Please excuse my belated comments - I’m still slowly working my way through this 11-volume boxset topic after getting involved in the Cumbria LoRa APRS project only a few weeks ago …
Continuing the discussion from LoRa APRS Tracker (Part 6):
In case, this wasn’t confirmed in the next 5 volumes …
[Wikipedia: Chirp spread spectrum] Additionally, chirp spread spectrum is resistant to the Doppler Effect, which is typical in mobile radio applications
Quote: CSS has been considered as possible candidate for low-power LEO satellite communications due to its resistance to Doppler effect.