Štramberk limestone quarry wall horizontal deformations
  • Monitoring of Vír water work dam horizontal deformations
  • D8, D1 highways – using the new InSAR technology for monitoring and forecast of landslides and banks
  • Monitoring of a dropped ceiling in Dobrovského Tunnel at the town of Brno town circuit
  • Monitoring of Orlík dam horizontal deformations