KR102195235B1 - Smart jammer - Google Patents

Abstract

The present invention relates to a technique for selectively adjusting and setting a communication frequency band excluded from a jamming frequency band while wirelessly transmitting, toward an attack target, only the remaining frequency band except for a predetermined communication frequency band in a predetermined jamming frequency band. According to the present invention, the smart jammer comprises: a frequency generator loading noise for jamming into a frequency corresponding to a jamming band to generate the frequency of a jamming band; a transmission band generator generating and outputting a transmission band frequency consisting of frequencies of the remaining bands except for the frequency of a use band set by a controller in the jamming band applied from the frequency generator; a transmission antenna wirelessly transmitting the transmission band frequency output from the transmission band generator; and the controller providing a control signal for setting the use band to the transmission band generator to selectively set a frequency range corresponding to the use band. The transmission band generator variably sets the use band in accordance with the control signal applied from the controller to filter only the use band frequency from the frequency of the jamming band generated by the frequency generator and synthesizes the frequency of the 180° phase-shifted use band and the frequency of the jamming band, thereby generating the transmission band frequency.

Description

Smart jammer

The present invention relates to a technology for wirelessly transmitting only the remaining frequency bands excluding a specific communication frequency band from a preset jamming frequency band to an attack target side, but selectively variably setting a communication frequency band excluded from the jamming frequency band.

A wireless communication network transmits radio waves to the public so that information can be exchanged in various forms, such as one-to-one, many-to-one, and one-to-many, and disturbing the receiver that receives information using such a wireless communication network is prevented by wireless communication jamming ( jamming), and a device that transmits a jamming signal is called a jammer.

Jammers typically transmit frequency jamming signals, and the jammers transmit jamming signals at the same frequency as the attack target side equipment, making normal communication impossible due to crosstalk (signal distortion).

And, in general, jammers use a method of transmitting white noise to block wireless communication. White noise is noise that includes the output of all frequencies within a certain frequency band, and the relationship between the frequency and the ratio of its components follows a normal distribution.

In the case of using white noise, there is an advantage that even radio wave disturbance is possible in a relatively wide frequency band. However, when the bandwidth of white noise is narrow, the effectiveness of the radio wave disturbance decreases. I have a problem.

In addition, such jamming technology protects VIPs from remote explosives or provincial/wiretapping, protects the safety of local citizens dispatching overseas, and fundamentally prevents fraudulent behavior by test parties. The necessity is being demanded for various purposes in various places, such as to prevent cheating in Korea.

However, for the effect of jamming, since the jamming signal is wirelessly transmitted with a signal strength greater than a certain level, there is a problem that the freedom of communication is violated even for people who are not related to jamming located in a certain area where the jammer is installed.

1. Korean Patent Registration No. 10-1967886 (Name of invention: jamming signal generator and method)

Accordingly, the present invention was created in view of the above circumstances, by generating a jamming signal in the form of variably excluding a specific frequency band from the jamming frequency band and transmitting it to the attack target side, a communication terminal located around the jamming signal is transmitted. The technical purpose is to provide a smart jammer that enables the generation of jamming signals while smoothly securing the internal communication environment for the device.

According to an aspect of the present invention for achieving the above object, a frequency generator for generating jamming noise is loaded onto a frequency corresponding to a jamming band, and a use band set by a controller in a jamming band applied from the frequency generator. A transmission band generator for amplifying and outputting a signal at an amplification level set by a controller at a transmission band frequency consisting of frequencies of the remaining bands excluding frequencies, a transmission antenna for wirelessly transmitting a transmission band frequency output from the transmission band generator, and the transmission It is configured to include a controller for selectively setting a frequency range corresponding to a used band by providing a control signal for setting a use band to a transmission band generator by a band generator, wherein the transmission band generator is based on a control signal applied from the controller. By variably setting the use band, filtering only the used band frequency from the jamming band frequency generated by the frequency generator, and synthesizing the frequency of the use band converted 180° with the frequency of the jamming band to generate a transmission band frequency, and the The controller provides a smart jammer , characterized in that the higher the amplification level of the signal output from the signal transmission band generator as the frequency bandwidth of the used band excluded from the jamming band is wider.

In addition, the transmission band generator includes a coupler for distributing and outputting the jamming band frequency applied from the frequency generator to the first and second paths, and a delay unit connected to the first path of the coupler to output the jamming band frequency for a predetermined time delay. , A band variable unit that is connected to the second path of the coupler and filters and outputs only the used band frequency from the jamming band frequency, and variably sets the use band frequency according to a control signal applied from the controller, and is output from the band variable unit. A 180° phase conversion unit that converts the used band frequency by 180° phase conversion, and outputs by synthesizing the jamming band frequency applied from the delay unit and the 180° phase converted use band frequency applied from the 180° phase conversion unit. There is provided a smart jammer, characterized in that configured to include a signal synthesis unit.

