With the continuous development and popularization of mobile phones as a mobile communication tool, and the continuous improvement of the technical level of people's mobile communication tools, especially the promotion and application of 3G and 4G technologies, its impact on prisons, labor camps, detention centers, drug rehabilitation centers and other similar fields negative effects are becoming more prominent. In prisons, detention centers and other places of supervision, mobile communication tools, such as cell phones, are expressly prohibited, not only to prisoners but also to supervisors. Once the mobile phone is brought into prison and put into use, it will bring great harm to the development of prison management. Some prisoners call, send text messages, obtain information, and threaten witnesses through illegal smuggling of mobile phones, and even form gangs to escape from prison. To this end, the installation of cell phone signal blocking systems in prisons and other prison premises is imminent.
At present, the power and channel of each base station are different, and the distance between each base station and the prison is also different. It is generally recommended that a base station is not required within 200 meters or 300 meters of the monitoring area where the mobile phone signal shielding system is installed. If there is a base station, it is necessary to consider the impact of strong signals on the base station.
1. Influence from various building layouts in prisons.
The size of each prison, the number of buildings, the structure, the dimensions, the height of the floor, etc. All are different. The distribution direction, power, terrain and other factors of mobile phone base stations around each prison are different. The strength of mobile phone signals transmitted from remote base stations is also different. How to distribute the sites of each prison needs to be determined according to the actual site conditions. design.
2. Other influences
Even in the same environment, the base station signal will be affected by wind interference, air humidity, etc. This will also cause fluctuations in the signal field strength. In addition, there are differences in the field strength between indoor and outdoor. Ground building structures and metal objects have very complex adverse effects on cell phone jammers.
3. Selection and technical indicators of shielding equipment
The selection of jamming equipment should be reasonably planned according to the project funds. The selection of shielding equipment should pay attention to the size of its shielding radius (that is, the power), performance stability, and life expectancy. 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.
4. What preparations should be made to establish a mobile phone signal shielding system
Determine the scope of the shielded area, whether it is the key area (or inside the building) in the prison area or the entire fenced compound;
Clarify the expected planning and effect of the shielding project, including the planning funds for the entire mobile phone shielding project, whether it is to simply install the shielding device to achieve the shielding effect or to carry out scientific and intelligent centralized control shielding;
Prepare the unit floor plan and mark the name, layout, size, 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 around 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 telecommunications company);
Prepare for on-site investigation and testing of dealers or manufacturers of mobile phone shielding system construction projects in the future;
5. Comparison of the advantages and disadvantages of the traditional scheme of only installing the shielding device and the intelligent management system of the prison mobile phone shielding network
For the cell phone signal shielding in a prison or supervision area, whether it is the method of using low-power cell phone isolators, or the scheme of using high-power cell phone jammers as the main and low-power jammers to supplement the blind area, the entire prison area will be shielded. A number of mobile phone signal shielding points will be installed. For these shielding points, it is not necessary to install and start the test to achieve the shielding effect to count as the successful completion of the project. How to ensure that these mobile phone signal shielding points will be normal and stable in the future. The operation of the mobile phone is the key to the entire mobile phone signal blocking project!
