Emulating sentinel-1 Doppler radial ice drift measurements using envisat ASAR data

• Published in: IEEE Transactions on Geoscience and Remote Sensing
• Main Authors: Kræmer, Thomas, Johnsen, Harald, Brekke, Camilla
• Format: Article in Journal/Newspaper
• Language: English
• Published: Institute of Electrical and Electronics Engineers (IEEE) 2015
• Subjects: VDP::Matematikk og Naturvitenskap: 400::Fysikk: 430; VDP::Mathematics and natural science: 400::Physics: 430; Doppler measurements; motion estimation; synthetic aperture radar (SAR); sea ice; Sentinel-1; Asar; Arctic; Fram Strait; Sea ice
• Online Access: https://hdl.handle.net/10037/13351; https://doi.org/10.1109/TGRS.2015.2439044

Accepted manuscript version. Published version available at https://doi.org/10.1109/TGRS.2015.2439044 . © © 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Using data from the Envisat Advanced Synthetic Aperture Radar (ASAR) instrument, this paper demonstrates how the high-precision radial surface velocity product, which will become available with the European Space Agency's Sentinel-1 satellite, can complement the analysis of sea ice motion. High-resolution Doppler frequency measurements are used to estimate the subsecond line-of-sight motion of drifting sea ice in Fram Strait. We compare the method with buoy measurements and a recent cross-correlation algorithm for tracking ice between pairs of images. Maximum speeds measured from the time series were on the order of 20 cm/s. Using our method, we measured instantaneous speeds reaching 40-60 cm/s.