Alaska Satellite Facility (ASF) create ASF MapReady Software to prepare some radar satelite image well.
ASF Map Viewer
The MapReady Remote Sensing Tool Kit accepts level 1 detected SAR data, single look complex SAR data, and optical data from ASF and some other facilities. It can terrain correct, geocode, apply polarimetric decompositions to multi-pol SAR data, and save to several common imagery formats including GeoTIFF. Other software included in the package are an image viewer, metadata viewer, a projection coordinate converter, and a variety of command line tools.
I've created some paragraph about the process or step to prepare ALOS PALSAR mosaic data from JAXA. my paper can be downloaded here (although in image metadata is showed a cordinate system, better we have to do georeferencing first before processing this data)
thanks and regard :)