If the area that needs to be shielded by signal jammers is located in a busy urban area or densely populated area, and there are many ordinary people gathering in the surrounding area, it is not recommended to operate the signal jammer system continuously for a long time. This is because several essential signal interference frequency bands in the signal jammer system completely overlap with the communication frequency bands required by ordinary people's lives, such as the civil navigation positioning frequency band of GPS, the WIFI 2.4G frequency band and 5.8G frequency band of wireless networks. Once the signal jammer is turned on and working, effective interference will inevitably occur against these three basic frequency bands. The result of this is that in the disturbed area, the drone flying black will naturally be interfered with, but at the same time, ordinary people in this area, such as mobile navigation, car navigation, etc., may also show a failure state. At the same time, it will also be found that there will be communication difficulties in the office or residential WIFI wireless network, Bluetooth devices, etc.