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Parameter estimation for peaky altimetric waveforms

Halimi, Abderrahim and Mailhes, Corinne and Tourneret, Jean-Yves and Thibault, Pierre and Boy, François Parameter estimation for peaky altimetric waveforms. (2013) IEEE Transactions on Geoscience and Remote Sensing, 51 (3). 1568-1577. ISSN 0196-2892

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Official URL: http://dx.doi.org/10.1109/TGRS.2012.2205697


Much attention has been recently devoted to the analysis of coastal altimetric waveforms. When approaching the coast, altimetric waveforms are sometimes corrupted by peaks caused by high reflective areas inside the illuminated land surfaces or by the modification of the sea state close to the shoreline. This paper introduces a new parametric model for these peaky altimetric waveforms. This model assumes that the received altimetric waveform is the sum of a Brown echo and an asymmetric Gaussian peak. The asymmetric Gaussian peak is parameterized by a location, an amplitude, a width, and an asymmetry coefficient. A maximum-likelihood estimator is studied to estimate the Brown plus peak model parameters. The Cramér–Rao lower bounds of the model parameters are then derived providing minimum variances for any unbiased estimator, i.e., a reference in terms of estimation error. The performance of the proposed model and the resulting estimation strategy are evaluated via many simulations conducted on synthetic and real data. Results obtained in this paper show that the proposed model can be used to retrack efficiently standard oceanic Brown echoes as well as coastal echoes corrupted by symmetric or asymmetric Gaussian peaks. Thus, the Brown with Gaussian peak model is useful for analyzing altimetric easurements closer to the coast.

Item Type:Article
Additional Information:Thanks to IEEE editors. The original publication is vailable at http://ieeexplore.ieee.org
HAL Id:hal-00800065
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National d'Études Spatiales - CNES (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Collecte Localisation Satellites - CLS (FRANCE)
Laboratory name:
Deposited On:04 Mar 2013 14:11

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