In addition, the transmission band generator converts the jamming band frequency applied from the frequency generator to have a phase difference of 90° and outputs the jamming band frequency to the first and second paths, but outputs the jamming band frequency that is not phase-converted to the first path, A first hybrid coupler for outputting a 90° phase-converted jamming band frequency through a second path, a delay unit connected to a first path of the first hybrid coupler to output a jamming band frequency for a predetermined time delay, and the first hybrid coupler A band variable unit that is connected to the second path of and filters only the used band frequency from the 90° phase-converted jamming band frequency according to the control signal applied from the controller, and outputs the 90° phase-converted output from the band variable part. A second hybrid coupler that combines and outputs the used band frequency that is phase-converted by 180° by phase-converting the band frequency by 90°, and the jamming band frequency applied from the delay unit. A smart jammer is provided, characterized in that it is configured to include.

In addition, it is configured to further include a receiving antenna for receiving a signal applied wirelessly from the outside, and the frequency generator is configured to generate a broadband frequency as a jamming band frequency, and the controller When a signal is received as a signal having a certain signal strength or higher, a smart jammer, characterized in that controlling to generate a frequency of the corresponding band by varying a frequency band including the frequency of the received signal through the frequency generator into a jamming band Is provided.

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According to the present invention, by generating and transmitting a jamming signal in the form of variably excluding a specific frequency band from a preset jamming frequency band, the internal communication environment for a communication terminal located in the vicinity from which the jamming signal is transmitted is smoothly secured while jamming. Can generate a signal.

In addition, by varying the jamming frequency band transmitted wirelessly to the attack target side and setting the output level of the jamming signal differently according to the communication frequency bandwidth excluded from the jamming frequency band, it is confused in the tracking of the target emitting the jamming signal from the other side. Can give

1 is a diagram schematically showing the configuration of a smart jammer according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a functionally separated internal configuration of the transmission band generator 200 shown in FIG. 1;
FIG. 3 is a diagram illustrating a process of generating a transmission frequency signal in the transmission band generator 200 shown in FIG. 2;
FIG. 4 is a diagram showing a functionally separated internal configuration of another type of the transmission band generator 200 shown in FIG. 1;
5 is a diagram illustrating a transmission frequency signal generation process in the transmission band generator 200 shown in FIG. 4;

Since the embodiments described in the present invention and the configurations shown in the drawings are only preferred embodiments of the present invention, and do not represent all the technical spirit of the present invention, the scope of the present invention is limited to the embodiments and drawings described in the text. Should not be construed as limited by That is, since the embodiments can be variously changed and have various forms, the scope of the present invention should be understood to include equivalents capable of realizing the technical idea. In addition, since the object or effect presented in the present invention does not mean that a specific embodiment should include all of them or only those effects, the scope of the present invention should not be understood as being limited thereto.

All terms used herein have the same meaning as commonly understood by one of ordinary skill in the field to which the present invention belongs, unless otherwise defined. Terms defined in a commonly used dictionary should be construed as having the meaning of the related technology in context, and cannot be interpreted as having an ideal or excessively formal meaning that is not clearly defined in the present invention.

1 is a diagram schematically showing the configuration of a smart jammer according to a first embodiment of the present invention.

Referring to FIG. 1, the smart jammer according to the first embodiment of the present invention includes a frequency generator 100, a transmit band generator 200, a transmit antenna 300, and a controller 400.

The frequency generator 100 is generated by loading noise to prevent the attack target from receiving a communication signal at a frequency corresponding to the jamming band, and generates a broadband frequency signal or is specified according to the control of the controller 400. It can generate a frequency signal of the band. At this time, the frequency generator 100 may be a jamming signal generator.

In addition, the frequency generator 100 may change the jamming band in which the noise signal is loaded according to the control of the controller 400.

The transmission band generator 200 generates and outputs a transmission band frequency consisting of frequencies of the remaining bands excluding the used band set by the controller 400 in the jamming band applied from the frequency generator 100.

At this time, the transmission band generator 200 variably sets the use band according to the control signal applied from the controller 400 to filter only the use band frequency from the jamming band frequency applied from the frequency generator 100, and 180° A transmission band frequency is generated by synthesizing the phase-converted frequency of the use band and the frequency of the jamming band.

