Sensor Fusion Example #4

Boolean Logic vs Sensor Fusion - Thunderstorm with Guard and Intruder

For this example, we have a thunderstorm with consistent wind, a guard (in blue) and an intruder (in red) on the opposite side of the site.

Boolean Logic

The Boolean system detects fence movement in zones A, B, and F, and because people are identified in both zones B and F, alarms will be reported for each subsegment of those two zones. That results in eight alarms being triggered, one alarm is an actual intrusion attempt and seven are nuisance alarms. Unless security operators are being careful to systematically confirm the situation with each alarm, the fact they can see the known guard may cause them to ignore the many nuisance alarms and miss the unknown intruder.

Sensor Fusion

The sensor fusion system can distinguish between the guard and the unidentified person because it’s able to correlate slight fence motions with the camera detection. In addition, the wind movements do not trigger human-like patterns, suppressing the nuisance alarms created by the wind in subsegments of each zone where a person is present. This results in one alarm correctly reported for the intruder.