Uav jamming technology uses radio frequency interference to block UAV communication and realize control failure. Electromagnetic jamming, GPS jamming, signal shielding and optical jamming have their own characteristics. The electromagnetic interference system is designed to maximize the interference effect and ensure the safe management and privacy of the UAV. At present, the mainstream means of intercepting drones is non-kinetic energy jamming system, commonly known as radio frequency jamming system, which mainly uses radio frequency to interfere with and block the control and communication link or satellite communication link between the drone and the operator, so that the drone can not continue to fly to the target, either land, or start the "return to the starting point" mode to fly back.
I. Overview of UAV interference
Uav jamming technology is a kind of technical means for effective control and jamming of UAV system. With the wide application of UAV in civil and military fields, its security, privacy and confidentiality issues are becoming increasingly prominent, and the development and application of UAV jamming technology is particularly important. The main purpose of UAV jamming technology is to make the UAV lose control, positioning ability or communication ability through specific jamming equipment or methods, so as to prevent the normal flight of the UAV or perform tasks.
2. Principle of electromagnetic interference
Electromagnetic interference (EMI) is any electromagnetic phenomenon that degrades, impairs or hinders the performance of an electronic device. In UAV interference, electromagnetic interference mainly interferes with the control signal or communication signal of the UAV by transmitting electromagnetic waves in the same frequency band as the UAV communication, so that the UAV cannot receive instructions correctly or maintain communication stability. Electromagnetic interference can be continuous or intermittent, depending on the design and application scenario of the jamming equipment.
In addition, electronic decoy is also an important "soft kill" means against drones, that is, to send false signals or navigation links to attack drones, so as to mislead or control incoming drones. This paper will introduce the UAV jamming principle and electromagnetic jamming system.
3.GPS jamming mechanism
GPS (Global Positioning System) is a key technology used by drones for positioning and navigation. The GPS jamming mechanism transmits electromagnetic waves with a frequency similar to the GPS signal, so that the GPS signal received by the UAV is interfered with or obscured, resulting in a decrease in the positioning accuracy of the UAV or a complete loss of positioning capability. GPS jamming devices can target specific frequency bands or cover a wider range of frequency bands.
4. Signal shielding technology
Signal shielding technology is a kind of technology that blocks or weakens electromagnetic wave propagation by physical means. In UAV interference, signal shielding technology is mainly used to shield the control signal or communication signal of the UAV to prevent it from being received or transmitted normally. Common signal shielding methods include metal shielding materials, signal blockers, etc.
5. Optical interference method
The optical jamming method is implemented by affecting the vision system or optical sensor of the UAV. This kind of method mainly uses strong light sources, lasers and other equipment to interfere with the visual recognition system of the UAV, so that it can not normally identify the target or the environment. Optical interference methods are very effective in certain scenarios, such as at night or in low light conditions.
6. Composition of electromagnetic interference system
Electromagnetic interference system usually consists of interference source, transmitting antenna, control system and so on. The interference source is responsible for generating electromagnetic waves of specific frequency band and power. The transmitting antenna is responsible for radiating electromagnetic waves to the target area; The control system is responsible for controlling the working state of the interference source and adjusting the parameters. The entire system needs to be precisely designed and optimized to ensure maximum interference effects.
At present, the control of the UAV mostly uses radio communication technology, by sending high-power interference signals to the target UAV, the control signal is suppressed, and the UAV can be forced to land or return by itself.
7. Working principle of electromagnetic interference system
The working principle of the electromagnetic interference system is to adjust the working parameters of the interference source through the control system to generate electromagnetic waves targeting the communication or control frequency band of the UAV. These electromagnetic waves radiate to the target area through the transmitting antenna and interact with the receiving equipment of the UAV, resulting in the UAV being unable to receive or process the command signal correctly. At the same time, through the combination of signal shielding technology and optical jamming method, the jamming effect can be further improved.
To sum up, UAV jamming principle and electromagnetic jamming system is a complex system involving knowledge in many fields. With the continuous progress of technology and the expansion of application scenarios, UAV jamming technology will continue to develop and improve, providing more effective technical means for UAV security management and privacy protection.
