terrain-avoidance / clearance radar

radar cross-section / radar cross section (RCS); radar signature; radar crossover

safe terrain clearance

terrain clearance

TRML-4D radar (нім. Telefunken Radar Mobil Luftraumüberwachung / Telefunken mobile airspace surveilance radar)

airborne collision avoidance system (ACAS)

contamination avoidance

hazard avoidance

traffic collision avoidance system (TCAS)

collision avoidance system-equipped aircraft

airborne collision avoidance system

avoidance

aircraft collision avoidance system

autonomous collision avoidance system (ACAS)

collision avoidance

collision avoidance drone

collision avoidance system (CAS)

obstacle avoidance

obstacle avoidance drone

obstacle avoidance system (OAS)

obstacle collision avoidance system (OCAS)

nap-of-the-earth (NOE) (ground-hugging / terrain masking / flying under the radar / hedgehopping)

3-D radar; 3D radar

high-power illuminator radar / high power illuminating radar (HIPIR)

radar air-to-surface vessel (ASV radar)

X-radar / X band radar

continuous-wave radar (C.W. radar)

air traffic clearance

clearance decontamination

clearance time

debris clearance

diplomatic clearance

fuselage and landing gear clearance zone