With the continuous development and popularization of mobile communication tools, and the continuous improvement of the technical level of personal mobile communication methods, especially after the promotion and application of 3G and 4G technologies, it will be used in areas such as prisons, labor camps, detention centers, and drug rehabilitation centers. The negative effect of the mobile phone is becoming more and more prominent. In prisons, detention centers and other supervision places, mobile communication tools such as mobile phones are explicitly prohibited, not only for prisoners, but also for supervisors. Once the mobile phone is brought into the prison and put into use, it will bring great harm to the management, safety and development of the prison. Some prisoners use illegally smuggled mobile phones to make calls, send text messages, obtain information, threaten witnesses, and even form gangs and organize escapes. Because of this, the installation of mobile phone signal jammer in prisons and other prison places is imminent. Degree!
At present, China Mobile, China Unicom, and China Telecom have built hundreds of thousands of base stations across the country. The power and number of channels of each base station are different. The distance between each base station and the prison is different. It is generally recommended to install a mobile phone signal shielding system. It is best not to have a base station within two to three hundred meters near the area. If there is a base station, you need to focus on the impact of the base station being too close and the signal being too strong!
Influence from the layout of various buildings in the prison
The scale, number of buildings, structure, size, floor height, etc. of each prison are different. The distribution direction, power, and terrain of mobile phone base stations around each prison are different. The strength of mobile phone signals transmitted from remote base stations is also different. There is no difference. How to arrange the points in each prison needs to be designed according to the actual situation!
Other influences
Even in the same environment, the base station signal is affected by wind disturbance, air humidity, etc., which will cause fluctuations in signal field strength. In addition, there are differences in field strength between indoor and outdoor spaces, and the ground, building structure, materials and metal objects affect the mobile phone. Shielding the signal causes very complex adverse effects.
Selection and technical indicators of shielding equipment
Reasonably plan the selection of shielding equipment based on project funding. The selection of shielding equipment should pay attention to the size of its shielding radius (ie power), performance stability, life span, etc., and determine whether to choose the type according to the site environment At the same time, consider using a mobile phone signal jammer with adjustable radius (that is, adjustable power), or using a directional antenna to control the main emission area (direction) of the shielded signal.
What preparations should be made to establish a cell phone jammer system
Clarify the scope of the shielded area, whether it is a key area (or inside a building) in the prison area or the entire enclosed compound;
Clarify the expected planning and effects of the shielding project, including the planning funds for the entire mobile phone shielding project, whether to install a shielding device to achieve the shielding effect in general or to conduct scientific and intelligent centralized control shielding;
Prepare a plan of the unit and mark the name, layout, size, and floor height of each building in the prison area. At the same time, the surrounding environment of the prison should also be marked, especially the location of office areas, residential houses or social factories and enterprises within a few hundred meters of the fence;
Divide key shielded areas, non-key shielded areas and areas that do not need to be shielded;
Understand the distribution of base stations around the prison (location and communication company);
Be prepared for on-site surveys and tests by distributors or manufacturers of mobile phone shielding system construction projects.
Comparison of the advantages and disadvantages of the traditional solution of only installing jammers and the intelligent management system of prison mobile phone shielding network
Regarding the cell phone signal shielding in a prison or supervision area, whether it is the method of using low-power jammers for cellular layout, or the scheme of using high-power mobile phone jammers as the main and low-power jammers to supplement the blind areas, the entire prison area will be Several mobile phone signal shielding points will be installed. For these several shielding points, it is not that the project is successfully completed after the power-on test is installed and the shielding effect is achieved. How to ensure that these several mobile phone signal shielding points are normal and stable in the future The operation of the mobile phone signal shielding project is the key!