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