The transmission antenna 300 wirelessly transmits a frequency signal of a transmission band generated by the transmission band generator 200 to an attack target side. In this case, the transmission antenna 300 may transmit a transmission band frequency signal by setting a transmission direction differently at a predetermined period according to the control of the controller 400.

The controller 400 controls the overall operation of the smart jammer, and in particular, provides a control signal for setting a use band to the transmission band generator 200 to selectively variably set a frequency range corresponding to the use band.

Here, the use band may be set as a communication band for a user to use his or her own communication terminal in a peripheral area in which the smart jammer according to the present invention is installed, and may be a communication frequency band used by the user's communication terminal. For example, the user's communication terminal may be a communication terminal that receives communication services using different communication frequency bands, such as a radio, a 2G phone, a 3G phone, a 4G phone, and a 5G phone. Accordingly, in the present invention, the use band can be changed according to the type of communication terminal using different communication frequency bands existing in the area in which the smart jammer is installed, which can be arbitrarily set by a user or an administrator.

Meanwhile, in the present invention, a receiving antenna 310 for receiving a signal wirelessly applied from the outside may be additionally included, and a frequency band of a signal received through the receiving antenna 310 under the control of the controller 400 A frequency band including a may be set as a jamming band. And, the controller 400 alternately operates the transmission antenna 300 and the reception antenna 310 to perform signal reception processing at the reception antenna 310 at a time when the transmission band frequency is not transmitted from the transmission antenna 300 Do it.

At this time, the controller 400 corresponds to the reception signal band received through the reception antenna 310 through the frequency generator 100 when a signal other than the use band is received from the reception antenna 310 as a signal of a certain strength or higher. You can set the band to be a jamming band.

In addition, the controller 400 may vary and set the transmission signal level of the transmission band frequency based on the signal level of the reception signal applied from the reception antenna 310. That is, the controller 400 may set the power of the jamming signal to a certain level higher than the received signal level, but may set the signal level difference with the received signal to increase as the frequency bandwidth corresponding to the use band increases. In other words, as the frequency bandwidth of the transmission band is smaller than that of the jamming band output from the frequency generator 100, the difference from the received signal level is set to be larger, so that the jamming effect using the narrow band frequency can be further improved.

In addition, the controller 400 may set the signal strength of the transmission band frequency wirelessly output to the transmission antenna 300 to increase as the frequency bandwidth corresponding to the use band increases. In other words, as the frequency bandwidth of the transmission band is smaller than that of the jamming band output from the frequency generator 100, the signal strength of the transmission band frequency is set to be larger, so that the jamming effect using the narrow band frequency can be further improved.

That is, the present invention is characterized in wirelessly transmitting a signal in a band other than a specific use band in a preset jamming band as a jamming signal for an attack target.

2 and 3 are diagrams for explaining in more detail the configuration of a smart jammer according to the first embodiment of the present invention. FIG. 2 is a diagram showing the internal structure of the transmission band generation unit 200 shown in FIG. 1 functionally separated, and FIG. 3 is a diagram illustrating a transmission band frequency signal generation process in the transmission band generation unit 200 of FIG. It is illustrated.

Referring to FIG. 2, the transmission band generator 200 includes a coupler 210, a delay unit 220, a band variable unit 230, a phase conversion unit 240, a first signal amplification unit 250, and signal synthesis. A unit 260 and a second signal amplifying unit 270 are included. 3, a jamming band A input to the band variable unit 230, a used band B filtered by the band variable unit 230, and 180° phase-converted output from the phase conversion unit 240 The use band C and the transmission band D output from the signal synthesis unit 250 are illustrated.

The coupler 210 divides the jamming band frequency signal received from the frequency generator 100 by a predetermined ratio and distributes the signal to the delay unit 220 and the band variable unit 230. For example, the coupler 210 distributes the jamming band frequency signal by 7:3, and the jamming band frequency signal corresponding to "7" is output to the first path, that is, the delay unit 220, and the jamming band corresponding to "3" The frequency signal is output to the band variable unit 230. The frequency signal of the jamming band as shown in FIG. 3A is applied to the delay unit 220 and the band variable unit 230 through the coupler 210, respectively.

The delay unit 220 outputs the jamming band frequency signal applied from the coupler 210 with a predetermined time delay. The delay time is set as a time during which the signal output from the coupler 210 through the second path can be simultaneously synthesized by the signal combining unit 260.

