On May 6, the Yihang drone issued a statement saying that the previous drone performance accident was caused by the interference of the positioning system.
“After the performance, the company immediately convened industry experts to analyze the data of 496 affected drones. The background data showed that on the night of the performance on May 1st, the drone equipment, communication system and flight system were normal, but some of them were unmanned. The positioning and auxiliary positioning system of the machine is subject to directional interference after take-off, resulting in abnormal data of its position and height." This is the specific reply given by the Yihang drone.
According to the original plan, on May 1st, Yihang should synthesize 1374 unmanned units into a variety of patterns and texts in the performance of "Spring Dance Da Xi'an", and then add lighting effects to present dynamic effects such as rolling subtitles. After all of this is completed, it will receive a performance fee of 10.5 million.
It stands to reason that based on the "performance experience" before the billion airlines, this 10.5 million is not difficult to take, and the night before the performance, the thousands of drones of Yihang also successfully completed the last rehearsal, and even passed Guinness World Records certification. However, at the crucial moment, Yihang Airlines “dropped the chainâ€. In the official performance, the drone group on the left side was basically "smashed". Almost no drone arrived at the designated position, but was hovering in the air, and was nicknamed "garbled" by netizens.
In this regard, Yihang investigation said that after the take-off of their drones, the positioning and auxiliary positioning system was subjected to directional interference.
UAVs that can be interfered in many ways, sometimes "heart-tired"When it comes to interference, it can be generally divided into natural factors and human factors. In terms of natural factors, magnetic field changes are the most common. For example, Zhongfei Aiwei, who specializes in the development of power line UAVs, founder and CEO Cao Fei said that they will install shielding devices for important components of drones. Or directly use anti-electromagnetic interference components to make drones.
In terms of human factors, the most typical ones are those anti-black-flying counter-products that generally interfere with drones through signal interference, sonic interference, and radio hijacking.
Signal interference, such as GPS interference, releases a certain amount of directional radio frequency to the drone, so that the drone equipped with the GPS positioning system cannot know the precise coordinate data, so that it can only hover in the air and float with the wind;
Acoustic interference——The main attack object is the gyroscope mounted on the drone. When the acoustic frequency is consistent with its natural frequency, resonance will occur between the two sides, which will affect the normal operation of the gyroscope, resulting in flight disorder of the drone. If it does, it may cause the drone to crash;
Radio hijacking - By interfering with the radio frequency between the drone and the flying hand, gain control of the drone, causing it to fall, fall directly, or return on its own.
At the same time, it is worth noting that, from the perspective of a certain treasure and an East platform, perhaps the price of some UAV jammers is a bit high. However, Sun Yi, chief test pilot of the Beijing University of Aeronautics and Astronautics, said: "Some equipment sold online is easy to modify or assemble signal jammers. Some people who know the technology can also make their own. The cost is not high. Yuan or 10,000 yuan. Because everyone knows the frequency band of GPS, it is enough to suppress the frequency at the frequency to make the drone not receive the signal."
From this point of view, if you have a heart to interfere with the drone, sometimes it is really "simple". But for "legal flying drones", this should not be a good news.
"Anti-interference ability" is the life of military drones, not to mention civilian drones?
In this regard, we can look at the performance of military drones.
As we all know, compared with civilian equipment, military equipment is more powerful in terms of technology and so on, as is the drone market. However, just a few years ago, the US RAND Corporation had conducted a comprehensive evaluation of the operational use of the drone, pointing out that the anti-jamming capability was a major fate in the UAV combat process. In the near future, some people in the US military also said that most of the drones they sent out during the flight were crashed due to interference from the Russian military's GPS signals.
Of course, this situation has found a solution, such as the use of "multi-mode" approach - while receiving GPS, Beidou, GLONASS signal, when a satellite signal is not good, the system can automatically switch to other navigation system.
However, it should be noted that in the civilian market, drones that can simultaneously carry three navigation systems are still quite rare. Sun Yi also pointed out that civilian drones are generally only GPS-based for navigation at the current cost and load capacity, and are currently being replaced.
It can be said that in the face of counter-production equipment, the "anti-interference ability" of most military drones is still open to question, let alone the drones in the civilian market.
According to industry insiders, from the current point of view, human interference means represented by interference equipment cannot be prevented by technical means. However, although the prevention aspect is still not in place, the UAV can be said to be small and fruitful in terms of the overall "anti-interference" capability. It is understood that the company has been engaged in the development of GPS receivers, interference and modules, which can prevent the GPS signal of the drone from being interfered and deceived, and successfully carried out the airborne test of the drone.
At lastBecause of the shackles of the black flying drone, the “anti-black flying†market gradually started and got on the right track. According to the "anti-UAV market report" released by Markets & Markets, a foreign market research institute, analysts predict that the anti-UAV market will grow at a rate of about 24% per year between 2017 and 2022, by 2022. The total market will reach $1.14 billion.
However, in special applications such as military and performance, the means of interference to resist the black-flying drone is necessary, but, in contrast, for those "legal flying drones," how to " Avoiding interference is also a problem that needs to be focused on.
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