In its civil role the civilian personnel (using the military radar) controlled air traffic, primarily over the Atlantic to ensure correct height and separation.

But by staring at the sky for a month, it could detect pulses of any powerful military radar out to a distance of 30 light-years.

If we had cable television only and no big military radar, then maybe they would not know about us.

Then, military radar detected them in enough time for warnings that gave Israelis a minute or more to take cover.

This was to have important consequences not just for military (and civil) radar systems but later for the new science of radioastronomy.

About two-thirds of Colombia's airspace is now covered by civilian and military radar.

"So military radar confirms an object in jamming position."

Moreover, military radars in the region can track the missile and aid the extrapolation process.

These are among the problems from previous years: * A blip over the North Pole appears on military radar.

Only military radars see the aircraft themselves, and what African country has a proper air-defense network?