The smart public network signal blocking system is a new public network signal (mobile phone signal) management and control system launched by Shenzhou Mingda in 2016. The system is composed of a receiving end, a sending end, and a digital signal processing module. It adopts domestic advanced signal processing methods. To achieve green shielding and intelligent management and control of public network signals in the supervision area, which is different from traditional shielding methods: more accurate management and control, more obvious management and control effects, fewer equipment, shorter construction periods, and no radiation. Do not cause interference to non-controlled areas.
Signaling level digital processing technology
The product consists of a receiving end, a transmitting end, and a digital signal processing module. The working principle of the system link is that the receiving end receives a mobile signal through an antenna, and passes through a filter, a low noise amplifier, an analog mixer, an analog-to-digital conversion (ADC), and an FPGA Digital down-conversion (DDC), digital signal processing in DSP, digital up-conversion (DUC), digital-to-analog conversion (DAC), and analog mixing are carried out after digital down-conversion (DDC), digital signal processing in DSP, and analog mixing before entering the power amplifier, and then the high power jammer is sent through the antenna Go to the shielded area.
TD pilot frequency synchronization technology
TD pilot synchronization shielding can effectively select the plutonium of the downlink pilot of the TD signal for shielding. After synchronization, the shielding power can be accurately applied to the plutonium part of the downlink pilot, preventing interference to the base station and greatly reducing electromagnetic radiation.
Note: Mobile 3G and 4G use the same frequency time division duplex technology, and traditional white noise maskers will inevitably interfere with the uplink time slots of the base station.
Accurately shield frequency points and bandwidth, control spurs, and open the function of police communication in the future
The smart phone shielding system can accurately shield the frequency band and bandwidth, and can well control the out-of-band spurs.
Multi-frequency combined circuit and common cable technology for large and small power modules
You can choose antennas of different types, sizes, and indicators to extend the distance between the antenna and the host, and divide them into the shielding area one by one.
The power can be adjusted according to the required power of different types of antennas
Full-band, multi-frequency shielded signals can be transmitted through a combined cable
All frequency bands, large and small power full sweep modules and digital frequency hopping modules can be combined freely