KR102016533B1 - Jamming system - Google Patents

Abstract

Disclosed is a jamming system for jamming a remote radio control signal used for remote control of a remote control object to make the remote control object out of control. According to the present invention, the jamming system comprises: a disturbance signal generator (110) which is installed in proximity to the remote control object and generates and emits a disturbance signal jamming a remote radio control signal to reach the remote control object side; and a shielding member (120) for shielding to limit the disturbance signal emitted from the disturbance signal generator within a predetermined range.

Description

Jamming System {JAMMING SYSTEM}

The present invention disturbs the radio control signal by generating and disturbing a disturbance signal for disturbing the radio control signal to an uncontrollable state, particularly when an explosive is installed in a place such as an airport or a stadium to remotely control it wirelessly. Related to jamming systems for disabling.

We live in a flood of information floods and live in a number of radio signals (hereinafter, simply referred to as 'frequency') that are used to send and receive this information over radio. While these frequencies provide a lot of convenience in real life, they are also frequently used for malicious purposes.

All products using frequency have a main purpose of wireless communication using frequency. Wireless communication is largely divided into voice communication and data communication, and data communication has been used in various fields.

There are various ways and examples of malicious use of these beneficial communications, and the frequency of malicious use is increasing. Examples include voyeurs using wireless drones, reconnaissance, terrorism using wireless, and remote commands using mobile phones. In recent years, large-scale terrorism, which remotely explodes after installing explosives in places such as airports, sports stadiums and large buildings, is also frequently occurring.

In order to disable such malicious wireless communication, a disturbing device, namely jammer, for disturbing a control signal using malicious wireless communication and making it uncontrollable has been developed. Early jammer products began to be used for military protection, but commercially available products were increasingly used by the public to protect their privacy.

Jammer is a technology that creates a jamming source that acts as an interference frequency to the frequency used for radio control, and sends an interference frequency to the radio control frequency to make it impossible to control. For example, there is a method of generating an interference signal to break down the SNR of the frequency, or generating an interference wave of the same frequency to disturb the frequency for radio control.

Representative examples include a noise generation method using a noise diode and a continuous wave (CW) generation method using an OP AMP.

The former is a method of generating noise using a noise diode, amplifying the signal, and using it as a jamming source.

FIG. 2 illustrates a typical example of an oscillator circuit for generating noise, and generates a noise signal from the diode D1 and amplifies the generated noise signal with the amplifiers LNA1 and LNA2. As shown in FIG. 3, the noise signal generated and amplified by the oscillator circuit as shown in FIG. 2 covers the jammer target signal, that is, the signal for wireless control, so that the wireless control signal S1 does not exist. How to make it. However, there is a disadvantage in that the frequency of the noise signal finally produced by the noise generation and amplification method of this type is limited to a band of 10 MHz or less at maximum. That is, as shown in FIG. 3, the magnitude of the noise signal Noise is equal to the area of the noise signal Noise shown as a rectangle, and the output of the noise generator (see FIG. 2) is the target signal S1. It must be higher than the peak of. Therefore, when generating a noise signal by this method, since the capacity of the high power amplifier used as the amplifier on the output side must be very high, it is practical to cover a wide frequency band or to implement a jammer product having high jamming efficiency. There is a very difficult problem. Noise generators of the type shown in Figure 2 are generally applied to low power products of 10MHz or less.

Next, the CW (Continuous Wave) generation method using the OP AMP, as a way to overcome the disadvantages of the noise generator using the noise diode, in particular to improve the frequency band and output power of the noise generator using the noise diode One way, one example is shown in FIG. 4.

