KR102231282B1 - wide bandwidth anti-drone jamming system and its method - Google Patents

Abstract

The present invention is a broadband anti-drone jamming system that generates a jamming signal by receiving only radio waves generated from a non-standard anti-drone to generate a jamming signal, and generates a jamming signal by separating the transmission signal from a non-standard anti-drone transmission signal and a non-standard anti-drone controller to increase the efficiency of jamming. And a method.
The broadband anti-drone jamming system of the present invention includes an antenna that transmits and receives radio waves, a radio wave receiver that receives radio waves from the antenna, a signal processor that analyzes a received signal from the radio wave receiver to perform signal processing, and a jamming signal generated by the signal processor. It consists of a radio wave transmission unit that transmits.

Description

Wide bandwidth anti-drone jamming system and its method

The present invention relates to a broadband anti-drone jamming system and method, and more particularly, to transmit a jamming signal to a non-standard anti-drone by analyzing a radio wave generated by a non-standard anti-drone in a broadband manner. That is, the present invention relates to a broadband anti-drone jamming system and method capable of neutralizing a non-standard anti-drone by transmitting a jamming signal to a non-standard anti-drone.

A drone, which is an unmanned aerial vehicle, is a vehicle that a pilot remotely controls from the ground without directly boarding the vehicle, and can float in the air by the rotation of a propeller, and can be flown by induction of radio waves. Drones are designed for easy remote control from a long distance, and with the development of wireless technology, drones, which are small flying objects for wireless reconnaissance owned by individuals, not for military use, are commercially available and used.

In recent years, drones are not simply used for military purposes, but are widely used throughout society, more people purchase drones as a personal hobby, and some companies are preparing unmanned delivery systems using drones. In addition, aerial photography using drones has already become common among broadcasters.

However, although drones can be controlled from a distance, they are equipped with high-performance cameras, so there is a possibility of invasion of privacy, such as shooting actions that the other party does not want. In particular, unauthorized reconnaissance, surveillance, attacks, terrorism, and invasion of privacy, etc. In view of the possibility of intrusion, there is a need for a method to neutralize the abused anti-drone.

As an example, in Korean Patent Publication No. 10-2018-0070585, a portable reverse detection device aimed at a rifle-type unmanned system that disturbs drone control by aiming at a drone, including a power supply, was studied.

However, this system has a disadvantage that it is difficult to detect and transmit jamming signals for drones using non-standard frequencies that do not use standard frequencies.

Korean Patent Publication No. 10-2018-0070585 (2018.06.26.)

An object of the present invention is to provide a broadband anti-drone jamming system and method for generating a jamming signal by receiving only radio waves generated from a non-standard anti-drone.

Another object of the present invention is to provide a broadband anti-drone jamming system and method for increasing the efficiency of jamming by generating a jamming signal by dividing a non-standard anti-drone transmission signal from a transmission signal of a non-standard anti-drone controller.

The broadband anti-drone jamming system according to the present invention includes an antenna for transmitting and receiving a radio wave, a radio wave receiving unit receiving radio waves from the antenna, a signal processing unit performing signal processing by analyzing a received signal of the radio wave receiving unit, and a jamming signal generated by the signal processing unit. It may include a radio wave transmitter for transmitting radio waves.

Here, the antenna may form at least one radiation pattern of directional or non-directional.

In addition, the antenna may have a directional or non-directional radiation pattern respectively or simultaneously according to a gain and a phase of the array antenna.

Here, the signal processor may control the radiation pattern of the antenna to extract the radiation frequency of the non-standard anti-drone among the received signals.

In addition, the signal processing unit may extract a distance from a non-standard anti-drone by controlling the radiation pattern of the antenna.

Here, the signal processing unit may determine a signal directly received from the antenna for at least two received signals as a transmission signal from the anti-drone, and determine a signal received as a reflection as a transmission signal from the anti-drone controller.

In addition, the signal processing unit may determine a relatively large signal as a transmission signal of the anti-drone and a relatively small signal as a transmission signal of the anti-drone controller with respect to the at least two received signals.

Here, the signal processing unit determines a signal that is inversely proportional to the distance from the anti-drone for at least two received signals as the transmission signal of the anti-drone, and a constant signal regardless of the distance from the anti-drone is determined as the transmission signal of the anti-drone controller. I can.

