KR101367236B1 - Apparatus for protecting signal - Google Patents

Apparatus for protecting signal Download PDF

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Publication number
KR101367236B1
KR101367236B1 KR1020130072077A KR20130072077A KR101367236B1 KR 101367236 B1 KR101367236 B1 KR 101367236B1 KR 1020130072077 A KR1020130072077 A KR 1020130072077A KR 20130072077 A KR20130072077 A KR 20130072077A KR 101367236 B1 KR101367236 B1 KR 101367236B1
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KR
South Korea
Prior art keywords
signal
band
carrier
unit
channel
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Application number
KR1020130072077A
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Korean (ko)
Inventor
최춘화
Original Assignee
주식회사 삼정솔루션
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Priority to KR1020130072077A priority Critical patent/KR101367236B1/en
Application granted granted Critical
Publication of KR101367236B1 publication Critical patent/KR101367236B1/en

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    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03GCONTROL OF AMPLIFICATION
    • H03G3/00Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20Automatic control
    • H03G3/30Automatic control in amplifiers having semiconductor devices
    • H03G3/3052Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04KSECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00Jamming of communication; Counter-measures
    • H04K3/20Countermeasures against jamming
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04KSECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K3/00Jamming of communication; Counter-measures
    • H04K3/60Jamming involving special techniques

Abstract

Radio wave protection device is disclosed. An apparatus of an embodiment of the present invention, a carrier generation unit for generating a carrier signal corresponding to a plurality of channels in the intermediate frequency (IF) band, RF unit for converting the carrier signal of the IF band to a radio frequency (RF) band And an amplifier for amplifying the output of the RF to a predetermined power level.

Description

TRS radio wave protection device {APPARATUS FOR PROTECTING SIGNAL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio wave protection device, and more particularly, to a radio wave protection device for transmitting a jamming signal corresponding to a signal of a predetermined frequency band.

In certain places, such as theaters, hospitals, concert halls and courts, it may be necessary to block radio communications by unspecified majority within the area. In this case, blocking of radio communication through jamming is also called jamming.

In general, a method of transmitting white noise is used to block wireless communication. What is white noise? Noise in which the output of all frequencies within a frequency band is included. The relationship between frequency and the proportion of its components is normally distributed.

In the case of using white noise, there is an advantage that even wave jamming is possible in a relatively wide frequency band, but there is a problem in that the effectiveness of wave jamming is lowered in a specific bandwidth.

On the other hand, TRS (Trunked Radio Service) is a communication method in which many subscribers share a lot of frequencies of a radio relay station, unlike conventional mobile communication in which each user uses only one frequency. It is being used for business communication in all industries including the infrastructure industry such as public and public institutions.

TRS can talk with tens of thousands of users at the same time, and can make calls from anywhere through base stations installed all over the country, and can simultaneously talk with several people at the touch of a button. And a disturbance scheme for a relatively narrow band TRS frequency is required.

The technical problem to be solved by the present invention is to provide a radio wave protection device that effectively blocks radio waves in the TRS band.

In order to solve the above technical problem, the radio wave protection device of an embodiment of the present invention, the carrier generation unit for generating a carrier signal corresponding to a plurality of channels in the intermediate frequency (IF) band; An RF unit converting the carrier signal of an IF band into a radio frequency (RF) band; And an amplifier configured to amplify the output of the RF to a predetermined power level.

In one embodiment of the present invention, the RF unit may convert the carrier signal to correspond to a plurality of channels corresponding to the plurality of channels.

In one embodiment of the present invention, the radio wave protection device may further include a user input unit for receiving an input for the channel selected by the user.

In one embodiment of the present invention, the carrier generation unit, when receiving a channel selection for any one of a plurality of channels from the user input unit may output a carrier signal of the channel.

In one embodiment of the present invention, the carrier generation unit may determine the output power level of the carrier signal in consideration of the output power level of the amplifier.

In one embodiment of the present invention, the carrier generation unit may change the number of tones of the carrier signal generated per channel by the user's selection.

In one embodiment of the present invention, the carrier generation unit may generate a random interval of the tone of the carrier signal generated per channel.

In one embodiment of the present invention, the radio wave protection device may further include a band pass filter (BPF) for suppressing a signal of an unwanted band of the output of the amplifier.

The present invention as described above, when the user knows the exact frequency of the communication device to be subjected to radio wave disturbance, the user can select the frequency, and only disturb the signal of the frequency band, the signal of the band without waste of resources It is effective to block.

1 is a conceptual diagram illustrating an embodiment of the radio wave protection device of the present invention to block radio waves.
2 is a block diagram of a radio wave protection device according to an embodiment of the present invention.
Figure 3 is an exemplary view for explaining the appearance of the radio wave blocking device of the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram illustrating an embodiment of the radio wave protection device of the present invention to block radio waves.

