What are the ways to jam drones? See how drones can be used for traffic management!
Several ways to interfere with drones
1. UAVs signal jammer
At present, the control of UAVs mostly uses radio communication technology. By transmitting high-power jamming signals to the target UAVs and suppressing the control signals, the UAVs can be forced to land or return by themselves. The United States uses this principle. This drone jaming shield has an electronic jammer installed inside. Once the power switch is turned on, the high-power signal jammer will send a full-band jamming signal to the drone, so that the drone is out of the controlof the operator and cannot receive the control signal. Automatically land on the ground. Once the drone's signal is messed up, it usually has 3 options: fall to the ground, return to the operator, or descend smoothly. This rifle has an effective range of 500 to 2000 meters.
2. GPS jamming and spoofing
At present, under normal circumstances, most consumer drones prefer GPS navigation for flight control, while civilian GPS signals are unencrypted, which leaves room for use. The main principle of GPS spoofing is to send false geographic coordinates to the control system of the drone, thereby controlling the navigation system and inducing the drone to fly to the wrong place. The GPS signal can be generated by a generator, or it can be pre-recorded and then replayed. Since the GPS signal received by the drone is always based on the signal source with the strongest signal, as long as the artificial GPS signal on the ground is strong enough, it can cover the real GPS signal from space, thereby deceiving the drone. GPS receiver module.
At present, various countries have set up no-fly zones in core areas, and many drone manufacturers have set them in the built-in firmware of drones. In the no-fly zone, the drone cannot take off, even if it reaches the no-fly zone. Automatic landing. So, as long as a man-made GPS signal on the ground simulates the geographic location as the coordinates of a no-fly zone, the drone can be forced to land on its own.
3. Radio Hijacking
At present, most of the control signals used by drones are in conventional civilian frequency bands such as 1.2GHz, 2.4GHz, and 5.8GHz. With the rapid development of open source hardware such as Arduino and Raspberry Pi and the popularity of software-defined radio (SDR) technology, ordinary enthusiasts It is also possible to use the hardware purchased from the Internet and the software source code obtained from the forum to simulate the remote control to send control signals to the drone, and overlay the signal of the real remote control, so as to obtain the control of the drone.
2. The application of UAV in traffic management
There are many forecasts for the drone industry, some for hardware sales, some for the software and services market, and some for a specific area. While the numbers vary, they all demonstrate the same phenomenon: the drone industry has grown.
There are three main roles of drones in traffic management:
1. Aerial photography of the accident scene to achieve picture restoration.
Traffic control can use the drone to obtain an intuitive picture, so as to accurately grasp the last position of the vehicle involved, restore the scene of the traffic accident more quickly, and provide data support for the determination of responsibility for the accident.
2. Evacuate the road and quickly remove the blockage.
When a highway is congested or a major accident occurs, the stranded vehicles may be as long as several kilometers, and it is difficult for manpower to reach the core area in a short time to find the problem, but drones can quickly collect complete on-site information, identify congestion points, and promote Development of dredging work. For example, during the Golden Week in October this year, a traffic accident occurred on a highway in Wuhan, causing vehicles to be stranded for nearly two kilometers. With the assistance of drones, the road was cleared within 20 minutes.
3. Traffic statistics, optimize traffic management.
UAVs can collect all-round high-altitude video of major intersections and important road sections, and save them for a long time for big data analysis, so that the traffic police department can make adjustments according to long-term traffic conditions, such as resetting the timing of traffic lights and improving traffic. efficiency.
According to media reports, traffic police departments in China's Chongzuo, Guangxi, Jing'an, Jiangxi, Wuhan, Hubei, Jinan, Shandong, Baoji, Shaanxi, and Shaoxing, Zhejiang have used drones to assist traffic management.