In addition, the signal processing unit may determine a signal having a relatively small time occupation for at least two received signals as a transmission signal of an anti-drone, and a signal having a relatively large time occupation as a transmission signal of an anti-drone controller.

Meanwhile, the signal processing unit may transmit an impulse signal to the anti-drone when there is no signal received from the anti-drone or the anti-drone controller.

Broadband anti-drone jamming method according to another embodiment of the present invention includes a radio wave receiving step of receiving a radio wave in a radio wave receiving unit, a signal processing step of analyzing a received signal of the radio wave receiving unit to perform signal processing, and a jamming signal generated by the signal processing unit. It may include a radio wave transmission step of transmitting a radio wave of.

The broadband anti-drone jamming system and method according to the present invention has an advantage of generating a jamming signal by receiving only radio waves generated from a non-standard anti-drone.

In addition, the broadband anti-drone jamming system and method according to the present invention has an advantage of increasing the efficiency of jamming by generating a jamming signal by dividing a non-standard anti-drone transmission signal from a transmission signal of a non-standard anti-drone controller.

1 is a block diagram showing a broadband anti-drone jamming system according to an embodiment of the present invention.
2 is a diagram showing in detail a radiation pattern of a transmission signal radiated from the antenna of FIG. 1.
3 is a diagram illustrating in detail an array antenna generating the radiation pattern of FIG. 2.
4 is a detailed signal waveform showing a difference in frequency characteristics of a received signal according to the antenna characteristics of FIG. 1.
5 is a detailed signal waveform showing a difference in received signal power according to the antenna characteristics of FIG. 1.
6 is a signal waveform detailing a difference in a reception path between an anti-drone transmission signal received from the antenna of FIG. 1 and a transmission signal of an anti-drone controller.
7 is a signal waveform detailing a difference in reception level between a transmission signal of an anti-drone and a transmission signal of an anti-drone controller received from the antenna of FIG. 1.
FIG. 8 is a detailed signal waveform showing a difference in a reception level change according to a distance of an anti-drone for an anti-drone transmission signal received from an antenna of FIG.
9 is a signal waveform detailing a difference in radio occupation time over time between a transmission signal of an anti-drone and a transmission signal of an anti-drone controller received from the antenna of FIG. 1.
10 is a detailed signal waveform showing an impulse signal transmitted from the antenna of FIG. 1.
11 is a flowchart illustrating a broadband anti-drone jamming method according to an embodiment of the present invention.

A specific embodiment for carrying out the present invention will be described with reference to the accompanying drawings.

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. This is not intended to limit the present invention to a specific embodiment, it can be understood to include all changes, equivalents, or substitutes included in the spirit and scope of the present invention.

Hereinafter, a broadband anti-drone jamming system and method according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a broadband anti-drone jamming system according to an embodiment of the present invention, and FIGS. 2 to 10 are detailed diagrams and signal waveforms for describing FIG. 1 in detail.

Hereinafter, a broadband anti-drone jamming system according to an embodiment of the present invention may be described with reference to FIGS. 1 to 10.

First, referring to FIG. 1, a broadband anti-drone jamming system according to an embodiment of the present invention includes an antenna 100 for transmitting and receiving a radio wave, a radio wave receiving unit 200 receiving a radio wave from the antenna 100, and a radio wave receiving unit 200. ). A signal processing unit 300 that analyzes the received signal and performs signal processing, and a radio wave transmission unit 400 that transmits a radio wave of the jamming signal generated by the signal processing unit 300.

In order to satisfy the characteristics of the broadband anti-drone jamming system, the antenna 100 has a structure capable of controlling directivity and omni-directionality, and through this, it is possible to accurately measure the frequency and distance of the non-standard anti-drone by removing ambient noise.

In addition, the signal processing unit 300 analyzes the signal of the non-standard anti-drone, and divides the transmission signal of the non-standard anti-drone and the transmission signal of the non-standard anti-drone controller by using at least one of the methods mentioned in FIGS. 6 to 10 and jamming. By generating the signal, there is an advantage in that the jamming signal can be effectively generated.

