Investigation of sea ice and lake ice using Ground-Based SAR tomography

Temesgen Gebrie Yitayew (1) , Laurent Ferro-Famil (2) , Torbjorn Eltoft (1)

1 UiT - University of Tromsø
2 IETR - Institut d'Électronique et des Technologies du numéRique

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

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Temesgen Gebrie Yitayew, Laurent Ferro-Famil, Torbjorn Eltoft. Investigation of sea ice and lake ice using Ground-Based SAR tomography. Geoscience and Remote Sensing Symposium (IGARSS), 2015 IEEE International, 2015, Milan, Italy. pp.5276-5279, ⟨10.1109/IGARSS.2015.7327025⟩. ⟨hal-01279744⟩