• SafePerimeters team

What is a Perimeter Intrusion Detection System (PIDS), and how it can assist to protect my assets?


Perimeter intrusion detection systems (PIDS) are literally the first line of defence or pre-warning for protection of people, facilities and assets. It just makes sense that boosting their effectiveness ensures better security overall; any intruder that is detected at the perimeter no longer poses a threat to your business or to a UHNWI private residence.


There are four main types of perimeter intrusion detection systems.

Barrier-Mounted– Fence Intrusion Detection System, deployed on or in conjunction with a fence or other physical barrier

Ground-based or Below-ground- deployed below ground, these do not require a physical barrier.

Free-Standing- deployed above ground that does not need to be installed on or in conjunction with a physical barrier

Rapidly Deployable- that are designed for temporary deployment; for example, to protect a mobile asset. Typically, this would cover military applications, construction sites, sport events, music concerts.

All four types of PIDS can be based on defend types of sensors technologies, vibration, electronic, Seismic, laser, microwave, and infra-red, electrical, analytic CCTV and more. . .


When we plan the security of a site, the first thing in planning will be to diagnose “Concentric Circles of Protection,” which involves the use of multiple “rings” or “layers” of security. The first layer is located at the boundary of the site, and additional layers are provided as you move inward through the building toward the high-value assets.


A holistic approach to outdoor physical perimeter security is one that determines a facility’s first line of defence where technology is designed to deter, detect, delay and deny entry.


The perimeter defence strategy will be planned according to the security and protection needs (threats & risks), and when deciding on the specification and selection of any PIDS system the following factors must be taken into consideration:

• Landscape, flora, fauna and topographical features

• Integration with other types of equipment or systems

• Climatic conditions

• Local regulations

• Presence (or lack of) physical barrier and robustness against threats

• Duration of required deployment (rapidly deployable PIDS)

• Response force arrangements

• Personnel on site

• Level of client security required


All of these factors will affect the key choices made by an organisation and there are also other-point to consider including:

• Whether a line of site technology is appropriate.

• Does the detection system need to be covert (buried or hidden)?

• Are there specific electromagnetic interference issues that will affect specific technologies or are there requirements for the technology to be intrinsically safe (on oil rigs or process plants)?

• Is there existing infrastructure to mount the system or whether it will be part of a new build?

• How does the system integrate with the overall security strategy?

• What constitutes an alarm and what action is taken in the event of an alarm (audio alarm, visual alarm or a combination)?


Recent technology evolutions and trends are having a direct impact on the performance and evolution of PIDS systems. These include developments in signal processing, artificial intelligence (AI), machine learning, data analytics, as well as improvements in computing technologies and their processing power. By leveraging some of these new technologies and developments, the quality, reliability, and performance of PIDS sensors can be greatly enhanced.


The most important performance measure of any PIDS system is its ability to maintain a high probability of detection (POD) to intrusions while minimising nuisance alarms, in particular, those caused by wind, rain, traffic or other nuisance activities. To tip the scales in favour of POD, intelligent and advanced algorithms are required so that the PIDS system can adapt to different environments and intelligently discriminate between intrusions and nuisances.


How PIDS can assist to protect my assets?

The main difference between PIDS to CCTV cameras (not including analytic CCTV and smart thermal system) is that with CCTV we can see the intruders and what they did on the next morning while with PIDS we can immediately prevent or delay the intrusion leading to crime, vandalism and potential loss of money and time involvement after an event.


The PIDS will immediately detect the intruder on the fence or perimeter and can operate a number of additional systems as a further deterrent, if required:

• Alarms / sirens / buzzers

• Flashing lights / spotlights / searchlights

• Open directed CCTV cameras to the point on the perimeter were the intrusion is taking place, in order to collect information of what the security force is going to be face, as well as to document the event.

• Send alert to the security company or to the closest Police station.


The first two points can prevent the intrusion at the perimeter by surprising the intruder and makes them turn away. But, if the intruder has made a decision to continue into the second circle of the site, the fact that we can create an alert on the perimeter gives the onsite security team between 30 - 90 seconds, or more, of pre-warning time before the intruders reach a building. This time saving can help massively reduce the impact of damage, theft, personal injury, etc. as the individuals are intercepted before further issues can arise. This overall can drastically reduce company operating losses or save an individual who may be at risk and who may need to escape to a safe room.




For more information or a discussion on your security requirements, contact Tel: 020 8555 6800 or info@safess.co.uk

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