As I understand it, Doppler will give you the magnitude of the velocity vector for an aircraft with respect to the satellite, but it won't give you the actual direction of the aircraft.
Why does the stability of the oscillators matter if you can't determine the direction? Is there another satellite involved? Can you learn something if you assume a velocity for the aircraft? In which case the error in the assumed velocity would swamp the oscillator error, no? Bill Hawkins -----Original Message----- From: Joe Leikhim Sent: Monday, August 18, 2014 11:53 AM Is anyone paying attention to all the chatter about the lost aircraft MH370, Inmarsat's supposed flight tracks based on 6 or 7 pings (1 per hour), the Doppler shift (BFO) and transaction timing (BTO) etc?? Basically from my perspective they are putting too much stock into the Doppler which relies in part upon the stability of the satellite terminal in the 777 aircraft. My question is how stable an oscillator (reported OCXO - not confirmed) would be under the extremes of either or both a cabin fire or decompression event. There is a website (Duncan Steel Blog) where some math brains are trying to sort out the raw data provided by Inmarsat. They have made assumptions about the stability of the local oscillator in the satellite, but I think the aircraft satellite terminal's master oscillator is a variable they have pushed aside. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
