What happens when drone loses GPS --during RTH-- ?

[Jeanb]

Assuming RTH has been initiated at a point the drone had enough GPS satellites/Signal, later on --during RTH-- the drone loses GPS, what will happen?
Assuming the drone gains back GPS signal after losing it during RTH, will RTH resume automatically?

 

[sar104]

If the RTH was initiated either manually or automatically with the aircraft still connected to the controller, then loss of GNSS positioning will simply cause it to switch to ATTI mode. Recovery of GNSS positioning with connection to the controller should switch it to P-GPS mode rather than RTH.

If the aircraft is not connected to the controller or subsequently loses connection then ATTI mode triggers immediate autoland. Recovery of positioning with no controller connection should put it back into RTH if it has not already landed.

 

[Meta4]

Assuming RTH has been initiated at a point the drone had enough GPS satellites/Signal, later on --during RTH-- the drone loses GPS, what will happen?

Your drone cannot continue to RTH without GPS.
If you lose GPS (and you shouldn't if you are flying out in the open), the drone will hover waiting for your control input.
Without GPS, it cannot hold position and would drift an any wind.

Assuming the drone gains back GPS signal after losing it during RTH, will RTH resume automatically?

I can't think of a case where this has happened.
But losing GPS will cancel the RTH and regaining GPS will not restart the RTH.