A simple and exact solution for the interferometric and stereo SAR geolocation problem

This paper provides a closed-form solution to the geolocation problem arising in the generation of digital elevation models (DEMs) via both stereo and interferometric synthetic aperture radar techniques. The proposed solution is found with no approximations in an arbitrary Cartesian reference system, thus efficiently allowing the generation of DEMs in a chosen cartographic projection. Moreover, it is amenable of an easy and precise sensitivity analysis that exploits the full three-dimensional nature of the problem, thus being particularly useful when high-squinted and/or crossed-track acquisitions are considered.