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A Variational Adjoint Approach on Wide-Angle Parabolic Equation for Refractivity Inversion

Karabaş, Uygar and Diouane, Youssef and Douvenot, Remi A Variational Adjoint Approach on Wide-Angle Parabolic Equation for Refractivity Inversion. (2021) IEEE Transactions on Antennas and Propagation. ISSN 0018-926X

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Official URL: https://doi.org/10.1109/TAP.2021.3060073


Radar systems performance under anomalous propagation conditions can be predicted if the atmosphere is properly known. This paper introduces a tomographic approach to estimate refractivity in the troposphere with an adjoint-based inversion method. A new adjoint model is developed for the two-dimensional wide-angle parabolic equation using variational adjoint approach, to invert refractivity from phaseless data measured with an array of radio receivers in open-sea environment. The obtained adjoint model is validated considering propagation through range-independent medium over flat perfectly-electric-conducting surface at horizontal polarization. The ill-posedness of the regarded inverse problem is shown with the optimization landscapes. The parametric study indicates the potential use of this method as a refractivity gradient retrieval system under certain circumstances.

Item Type:Article
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Ecole Nationale de l'Aviation Civile - ENAC (FRANCE)
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
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Deposited On:25 Feb 2021 10:59

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