Now I have a funny vision in my head of a WWII radio tech standing in a field, wearing an absurdly large RADAR rig, with a big sweeping antenna protruding from a backpack and a massive screen on his chest, turning this way and that, all confused by how the sweep doesn't look quite right...
That's not too far off, actually. Airborne radar as recently as the F-14 needed time to "settle down" an extrapolated track after maneuvering, to the point that they could give false indications of targets changing heading. This phantom turn looked aggressive and contributed to the US downing 2 Libyan fighter jets in 1989.
