Pingology...
I have made attempted to account for all motion between the aircraft and the satellite..
The Inmarsat 3F1 was moving very slowly westward during the whole flight , this was not enough to significantly change the 'doppler' shift of the signals routed through it....IMHO...
It was also moving northward away from the equator very slowly , reaching a limit at around 18:41UTC , and then moving back toward the equator again . It is this 'wobble' which Inmarsat suggests could help distinguish between an aircraft route in the northern hemisphere , and one in the southern............via subtle differences....
By far the greatest motion is the up and down direction...........although the figures published are relative to the surface straight down and Kuala Lumpur is part of the way around the world , and so lower values would be experienced there .
In the chart the first section is defined with negative values as the satellite is ascending . The latter part as positive values as the satellite is descending . I converted the speeds to feet per minute , as this helps relate it to aircraft motion............
Last edited by Robin Clark; 5th May 2014 at 20:35.
Reason: problems with image.......