Referring to FIG. 4, the CW signal of the 10 MHz band is oscillated using the OP AMP as shown in (a), where the frequency or the magnitude may be changed by modifying the resistance values R. FIG. As shown in (b), the signal REF generated in the OP AMP is input to the reference signal of the PLL to shift the frequency to the RF signal band using the PLL (FIG. 4B). 10MHz reference signal generated at PLL is illustrated as transitioning from PLL to 1000MHz). By shifting the frequency using the PLL in this manner, the disadvantage of the noise generator using the noise diode of FIG. 2 described above is solved. However, the CW generation method using the OP AMP has a disadvantage in that it is difficult to finely adjust the frequency and magnitude since the CW or the magnitude of the CW is adjusted by adjusting the resistance values R of the OP AMP. In this method, since only one band is generated when CW is generated, all wireless signals in the band are jammed, and since the signals are generated at regular intervals, the jamming effect is different depending on the modulation of the used signal. There are disadvantages. Despite these drawbacks, the current CW generation method using the OP AMP is more widely used than the noise generator using the noise diode.

CW generation method using the OP AMP and noise generator using the noise diode has the following disadvantages.

(1) The frequency sweep band and sweep step of the CW signal source cannot be precisely adjusted.

(2) Unable to generate a waveform signal with CW and bandwidth.

(3) Jammer signal source cannot be easily changed / controlled.

On the other hand, when the jamming signal generator for jamming to make the control of the explosives can not be controlled, it is possible to block the explosion control signal to disable the explosion control, but the control of various communication devices located within the coverage of the disturbance signal generator There is a problem that causes communication failure or communication failure.

Therefore, there is a need in the art for a solution to these various problems.

The problem to be solved by the present invention, when using a disturbance signal generator may be to prevent the explosion control by blocking the explosion control signal, it is possible to solve the inability or communication failure of various communication devices located within the coverage of the disturbance signal generator It is to provide a new concept of jamming system that can effectively solve the problem caused.

In addition, the present invention is to provide a jamming system that can solve the disadvantages of the conventional CW generation method using the OP AMP and the noise generator using the noise diode.

A jamming system according to an aspect of the present invention for solving the above problems is a jamming system for jamming a remote radio control signal used for remote control of a remote control object to make it out of control, and is installed in proximity to the remote object. A disturbance signal generator for generating and radiating a disturbing signal jamming the remote radio control signal to reach the remote control object side, and a shielding member for shielding to limit the disturbance signal emitted from the disturbance signal generator within a predetermined range. It is characterized by including.

According to one embodiment, the shielding member is composed of a double shielding film, the total shielding performance of the double shielding film may be 80dB or more.

According to one embodiment, the shielding performance of one of the double shielding film may be more than 40dB.

According to an embodiment, the disturbance signal generator may include a digital oscillator that receives a reference clock signal and generates a CW signal, generates a predetermined modulation signal, and synthesizes the modulation signal and the CW signal generated by the digital oscillator. A modulation core for generating an IF modulated signal, and a frequency converter for receiving an IF modulated signal generated by the modulation core to generate an RF signal.

According to one embodiment, the shield member may be composed of a metal fiber containing silver.

According to one embodiment, the frequency of the IF modulated signal is less than 1.7GHz, the frequency of the RF signal may be higher than 2GHz.

The digital oscillator may include: a reference frequency multiplier that multiplies the frequency of the input reference clock signal, an analog-digital converter that receives a reference signal multiplied by the reference frequency multiplier and converts the digital signal into a digital signal; And a timing controller for synchronizing the digital signal from the analog-to-digital converter using a system clock to generate synchronized digital reference clock data, and receiving the synchronized digital reference clock data and digital data corresponding to a synthesized signal frequency. A digital synthesizer that converts the digital synthesizer to a digital signal, a digital-to-analog converter that converts digital data from the digital synthesizer into an analog signal, and the harmonic components included in the analog signal output by the digital-analog converter. And a harmonic filter.

According to an embodiment, the modulation core comprises: an FPGA for generating a modulation signal source, a digital-to-analog converter for generating I / Q baseband data using the modulation signal source and the CW signal, and the I / Q And an I / Q modulator that modulates the baseband data into an IF signal having a predetermined modulation band.

