Virtual Fence Passive Multi-Sensor System
EROD (Israel)
A covert, passive device designed to detect human activity independent
of a physical obstacle is the "Virtual Fence" sensor array, combining
acoustic, seismic and IR sensors to detect, locate, and identify human
activity in a protected area. The system designed by EROD can operate
passively under adverse weather conditions, in low visibility and
under heavy electromagnetic disturbances. The system enables target
detection beyond line of sight, such as movements of humans, vehicles
and low flying helicopters hidden in ground defilades.
The sensors are installed underground, in sealed boxes
containing digital signal processors and wireless communications devices,
geophones, microphones, IR detectors and power sources. the only element above
ground is a concealed camouflaged antenna. each sensor contains a processing
unit which performs target identification (ID) and direction finding (DF). The
IDDF algorithms enable monitoring and discriminating between diverse
activities, such as moving humans, digging and building work, as well as mechanical
noises such as approaching vehicles. The system can be implemented to provide
early warning for border and perimeter control, tunnel excavation, protection of
pipelines and electrical infrastructure, guarding vital installation perimeters as
well as monitoring prison fences.