As shown in the figure, a service area for receiving a TRS signal propagated from a base transceiver station (BTS) 2 is called A, and a service for receiving a signal transmitted by the radio wave protection device 1 of the present invention. If the area is referred to as B, reception of the TRS signal is blocked for the C area, which is an area shared by the A and B areas.

That is, the radio wave protection device of the present invention generates a jamming signal for the purpose of blocking reception of the TRS signal transmitted from the BTS 2, and blocks the reception of the normal TRS, thereby disconnecting calls of all terminals in the C region. Device.

2 is a block diagram of a radio wave protection device according to an embodiment of the present invention.

As shown in the figure, the radio wave protection device of the present invention, a carrier generator 10, a radio frequency (RF) unit 20, an amplifier 30, a band pass filter (Band) A pass filter (BPF) 40, an antenna unit 50, a power supply unit 60, and a user input unit 70 may be included.

The power supply unit 60 receives a power of a predetermined voltage (for example, single-phase AC 220V) from the outside, and generates a carrier generating unit 10, an RF unit 20, and an amplifier unit 30. Supplies a predetermined direct current (DC) power source. The power supply unit 60 of the present invention may detect a heat or an overcurrent and notify the user that heat or overcurrent has occurred. To this end, the radio wave protection device of the present invention further includes a notification unit (not shown), so that when the power supply unit 60 detects that a failure has occurred, the user may visually or auditoryly check the visual or audio. May generate a notification.

The carrier generation unit 10 receives a predetermined DC power from the power supply unit 60 and generates a carrier signal in an intermediate frequency (IF) band. The DC power source received by the carrier generator 10 may be, for example, 9V. In addition, the predetermined frequency band may be, for example, 133 to 148 MHz band, but the present invention is not limited thereto. It will be apparent to those skilled in the art to which the present invention pertains.

In addition, the carrier generation unit 10 of the present invention may generate a signal of a predetermined frequency band by dividing the signal into a plurality of channels. This is to allow a user to select and use a required band.

That is, the carrier generation unit 10 may generate, for example, the 15 MHz signal of 133 to 148 MHz by dividing it into six channels of 2.5 MHz. That is, in this example, the first channel is 133 to 135.5 MHz, the second channel is 135.5 to 138 MHz, the third channel is 138 to 140.5 MHz, the fourth channel is 140.5 to 143 MHz, and the fifth channel is 143 to 145.5 MHz. , And the sixth channel may be 145.5 to 148 MHz. However, this is merely an example, and it is obvious that the present invention is not limited thereto.

The carrier signal generated by the carrier generator 10 is composed of a plurality of tones in the frequency band as described above. The number of tones of the carrier signal generated per channel may vary according to a user's selection. For example, the carrier signal may be generated at any one of 50, 80, 100, and 150 per channel, or randomly generated.

In the above example, if the number of tones per channel is 50, the interval between signals may be 50 ms, 31.25 ms for 80, 25 ms for 100, and 16.67 ms for 150.

Alternatively, the number of tones of carrier signals generated by the carrier generator 10 may be randomly determined. For example, signals are generated in steps of 50 ms, 31.25 ms, 25 ms, and 16.67 ms, respectively. May be In this case, 50 ms, 31.25 ms, 25 ms, and 16.67 ms steps may be repeatedly maintained.

The output power level of the carrier signal generated by the carrier generator 10 may be determined in consideration of the power level of the jamming signal that is finally output from the amplifier 30.

The RF unit 20 receives a predetermined DC power from the power supply unit 60, and converts a signal of the IF band generated by the carrier generator 10 into an RF band. The DC power received by the RF unit 20 from the power supply unit 60 may be, for example, 9V.

The RF unit 20 converts a carrier signal of each channel generated by the carrier generation unit 10 into an RF frequency band of a predetermined band, respectively. For example, the signal of the first channel (133 to 135.5 MHz) of the IF band is the signal of the first channel (851 to 853.5 MHz) of the RF band, and the signal of the second channel (135.5 to 138 MHz) of the IF band is the RF. Signal of the second channel (853.5 to 856MHz) of the band, signal of the second channel (138 to 140.5MHz) of the IF band is the signal of the third channel (856 to 858.5MHz) of the RF band, The four-channel (140.5 to 143MHz) signal is a signal of the fourth channel (858.5 to 861MHz) of the RF band, the fifth channel (143 to 145.5MHz) of the IF band signal is the fifth channel (861) of the RF band. To 863.5 MHz), the sixth channel (145.5 to 148 MHz) of the IF band is converted into a sixth channel (863.5 to 866 MHz) of the RF band. The frequency band converted by the RF unit 20 may be, for example, a TRS band. However, this is merely an example, and the present invention is not limited to the frequency band up-converting.

