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Traditional perimeter detection and alarm technology limitations
Perimeter security system refers to a defense system and system that defends the boundary of a certain area or alarms when the boundary is invaded by foreign objects. The perimeter security system has gradually evolved from the original pure physical precautions (fences and glass laying on the top of the wall) to the comprehensive perimeter security system that combines physical defense, technical defense and human defense.
The current perimeter security system can be roughly classified into: infrared technology detector, vibration cable, fiber perimeter warning system, buried leak cable, tension fence perimeter alarm system, static induction perimeter alarm system, traditional high voltage grid, pulse Electronic fence perimeter alarm system and emerging intelligent video analysis system. The existing perimeter security system has made due contributions to social security, but there are still some shortcomings due to some objective technical conditions or environmental factors. The above techniques are briefly analyzed in conjunction with feedback from application units in the industry.
Laser detector
Affected by weather factors, the direction is demanding and the installation is difficult. False positives such as birds and branches can not be correctly identified; they are susceptible to bad weather such as dust and fog, and the rate of false positives is high in such areas. At the same time in the station yard
Microwave detector
Electromagnetic radiation will be generated and the system has a high false alarm rate. The swaying of the fence, the movement of metal objects, the passage of animals or birds, the debris blown by the wind, the surface water and vegetation, the sand and the falling snow can cause systematic false alarms.
Vibration cable technology
The monitoring distance is long, the implementation is simple, and there is no monitoring blind zone, which is suitable for perimeter monitoring of various shapes. The “point impact†identification can effectively remove the interference of wind, rain and snow, but the technology is susceptible to electromagnetic interference, which is greatly affected by lightning, and it is easy to produce false reports in rainy days. At the same time, the entire station defense zone is invalid after the vibration cable is cut. Repair is more difficult.
Electrostatic induction perimeter is too expensive
Electronic fences, power grids and other programs have certain personal hazards.
In addition to its own defects, the above-mentioned existing perimeter security systems have the common disadvantage that the detection devices used are external devices, and the power supply and data path of the external devices are separated, which increases material cost and construction cost, and is externally connected. The fixed position and space of the equipment need to be specially designed and difficult to adjust and move after being placed, thus making the perimeter security system lack sufficient flexibility.