The band variable unit 230 variably sets a frequency band corresponding to the use band according to a control signal applied from the controller 400, and is connected to the second path of the coupler 210 and applied from the coupler 210. Filters and outputs only the frequency band of the use band set in the jamming band. The frequency signal of the use band as shown in Fig. 3B is output. As shown in FIG. 3(B), the use band may be selectively set by the controller 400, and the frequency bandwidth may be variable and may be set to two or more different frequency bands within the jamming band.

In addition, the band variable unit 230 includes a plurality of bandpass filters and switches having different passbands, and selects and drives a bandpass filter corresponding to the use band through a switch according to the control signal of the dual control unit 300. , It can be configured to pass only signals in the corresponding frequency band. Also, the band variable unit 230 may be implemented as a digital filter in which a frequency band filtered according to a control signal applied from the control unit 300 is arbitrarily set.

The phase conversion unit 240 converts the phase of the use band frequency applied from the band variable unit 230 by 180° and outputs the converted. As shown in FIG. 3C, the output signal of the band variable unit 230 is phase-converted by 180° and then output.

The first signal amplifying unit 250 amplifies the frequency signal of the use band that has been phase-converted by 180° and outputs the amplified frequency signal to the signal synthesis unit 260. At this time, the signal amplification degree is set by the control signal of the control unit 300, and as the ratio divided into the second path corresponding to the signal ratio divided by the coupler 210 is smaller, the signal amplification degree of the signal amplification unit 250 is It is set large.

The signal synthesis unit 260 synthesizes and outputs the jamming band frequency signal applied from the delay unit 220 and the 180° phase-converted use band frequency signal applied from the first signal amplifying unit 250. As shown in (D) of FIG. 3, a transmission band frequency signal in a form in which the use band B is removed from the jamming band A is output.

The second signal amplification unit 270 amplifies the transmission band frequency signal output from the signal synthesis unit 260 to a predetermined level and outputs the amplified transmission band frequency signal to the transmission antenna 300.

At this time, the amplification degree of the second signal amplifying unit 270 is selectively set by the controller 400, and the smaller the frequency bandwidth of the transmission band compared to the jamming band, the larger the difference from the received signal level is, or The signal strength of the band frequency can be set large.

That is, according to the above embodiment, the frequency signal corresponding to the use band is filtered and output in the jamming band, the filtered use band frequency signal is phase-converted by 180°, and then the 180° phase-converted use band frequency signal and the jamming band By synthesizing the frequency signals, a transmission band signal in which the use band set by the user is removed from the preset jamming band is generated and wirelessly transmitted to the attack target side.

4 and 5 are diagrams for explaining the configuration of a smart jammer according to a second embodiment of the present invention. FIG. 4 is a diagram showing the internal configuration of the transmission band generation unit 200 shown in FIG. 1 being functionally separated, and FIG. 5 is a diagram illustrating a transmission band generation process in the transmission band generation unit 200 of FIG. .

Referring to FIG. 4, the transmission band generation unit 200 includes a first hybrid coupler 510, a delay unit 520, a band variable unit 530, a second hybrid coupler 540, and a transmission signal amplification unit ( 550). 3, a jamming band V input to the first hybrid coupler 510 and a 90° phase-converted jamming band W output to the band variable unit 530 from the first hybrid coupler 510 , A 90° phase-converted use band output from the band variable unit 530 (X), a 180° phase-conversion use band Y generated by the second hybrid coupler 540, and a second hybrid The transmission band Z output from the coupler 540 to the signal amplifying unit 550 is illustrated.

The first hybrid coupler 510 converts the jamming band frequency applied from the frequency generator 100 to have a phase difference of 90° and outputs the jamming band frequency to the first and second paths. And outputs the jamming band frequency converted by 90° to the second path. The roaming band frequency signal in the form of (V) of FIG. 5 is phase-converted by 90° as shown in (W) and applied to the band variable unit 530.

The delay unit 520 is connected to the first path of the first hybrid coupler 510 and outputs a delayed jamming band frequency signal applied from the first hybrid filter 510 for a predetermined time. The delay unit 520 is connected to the first input of the second hybrid coupler 540.

The band variable unit 530 is connected to the second path of the first hybrid coupler 510 and filters only a preset use band frequency signal from the 90° phase-converted jamming band frequency signal applied from the first hybrid coupler 510 And print it out. In FIG. 5, a 90° phase-converted jamming band frequency signal as shown in (W) is filtered and applied as a second input of the second hybrid coupler 540.

