I think it is like GPS, the signal from the plane has encoded in it the time it was sent and the satellite knows when it arrived at the sat. Using a formula to compensate for our atmosphere and using the speed of light it knows the distance travelled.
Rick
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On Mar 16, 2014, at 4:49 PM, "Anthony Japha" tjjapha@earthlink.net wrote:
Thanks Rick, How do those sats determine distance to the source? Tony, N2UN
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