Allegedly the Inmarsat 3F1 satellite which is geostationary over the Indian Ocean pinged the aircraft hourly 7 times before air craft finally disappeared.
Image is taken from Wikipedia, see article on Malaysia Airlines Flight 370.
The circle partly marked in red is based on 7th ping and identifies radius from satellite to aircraft.
It should be possible to reconstruct the flight path of the aircraft provided data from the 6 previous pings also is available.
One can start plotting from the last known position identified by radar. Then draw radius/ circle for 1st ping. Assuming aircraft travels at a set speed in a straight line one can then calculate distance travelled from last radar fix to 1st ping circle. There will be two possible positions on the 1st ping circle. This process is then repeated for 2nd, 3rd ... and finally 7th ping. One will end up with 128 flight paths but most can be ignored since air crafts do mainly travel in straight lines and not in zig zag.