Home' RTCA Documents for Review : DO-230H FRAC Contents 156
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Detection Capabilities – Automatically able to detect moving objects in a scene. Thresholding must be
applied to limit false/nuisance alarms. Some systems are also capable of tracking an object as it moves in a
camera’s field of view.
System Limitation –
Inclement weather can significantly degrade the effective range of detection and/or cause
significant nuisance alarms.
Changing light / illumination within the detection zone can cause nuisance alarms.
Forested areas or locations where foliage is moving in the detection field of view can cause nuisance
alarms or require extensive tuning of the analytics to be functional.
VMD systems can only detect objects within their line-of-sight and within the specified detection
zone. Coverage of large areas will likely require multiple VMDs. Nuisance alarms can be generated
by detection of foreign objects such as trash or brush blowing, or animals moving through the
detection area or by random reflections and shadows.
VMDs require stationary cameras which are not able to track an intruder once they leave the field
Thermal (LWIR) Video Analytics w/GPS Location
General Characteristics – Thermal video cameras with GPS intruder positioning provide a high degree of
detection accuracy and low nuisance alerts in the wide range of lighting environments typical of an airport.
Thermal cameras are known for nighttime applications including zero light conditions but they have
significant advantages when used with analytics in the presence of vehicle and aircraft headlights, direct
sunlight, reflections off water and other difficult lighting situations. Thermal cameras with GPS video
analytic intruder positioning, provide stable 24-hour, four-season capability for detecting pedestrian and
vehicle intrusions over airport perimeters.
This detection technology can be applied to typical airport environments to include open areas, fence lines,
and waterside environments.
Range – Typical pedestrian intrusion detection distances at airport range from 60 meters (gates and jogs in
the fence) through 600 meters (flat open fence line) depending upon terrain, topology and environmental
requirements. Typical mounting heights are five to seven meters from the ground. Camera layouts should
address the blind spot around each camera’s pole.
System Considerations –
To achieve reliable detection performance, inbound detection ranges should be used in all cases.
Inbound detection range is defined as a pedestrian intruder walking directly towards the camera.
Pole sway caused by weather, aircraft and other factors should be addressed in the pole design itself
or can be accommodated through electronic stabilization to maintain a high Probability of Detect
and low nuisance alerts.
Fog and high humidity can degrade detection range. Perimeter designs should de-rate the camera’s
clear-weather detection range to address deployments located in high fog areas.
NEMA4X nitrogen-purged cameras maintain systemic integrity through the elimination of dust and
humidity for stable performance and long operating life.
A clear line-of-sight is necessary for the detection area.
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