Perimeter intrusion detection means that outside objects (people, cars, or other objects) enter a prescribed area without permission, and prevent or alert supervisors through a certain method or method. So what kind of intrusion detection form, what are the current intrusion detection technology? Flying Lasers will conduct a preliminary discussion of this technology.
Perimeter Intrusion Detection System Overview
1 Overview
The perimeter is a broad concept. It is as large as the national boundary of a country, as small as a unit such as the confines of institutions, universities, and enterprises; the perimeter is both a defining symbol of the sovereignty of a country or unit and it is also The first line of defense against invasion, vandalism and theft. In some important areas, such as airports, military bases, prisons, bank vaults, museums, power plants, oil depots, etc., in order to prevent illegal invasions and various sabotage activities, traditional preventive measures are in the periphery of these areas. Place some barriers or barriers (such as iron fences, fences, wire fence nets, etc.) and arrange personnel to step up patrols. In the current situation where criminals use advanced science and technology and criminal means are more complicated and intelligent, the traditional preventive measures have been difficult to adapt to the needs of the key departments and security units. Manpower prevention is often affected by factors such as time, region, quality of personnel, and energy. It is also inevitable that loopholes and mistakes will occur. Therefore, the installation of an advanced perimeter detection and alarm system becomes a necessary measure.
Perimeter intrusion detection usually refers to the monitoring of a linear boundary (such as the fence of an important area), and generates an alarm when it is found to have illegally passed the boundary. Because the regional intrusion detection needs to take into account a whole plane at the same time, it has a certain degree of difficulty. Therefore, in actual applications, perimeter intrusion detection is often used instead of regional intrusion detection, that is, perimeter intrusion detection is used at the boundary of the target area, and it is assumed to enter. The behavior of the target area first touches the perimeter intrusion alarm (in most cases, this assumption is established) to achieve monitoring and protection of the target area.
Perimeter intrusion detection is constrained by various conditions such as terrain, topography, climate, and weather, so the detection requirements are high and the difficulty is also great. The existing perimeter intrusion detection products have a small variety of options and little room for selection; domestic products have low sensitivity and high false alarm rate; the current situation of imported products with high prices and large investment is the consensus of the security industry. Therefore, perimeter intrusion detection has always been an important research topic in the social public safety and security industry.
2, perimeter intrusion detection system composition
A complete perimeter intrusion detection system should include the following sections:
â—†Direct performance
Direct performance is what we most intuitively feel. It shows the deterrent power of the entire perimeter detection system and clearly shows the boundaries and scope of the defense zone.
â—† Detector
The detector is the core part of the whole system, and the sensitivity of the detection directly affects the miss rate and false alarm rate of the entire system.
â—†Signal transmission
Signal transmission is the vein of the entire perimeter intrusion detection system. In the small perimeter intrusion detection system, our most common transmission layer equipment is signal line or wireless transmission. For medium and long-distance monitoring systems, we often use RF lines and microwaves. For remote monitoring, we usually use Internet this cheap carrier. It is worth mentioning that the emerging transport layer media - optical fiber.
â—† Signal processing and analysis
When the signal is transmitted to the host, filtering, amplification, etc. should be performed. The host analyzes the signal according to the parameters set by the user to determine whether an alarm is required.
â—†Control section
The control part is equivalent to the brain of the entire system and is responsible for the deployment of the entire system task. The detection sensitivity and alarm output are controlled according to the user's parameter settings.
â—†Actuator
The executing agency is the last part of the system. It directly tells the user if there is any intrusion in that zone?
3, intrusion detection system classification
At present, the world's perimeter detection alarm equipment and systems are mainly used in the following categories:
â—† Active infrared alarm system
â—† Microwave Wall Alarm System
â—† leaky cable perimeter detection
â—† Vibration cable alarm system
â—† Optical fiber sensor perimeter alarm system
â—† Laser shot
â—† tension wire
â—† Electrostatic induction
â—† Mobile video
â—† Vibration detection
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