{"id":4118,"date":"2019-06-13T22:51:05","date_gmt":"2019-06-13T14:51:05","guid":{"rendered":"https:\/\/www.uavfordrone.com\/?p=4118"},"modified":"2021-04-22T16:47:54","modified_gmt":"2021-04-22T08:47:54","slug":"different-drone-jammer-uav-blocker-anti-drone-radio-frequencys-way","status":"publish","type":"post","link":"https:\/\/www.uavfordrone.com\/different-drone-jammer-uav-blocker-anti-drone-radio-frequencys-way\/","title":{"rendered":"Different Drone Jammer UAV Blocker Anti-Drone Radio Frequencys Way"},"content":{"rendered":"\n

In recent years, UAV drone technology has become more and more mature. At the same time as the application is more and more extensive, the control accidents and related safety problems caused by UAVs are becoming more and more normal. The UAV have many beneficial application prospects. It may also be used more and more maliciously.Due to the complex environment, electromagnetic environment, meteorological environment and traffic environment around important facilities and large-scale activities, the task of preventing and handling drone targets and terrorist attacks based on multi-rotor drones is prevented. It will be very difficult.
    On the whole, illegal drones may pose a potential and realistic threat to maintaining public safety and normal production and living order, and are mainly divided into three aspects:<\/p>\n\n\n\n

  1. “Peeper” in the air
        The flying height of the drone surpasses most obstacles and can easily take pictures of the vital parts of the high wall compound. The drone has a relatively complete camera stabilization technology, flight recording system, and real-time image feedback system. It also has functions such as fixed-point cruise shooting, follow-up shooting, and surround shooting. It can be used for stealing activities without modification.<\/li><\/ol>\n\n\n\n
    \"\"<\/figure>\n\n\n\n
    1. Dangerous “transfer station”
           Due to the strict security of the ground around major events or important facilities, and the prevention and control measures in place, criminals may throw explosives, biological agents, radioactive substances or illegal propaganda into the field through drones. Using GPS navigation technology, even in the dark night, the drone can cross the target wall, fence, and accurately deliver the harmful items to the designated location without disturbing the guards and alarm equipment. The drone bomb against the Venezuelan president gave the community a great vigilance!<\/li><\/ol>\n\n\n\n
      \"\"<\/figure>\n\n\n\n

      3:Uncontrollable risk
      Some RC airplanes or aerial photography enthusiasts, even ordinary people, flew drones to the event site or over important areas for entertainment, curiosity or inadvertentness. In recent years, in some sensitive areas, such as civil aviation airports, prison terminals, and important materials. Warehouses, important organs, conference sites, etc., have caused chaos caused by the intrusion of micro-UAVs, and even caused major losses (such as the black fly problem in the air-conditioned airport banned areas in previous years).<\/p>\n\n\n\n

      At the same time, in addition to the risk that the drone illegally breaks into itself, in these critical places, the quality of the DIY drone itself and the reasons for the control may cause accidents such as air collision, falling, fire, explosion, etc., which will also constitute a great Hazard.
      Therefore, the prevention of such low-speed and small drones or the counter-system is also born.<\/p>\n\n\n\n

      \"\"<\/figure>\n\n\n\n

      Second:Main technical introduction of drone counter system<\/p>\n\n\n\n

      For the counter-systems of low-speed and small-sized drones, there are mainly two parts of detection and counter-measure. Among them, for detection, there are two types of technical systems: spectrum detection type and radar detection type. For counter-technology, the technical system is more, for example, suppressing interference type, deceiving interference type, physical destruction type, direct arrest type, and so on. However, regardless of the system, it will cover suppression and deception interference, because for low and slow small drones, the use of radio suppression and deception interference is the fastest, most efficient and lowest cost technology. A brief introduction to the various techniques described above will be given below.
      Pressed radio interference
          As mentioned above, for “low and small” drones, suppressed radio interference is perhaps the most direct and effective and lowest cost counter method. The suppression counter-action is actually the radio suppression interference on the remote control link, information transmission link and GPS navigation signal of the illegal drone, so that the illegal drone becomes a scorpion, a scorpion and a dumb in a certain area. Even if there is a drone’s inertial function, it can only maintain the original posture for a short time, and cannot continue to exercise according to the desire of the controller.<\/p>\n\n\n\n

