1.   Applicable methods may include ground penetrating radar, acoustics and unconventional surveillance and reconnaissance.

2.   -- Satellites and ground radars immediately begin tracking and analyzing the threat as the missile roars toward space.

3.   Components of the radio link that allows the missile to communicate with ground radar in tracking a target were found to be seriously degraded.

4.   New ground radar will also allow for a safer and more efficient use of existing runway capacity.

5.   Officials said they were using a special helicopter for ground search radar and dogs that can detect human remains.

6.   Seated at ground level but without ground radar, controllers lacked a complete view of the runways, essential for judging distances and maintaining separations between planes.

7.   So Norad is moving nearly a dozen mobile ground radars around the country to expand its coverage of the interior United States.

8.   The Air Force operates the ground radar tracking facilities that are required to ensure that commercial as well as NASA and military rockets do not stray over populated areas.

9.   The Chronicle examined numerous lapses in the FAA program, including mismanagement that has caused serious delays in the introduction of ground radar to warn of possible collisions.

10.   The recovery crew is awaiting the arrival of some sophisticated machinery from the FBI called ground penetrating radar.