Measurements of Sea Surface Currents in the Baltic Sea Region Using Spaceborne Along-Track InSAR
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Using SAR as a source of wind speed reduces the bias and root-mean-squared-error (RMSE) of the retrieved currents by 20% and 15%, respectively, which demonstrates that current retrieval from ATI-SAR can be completed independently of atmospheric models.Abstract:
The main challenging problems in ocean current retrieval from along-track interferometric (ATI)-synthetic aperture radar (SAR) are phase calibration and wave bias removal. In this paper, a method based on differential InSAR (DInSAR) technique for correcting the phase offset and its variation is proposed. The wave bias removal is assessed using two different Doppler models and two different wind sources. In addition to the wind provided by an atmospheric model, the wind speed used for wave correction in this work is extracted from the calibrated SAR backscatter. This demonstrates that current retrieval from ATI-SAR can be completed independently of atmospheric models. The retrieved currents, from four TanDEM-X (TDX) acquisitions over the Oresund channel in the Baltic Sea, are compared to a regional ocean circulation model. It is shown that by applying the proposed phase correction and wave bias removal, a good agreement in spatial variation and current direction is achieved. The residual bias , between the ocean model and the current retrievals, varies between 0.013 and 0.3 m/s depending on the Doppler model and wind source used for wave correction. This paper shows that using SAR as a source of wind speed reduces the bias and root-mean-squared-error ( RMSE ) of the retrieved currents by 20% and 15%, respectively. Finally, the sensitivity of the sea current retrieval to Doppler model and wind errors are discussed.read more
Citations
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Empirical Relationship Between the Doppler Centroid Derived From X-Band Spaceborne InSAR Data and Wind Vectors
TL;DR: It is found that empirical models are more consistent with both backscatter and Doppler data than theory-based models, which motivates a further improvement of SAR dc GMFs.
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The TanDEM-X Mission Phases—Ten Years of Bistatic Acquisition and Formation Planning
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TL;DR: TanDEM-X is a formation flying interferometer consisting of two SAR satellites as mentioned in this paper, which acquired bistatic SAR data of the earth to generate a global digital elevation model as well as individual scientific interferometric datasets on user request.
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A Tower-Based Radar Study of Temporal Coherence of a Boreal Forest at P-, L-, and C-Bands and Linear Cross Polarization
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Empirical Relationship Between the Doppler Centroid Derived From X-Band Spaceborne InSAR Data and Wind Vectors
TL;DR: In this article , an empirical geophysical model function (GMF) is fit to the estimated Doppler centroid and compared to existing models and previous experiments, showing that the GMF is in good agreement (within 0.2 m/s) with other models and data sets.
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References
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