Based on the current changes in the campus security environment, many new features have emerged in the campus security work in the new era. The school urgently needs to upgrade the system or re-establish a new security system based on the existing security system. The perimeter alarm system is the first important security line in the campus. It can solve the problem of illegal personnel crossing the weak campus perimeter. It acts as a key and necessary security measure in building a safe campus by blocking the illegal personnel from entering the campus to perform actions such as harming students and stealing, and exerting functions such as deterrence of illegals, blocking, and timely warning.

First, the status and problems of campus perimeter security

School border security is an important part of campus security. Perimeter measures, as the first layer of campus security, have the functions of warning, deterrence, suppression, delay, and intrusion alarm. It can not only effectively stop and delay the intrusion of objects, but also provide sufficient response time for manpower prevention. Therefore, it is more and more urgent to build a complete precautionary, preventive, and retrospective integration of the school perimeter security system. In recent years, many schools around the country have strengthened the prevention and construction of the campus perimeter. However, many schools simply increase their investment in civil air defense and physical defense, and use the formation of campus security teams, heighten the campus walls, and install campus dormitory. Measures such as installing steel bars on the windows to prevent them, obviously these measures have produced certain effects, but in the form of unscrupulous personnel constantly changing the means of committing crimes, the actual utility is very limited.

At the same time, the surrounding environment of the school perimeter is complex, and the security work is subject to long-term challenges. From the perspective of the operation of the campus perimeter security subsystem, the perimeter security subsystems of most manufacturers are not equipped with a mature and stable comprehensive security management platform, and can not be networked with campus video, access control and other subsystems. Let the security department's police efficiency drop. Campus security needs to be strengthened in terms of pre-warning and prevention work. In addition, the school physical wall engineering design and lack of attention to product selection, weakening its security role. Blindly choose some practical experience, poor performance, unsuitable for the school's perimeter intrusion products and other issues, so that the perimeter defense of the school as a deep defense, its first line of defense role to play limited.

Second, the need for campus perimeter security and the application of electronic fence

1. Campus perimeter alarm requirements

At present, many schools have relatively large perimeters, and there are many houses. It is easy for thieves to hide. At the same time, primary and secondary school students have relatively poor self-control ability. They often sneak out of school through the wall. Based on these characteristics, the campus needs to be applied to perimeter security. The main ones are as follows: First, the equipment needs absolute safety, and the damage degree is zero; secondly, it is strict to prevent stagnation and eliminate blind spots; thirdly, the false alarm rate is low, which can effectively prevent mistakes caused by small animals, branches, bad weather, etc. The fourth is to be able to network with security and IT systems, and to monitor and link. When there is an alarm, the camera will turn to the corresponding position to start recording, and play the role of real-time monitoring and risk prevention.

Based on the characteristics of campus campus and the characteristics of the off-campus environment, the campus perimeter defense equipment has great advantages, both deterrence and the function of blocking intruders from entering and extending the intrusion time, and the product has a long service life and the maintenance process needs to be convenient, so the electronic The fence alarm system has become the most suitable perimeter defense equipment for the campus at this stage.

2. Application of electronic fence in campus

(1) Basic structure of electronic fence system

The electronic fence is the most advanced perimeter burglar alarm system. It can be divided into pulse electronic fence and tension fence. The pulse fence mainly generates alarm by sensing the change of voltage value on the front alloy wire. The front fence has high voltage pulse power. Strong deterrent force; tension fence is to sense the change of pressure value on the alloy line to generate an alarm. Because the security of primary and secondary schools and kindergartens considers that students may climb over the wall, the tension fence system with no front end is generally used. The tension fence system is mainly composed of a front-end detector, an intrusion detection host, an intelligent control terminal, and a security management platform. The front-end alloy wire, the measuring lever, the bearing rod, and the bearing rod device are all sensitive to the intruder's climbing and crawling, suggesting an intrusion alarm. In addition, the alloy wire can automatically adapt to the environment to adjust the warning tension value according to changes in the external environment and climate, and reduce false alarms.

Taking the perimeter security of 35 campuses in Fangshan District of Beijing as an example, the project follows the principle of comprehensive design. The front of the campus is equipped with an electronic fence front end and a high-definition camera. The security room is equipped with MK series control terminals to deal with the police in a timely manner. in the control room alarm installation SAM200 integrated management platform, real-time view Alarming scene, and campus security subsystem has been built in conjunction with the operation, and have advanced networking capabilities, the school can facilitate real-time grasp the situation of children, while the area of Public security Bureau, The Education Bureau is connected to the Internet and, in the face of unexpected situations, can take measures quickly and accurately to ensure the safety of teachers and students on campus.

(2) The advantages of electronic fences in campus use are significant

Effective defense: The front fence is installed on the campus wall, forming an insurmountable barrier of 0.8 meters on the perimeter of the campus. The distance between the front alloy lines is between 0.15-0.2m, which enhances the intruder to climb or cross the wire. The difficulty, while blocking students from arbitrarily going out, will not cause accidental harm to the human body. Warning signs and fences also have a deterrent effect on intruders, effectively reducing the motives of intruders.

Precautions are strict: according to the campus perimeter laying, with the access control system, eliminating the safety blind spot, breaking the limitation that the infrared radiation is only suitable for the flat rule unobstructed area, and automatically adapting to the outdoor long-term temperature and humidity changes, and resisting harsh environments, etc. The rate of false positives is small.

Intrusion alarm: Realize front-end fence climbing alarm, disconnection alarm, slack alarm and front-end detection rod tamper alarm, etc. The climbing alarm can also directly locate the rod position to achieve precise positioning of the intrusion position. It can also accurately identify the intruder's intrusion behavior and accurately distinguish the human body from the small animal's touch.

Multi-system linkage: The electronic fence host forms a multi-level management system through 485 bus or network with intelligent keyboard and management platform software. It also supports multi-system linkage with video surveillance system, broadcasting system, electronic patrol, one-button alarm and other systems in this project. To protect the safety of teachers and students on campus.

Multi-level management: The Education Bureau and the Public Security Bureau can monitor the security of the campus perimeter in real time through the security management platform. When a dangerous situation occurs, the school can send an alarm message to the District Education Bureau and the Public Security Bureau through the monitoring center. The school video can be linked when the alarm is issued, and the incident can be monitored remotely, and the police can be alerted in time to avoid major safety accidents.

In recent years, video surveillance systems have been popularized in major universities, junior high schools and kindergartens. However, the function of providing post-mortem verification is obviously unable to meet basic warning and alarm requirements. The electronic fence system can realize the function of pre-warning, and will alarm system and alert. The system is effectively combined to achieve the purpose of prevention and prevention, and highlights the position of the perimeter electronic fence warning in the security system.

Third, the development trend of perimeter security

The fundamental purpose of perimeter intrusion prevention is to use various advanced sensing technologies to identify illegal intrusions, prevent and prevent the occurrence of vicious incidents, and solve the limitations of traditional civil air defense in terms of time, region and personnel energy. With the continuous expansion of security application sites, the reliability and false alarm rate requirements for intrusion detection products are getting higher and higher. The electronic fence has made a qualitative breakthrough in technology and function in recent years. From the current technology trends, In the future, the development of the following aspects will be more prominent:

1. Intelligent management software technology is a general trend

Although the perimeter alarm industry has been developed for many years, there are very few perimeter alarm manufacturers that can truly achieve intelligent platform management. 90% of the manufacturers are limited by the company's overall technical strength and other reasons, often through the switch to other manufacturers management. The platform cannot be integrated and systematically integrated.