Didier wrote:Ya I have absolutely no clue how satellite data is gathered or why there are two giant arcs across Asia where the plane could be... how easy would it be for the satellite to have actually picked up something else that wasn`t the plane for instance.
The satellite it was talking to sits over the equator above the Indian Ocean. The data gives an inclination from the satellite (an angle which tells an object directly underneath the satellite apart from one thousands of miles away), but it doesn't give an azimuth (an angle which tells an object, say, north of the satellite from one west of it). This means you get a big circle around the satellite's location that the signal could have come from. So, take the inclination from each ping received by the satellite, factor in the last known position of the plane, its fuel capacity, and its cruising speed, and you get those two arcs in which it could have ended up.
It isn't clear how much authentication is involved with this signal - whether you could have faked it if you had access to, say, hundreds of thousands of dollars of satellite transceiver equipment, some technical know-, and another plane to move the transmitter around. Even if you could, though, that's a heck of a lot of resources to invest to no obvious gain.
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