FIG. 2 is a diagram showing in detail a radiation pattern of a transmission signal radiated from the antenna 100 of FIG. 1.

As can be seen in FIG. 2, the antenna 100 may form a directional or omni-directional radiation pattern.

At this time, the radio wave receiver 200 may simultaneously receive ambient noise and radio waves received in the non-standard anti-drone direction through the omni-directional antenna and the directional antenna, and perform analysis on a frequency with a large size of the radio wave received in the non-standard anti-drone direction. I can.

Here, the radiation pattern is the angle at which the concentrated radiation pattern R300 is divided compared to the transmission direction of the radiation pattern with respect to the concentrated radiation pattern R300 in which power is concentrated, and is referred to as a half-value angle R220, and the radiation of the concentrated radiation pattern R300. The width may be expressed as an anterior tooth angle R210. Here, the preposition angle R210 may be classified and received by the radio wave receiving unit 200 by signal processing.

Therefore, there is an effect of reducing the size of the radio wave transmitter 400 that transmits the jamming signal by generating and transmitting a jamming signal by selecting only a frequency in a non-standard anti-drone direction without analyzing various frequencies using such a radiation pattern. .

3 is a diagram showing in detail the array antenna 110 generating the radiation pattern of FIG. 2.

As can be seen from FIG. 3, the antenna 100 may have a directional or non-directional radiation pattern respectively or simultaneously according to a gain and a phase of the array antenna 110.

That is, the antenna 100 is composed of a plurality of array antennas 110, and the radiation pattern radiated from the antenna 100 according to the distance between the array antennas 110, the signal phase of each of the array antennas 110, and the signal size. Is determined.

In this case, at least two unillustrated reception signal combining units for combining the received signal phase and the received signal magnitude of the array antenna 110 may be provided in the radio wave receiving unit 200, and according to a method of combining the respective received signal combining units. Since directivity and omnidirectionality can be simultaneously received from one antenna 100, there is an effect of reducing the size of the antenna 100.

4 is a detailed signal waveform showing a difference in frequency characteristics of a received signal according to characteristics of the antenna 100 of FIG. 1.

As can be seen in FIG. 4, the signal processing unit 300 may control the radiation pattern of the antenna 100 to extract the radiation frequency of the non-standard anti-drone among the received signals.

4(a) is a signal waveform showing the frequency characteristics of the received signal when the antenna 100 is omnidirectional, and FIG. 4(b) is a signal waveform showing the frequency characteristics of the received signal when the antenna 100 is directional. to be.

That is, as mentioned in FIG. 3, by canceling the omni-directional characteristic of the antenna 100 from the directional characteristic of the antenna 100, only the frequency generated by the non-standard anti-drone can be extracted, which is the omni-directional characteristic signal of the antenna 100. The drone generation frequency spectrum R410, which is a signal additionally appearing in the directivity characteristic of the antenna 100 compared to the reception frequency spectrum R400, may be extracted by filtering in the radio wave receiving unit 200.

Therefore, by analyzing the output of the two reception signal combiners for a signal of one antenna 100, there is an advantage that only frequencies generated by a non-standard anti-drone can be easily extracted.

5 is a signal waveform detailing the difference in received signal power according to the characteristics of the antenna 100 of FIG. 1.

As can be seen in FIG. 5, the signal processing unit 300 may extract a distance from a non-standard anti-drone by controlling the radiation pattern of the antenna 100.

FIG. 5(a) is a signal waveform showing the received signal power when the antenna 100 is omnidirectional, and FIG. 5(b) is a signal waveform showing the received signal power when the antenna 100 is directional.

That is, as mentioned in FIG. 3, only the signal generated by the non-standard anti-drone can be extracted by canceling the omni-directional characteristic of the antenna 100 from the directional characteristic of the antenna 100. At this time, the signal processing unit 300 can extract the distance of the non-standard anti-drone by converting and analyzing the received signal of the antenna 100 into a distance, which is a reception power distribution (R500), which is an omni-directional characteristic signal of the antenna 100 The drone generated power distribution R510, which is a signal additionally appearing in the directional characteristic of the contrast antenna 100, may be extracted by filtering in the radio wave receiving unit 200.

Accordingly, there is an advantage in that a distance to a non-standard anti-drone can be easily extracted by analyzing the outputs of the two reception signal combiners for a signal of one antenna 100.

