With the continuous development and popularization of mobile phones as mobile communication tools, and the continuous improvement of the technical level of mobile communication tools for humans, especially the promotion and application of 3G and 4G technologies, it is useful for prisons, labor camps, detention centers, drug rehabilitation centers and other similar fields. The negative impact of this is becoming more and more prominent. In prisons, detention centers and other places of supervision, mobile communication tools, such as cell 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 development of prison management. Some prisoners call, send text messages, obtain information, and threaten witnesses by illegally smuggling mobile phones, and even form a gang to escape from prison. For this reason, it is urgent to install cell phone jammer in prisons and other prisons.
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 no base station is required within 200 meters or 300 meters of the prison area where the mobile phone signal shielding system is installed. If there is a base station, it is necessary to consider the impact caused by strong signals on the base station.
1. The influence from the layout of various buildings in the prison.
The size of each prison, the number of buildings, the structure, the size, the height of the floor, etc. They are all 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. How each prison site is distributed needs to be based on actual site conditions. design.
2. Other influences
Even in the same environment, the base station signal will be affected by wind interference, air humidity, and so on. This will also cause fluctuations in signal field strength. In addition, the field strength of indoor and outdoor is also different. Ground building structure and metal objects have a very complex adverse effect on mobile phone shielding signals
3. 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.
Fourth, what preparations should be made to establish a mobile phone signal shielding 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 it is generally only to install the shield to achieve the shielding effect or to conduct scientific and intelligent centralized-controlled 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 affiliated communication company);
Be prepared for on-site surveys and tests by distributors 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 jammers and the intelligent management system of the prison mobile phone shielding network
Regarding the cell phone signal shielding in a prison or surveillance 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 Several mobile phone signal shielding points will be installed. For these several shielding points, it is not that the project is successfully completed if the shielding effect is achieved after the boot test is installed. 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!
