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

Abstract : 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.
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Submitted on : Tuesday, March 2, 2021 - 1:34:18 PM
Last modification on : Tuesday, October 19, 2021 - 11:02:55 AM
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Uygar Karabaş, Youssef Diouane, Rémi Douvenot. A Variational Adjoint Approach on Wide-Angle Parabolic Equation for Refractivity Inversion. IEEE Transactions on Antennas and Propagation, Institute of Electrical and Electronics Engineers, 2021, 69 (8), pp.4861-4870. ⟨10.1109/TAP.2021.3060073⟩. ⟨hal-03156207⟩



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