With the widespread popularity of drones, countries are taking countermeasures, using their anti-drone technology to design and produce the drone jammer or drone gun jammer. These countries believe that these devices will be used to counteract the activities of drones.
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.
Radio hijacking Now, 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 Hobbyists can also 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 overwrite the signal of the real remote control, so as to gain control of the drone.
Hacking technology Many drones directly use Wi-Fi to interact with mobile devices such as mobile phones and tablets for the convenience of users. In this way, some hacking techniques that are already mature in the Internet can be directly applied to drones.
Professionals engaged in anti-drone applications in the industry said that the current domestic drone jammer technology is still in the exploratory stage, and the radio hijacking technology is difficult to achieve due to the encryption processing of radio signals by various drone manufacturers, and hacking technology. Due to the high threshold and difficult commercialization, the currently used technology is mainly based on interference blocking.
