At present, the mainstream means of intercepting drones is a non-kinetic jamming system, commonly known as a radio frequency jamming system. It mainly uses radio frequencies to interfere with and block the control and communication links or satellite communication links between the drone and the operator, so that The drone cannot continue flying to the target and must either land or start the "return to starting point" mode and fly back. signal jammerA variety of different models of non-kinetic jamming systems have been developed at home and abroad, with maximum effective distances ranging from hundreds of meters to tens of thousands of meters. In addition, electronic deception is also an important "soft kill" method against drones, which is to send false signals or navigation links to incoming drones to mislead or control the incoming drones. This article will introduce the principle of UAV interference and electromagnetic interference system.At present, radio communication technology is mostly used to control UAVs. By transmitting high-power interference signals to the target UAV and suppressing the control signals, the UAV can be forced to land or return on its own.The United States has taken advantage of this principle. This gun installs an electronic jammer on the frame of the rifle. Once the trigger is pulled, the jammer will transmit a full-band jamming signal to the drone, causing the drone to escape from the operator's control and fail to receive the control signal. Automatically land to the ground.Once a drone's signal is confused, it usually has three options: drop to the ground, return to the operator, or descend smoothly. The effective range of this rifle reaches 500 to 2000 meters.1. Principle of drone interferenceDrone interference is mainly divided into two types: electromagnetic interference and GPS interference.1. Electromagnetic interferenceElectromagnetic interference refers to the interaction between electromagnetic waves emitted by drones and electromagnetic waves generated by other electromagnetic equipment, causing other electromagnetic equipment to fail to work properly. The electromagnetic waves emitted by drones mainly come from the following aspects:(1) Remote control: The remote control is the control center of the drone. The electromagnetic waves it emits will interfere with other nearby electromagnetic equipment.(2) Image transmission: Image transmission is a device used to transmit images and videos captured by drones. The electromagnetic waves it emits will also interfere with other electromagnetic equipment.(3) GPS: GPS is a key equipment for drone navigation, but its electromagnetic waves can also interfere with other electromagnetic equipment.2. GPS interferenceGPS interference means that the signal emitted by the drone interferes with the GPS signal, causing the GPS to not work properly. The signals emitted by drones mainly come from the following aspects:(1) Remote control: The signal emitted by the remote control will interfere with the GPS signal.(2) Image transmission: The signal emitted by image transmission will also interfere with the GPS signal.(3) Radio: Signals emitted by radio can also interfere with GPS signals.2. Introduction to electromagnetic interference systemIn order to solve the problem of drone interference, electromagnetic interference systems have been developed. The electromagnetic interference system is a device that interferes with the drone by emitting electromagnetic waves, causing the drone to lose control or become disoriented.The main components of the electromagnetic interference system include antennas, power amplifiers, signal generators and control systems.1. AntennaThe antenna is the core component of the electromagnetic interference system, which is responsible for emitting electromagnetic waves. The design of the antenna determines the frequency and power of electromagnetic waves, so the performance of the antenna has a great impact on the effectiveness of the electromagnetic interference system.2. Power amplifierThe power amplifier is another important component of the electromagnetic interference system. It is responsible for amplifying the signal generated by the signal generator to sufficient power to ensure that the electromagnetic wave can achieve the expected interference effect.3. Signal generatorThe signal generator is the control center of the electromagnetic interference system and is responsible for generating interference signals. The design of the signal generator determines the frequency and shape of the interference signal, so the performance of the signal generator also has a great impact on the effectiveness of the electromagnetic interference system.4. Control systemThe control system is responsible for controlling the operation of the electromagnetic interference system. It can change the frequency and shape of the interference signal by adjusting the parameters of the signal generator to achieve the best interference effect. The control system can also monitor interference effects in real time and adjust parameters in a timely manner.3. SummaryThe problem of drone interference is an important issue that needs to be solved in the development of drone technology. The electromagnetic interference system is an effective means to solve the problem of drone interference. It can interfere with the drone's equipment by emitting electromagnetic waves, causing the drone to lose control or lose its direction. As drone technology continues to develop, electromagnetic interference systems will continue to be improved to meet the needs of different application scenarios.