The second hybrid coupler 540 outputs the used band frequency signal applied from the band variable unit 530 and the jamming band signal applied from the delay unit 520 to have a phase difference of 90°, but from the band variable unit 530 By additionally converting the 90° phase-converted use band frequency signal to be applied, the use band frequency signal is finally converted into 180° phase. In addition, the second hybrid coupler 540 synthesizes the used band frequency signal in the 180° phase-converted state and the non-phase-transformed jamming band frequency signal applied from the delay unit 520 and outputs it. The second hybrid coupler 540 generates a 180° phase-converted use band frequency signal as shown in (Y) of FIG. 5, and synthesizes the phase-transformed state with the jamming band frequency signal (Z Generates a transmission band frequency signal in the form of ).

The signal amplification unit 550 amplifies a transmission band frequency signal applied from the second hybrid coupler 540 to a predetermined level and outputs the amplified transmission band frequency signal to the transmission antenna 300. At this time, the amplification degree of the signal amplification unit 550 is selectively set by the controller 400, as in the second signal amplification unit 270 of FIG. 2, and the smaller the frequency bandwidth corresponding to the transmission band compared to the jamming band, The difference between the received signal level and the signal level can be set to be large, or the signal strength of the transmission band frequency can be set to be large.

That is, according to the above embodiment, the jamming band frequency signal is phase-converted by 90°, the band used is filtered and output, and the 90° phase-converted used band frequency signal is phase-converted again by 90°, resulting in a used band frequency. By synthesizing the use band frequency signal and the jamming band frequency signal that are 180° phase-converted and 180° phase-converted, a transmission band frequency signal in the form of removing the use band set by the user from the preset jamming band is generated to the target side of the attack. Transmit wirelessly.

100: frequency generator, 200: transmission band generator,
300: transmitting antenna, 310: receiving antenna,
400: controller.

Claims (5)

A frequency generator generated by loading noise for jamming on a frequency corresponding to the jamming band,
A transmission band generator configured to amplify and output a signal at an amplification level set by the controller at a transmission band frequency consisting of frequencies of the remaining bands excluding the frequency of the band used by the controller in the jamming band applied from the frequency generator
A transmission antenna for wirelessly transmitting a transmission band frequency output from the transmission band generator, and
And a controller for selectively setting a frequency range corresponding to the use band by providing a control signal for setting a use band to the transmission band generator to the transmission band generator,
The transmission band generator variably sets a use band according to a control signal applied from the controller, filters only the use band frequency from the jamming band frequency generated by the frequency generator, and filters the frequency of the use band converted by 180° phase and the jamming. By synthesizing the frequencies of the bands, a transmission band frequency is generated,
The controller is a smart jammer , characterized in that setting the amplification level of the signal output from the signal transmission band generator to a higher level as the frequency bandwidth of the use band excluded from the jamming band increases.
The method of claim 1,
The transmission band generator,
A coupler for distributing and outputting the jamming band frequency applied from the frequency generator to the first and second paths,
A delay unit connected to the first path of the coupler to output a jamming band frequency for a predetermined time delay
A band variable unit that is connected to the second path of the coupler and filters and outputs only the used band frequency from the jamming band frequency, and variably sets the use band frequency according to a control signal applied from the controller;
A 180° phase conversion unit for outputting a 180° phase conversion of the used band frequency output from the band variable unit, and
And a signal synthesizing unit for synthesizing and outputting the jamming band frequency applied from the delay unit and the 180° phase-converted use band frequency applied from the 180° phase conversion unit.
The method of claim 1,
The transmission band generator,
Converts the jamming band frequency applied from the frequency generator to have a phase difference of 90° and outputs it to the first and second paths, outputs the jamming band frequency that is not phase-converted to the first path, and converts the phase to 90° to the second path. A first hybrid coupler for outputting the jamming band frequency,
A delay unit connected to a first path of the first hybrid coupler to output a jamming band frequency for a predetermined time delay,
A band variable unit that is connected to a second path of the first hybrid coupler and filters and outputs only a used band frequency from a 90° phase-converted jamming band frequency according to a control signal applied from the controller;
In addition to generating a 180° phase-converted use band frequency by 90° phase conversion of the 90° phase-converted use band frequency output from the band variable unit, the 180° phase-converted use band frequency and the applied from the delay unit A smart jammer comprising a second hybrid coupler that synthesizes and outputs jamming band frequencies.
The method of claim 1,
It is configured to further include a receiving antenna for receiving a signal wirelessly applied from the outside,
The frequency generator is configured to generate a broadband frequency as a jamming band frequency,
When a signal other than a used band is received from a receiving antenna as a signal having a certain signal strength or higher, the controller generates a frequency of the corresponding band by varying a frequency band including the frequency of the received signal to a jamming band through the frequency generator. Smart jammer, characterized in that to control so that.
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