6 is a signal waveform detailing a difference in a reception path between a transmission signal of the anti-drone 500 and a transmission signal of the anti-drone controller 600 received from the antenna 100 of FIG. 1.

As can be seen in FIG. 6, the signal processing unit 300 determines a signal directly received by the antenna 100 for at least two received signals as a transmission signal of the anti-drone 500, and the signal received by reflection is anti It may be determined as a transmission signal of the drone controller 600.

That is, since the anti-drone 500 is generally located in the air, and is located at the antenna 100 and the LOS (Line Of Sight), the anti-drone transmission signal R610 transmitted from the anti-drone 500 is directly received.

On the other hand, the anti-drone controller 600 is located on the ground, most can be located in the antenna 100 and NLOS (Non-Line Of Sight), the anti-drone controller transmission signal (R620) transmitted from the anti-drone controller 600 There may be a lot of reflected signals.

Therefore, the signal directly received by the antenna 100 is determined as the transmission signal of the anti-drone 500 and the signal received by reflection is determined as the transmission signal of the anti-drone controller 600 to separate and generate jamming signals. There is an advantage of generating a jamming signal.

7 is a signal waveform detailing the difference in reception level between the transmission signal of the anti-drone 500 and the transmission signal of the anti-drone controller 600 received from the antenna 100 of FIG. 1.

As can be seen in FIG. 7, the signal processing unit 300 determines that a relatively large signal for at least two received signals is a transmission signal of the anti-drone 500, and a relatively small signal is determined by the anti-drone controller 600. It can be determined by the transmission signal.

7(a) shows the temporal characteristics of the anti-drone transmission signal R710 and the anti-drone controller transmission signal R720, in which the anti-drone transmission signal R710 is received relatively larger than the anti-drone controller transmission signal R720. 7(b) also shows the temporal characteristics of the anti-drone transmission signal R740 and the anti-drone controller transmission signal R750, and the anti-drone transmission signal R740 is relative to the anti-drone controller transmission signal R750. It is a signal waveform that shows that it is received largely

That is, the anti-drone 500 is generally located in the air, is located at the antenna 100 and the LOS (Line Of Sight), and is located closer than the anti-drone controller 600, so in terms of time characteristics, the noise signal (R700 ), and the received anti-drone transmission signal (R710) can be received larger than the anti-drone controller transmission signal (R720), and in terms of frequency characteristics, the noise signal (R730) is removed and the received anti-drone transmission signal (R740) May be received greater than the anti-drone controller transmission signal R750.

On the other hand, the anti-drone controller 600 is located on the ground, and most of the antenna 100 and NLOS (Non-Line Of Sight) can be located, and the distance from the antenna 100 is also relatively far compared to the anti-drone 500. The signal transmitted from the drone controller 600 may be received in a small amount by the antenna 100.

Therefore, a relatively large signal with respect to at least two received signals determines a signal directly received by the antenna 100 as a transmission signal of the anti-drone 500 and a relatively small signal as a transmission signal of the anti-drone controller 600 There is an advantage in that the jamming signal can be efficiently generated by determining and generating the jamming signal separately.

Figure 8 is a signal showing in detail the difference in the reception level change according to the distance of the anti-drone 500 with respect to the transmission signal of the anti-drone 500 received from the antenna 100 of Figure 1 and the transmission signal of the anti-drone controller 600 It is a waveform.

As can be seen in FIG. 8, the signal processing unit 300 determines a signal that is inversely proportional to the distance to the anti-drone 500 for at least two received signals as a transmission signal of the anti-drone 500 and determines the anti-drone 500 A constant signal regardless of the distance from) may be determined as a transmission signal of the anti-drone controller 600.

Figure 8 (a) is a signal waveform showing the anti-drone transmission signal (R810) according to the distance between the anti-drone 500 and the antenna 100, Figure 8 (b) is between the anti-drone 500 and the antenna 100 This is a signal waveform showing the anti-drone controller transmission signal R820 whose level is irrelevant according to the distance.

That is, the anti-drone transmission signal R810 received by the antenna 100 may be largely received if the distance between the anti-drone 500 and the antenna 100 is close, and may be received as small as the distance between the anti-drone 500 and the antenna 100.

