Two people provided answers to my previous questions:
- What is the nominal frequency of the satellite communications terminal on MH370?
- How does one interpret the satellite data on flight MH370?
And they referred me to Appendix G. "Explanatory Notes on BTO and BFO Analysis".
Now I have questions about Appendix G.
The report (Appendix G) says that the Doppler shift from the satellite (down-link) to GES depends on the satellite movement with respect to GES, since the satellite is not exactly stationary. But in Table 6. the Down-link Doppler frequency varies, from the satellite to GES depending on the aircraft Latitude. Why should the Aircraft Latitude affect the DeltaFdown Doppler frequency shift?
And another question is about the Down-link doppler-shifts, from the Satellite to GES, given in Table 5. The listed Doppler-shift in frequency is -75.1 Hz for UTC time 17:07. However, I can only derive this frequency using the satellite velocity for UTC time 16:55:00? The calculated frequency differs slightly from the one in the report.