The Patriot missile system uses its ground-based radar to find, identify and track the targets.

This is because the ground-based radars are distant from the target and the returned signal lacks resolution.

Ground clutter generally appears in a circular region within a radius of about 25 miles near ground-based radar.

Perhaps the simplest way to deal with an enemy's ground-based radar is to destroy it, using its own beam as a guide for a missile.

They also appear to have three ground-based radars, and they're moving them around a lot.

Soon the American aircraft would be so close that the ground-based radars could bum through the jamming.

But data from ground-based radar showed a "much lower" speed, the officials added.

They noted that while the test had failed, other parts of the system, including the ground-based radar, had worked.

Ten minutes later it was clear that every ground-based radar in the country was lit up to full power.

In early examples, these were ground-based radars with all the equipment necessary for tracking.