Meanwhile, since the position of the anti-drone controller transmission signal R820 is fixed, the same signal may be received regardless of the movement of the anti-drone 500.

Therefore, when the received signal is inversely proportional to the distance from the anti-drone 500, it is determined as the anti-drone transmission signal R810, and when the received signal is constant regardless of the distance to the anti-drone 500, the anti-drone controller transmission signal The jamming signal can be efficiently generated by discriminating and generating the jamming signal by determining (R820).

9 is a signal waveform detailing a difference in radio occupation time over time between a transmission signal of the anti-drone 500 and a transmission signal of the anti-drone controller 600 received from the antenna 100 of FIG. 1.

As can be seen from FIG. 9, the signal processing unit 300 determines that a signal with relatively small time occupation for at least two received signals is an anti-drone 500 transmission signal, and a signal with a relatively large time occupation is anti It may be determined as a transmission signal of the drone controller 600.

9(a) shows an anti-drone controller transmission signal R920 transmitted from the anti-drone controller 600 to the anti-drone 500 over time, and FIG. 9(b) is an anti-drone controller in the anti-drone 500 This is a signal waveform showing the anti-drone transmission signal R930 transmitted at 600.

That is, the anti-drone controller 600 must continuously control the posture of the anti-drone 500, so the signal for controlling the anti-drone 500 is transmitted at a new time, while the anti-drone 500 is the anti-drone controller 600. Since only a signal such as ACK for the control of can be transmitted, the time occupancy may be relatively small.

On the other hand, when the anti-drone 500 transmits an image, the time occupancy of the anti-drone transmission signal R930 may be greater than that of the anti-drone controller transmission signal R920, but it can be determined by referring to the characteristics of FIGS. 6 to 8. have.

Therefore, when the anti-drone 500 does not transmit an image, a signal with a relatively small time occupancy is determined as a transmission signal of the anti-drone 500 and a signal with a relatively large time occupancy is a transmission signal of the anti-drone controller 600 It is determined that the jamming signal is generated by separating it, so that the jamming signal can be efficiently generated.

10 is a detailed signal waveform showing an impulse signal transmitted from the antenna 100 of FIG. 1.

As can be seen in FIG. 10, the signal processing unit 300 may transmit an impulse signal to the anti-drone 500 when there is no signal received from the anti-drone 500 and the anti-drone controller 600.

That is, when the transmission signal of the anti-drone 500 or the anti-drone controller 600 is not received by the antenna 100, the anti-drone 500 can perform autonomous driving using GPS, optical navigation, or a camera. There is no frequency at which jamming signals can be transmitted.

In this case, when a short time signal is transmitted, the frequency can be occupied by a broadband. In addition, by generating the impulse signal R910 with a large power, electromagnetic waves may be affected on the anti-drone 500 to destroy the electronic circuit of the anti-drone 500, and if there is a receiving antenna, it may directly affect the receiving unit. have.

Therefore, when the transmission signal of the anti-drone 500 or the anti-drone controller 600 is not received by the antenna 100, by transmitting the impulse signal R910 to the anti-drone 500, the electronic circuit of the anti-drone 500 There is an effect that can neutralize.

11 is a flowchart illustrating a broadband anti-drone jamming method according to an embodiment of the present invention.

As can be seen in FIG. 11, in the broadband anti-drone jamming method, the radio wave reception unit 200 receives radio waves (S100), and the radio wave reception unit 200 analyzes the received signal to perform signal processing (S200). , And transmitting a radio wave of the jamming signal generated by the signal processing unit 300 (S300).

In order to satisfy the characteristics of the broadband anti-drone jamming system, the antenna 100 has a structure capable of controlling directivity and omni-directionality, and through this, it is possible to accurately measure the frequency and distance of the non-standard anti-drone by removing ambient noise.

In addition, the signal processing unit 300 analyzes the signal of the non-standard anti-drone in the signal processing step (S200) and generates a jamming signal by distinguishing the transmission signal of the non-standard anti-drone and the transmission signal of the non-standard anti-drone controller, thereby effectively generating a jamming signal. There is an advantage to be able to transmit.