      \"UAV<\/figure>\n\n\n\n

      Generally speaking, the wireless data link of consumer low-speed and small drones has about 2-3 commonly used frequency bands, namely 2.4GHZ, 5.8GHz and 915MHZ, which are often the main consumers of consumer illegal drones. Frequency band. For professional drones, the professional frequency bands for the UAV data link specified by the Ministry of Industry and Information Technology of China are 845 MHz and 1.4 GHz. Generally speaking, because the professional drones in our country are often used by government departments or even law enforcement agencies, they are in a strictly controlled state, and the probability of illegal use is very low, coupled with the low output of wireless data link products in these two dedicated frequency bands. The price is high, and the general consumer drones rarely use these two frequency bands. Therefore, the general counter-interference devices are mainly concentrated in the three bands of 2.4 GHz, 5.8 GHz and 915 MHZ.<\/p>\n\n\n\n

      \"\"<\/figure>\n\n\n\n

      In addition to the wireless data link, the drone has an important frequency point, which is the “satellite navigation signal frequency point” for navigation! At present, there are three types of satellite navigation systems commonly used by drones, namely, the US GPS, the Russian GLONASS, and the Chinese BD. Most of the current satellite navigation chips are compatible with these three systems, and the mainstream chip technology is a fusion algorithm using two or all of these three systems. The frequency of these three systems is as follows:<\/p>\n\n\n\n

      \"\"<\/figure>\n\n\n\n

      GLONASS frequency :<\/p>\n\n\n\n

      \"\"<\/figure>\n\n\n\n

      In principle, as long as the amplitude of the radio suppression signal is strong enough and the frequency can cover the satellite navigation frequency above, the drone will lose the ability to auto-navigate.
      \n    It can be seen from the above analysis that there is no technical difficulty in suppressing the counter-type drone, because the frequency of the communication data link and the navigation signal are all public, as long as a noise signal with the same frequency and sufficient amplitude is produced. , can all have the effect of suppression. Simply put, this counter-measure is the simplest, rude and unskilled solution! But this solution is simple but effective.
      \n    Of course, in addition to the low-speed and small-sized systems of the consumer category, for some professional UAVs, even military UAVs, this simple suppression method is also effective, but the requirements for the transmission power are even higher. I will not discuss it for the time being.<\/p>\n\n\n\n

      1. Deceptive UAV interference system
            Compared to a simple suppression interference system, a deceptive or inductive counter system has a higher technical content. Deceptive counteraction consists of two parts: data link spoofing and navigation signal spoofing.
            Data chain spoofing is more difficult. First, we must implement the data chain of the target drone and analyze it. If we can crack all the parameters of the entire data link, such as frequency, bandwidth, modulation mode and communication protocol, This means that we can achieve complete takeover of illegally invaded drones! This work is more difficult, and it is quite difficult for frequency hopping communication and data chain with different encryption and decryption technologies! If the anti-system based on data link cracking technology is implemented for all kinds of drones known on the market, the workload and difficulty are almost impossible. Even if it is aimed at the successful cracking of a certain drone, if the manufacturer adjusts the technical system and encryption method of the data link, all the work must be repeated again! The counter-system based on the data link cracking technology is often adopted by the military, that is, a certain type of military drone in the local area is researched and cracked, and taken over. Iran has repeatedly captured the US military’s RQ47 drone, which is the technical route.<\/li><\/ol>\n\n\n\n

