SBInet was meant to also include some ground sensors for seismic detection as well.

Soldiers also help with sophisticated equipment, like night-vision equipment and ground sensors.

Accuracy varies as a function of the location of the targets vs. ground sensors.

Their ground sensors gave no sign that anything was trying to undercut them.

Law-enforcement agencies also use listening devices, X-ray equipment and ground sensors buried in certain locations.

The ground sensors installed along the border frequently sounded alarms.

A few years ago, listening devices, called unattended ground sensors, weighed 30 pounds and were lugged into enemy territory by troops.

Ugs fleet, a collection of military ground sensors.

May have dropped ground sensors in the Bosnian War.

Stadium lighting, ground sensors and infra-red cameras were also placed in the area.