Thanks for your answer and ... sorry for the stupid first question
About the -2 BFO: if valid, is not the (3D) direction of the descent playing a big role? Or the value given (13000'/min) is the minimum in the most efficient direction?
One more question...:
Is the way the AES compensate from its own speed and direction trully established? And, first, does it compensate always anything? Or only if the BFO value could be too high?
I have read it compensates:
- not using a measured Doppler from a signal from 3F1 (logical, if not, no pro rata BFO)
- relatively to the theoretical position of 3F1,
- only for horizontal speed and direction,
- using the ADIRU.
Are all these statements established or just deduced or guessed?