Investigation of sea ice and lake ice using Ground-Based SAR tomography
Résumé
In this paper we present experimental results relative to the vertical structure of snow covered lake ice and sea ice, sensed with X-band radar system operated in a tomographic configuration. The available data are from a Ground-Based SAR campaign carried out over Prestvannet frozen lake and Kattfjord, both in Tromso, Norway. Direct imaging of the vertical structures of the snow and ice layers is achieved by focusing the signal from a 2D synthetic array in the 3D space. By making use of a priori information about the depth of snow and ice, the refractive index of snow and sea ice/lake ice is estimated from a single polarization tomographic measurement, and the results are in good agreement with previous experimental results. We have also shown that air bubbles in low salinity ice are the main contributors for the backscatter signal from ice.
Mots clés
bubbles
synthetic aperture radar
2D synthetic array
Kattfjord
Norway
Prestvannet frozen lake
Tromso
X-band radar system
air bubbles
direct imaging
ground-based SAR campaign
ground-based SAR tomography
ice layers
lake ice
salinity ice
single polarization tomographic measurement
tomographic configuration
Backscatter
Lakes
Nonhomogeneous media
Refractive index
Sea ice
Snow