On 3/24/14 10:18 PM, David McGaw wrote:
I am surprised it took them this long.  A number of satellite telemetry
systems can use doppler as a matter of course for locating transmitters,
such as Iridium and Argos.

Those are actually designed for measuring Doppler..
That's really the difference..
This was probably figured out after the fact in an ad hoc way.

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