The mobile phone shielding system must be designed based on on-site survey data from a spectrum analyzer, quantitatively analyzing the specific communication frequency bands, mobile phone signal strength, and distribution within the entire shielding area, in order to configure various devices according to the actual situation on site Model and parameters of regional shielding equipment. Based on the design principles of mobile phone blocking system and the complex real environment of the building, the construction of mobile phone blocking system is considered as follows:
1. By analyzing the signaling level of key network channels and recombining frame encoding, the synchronization and addressing between mobile phones in the target area and the public network are disrupted, thereby cutting off the connection between mobile phones and the network from the source.
2. Only interfering with the downlink, TDD time division system adopts synchronous technology interference to ensure no interference with the base station.
3. Using digital signal processing technology to generate real-time code level interference, ensuring a 100% success rate of interference.
4. The power of each system is adjustable, with precise perimeter control to ensure no interference with surrounding residential areas.
5. Generate targeted shielding signals based on the electromagnetic environment in space, reduce interference suppression power requirements, and reduce unnecessary electromagnetic radiation.
6. Generate code level interference, and the interference power ratio should not change with the electromagnetic environment to ensure the stability of regional interference.
7. The uplink detection adopts a digital sampling scheme, which is more accurate in determining the uplink signal and has a faster response speed.
8. Adopting indoor distribution to solve the signal attenuation problem caused by complex wall environments, accurately covering every room.
9. Fully control the horizontal, vertical angles, and distances of various antennas according to different environmental requirements, select corresponding antennas, gains, directions, and equivalent technical indicators. At the same time, combined with the on-site building environmental conditions, reasonably choose the installation position, height, and direction. If necessary, add corresponding anti reflection isolation plates, control the antenna projection direction and electromagnetic power left and right after the antenna, which is superior to or meets the national environmental radio wave health standards.
10. Antenna selection: Indoor directional antennas are generally used in the room and at the end of the corridor; The large room adopts omnidirectional antennas.