According to the present invention, a jamming system of a new concept may be used to prevent explosion control by blocking an explosion control signal when the disturbance signal generator is used, but it is impossible to communicate with various communication devices located within the coverage of the disturbance signal generator. It has the effect of solving a problem that causes a communication failure.

In addition, the present invention can solve the disadvantages of the conventional CW generation method using the OP AMP and the noise generator using the noise diode.

In addition, the present invention has the effect of shielding the disturbance signal emitted by the internal disturbance signal generator while shielding the remote control signal for controlling the remote control object.

1 is a conceptual diagram of a jamming system 100 according to an embodiment of the present invention,
2 to 4 are diagrams for explaining conventional oscillator circuits,
5 and 6 are block diagrams illustrating the disturbance signal generator 110 in FIG. 1.
7 is a view for explaining various modified use examples of the disturbance signal generator 110 of the present invention,
8 is a graph showing examples of representative signals in the frequency domain that may be used for control,
9 and 10 are block diagrams illustrating a configuration example of the digital oscillator 1101 in the disturbance signal generator 110 of the present invention.
11 and 12 are timing diagrams illustrating a method of generating a synthesized signal having a predetermined synthesized signal frequency in the digital synthesizer 1101d.
13 to 15 are block diagrams showing an example of the configuration of the modulation core 1102 in the disturbing signal generator 110 of the present invention,
16 is a graph illustrating a frequency multiplication method using the frequency multiplier used in the digital oscillator 1101 of the present invention.
17 is a view for explaining a frequency conversion method using a PLL in the digital oscillator 1101 of the present invention,
18 is a view for explaining a frequency conversion method using a mixer in the digital oscillator 1101 of the present invention,
19 is a diagram for explaining a frequency conversion method in which a mixer is omitted in the digital oscillator 1101 of the present invention.

Hereinafter, with reference to the accompanying drawings will be described preferred embodiments of the present invention. It is to be noted that the accompanying drawings and the embodiments described with reference to them are illustrated and simplified for the purpose of helping those skilled in the art to understand the present invention.

First, referring to FIG. 1, the jamming system 100 of the present invention jams the remote radio control signals CS1 to CS4 used for remote control of a remote control object (explosive object) 1, thereby controlling remotely. Control by means of disabling the explosive 1, for example. The jamming system 100 of the present invention includes a disturbance signal generator 110 and a shield member 120.

First, the shielding member 120 performs a shielding tent (or shield tent) function. The shielding member 120 shields the disturbing signal JS emitted by the disturbing signal generator 110 to an area inside the shielding member 120. To perform the function. As will be described later, the disturbance signal JS generated by the disturbance signal generator 110 is a signal having various frequency bands, and communication devices within the coverage of the disturbance signal generator 110, for example, a mobile subscriber. Of the mobile devices, the communication equipment or various facilities in the facility, or the communication of the mobile base stations will disable or cause communication failures. Therefore, the shielding member 120 is provided to perform a role of shielding the disturbance signal JS emitted from the disturbance signal generator 110 to prevent the communication failure or communication failure in advance.

The shielding member 120 is composed of a double shielding film to enhance the shielding function as shown, the total shielding performance of the double shielding film is preferably 80dB or more. Therefore, the shielding performance of one shielding film of the double shielding film is preferably 40 dB or more. As the shielding member 120, a metal fiber material may be used, and the metal fiber material may include silver. In addition, the shielding member 120 is configured to cover the four sides and the upper surface using the metal fiber material, and the poles 1201 at each of the four corners of the inner shielding film and the four corners of the outer shielding film made of the metal fiber material. After installation, it may be configured to cover the sides and the top surface with a metal fiber material.

