Numerical error analysis of CSL georeferencing processing implementation

This paper describes the specific implementation of georeferencing and geoprojection processes within the CSL interferometric SAR processor. It covers both the forward projection (converting azimuth-slant range coordinates from a SAR image to a georeferenced position) and the back projection (converting a georeferenced position back to azimuth-slant range coordinates). To evaluate the numerical accuracy and reliability of these implementations, the authors performed back-and-forth coordinate projections to measure the resulting shifts. The estimation of numerical errors is analyzed in relation to the azimuth-slant range position, Doppler centroid, and point altitude. This research was funded by the Belgian Scientific Policy under the ORFEO program.