        Deception of satellite navigation signals is interference, mainly for GPS\/GLONASS\/BD navigation systems, transmitting false satellite navigation signals. If the false satellite navigation signal power is much higher than the real GPS navigation signal, then the drone will fly according to the false navigation signal until it flies out of the protected area and land or crash on its own to achieve critical areas. The purpose of the protection. The frequency and format of the navigation signal are relatively fixed, even transparent. Therefore, the counter-production implemented by transmitting the false satellite navigation signal is simpler than the data link tube technology. If the false navigation signal can be used to induce and land the illegal drone and capture it perfectly, it will be more effective for future case investigation and evidence collection. This technical system is more technical than violently interfering with drones and making them fall and crash.
        \n    Of course, the best technical solution is that it can take over the data link and release false navigation signals. It provides evidence for the perfect capture of the drone without solving the problem! However, in the civilian sector, the economics of various counter-measures are also very important. If you spend a lot of manpower and material resources, just for a few thousand yuan or tens of thousands of “low and small”, it seems not worth it; And if it is the perfect capture of a US RQ47 (to Iran), or the Israeli heron series, the significance is very significant.<\/p>\n\n\n\n

        1. Physical counter
              The physical counter-system, to put it bluntly, is to directly destroy or arrest!
              For the drone counter-country between the state and the hostile country, if the other party invades the airspace, the invaded party has the power to condemn it, and has the right to force a shot down, such as direct missile shooting down.
              For “low and slow”, it is not worthwhile to shoot down with a missile! At home and abroad, many experiments using laser shot down have been reported. The author believes that laser shot down will be an important development direction.<\/li><\/ol>\n\n\n\n

          Fourth, the automatic anti-system combination of drones
              The drone automatic counter system is crucial for important places and important conference security. However, how the UAV counter system can really play a role is a topic that needs to be seriously explored and should be targeted at different application scenarios, such as different Occasionally and different intrusion objects, do different configurations.
              One is for the security guards on the site of some temporary commercial conferences. In the case of aeronautical amateurs, simply configure an interfering counter-gun, which can be manually guarded by a gunman. This is because, on the one hand, the meeting time will not be too long, and amateur aerial photography enthusiasts generally belong to non-malicious intrusions, nothing more than curiosity, showing off the heart, and will not lead to serious consequences.
              The second category is for the on-site security of senior leaders, it is necessary to configure a highly reliable, mobile-armed drone anti-system to ensure that nothing is lost. Such systems must have automatic detection, automatic alarm and automatic counter-attack capabilities.
              The third category is for fixed important places, such as important state agencies, important warehouses (grain stores, oil depots, ammunition depots, etc.), important prisons, etc., due to the need for long-term prevention, they must be equipped with fixed full A fully automatic counter-system for the detection, alarm and counter-integration of unmanned aerial vehicles.
              The fully automatic UAV counter system should include all systems for fully automatic detection, fully automatic alarm and fully automatic disposal. After the automatic detection system (radar and spectrum) finds the target, the sound and light alarm is immediately given to the on-duty personnel, and the anti-interference system (repressive and deceptive) antenna in the hot backup is aimed at the target. Two choices, one is that after the antenna is aimed at the target, the interference device is automatically turned on immediately, and the data link of the illegal drone and the satellite navigation signal are subjected to interference (pressing or deceptive), and the illegal drone is directly protected. A forced landing or crash outside the area.
              Another option is to increase the number of human judgments, through optical or thermal imaging cameras, after the duty officer observes and confirms the target, and then turns on interference suppression.
              The last option is to take the forensic drone to the target and take evidence for it. Try to find evidence of the illegal controller by taking pictures of the ground (the drone model of the forced landing or crash, the picture of the controller, etc.) .
          In short, the evaluation of such systems should focus on the four aspects of \u201csystem reliability, high intelligence, effective counter-action, and high success rate of evidence collection\u201d.<\/p>\n\n\n\n

          Sixth, the precautions for the selection of the drone counter system<\/p>\n\n\n\n

