That takes longer than the more sophisticated radar separation
used in Singapore and elsewhere in the world, which allows a controller to more quickly take stock of radar returns from all aircraft in the area.
The Juneau WAM system uses multilateration to provide controllers at the Anchorage Air Route Traffic Control Center with high accuracy, high availability surveillance of aircraft and helicopters, enabling ATC-provided radar separation
and traffic advisory services to pilots operating in the Juneau airspace.
When I say "change to advisory frequency", that's the same as saying, "radar service terminated." We just leapt from radar separation
to IFR non-radar separation standards.
rules still apply: three miles horizontally, 1000 feet vertically, or at least 15 degrees of divergence.
The Controller's Handbook 9-3-2b requires controllers to provide radar separation
of three miles (six miles above FL 600) from special use airspace.
between IFR airplanes requires 1000 feet vertical separation or three miles laterally for radar approach controls.
If you're climbing high, ATC needs to ensure vertical or horizontal radar separation
between you and other traffic before you reach flight level 180.--TK
Radar controllers don't have that luxury for nontowered fields and need that radar separation
Minimum required radar separation
from the MOA boundary is three miles.
When a major airport's weather drops below VFR minimums, its traffic capacity drops considerably because they must now use radar separation