Yes, there are perturbations and imperfections that are corrected for in the calculations. I considered this as TMI in replying to a person who was unsure about the types of satellites and their orbits.
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)
That's the point. I think the Inmarsat spokesman, who is a PR guy and probably not a satellite enginer, misspoke.
We have an aircraft moving at say 500 miles an hour across the surface of the earth.
We have a satellite that is basically stationary with respect to the surface of the earth.
It is not the movement of the satellite with respect to the earth, which is what the spokesman suggested, that is causing the bulk of the Doppler effect.