Refractivity data fusion

A hybrid method for fusing refractivity information derived from electromagnetic sensors with background fields from a numerical weather prediction (NWP) model is described. Refractivity defined in Cartesian coordinates is mapped into a space of “diagnostic” parameters that coincide with those that have been used in inversion algorithms such as refractivity-from-clutter. These correspond to parameter surfaces over the domain of the NWP model. A 2DVAR is performed in the diagnostic space.