Reading ERS E2 Raw data fromat (missing documentation)

Hello,

I am trying to understand the format of ERS-1/2 SAR Raw Image Product Level 0. The measurement data segments begin with header, containing “Auxiliary Data and Replica/Calibration Pulses” field. The description of this field references the document ER-IS-ESA-GS-0002 “ERS-2 Satellite to Ground Segment Interface Specification,” but it is nowhere to be found. Where can I find some description of this data fields (or some software that read E2 format with L0 data)?

Thanks