Originally Posted by
AndRand
There is more confusion about that: Doppler effect is compensated. Only Inmarsat knows in fact how, so any hypothesis based on these data is speculated.
The AAIB presentation (annex 1) gives some idea about what is compensated / measured or not I think ?
http://www.mot.gov.my/en/Newsroom/Pr...%28AAIB%29.pdf
It seems that the D2 doppler is the plane to satellite doppler contribution.
But you are right, either there is a problem with this D2 definition or measurement, or I have to go back to my trigonometry course (but that the plane can be either closing to the satellite or going away from it depending on the portion of its trajectory seems obvious).
Thanks for the tech. spec. for the max Hz/s tracking (I can introduce it in my little sim).