Inmarsats are comms satellites with focused spot beams. Wouldn;t that have to have been communicating with the plane to detect Doppler shift? If they had an orbital autotrack function that uses Doppler shift for orbital correction, the signal would be focused on a beacon with a known lat, long, and altitude. I thought satellites used star patterns in concert with ground beacons for navigation control.
No way an Inmarsat bird could “track” an object without common communications between the two objects IMO! Am I missing something here?
I think you need to talk to the engineers at Inmarsat and the AAIB (UK Air Accidents Investigation Branch) ...
http://www.aaib.gov.uk/home/index.cfm