In order to prevent some criminals from using common commercial drones to engage in illegal activities such as sabotage, stealing secrets, and terrorist attacks, drone jammers are usually the first key defensive equipment. Then the question arises: What is the basic technical principle of the drone jammer? How does it interfere?
Most of the drone jammers currently on the market use high-power suppression, which means applying interference signals on multiple communication frequency bands of the drone, thereby cutting off the normal communication connection between the drone and the remote control.
The reason why drones can come and go freely to fly at low altitude, hover or perform shooting, delivery or other work tasks is inseparable from the controller using the remote control to control it remotely, and all control commands are through wireless communication. signal is transmitted. The drone signal jammer is to apply interference signals one by one to all the communication frequency bands that the drone may use, which allows the drone to be within the effective coverage of the interference signal, and the drone cannot obtain effective control.
The remote control signal of the drone includes not only the flight control command signal, but also the image transmission signal. In addition, the drone itself also has GPS navigation and positioning signals. Therefore, the interference signal emitted by the drone jammer is not only aimed at the communication frequency band of flight control and image transmission, but will also interfere with the GPS satellite positioning frequency band.
The above mentioned are only the more common drone jammers at present, because the technical principle of these high-power suppression methods of jamming signals is relatively simple, and the production cost is not high, so the purchase price of this type of drone jammer It is relatively cheap and can meet the requirements of customers for mass equipment and use.
In addition, there are a small number of drone jammers that use other technical principles, such as decrypting the communication protocol interface to directly crack the normal communication of drone s, or even take over illegal drone s. However, this type of drone jammer is rare after all, and the output is limited, resulting in generally high production costs and purchase prices. At the same time, this type of drone jammer cannot solve the communication protocol of any drone, and can only implement effective jamming behaviors against some known and a small number of decrypted drones. Therefore, their application scenarios are also subject to many restrictions.
