xsarslc is a python package that allow to compute SAR cross spectrum and advanced radar parameters from Sentinel-1 SLC products. It handles 3 modes of acquisitions IW , EW and WV. The source code is relying on xarray library. https://github.com/umr-lops/xsar_slc documentation is available here: https://cerweb.ifremer.fr/datarmor/sarwave/documentation/processor/sar/xsarslc/html/ It contains an Algorithm Tehcnical Baseline Document (ATBD) section, describing the equations of each processing steps and their rationales.