With the development of science and technology, the emergence of intelligent technology. UAVs gradually appear in people's daily life. As a high-tech product, the use of UAVs for aerial photography and transportation of important materials in disaster areas has gradually become popular among people. As the application of drones is becoming more and more common, its shortcomings are gradually exposed. The wanton flying of drones and illegal shooting have seriously affected the development of social order and the security of residents' privacy. The emergence of the drone jammer countermeasure system is to indirectly make the drone fly according to the regulations. If the drone does not sail according to the regulations and illegally breaks into the no-fly zone, the signal used by the drone will be blocked by the drone jammer counter system, which is also a means of countering the drone .
The UAV jammer countermeasure system has an electromagnetic induction device. If the induction device is turned on, the electromagnetic waves generated will interfere with the normal working mode of the UAV, which not only affects the transmission of UAV data signals, but also can Cut off the connection with the satellite navigation system, so that the drone can only choose to land or return.
The existence of the drone jammer countermeasure system ensures the safety of some government agencies and confidential units, prevents the leakage of some confidential documents, and makes the drone countermeasure system attract widespread attention. Judging from the current usage, the UAV jammer countermeasure system uses suppressive interference to the signal of the UAV that caused the accident, and the countermeasure effect is obvious, and it also plays an important role in public places.
operation process;
When all switches are turned on, the UAV will be forced to land, and when the GPS is turned off and 2.4G/5.8G/900M is turned on, the UAV will lose control, and the UAV will return. When 2.4G/5.8G/900M is turned off and GPS is turned on, the UAV loses its positioning, and at this time the UAV can be controlled by remote control.
Specifically for visible drone interference, the effective distance is about 100 meters from the pilot to the drone, and the interference is more than 800-1500 meters.
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Wireless communication must ensure sufficient carrier-to-interference ratio (signal-to-noise ratio) in order to receive effectively and complete communication. The communication signal jammer is to destroy the receiving condition of the UAV by generating an interference signal with the same frequency as that received by the UAV, and cut off the communication connection between the UAV and the remote control transmission. To achieve the effect of interfering with communication.
The interference power is constant, and the shielding radius of the unobstructed space is determined by the path attenuation and control of the remote control transmission signal.
The signal level is jointly determined. The following table gives the comparison table of distance and path attenuation. Then the coverage radius can be determined by the output channel power of the jammer, the level of the remote control signal, and the gain of the coverage line.