GNSS Landing System (GLS)?
Does anyone know where I might find detailed information about the workings of the GNSS Landing System (GLS) on the internet.?
I understand the concept of the Ground Based Augmentation System (GBAS) refining the aircrafts GPS position with error corrections, but I surmise this same system is somehow involved in the vertical navigation too.
The part that is not clear to me how the approach path is defined and how the aircraft determines it's vertical position in relation to that path. Does the aircraft utilise GPS altitude? Is this altitude only available with the assistance of the GBAS?
The fact that the GLS can facilitate autoland means the descent path and altitude is flown independent of the aircraft's FMC's and pressure Altimiters but nowhere can I find this stated as fact.
Thank you.