k0ua
Epic Contributor
so how can they say it went down south ind ocean without positive id yet?![]()
The thinking of the Malaysian government and INMARSAT was that they analyzed the doppler effect of the radio signals relative to the known satellite location and determined the path had to be in southern Indian ocean. As you know if a radio signal is coming toward the receiver the frequency will be noted as being higher and if the signal source (transmitter) is going away from the receiver the apparent signal frequency will be lower. I used to work the Amateur Radio satellites, and the doppler frequency shift is very pronounced. It is pretty thin, but they think that is enough to say which of the two triangulated paths the aircraft took.