          1. Reasonable selection of detection distance and interference distance
            \n    Among these basic parameters, the “interference suppression distance” can be increased in principle by increasing the transmission power, but this may cause other problems, namely electromagnetic pollution. Especially for GPS\/BD interference, it will affect the rights of normal GPS users around, such as mobile phone base stations, and even airport navigation in the distance. At present, there is no clear quality standard or regulation for the output power of UAV counters in our country. Many manufacturers arbitrarily increase the transmission power from the perspective of the effectiveness of the counter, which is unscientific. It is recommended that the counter manufacturer should reduce the transmit power as much as possible, and increase the gain of the transmit antenna so that the energy is more concentrated on the target to increase the range. It should be avoided to use omnidirectional antenna radiation and arbitrarily increase the power. In this regard, it is necessary to establish relevant technical standards.
            \n    For the “low slow and small” detection radar range, it should also be adapted to local conditions, should not “kill the chicken with a knife”, arbitrarily choose high-power radar, it will also cause environmental pollution. For example, a protection zone of 500m\u00d7500m is sufficient for a system with a working distance and a interference distance greater than 1000 m. It is not necessary to configure a counter system with a distance of more than 2 KM. In theory, if the distance of the jammer is doubled, the transmit power must be increased by 4 times. High power and increased cost, but also increased pollution to the surrounding environment!<\/li>
          2. Reasonable choice of detection system
            \n    The principles of different detection systems have been introduced above. According to the working principle, the actual use environment and the object of prevention, we can basically make a reasonable choice:
            \n1) For example, our precautionary target is a conventional RC model similar to DJI. The precautionary area is a concert in a stadium in the city. In this case, it is enough to have a few counter-guns.
            \n2) If it is an important place, such as a prison, oil depot or ammunition and hazardous warehouse, it needs 24-hour alert, you need to configure a fully automatic counter system with radar detection technology (which should not use spectrum detection). It is sufficient that the equipment has a working distance of about 1 km (in the urban environment, due to the influence of the building on the terrain, the distance cannot be effective).
            \n3) For the prevention of important targets in remote areas, spectrum detection (radiation type and scattering type) can be purchased, plus a fully automatic interference system. The working distance is as far as possible, such as the working distance of 3-5KM or more. In the open area, the advantage of far-reaching spectrum detection can be exerted.
            \n4) For the drone harassment of hostile countries in the border areas, in order not to cause diplomatic disputes, the best solution is to induce the other party’s drones to be forced into the territory of China through technical means such as spectrum detection and cracking.
            \n5) If it is against the security of the important leader’s drone, the counter target is \u201cblack drone drone\u201d, it is recommended to choose automatic radar detection, interference, and configure an effective physical destruction device! Make sure nothing is wrong.
            \nNote that in this application, it is recommended not to use spectrum-based detection equipment, because terrorists will never let you know the spectrum parameters of his drone in advance and enter the database!
            \n6) For the drone harassment of hostile countries in the border areas, in order not to cause diplomatic disputes, the best solution is to induce the other party’s drones to be forced into the territory of China through technical means such as spectrum detection and<\/li><\/ol>\n","protected":false},"excerpt":{"rendered":"

            In recent years, UAV drone technology has become more and more mature. At the same time as the application is more and more extensive, the control accidents and related safety problems caused by UAVs are becoming more and more normal. The UAV have many beneficial application prospects. It may also be used more and more<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[509],"tags":[],"yoast_head":"\nDifferent Drone Jammer UAV Blocker Anti-Drone Radio Frequencys Way<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.uavfordrone.com\/different-drone-jammer-uav-blocker-anti-drone-radio-frequencys-way\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Different Drone Jammer UAV Blocker Anti-Drone Radio Frequencys Way\" \/>\n<meta property=\"og:description\" content=\"In recent years, UAV drone technology has become more and more mature. 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