A connected layered model instead of isolated solutions
Physical security today rarely fails because suitable technologies are missing, but because it is not implemented as a consistent system. In many critical infrastructures, individual solutions are installed side by side: cameras on the building, cable-based sensors on the fence, separate systems for interior spaces. In his guest article, Andreas Bollu, Vice President Business Unit Security at Blickfeld, shows how multi-layered security architectures with 3D LiDAR as the central sensor technology can overcome this fragmentation.
The modern approach is based on multi-layered security architectures that are not only structurally graded but also built on a consistent sensor technology. 3D LiDAR makes it possible to cover different security zones with a uniform physical measurement principle and thereby generate a consistent situational picture.
A five-zone model for optimal perimeter protection
Multi-layered security concepts, also referred to as multi-layered security, are based on a spatially organised shell model. The site to be protected is divided into security zones that build on one another, with each zone addressing specific threat scenarios and having its own requirements for detection, assessment and response.
Zone 1: Approach zone outside the perimeter
The outermost level lies deliberately outside the actual perimeter and serves the early perception of potential threats. The focus here is not on immediate alerting but on generating a reliable situational picture. Movements of people or vehicles are recorded and classified in terms of their relevance, whereby data protection requirements must be strictly observed.
Zone 2: The perimeter boundary as a critical transition
With the transition to the perimeter, the quality of events changes fundamentally. The physical barrier marks the point at which a potential threat can become a concrete security incident. The focus shifts from observation to unambiguous detection and localisation, whereby harmless influences must be distinguished from actual intrusion attempts.
Zone 3: Open ground between perimeter and building
Once the perimeter has been breached, the continuous tracking of movements takes centre stage. Movements must be recorded consistently across the site, irrespective of topography or lines of sight. This gives security personnel a dynamic situational picture with information on position, direction of movement and potential targets.
Zone 4: Gates and access roads as control points
Defined transition points such as gates, driveways or barriers concentrate the flow of traffic. Movements are permitted here in principle, but only under clearly defined conditions. The system must not only detect that something is moving but also assess whether that movement complies with the rules.
Zone 5: Building facade and roof
The building structure forms the last external barrier before the protected interior areas. Detection systems must work with particular precision here and identify behaviour patterns that indicate an intrusion. At the same time, demanding environmental conditions such as weather influences or changing light conditions must be reliably compensated for.
3D LiDAR as a consistent sensor technology
The effectiveness of a multi-layered security architecture depends decisively on how well the technologies used work together. Heterogeneous system landscapes frequently lead to fragmented situational pictures and increased operating effort. Different sensor types deliver data of varying quality and logic, which complicates interpretation and increases susceptibility to error.
3D LiDAR plays a special role because it can be deployed across several security layers. The technology is based on the precise three-dimensional capture of objects and movements and works independently of ambient light. This makes it suitable for outdoor areas as well as interior spaces.
Advantages of LiDAR technology
- A consistent data basis across all security zones
- Uniform interpretation of events according to the same physical principles
- Software-based definition of detection areas without hardware changes
- Direct data processing in the sensor reduces latency
- Anonymous capture of three-dimensional data for data protection compliance
- Simplified integration into higher-level systems such as VMS and PSIM
Integration into modern video surveillance
Instead of combining a multitude of specialised individual solutions, LiDAR acts as the central detection system, while complementary technologies such as cameras are integrated to create redundancy and to verify events. This approach makes it possible to reduce complexity while improving system performance.
Modern security platforms aggregate the information from the various layers and thus enable a holistic assessment of the situation. This creates inherent redundancy within the system: even if one protective layer is breached, further layers are available that can delay or prevent further penetration into critical areas.
Implementation in practice
The real strength of multi-layered approaches lies in their interplay: events are not viewed in isolation but brought together and contextualised across several layers. Early detection in the outer zones considerably extends the time window available for an appropriate response.
Indoors in particular, the task changes fundamentally. Instead of large-area surveillance, the focus is on the targeted protection of clearly defined zones and objects. Server rooms, production facilities or individual security-critical assets require highly precise, volumetric detection of movements, while regular operations must remain entirely unimpeded.
Outlook: integration instead of fragmentation
Multi-layered security architectures offer a structured and practical approach to protecting complex sites effectively. However, they only realise their full potential when the individual layers are interlinked not just organisationally but also technologically.
The consistent use of a uniform sensor technology such as 3D LiDAR enables this interlinking, reduces system discontinuities and improves the quality of detection. At the same time, integration into a sensor network remains an essential part of modern security architectures. Only the interplay of complementary technologies creates the necessary redundancy and reliability required in critical infrastructure in particular.
