The military's drones and a large number of civilian drones "black flight" have made drone countermeasures technology more developed. What are some common UAV countermeasures systems, what are the specific countermeasures for these systems, and what are their advantages and disadvantages? Today let Li Zheng technology for everyone to introduce.

　　Common drone countermeasures

　　Suppression radio interference

　　Suppression radio jamming is perhaps the most direct and cost-effective form of countermeasure. Suppression countermeasures are actually radio suppression interference for the remote control link, information transmission link and GPS navigation signal of illegal drones, so that illegal drones become blind, deaf and mute in a certain area. Even if it has the role of UAV inertial navigation, it can only maintain the original attitude for a short time and cannot continue to move according to the wishes of the operator.

　　Spoofing UAV jamming system

　　Compared with the simple suppression jamming countermeasure system, the deception or inducement countermeasure system has a higher technical content. The spoofing countermeasure consists of two parts: data link spoofing and navigation signal spoofing. Of course, the best technical solution is to take over the data link and release false navigation signals, which provides evidence for the perfect arrest of the drone and does not solve the case!

　　Drone countermeasure system

　　Physical countermeasures

　　A physical countermeasure system, to put it bluntly, is to kill or capture directly! Applicable to drone countermeasures between states and hostile states. But for "low, slow and small" drones, it is best to use larger drones to catch smaller drones. Specific countermeasures and advantages and disadvantages of UAV countermeasures system

　　Physical capture

　　At present, physical capture commonly used at home and abroad is mainly divided into two categories. One is the method of using larger UAVs to confront small UAVs, which can capture and transfer small UAVs to safe areas during flight by using larger UAVs firepower or high-pressure pneumatic jet capture nets. It is also possible to use a larger drone to tow a flat capturing net with a larger cross-section area (5-10 square meters) to "adhere" to the form of the target drone during flight; This kind of physical capture method has the advantages of low economic cost, good safety performance, little damage to the captured UAV, and basically does not affect the normal use of the captured target, but its disadvantage is that it has higher requirements on the flight parameters, stability and flight skills of the pilot of the larger UAV, and the success rate in practice is not high. Another kind of physical capture method is to directly control small UAVs by domesticating large raptors such as hawks and falcons during flight. This method has low cost, but the training is difficult and the period is long.

　　Drone countermeasure

　　Uav confrontation is the most direct countermeasure method, which directly intercepts or impacts the target UAV in a self-injury-like way, and injury-destroys or destroys the target UAV to make it land. The application scenario of this method is an emergency measure chosen under the premise that other methods are inconvenient or cannot be used. Generally, it can only be operated within the visual range to exclude more urgent dangers. The use of direct confrontation requires the operator to have good technical skills, the need to choose the right airspace to prevent damage to ground personnel and facilities, and this approach is less effective when dealing with multiple unmanned aerial vehicles that need to be confronted.

　　Laser weapon

　　Laser weapons mainly use high-energy laser beams to carry out fast and efficient precision strikes on long-range targets, and the application is also feasible in attacking drones. The laser weapon has a long range, high energy and high power, and can achieve instant damage or destruction once it is aimed at the target. Laser weapons can use ground-based methods and vehicle-mounted methods to achieve the attack on drone targets, supporting drone search and positioning equipment, which can quickly track the target, and then achieve the target injury or destruction. The disadvantages of using laser weapons are expensive, affected by weather and environment, and certain difficulties in timely and accurate positioning and aiming of targets.

　　Fire interception

　　In practice, fire weapons can be used to attack UAVs. Rockets, ground-based light missiles and air-to-air light missiles can achieve devastating strikes on target UAVs. Generally, this method can be used to implement emergency countermeasures and strikes on important suspicious UAVs in the peripheral areas of important large-scale event security and government head escort scenes. However, this method of interception and attack is expensive and has security risks to ground targets, so it should be used with caution in non-emergency situations.

　　Electromagnetic interference

　　At present, the communication frequency bands used by most UAs are 2.4GHZ and 5.8GHZ. According to the frequency band characteristics of this electromagnetic signal, high-power electronic jamming devices (mostly in the form of rifles) can be used to directly suppress and interfere with the uplink and downlink communication signals between the UAS and the ground remote control. Furthermore, the image transmission and data transmission signals of the UAV are weakened or even lost, forcing the UAV to automatically return or land in place. In view of the high safety performance and low cost of this method, it has been widely used at present.

　　Drone countermeasure system

　　Decoy guidance

　　Based on the positioning principle and function of GPS, the vast majority of UAVs rely on GPS data information to locate the take-off point, set the flight trajectory and help improve the stability of the flight. If the use of technical means in the appropriate area to artificially change and adjust the GPS data so that the UAV receives the artificially set GPS data, it can induce the UAV to return to the desired location or change its pre-set flight path, which is currently feasible.

　　Acoustic interference

　　In theory, as long as the decibel number of the sound wave is large enough, the unmanned gyroscope system can produce wrong judgment and then make the UAV land or crash, but this method is only suitable for the attack in the near range. Meanwhile, this method is still in the research stage, and the application effect needs to be further improved.

　　Microwave interference

　　Microwave interference is the use of high-energy electromagnetic radiation to injure or destroy the target UAV, theoretically speaking, microwave interference is better than electromagnetic interference because of its limited conditions, and the strike distance is far, this method is currently being applied