Principle of drone jammer

Composition and principle of drone jammer

The device consists of a handheld host and a battery pack. The handheld host is an integrated design of the three-band transmitter antenna, which can simultaneously generate 2.4GHz/5.8GHz frequency band UAV flight control interference signals and satellite positioning interference signals, through the uplink flight control channel and satellite positioning channel of the UAV. Blocking interference, so that it loses flight control instructions and satellite positioning information, making it unable to fly normally. Depending on the design of the drone, it will produce control effects such as return, landing, and falling.

signal interference

At present, radio communication technology is mostly used for the control of UAVs. By transmitting high-power interference signals to target UAVs and suppressing the control signals, UAVs can be forced to land or return by themselves.

The United States took advantage of this principle. This gun installs a drone jammer on the frame of the rifle. Once the trigger is pulled, the jammer will send a full-band jamming signal to the drone, making the drone out of the operator's control and unable to receive control signal and automatically descend to the ground.

Once a drone's signal is in disarray, it usually has 3 options: drop to the ground, return to the operator, or descend smoothly. The effective range of this rifle has reached 500-2000 meters.

gps spoofing

At present, under normal circumstances, most consumer drones will prefer GPS navigation for flight control, while civilian GPS signals are unencrypted, which leaves usable space.

The main principle of GPS spoofing is to send false geographic location coordinates to the drone's control system, thereby controlling the navigation system and inducing the drone to fly to the wrong location. GPS signals can be generated by a generator, or they can be pre-recorded and played back. Since the GPS signal received by the UAV 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 UAV. GPS receiving module.

At present, various countries have set up no-fly zones in the core areas. Many drone manufacturers have set them in the built-in firmware of the drones. In the no-fly zone, the drone cannot take off. automatic landing. So, as long as the artificial GPS signal on the ground simulates the geographic location as the coordinates of the no-fly zone, it can force the drone to land on its own.

radio hijacking

Now, most of the control signals used by UAVs are in 1.2GHz, 2.4GHz, 5.8GHz and other conventional civilian frequency bands. With the rapid development of open source hardware such as Arduino and Raspberry Pi and the popularity of software radio (SDR) technology, ordinary enthusiasts You 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

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 well-established on the Internet can be directly applied to drones.

For example, through open ports or password guessing in the UAV control system, access to the control system to control the UAV. The legendary hacker Samy Kamkar (Samy Kamkar) who developed the "Sami Worm" used this principle to write a drone hijacking software called "SkyJack", and installed the software on a specially configured drone. In the drone, SkyJack flies in the air and looks for other drones within Wi-Fi range, then hacks the drone and takes control.

There are many types of drone jammer. main have 2 types: portable drone jammer, stationary drone jammer. for the portable jammer, we main have gun shape drone jammer and suitcase drone jammer. the jamming range usually can come 1000 to 1500 meter.