As described above, the radio wave protection device of the present invention, when generating a carrier signal corresponding to a channel selected by the user, up-converts the signal of the corresponding channel in the RF band, thereby efficiently jamming the signal selected by the user. Enable to print

The amplifier 30 receives a predetermined DC power from the power supply unit 60 and amplifies a signal output from the RF unit 20. The power level of the signal output from the amplifier 30 may have a power level somewhat larger than that of the TRS signal to be protected.

The BPF 40 suppresses the unwanted signal of the undesired band among the signals output from the amplifier 30, selects only the designated in-band signal, and outputs it to the antenna 50 as a TRS jamming signal. In one embodiment of the invention, the frequency band of the BPF 40 may be 851 to 866 MHz.

The antenna 50 emits a TRS jamming signal that is an output of the BPF 40.

When the user input unit 70 selects a frequency band to be blocked, the user input unit 70 receives an input for the selection. The user input unit 70 may be provided, for example, in the form of a button or in the form of a touch screen.

Figure 3 is an exemplary view for explaining the appearance of the radio wave blocking device of the present invention.

As shown in the figure, the radio wave blocking device of the present invention includes a component described in FIG. 1 in a predetermined housing 90, the display unit 80 to check the signal output to the outside of the housing 90 ) May be provided. In addition, a user input unit 70 that enables channel selection may be provided on the side of the display unit 80. However, the configuration of FIG. 2 is exemplary and the present invention is not limited thereto.

When the user presses any one of the buttons of the user input unit 70, a jamming signal for the corresponding channel may be generated. That is, the carrier generation unit 10 of the present invention generates only a carrier signal corresponding to a channel selected by the user among frequency bands composed of a plurality of channels by the user's selection, and the RF unit 20 After the upconversion and amplification by the amplifier 30, the antenna 50 emits the TRS jamming signal generated through the filtering of the BPF 40.

In the radio wave blocking device configured as shown in FIG. 2, when the power supply unit 60 detects heat or an overcurrent, the display unit 80 may visually notify the user of a failure.

Such a radio wave protection device according to an embodiment of the present invention allows a user to select a corresponding frequency when the exact frequency of a communication device to be subjected to radio wave disturbance is selected, and disturbs only a signal of the corresponding frequency band, You can effectively cut off the signal in that band without wasting it.

While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. Accordingly, the true scope of the present invention should be determined by the following claims.

10: carrier generation unit 20: RF unit
30: amplifier 40: BPF
50: antenna 60: power supply
70: user input unit 80: display unit
90: housing

Claims (8)

  1. A carrier generation unit generating a carrier signal corresponding to a plurality of channels for blocking reception of a frequency common communication (TRS) signal in an intermediate frequency (IF) band;
    An RF unit converting the carrier signal into a plurality of channels in a radio frequency (RF) band corresponding to a plurality of channels in an IF band;
    An amplifier for amplifying the output of the RF unit to a power level greater than the power level of the TRS signal;
    A user input unit configured to receive an input for a channel selected by the user; And
    Among the output of the amplification unit, and includes a band pass filter (BPF) for suppressing a signal of an unwanted band,
    The carrier generation unit may determine an output power level of a carrier signal in consideration of the output power level of the amplification unit, and when receiving a channel selection for any one of a plurality of channels from a user input unit, outputs a carrier signal of a corresponding channel.
    The number of tones of carrier signals generated per channel is changed by the user's selection through the user input unit, and the number of tones of carrier signals generated per channel is determined according to the interval of the tones of the carrier signal.
  2. delete
  3. delete
  4. delete
  5. delete
  6. delete
  7. The method of claim 1, wherein the carrier generation unit,
    And a random spacing of tones of carrier signals generated per channel according to a user's selection through the user input unit.
  8. delete
KR1020130072077A 2013-06-24 2013-06-24 Apparatus for protecting signal KR101367236B1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101516308B1 (en) * 2015-03-16 2015-05-04 최춘화 Random noise apparatus using cw signal

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050111227A (en) * 2004-05-21 2005-11-24 에스케이 텔레콤주식회사 Transmitter of base station for multi carrier typed asynchronous mobile communication system and method for transmission method in the same
KR20080059339A (en) * 2002-06-07 2008-06-26 인터디지탈 테크날러지 코포레이션 System and method for a direct conversion multi-carrier processor

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20080059339A (en) * 2002-06-07 2008-06-26 인터디지탈 테크날러지 코포레이션 System and method for a direct conversion multi-carrier processor
KR20050111227A (en) * 2004-05-21 2005-11-24 에스케이 텔레콤주식회사 Transmitter of base station for multi carrier typed asynchronous mobile communication system and method for transmission method in the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101516308B1 (en) * 2015-03-16 2015-05-04 최춘화 Random noise apparatus using cw signal

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