Gysbrecht: sorry, we don't speak about the same value. My remark was about "pure" Doppler between a/c and sat. I had not read you with enough attention...
Ole-Ole: how do you find a "D2Satellite" Doppler (Doppler between sat and a fixed point where the a/c is in my understanding) of 43Hz at 22:41 between sat and a fixed point 15S 98E?
In my simple model, I have a 3.96 m/s LoS speed for these data. Which give (to me!) -21.7Hz (for 1643MHz).