At its busiest, each sector will have a radar controller.

They launched and secretly followed the Russian air defense radar controllers' vectors.

The surviving crewmembers and the radar controller were all sentenced to prison terms as a result of the crash.

It sometimes drifted to within 20 miles of this invisible boundary, eliciting warnings from Chinese radar controllers.

The operations officer stepped back to the radar controller's console and studied the display.

Prior to this moment, the radar controller had no reason to think that the landing attempt was not proceeding normally.

Modern electronic devices are used for assembling the receivers, radar controller and acquisition system.

The pilots are guided by radar controllers on the ground, unlike American pilots, who have much more autonomy.

"Patriot has the inbounds, sir," one of the other radar controllers reported.

An additional contributing factor to the crash was an error on the part of the radar controller.