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Tangent-linear models in GNSS radio-occultation ray-tracing



  • Location: Exeter
  • Weather Preferences: Warm and sunny!
  • Location: Exeter

    Hi all,

    I'm sorry for the very specific question, I've been researching how actually generate a linear tangent model from a ray-tracing algorithm.  The papers I've read so far haven't been particularly clear how this is done.  The formulation of using a tangent model and gradient descent methods is described here: https://www.ecmwf.int/sites/default/files/elibrary/2018/18542-tangent-linear-and-adjoint-models-data-assimilation.pdf

    If anyone is in the field of GNSS radio-occultation or other propagation-based methods I'd greatly appreciate any guidance!

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