For a long time, the mobile phone signal management and control system has provided strong technical support for police officers. For the identification, tracking and positioning of target mobile phones, as well as blacklist and whitelist information management and control, each functional module has accelerated to a large extent. The process of handling cases has improved the efficiency of case detection. The use of a frequency jammer is a relatively simple, direct and even crude solution, which can quickly isolate or block mobile phone signals in the target area. Recently, customers in the judicial system often ask us: During the construction of the vehicle frequency jammer project, can it be considered to integrate the mobile phone signal control system with it into a modified vehicle so that the two sets of products can be used together? ?

The customer's original intention was to integrate the mobile phone signal control system, which has worked well in the past, into the same car when the car is refitted with the frequency jammer. In the future, when handling cases, the vehicle can be used as a carrier to achieve rapid The final result of the transfer and on-board tracking of the target. In this way, one vehicle can be used for two purposes, or the expected value can be raised higher: integrate the functions of the vehicle frequency jammer and the mobile phone signal control system, so that the respective advantages and functions of the two can complement each other and learn from each other.

However, there are certain technical difficulties in this approach. Customers may have overlooked the precautions in the past use of the mobile phone signal control system. Most of the working scenarios of the system are used in a static environment. In the process, there are not many tasks to perform mobile phone signal control. And there is an obvious difference from the working mode of the vehicle-mounted frequency jammer: the mobile phone signal control system will at least include a receiving antenna and a transmitting antenna, but a frequency jammer only has a transmitting antenna.

As far as we know, when the mobile phone signal control system is actually tested during high-speed driving, its working efficiency will be significantly weaker than that used in a static environment. The main reason for this result is that the mobile phone signal control system needs to dynamically collect the information of the surrounding mobile phone base stations in real time. When the vehicle is driving at high speed, the information of the base stations along the way is constantly switching and updating data. The frequency jammer on the vehicle does not have to worry about it because there is no influence of the receiving link.

There is also a technical problem that may be faced when these two systems are built together on one vehicle: although the vehicle-mounted frequency jammer and the mobile phone signal control system are integrated on the same vehicle, in most cases the two cannot work at the same time.

The reason lies in the detection of the receiving antenna and the signal environment of the mobile phone signal control system. Once the frequency jammer is turned on, it will continue to emit high-power interference signals, although the frequency band of some interference signals is different from that of the mobile phone signal control system. The receiving frequency bands do not overlap, but because all the receiving antennas and transmitting antennas are integrated in the 2 square meter area on the top of the vehicle, within a short distance, the strong electromagnetic interference caused by the transmitting antenna of the frequency jammer This phenomenon will definitely have a very serious impact on the receiving ability of the receiving line.