Originally Posted By: JerryFountain
I think you will find they did not use doppler, but time delay from the outgoing signal to the incoming signal.

I was under the impression that measuring the time delay of the signal was how the Inmarsat folks initially tried to locate the plane's position, which resulted in widely diverging flight paths, but that the "novel" method they used to later to focus the search towards the south was some sort of doppler analysis that gave them a direction vector.