Home' RTCA Documents for Review : DO-230H FRAC Contents 172
© 2017, RTCA, Inc.
Video surveillance supports PACS (Chapter 4), PIDS (Chapter 5), and SOC (Chapter 7) functions. When
video imagery is integrated with the PIDS, and displayed in the SOC, it provides essential information for
perimeter monitoring, target assessments, and incident management.
For most airports, CCTV cameras will be the primary means of imaging targets because of their relatively
low cost and high reliability. Airport monitoring is usually a 24x7 operation. Exterior monitoring requires
that the imaging sensors be able to perform detection and assessment functions at night and in poor weather
conditions. Night performance may require image intensification devices, which are costly, but for airports
near major cites the available sky glow at night plus any perimeter lighting that exists may suffice provided
the video cameras are fitted with optics designed for low-light conditions.
Where camera performance is marginal, it may be more cost-effective to increase the level of illumination
in the area by using higher wattage blubs or by adding additional lighting fixtures. The maturing
commercialization of low-wattage LED luminaries makes this an attractive option to consider.
Exterior camera spacing is also dependent on local lighting and weather conditions at the site. Closer
spacing is required to meet performance objectives in these conditions, and thus cost is impacted.
In the absence of ambient lighting, and for conditions of fog and smoke, the selective use of more expensive
thermal imaging cameras may be appropriate. Additional guards may also be necessary during such
Video management deals with how video imagery is processed, stored, and integrated with other functions
such as PACS alarms and situational awareness software in the SOC. In the case of the SOC, video
management applications can be used to manage operator displays and video wall displays, to call up
specific sensors and manage their functions, to retrieve and plan back recorded video, etc.
When feasible, video imaging devices could be coupled to analytic and situational awareness software in
the SOC in order to automate routine surveillance monitoring functions.
Video storage warrants particular attention during ISSA design because storage is often a major cost
element as well as a management challenge. Video storage is a fundamental aspect of the video management
system design. Digital video storage is recommended because it enables image enhancement, frame
compression, integration with analytical functions such as tripwire detection, rapid access to important
video streams, and security measures such as frame encryption and operator access permissions.
The system design should provide for convenient, multiple factor indexing of stored imagery so that
pertinent frames can be quickly accessed based on a number of factors including camera ID, date and time,
type of event trigger, etc. The video storage subsystem location should be transparent to operators, who
should be able to call up recorded video streams to be viewed if they have the necessary authorization.
Imager Operational Performance
The performance of an imaging sensor depends on a number of factors including:
Characteristics of the object to be observed – its dimensions and aspect relative to the video camera,
reflectance, contrast and emissivity.
Local environmental conditions – atmospheric transmittance (clear, foggy, snow) and turbulence;
the level of scene illumination (expressed in foot–candles or lux) and its variation over the 24-hour
cycle; the type of artificial illumination (incandescent, metal halide, mercury vapor, sodium vapor,
LED, etc.); how the cameras are situated with respect to that lighting, and the presence of strong
light sources (street lamps and headlights) and glare in the scene; etc.
Links Archive Navigation Previous Page Next Page