Next, the disturbing signal generator 110 will be described with reference to FIGS. 5 to 19. In the present specification, particularly in the following description, a CW (Continuous Wave or Constant Wave) signal is a term that refers to a signal in an initial state having a predetermined frequency and not being frequency modulated.

First, as shown in FIGS. 5 and 6, the disturbance signal generator 110 of the present invention includes a digital oscillator 1101, a Modulation Core 1102, and a Frequency Converter 1103. do.

Looking at the overall operation of the disturbance signal generator 110, the digital oscillator 1101 receives a reference clock to generate a continuous wave (CW), the modulation core 1102 generates a predetermined modulation signal In addition, the modulated signal and the CW signal generated by the digital oscillator 1101 are synthesized to generate an intermediate frequency modulated signal IF Modulation (Ms of FIG. 6) (see FIG. 13 to FIG. 15 further). The IF modulated signal may be, for example, a signal Ms of 2 GHz or less. The frequency converter 1103 generates an IF modulated signal Ms (eg, a signal of 2 GHz or less) and an RF signal Mc. The RF signal Mc generated by the frequency converter 1103 is an RF signal Mc of 2 GHz or more.

As shown in (a) of FIG. 7, a CW signal may be generated using only the digital oscillator 1101 and used as a jammer signal according to the purpose of use. As shown in (b) of FIG. The oscillator 1101 and the modulation core 1102 may be used together to be used as a jammer signal generator in a band of 2 GHz or less, and as shown in FIG. 7C, the digital oscillator 1101 and the frequency converter 1103. Can be used together as an RF jammer signal generator.

In addition, it will be described below with respect to the problems of the aforementioned conventional disturbance signal generators.

First, there is a disadvantage that the frequency sweep band and the sweep step of the conventional CW signal source cannot be precisely adjusted. That is, as shown in FIG. 8, examples of representative signals that may be used for control may include TRS, FM, 3G, 4G, WIFI, and the like for each frequency. As shown, it can be seen that signals having different modulation schemes are arranged for each frequency. Therefore, the jamming signal source should be able to fine-tune the sweep band, frequency, sweep step, and sweep timing for the generated signal. Such granular adjustment is difficult to implement with a conventional analog oscillator.

Therefore, when the digital oscillator 1101 is used as in the present invention, the reference signal can be generated up to 3.4 GHz by multiplying the reference clock, thereby effectively responding to various jamming signal sources.

9 and 10, the digital oscillator 1101 of the present invention includes a reference frequency multiplier 1101a, an analog-to-digital converter (AD) 1101b, a timing controller 1101c, and a digital synthesizer. 1101d, serial / parallel data port 1101e, digital-to-analog converter 1101f, and harmonic filter 1101g.

In the digital oscillator 1101 of the present invention, the reference frequency multiplier 1101a may multiply the frequency of an input reference clock to generate a reference signal up to 3.4 GHz.

The analog-to-digital converter 1101b receives a frequency multiplied reference signal and converts it into a digital signal. That is, as shown in FIG. 10, the analog-to-digital converter 1101b receives a signal multiplied by a frequency, and converts it into a digital signal such as 01010101 ... 01 and outputs it (since it is a binary data type digital signal, This is sometimes referred to as 'digital data'). Digital data by the analog-to-digital converter 1101b is synchronized by the timing controller 1101c using a system clock (not shown). Here, the synchronized signal (or data) is defined as synchronized digital reference clock data. The synchronized digital reference clock data is changed to digital data (e.g., 001100110011 ..., 0011) corresponding to the signal frequency (synthetic signal frequency) generated by the digital synthesizer 1101d, and the digital-to-analog converter 1101f is It receives this and outputs an analog signal (for example, a signal having a waveform at the output terminal of the DA 1101f of FIG. 10). At this time, since the signal output from the digital-analog converter 1101f includes a myriad of harmonic components, the harmonic filter 1101g removes the harmonic components from the output analog signal of the digital-analog converter 1101f, The CW signal of the type shown in 10 is finally outputted.

