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This story from Telegraph is scanty in details. But it also mentions Doppler effect. http://www.telegraph.co.uk/technology/news/10719304/How-British-satellite-c

• nly 13y ago
  > These pings from the satellite – along with assumptions about the plane’s speed – helped Australia and the US National Transportation Safety Board to narrow down the search area to just 3 per cent of the southern corridor on 18 March So it looks like the announcement today is actually old news. In any case, it's not entirely clear to me how the Doppler effect would distinguish between northerly and southerly passage.
  • DrJokepu 13y ago
    Maybe it could be used to establish whether the airplane is getting closer to or getting further away from a satellite? Maybe even the relative speed?