Some older SAR satellites (e.g., RADATSAT-1) have low-quality orbital data, which hinders the compensation of topographic phases and vertical wavenumber computation (see S1TBX-SE-24 Vertical wavenumber computation). This leads to a poor estimation of height (which leads to poor geocoding) and line-of-sight deformation. This enhancement will improve baseline estimation based on interferometric data. The main approach[R10] is to find the (parallel and perpendicular) baseline components that minimize the difference between the interferometric phase and the interferogram modeled using a DEM or heights of ground control points (GCPs).Limitations and recommendations:1. If line-of-sight ground deformation manifests itself as legitimate azimuth/range ramps, this effect will leak into the orbit correction.2. It is assumed that orbit data is first estimated using polynomial regression (or spline interpolation).

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