11 and 12 illustrate a method of generating a synthesized signal having a predetermined synthesized signal frequency in the digital synthesizer 1101d. As shown in FIG. 11, a reference signal may be used to generate a composite signal such as a reference signal / 2.5 Hz, a reference signal / 10 Hz, and a multi signal (a signal having various frequencies), and the reference may be up to 2 ³² . By dividing the signal, we can create a digital synthesizer with a resolution of 1 Hz. In addition, various CW signal waveforms may be generated as shown in FIG. 12 using the reference signal.

11 and 12, reference numeral 1101e, which is not described, is a serial / parallel data port, and is a component for communicating with the CPU side through an I / O interface.

As described above, the digital oscillator 1101 may generate CW signals having various waveforms, but this alone does not produce a modulation signal having a predetermined band. Therefore, there is a need for a configuration for generating a modulated signal having a constant band, which plays a role in the modulation core 1102 (FIG. 5).

13 to 15 are block diagrams schematically showing the configuration of the modulation core 1102. 13 to 15, the modulation core 1102 includes a field programmable gate array (FPGA) 1102a, a digital-analogue converter 1102b, and an I / Q modulator 1102c.

First, the FPGA 1102a generates various modulation sources such as FM, PCM, QAM, 4QAM, 16QAM, etc. having fictional signals (eg, 1111, 01010101, 0000000) under the control of the CPU 1104. Serve

Then, the digital-to-analog converter 1102b receives a modulation signal source from the FPGA 1102a and generates I / Q base band data (I Data, Q Data) capable of various digital modulations. . Examples of I / Q baseband data are shown in FIGS. 14 and 15 as (a) and (b), respectively. I / Q baseband data ((a), (b)) are undemodulated data and are fictitious signals without a certain protocol. Also known as digital noise or white noise.

In the I / Q modulator 1102c, the I / Q baseband data ((a) and (b)) are used to convert to an intermediate frequency (IF) signal having a constant modulation band. The local oscillation signal generated by the local oscillator (LO in FIG. 14) is phase shifted by 90 degrees, and the local oscillation signal of -30 dB or more is attenuated at the output. As illustrated in FIG. 14, the I / Q modulator 1102c may include a local oscillator LO, and synthesize the local oscillation signal generated therefrom using the mixers M1 and M2. As shown in FIG. 14, when the local oscillator LO is provided therein, the intermediate frequency is always fixed. Therefore, a method of changing the intermediate frequency part may be considered as shown in FIG. 15.

As shown in FIG. 15, when using the local oscillator LO without using the internal local oscillator LO and using it as an input of the I / Q modulator 1102c, it has a modulation and frequency converter function. Can be used. At this time, since the digital oscillator 110 may serve as a local oscillator LO, the output of the digital oscillator 110, that is, the CW signal may be used as the local oscillation signal of the I / Q modulator 1202c. , An intermediate frequency signal MS having various intermediate frequencies may be generated.

On the other hand, as described above, there is a disadvantage that the jammer signal source can not be easily changed / controlled in the conventional method, it can be solved through the above configuration. That is, the frequency, step, single signal, modulation waveform, etc. in the digital oscillator 1101 can be easily changed digitally.

Since the analog-to-digital converter (AD) 1101b / digital-to-analog converter (DA) 1101f uses 3.4 GHz, the frequency generated is 3.4 GHz / 2 = 1.7 GHz at maximum. Frequencies above 1.7 GHz can be generated by current methods in the following ways (hence, if AD / DA is above 3.4 GHz as the technology evolves in the future, the maximum frequency generated will be higher).

First, a frequency expansion method using a frequency multiplier will be described. The frequency multiplier refers to receiving a reference frequency (fo) signal and multiplying it by an integer multiple, for example, generating a frequency multiplied signal such as 2xfo, 3xfo, 4xfo, 5xfo, 6xfo, 7xfo, ..., and the like. As shown in FIG. 16, after multiplying the reference frequency fo, only a signal of a band to be used (in the case where 10 multiplication frequencies are selected in FIG. 16) may be selected and used.

