Re: It Could Be Made to Work ???
Like GSM in order for the satellite internet to work all transmissions from various ground stations must arrive in sync. Therefore the ground transceiver must know the exact range to the satellite.
The problem as you correctly point out is that we would not have an exact position for the satellite.
You could potentially model this quite accurately and transmit the ephemeris data out of band.
Also you can have fixed ground stations verifying the exact position of each satellite the same way GPS does but have the clocks on the ground.
It will be clunky and probably never make it into consumer GPS but if what you want is a solution for the military in case we go to war with France then probably it will do the job