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How does a drone 'sense and avoid' non-squawking traffic in IMC?
I imagine it doesn't.... just like no-one else can either.
Just because it is uninhabited, may not mean that someone is not in control.
Unfortunately most people classify ALL UAS (Drones = sooooo 1960s) in the same 'basket' of aviation, like comparing a 777 to a Piper Cub in a lot of respects. Some have high end specs to work in the manned airspace, others don't....I believe there is work to clarify UAS into categories - which (unfortunately for the UAS community) currently only classify altitude, weight and endurance. What should be done is compare on-board and external systems and overall airworthiness, redundancies etc, to ascertain what and where they can be used. Just because it is a 'Drone' does not necessarily mean it is autonomous.