As described above, the broadband anti-drone jamming system and method according to the present invention has the advantage of generating a jamming signal by receiving only radio waves generated from a non-standard anti-drone, and distinguishing a non-standard anti-drone transmission signal from a transmission signal of a non-standard anti-drone controller. There is an advantage of increasing the efficiency of jamming by generating a jamming signal.

What has been described above includes examples of one or more embodiments. Of course, not all possible combinations of components or methods can be described for the purpose of describing the above-described embodiments, but those skilled in the art will recognize that many additional combinations and substitutions of various embodiments are possible. Accordingly, the described embodiments are intended to cover all alternatives, modifications and adaptations that fall within the spirit and scope of the appended claims.

Claims (11)

An antenna for transmitting and receiving radio waves;
A radio wave receiver for receiving radio waves from the antenna;
A signal processing unit that analyzes the received signal of the radio wave receiver and performs signal processing; And
Including; a radio wave transmission unit for transmitting a radio wave of the jamming signal generated by the signal processing unit,
The signal processor extracts a distance from a non-standard anti-drone by controlling the radiation pattern of the antenna,
The distance of the non-standard anti-drone is extracted by converting the received signal of the antenna into a distance and filtering a drone-generated power distribution, which is a signal additionally appearing in the directional characteristic of the antenna, compared to the received power distribution, which is the non-directional characteristic signal of the antenna,
For at least two received signals, a signal directly received by the antenna is determined as a transmission signal from an anti-drone, and a signal received as a reflection is determined as a transmission signal from an anti-drone controller, or
For at least two received signals, a relatively large signal is determined as a transmission signal from the anti-drone, and a relatively small signal is determined as a transmission signal from the anti-drone controller, or
For at least two received signals, a signal inversely proportional to the distance to the anti-drone is determined as a transmission signal of the anti-drone, and a constant signal regardless of the distance to the anti-drone is determined as a transmission signal from the anti-drone controller, or or
Broadband anti-drone jamming, characterized in that a signal with relatively small time occupation for at least two received signals is determined as a transmission signal of the anti-drone, and a signal with relatively large time occupation is determined as a transmission signal from the anti-drone controller system. The method of claim 1,
The antenna, a broadband anti-drone jamming system, characterized in that forming at least one radiation pattern of directional or omni-directional. The method of claim 2,
The antenna, a broadband anti-drone jamming system, characterized in that the directional or non-directional radiation pattern is formed respectively or simultaneously according to the gain and the phase of the array antenna. The method of claim 1,
The signal processor is a broadband anti-drone jamming system, characterized in that for extracting the radiation frequency of the non-standard anti-drone from the received signal by controlling the radiation pattern of the antenna. delete delete delete delete delete The method of claim 1,
The signal processing unit transmits an impulse signal to the anti-drone when there is no signal received from the anti-drone and the anti-drone controller. A radio wave receiving step of receiving a radio wave in a radio wave receiving unit;
A signal processing step of analyzing a received signal of the radio wave receiving unit to perform signal processing; And
Including; a radio wave transmission step of transmitting a radio wave of the jamming signal generated by the signal processing unit,
In the signal processing step, the distance from the non-standard anti-drone is extracted by controlling the radiation pattern of the antenna,
The distance of the non-standard anti-drone is extracted by converting the received signal of the antenna into a distance and filtering a drone-generated power distribution, which is a signal additionally appearing in the directional characteristic of the antenna, compared to the received power distribution, which is the non-directional characteristic signal of the antenna,
For at least two received signals, a signal directly received by the antenna is determined as a transmission signal from an anti-drone, and a signal received through reflection is determined as a transmission signal from an anti-drone controller
For at least two received signals, a relatively large signal is determined as a transmission signal from the anti-drone, and a relatively small signal is determined as a transmission signal from the anti-drone controller, or
For at least two received signals, a signal inversely proportional to the distance to the anti-drone is determined as a transmission signal of the anti-drone, and a constant signal regardless of the distance to the anti-drone is determined as a transmission signal from the anti-drone controller, or or
Broadband anti-drone jamming, characterized in that a signal with relatively small time occupation for at least two received signals is determined as a transmission signal of the anti-drone, and a signal with relatively large time occupation is determined as a transmission signal from the anti-drone controller Way.

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