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Including antenna mispointing in a semi-analytical model for delay/Doppler altimetry

Halimi, Abderrahim and Mailhes, Corinne and Tourneret, Jean-Yves and Boy, François and Moreau, Thomas Including antenna mispointing in a semi-analytical model for delay/Doppler altimetry. (2015) IEEE Transactions on Geoscience and Remote Sensing, vol. 53 (n° 2). pp. 598-608. ISSN 0196-2892

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Official URL: http://dx.doi.org/10.1109/TGRS.2014.2326177

Abstract

Delay/Doppler altimetry aims at reducing the measurement noise and increasing the along-track resolution in comparison with conventional pulse limited altimetry. In a previous paper, we have proposed a semi-analytical model for delay/Doppler altimetry which considers some simplifications as the absence of mispointing antenna. This paper first proposes a new semi-analytical model for delay/Doppler altimetry. The proposed analytical expression for the flat surface impulse response considers antenna mispointing angles, a circular antenna pattern, no vertical speed effect and a uniform scattering. The two dimensional delay/Doppler map is obtained by a numerical computation of the convolution between the proposed analytical function, the probability density function of the heights of the specular scatterers and the time/frequency point target response of the radar. The approximations used to obtain the semi-analytical model are analyzed and the associated errors are quantified by analytical bounds for these errors. The second contribution of this paper concerns the estimation of the parameters associated with the multi-look semi-analytical model. Two estimation strategies based on the least squares procedure are proposed. The proposed model and algorithms are validated on both synthetic and real waveforms. The obtained results are very promising and show the accuracy of this generalized model with respect to the previous model assuming zero antenna mispointing.

Item Type:Article
Additional Information:Thanks to IEEE editor. The original PDF of the article can be found at IEEE Transactions on Geoscience and Remote Sensing website : http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=36
HAL Id:hal-01096695
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National des Etudes Spatiales - CNES (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Ecole Nationale de l'Aviation Civile - ENAC (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Other partners > Rockwell Collins (FRANCE)
Other partners > Thales (FRANCE)
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS (FRANCE)
Université de Toulouse > Université Toulouse - Jean Jaurès - UT2J (FRANCE)
Université de Toulouse > Université de Toulouse I-Sciences Sociales - UT1 (FRANCE)
Other partners > Collecte Localisation Satellites - CLS (FRANCE)
Other partners > Direction Générale de l’Aviation Civile - DGAC (FRANCE)
Other partners > Telecom Bretagne (FRANCE)
Laboratory name:
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Deposited By: Jean-yves TOURNERET
Deposited On:21 Oct 2014 08:48

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