Next, a frequency conversion method using a PLL. As shown in FIG. 17, a method of converting a frequency using the PLL 1103A uses a digital oscillator 1101 at a reference port using a PLL of a frequency band to be used, and a reference signal of various signal types. When the input frequency is changed, the shape and frequency of the signal at the output terminal of the PLL are changed. An example of the frequency converter 1103 in the form implemented as shown in (c) of FIG. 7 may be the use of the PLL in this manner.

Next, a frequency conversion method using a mixer (Mixer). As shown by 1103B in FIG. 18, when a mixer is used, a frequency signal may be generated by adding or subtracting a local oscillation (LO) signal, which is an output of the PLL, by inputting a reference frequency (FO) signal to the mixer. Here, the LO signal may be generated by a PLL (an example of a frequency converter) controlled by the digital oscillator 1101 to generate an RF signal through a mixer. In this case, a band pass filter must be used at the output to remove the LO and sideband signal components.

Alternatively, as shown at 1103C in FIG. 19, when a modulation core 1102 with external input is used, a method of directly generating a signal by omitting the mixer may be used.

100: jamming system
110: disturbance signal generator
120: shielding member
1101: digital oscillator
1102: modulation core
1103: frequency converter

Claims (7)

A jamming system for jamming a remote radio control signal used for remote control of a remote control object to make it out of control.
A disturbance signal generator installed in proximity to the remote control object to generate and emit a disturbance signal jamming the remote radio control signal to reach the remote control object side; And
And a shielding member shielding the disturbing signal emitted from the disturbing signal generator to limit the disturbing signal within a predetermined spatial range.
The shielding member is installed to surround the outside of the space where the remote control object and the disturbance signal generator is located to perform a shield tent function so that the disturbance signal radiated from the disturbance signal generator does not go out to the outside. Prevents communication failure of communication devices located outside of the shielding member due to the disturbing signal radiated;
The shielding member is composed of a double shielding film to have an inner shielding film and an outer shielding film, the total shielding performance of the double shielding film is 80 dB or more, and the shielding member has a rectangular cross section, and the four corners of the inner shielding film and the outer And a pole located at each of the four corners of the shield. delete The method according to claim 1,
And the shielding performance of each of the inner shielding film and the outer shielding film is 40 dB or more. The method according to claim 1,
And the shield member is composed of a metal fiber comprising silver. The method according to claim 1,
The disturbance signal generator,
A digital oscillator that receives a reference clock signal and generates a CW signal;
A modulation core for generating a predetermined modulation signal and synthesizing the CW signal generated by the modulation signal and the digital oscillator to generate an IF modulation signal;
And a frequency converter configured to receive an IF modulated signal generated by the modulation core and generate an RF signal. The method according to claim 5,
The digital oscillator,
A reference frequency multiplier for multiplying the frequency of the input reference clock signal;
An analog-digital converter for receiving a reference signal multiplied by the reference frequency multiplier and converting the reference signal into a digital signal;
A timing controller for synchronizing the digital signal from the analog-to-digital converter using a system clock to generate synchronized digital reference clock data;
A digital synthesizer for receiving the synchronized digital reference clock data and converting the digital reference clock data into digital data corresponding to a synthesized signal frequency;
A digital-to-analog converter for converting digital data from the digital synthesizer into an analog signal;
And a harmonic filter for removing harmonic components contained in the analog signal output by the digital-to-analog converter. The method according to claim 5,
The modulation core,
An FPGA for generating a modulated signal source,
A digital-to-analog converter that generates I / Q baseband data using the modulated signal source and the CW signal;
And an I / Q modulator for modulating an IF signal having a predetermined modulation band using the I / Q baseband data.

Images