KR20150093488A - System for cancelling radar reflection signal and method thereof - Google Patents

System for cancelling radar reflection signal and method thereof Download PDF

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Publication number
KR20150093488A
KR20150093488A KR1020140014339A KR20140014339A KR20150093488A KR 20150093488 A KR20150093488 A KR 20150093488A KR 1020140014339 A KR1020140014339 A KR 1020140014339A KR 20140014339 A KR20140014339 A KR 20140014339A KR 20150093488 A KR20150093488 A KR 20150093488A
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South Korea
Prior art keywords
signal
phase
antenna
degrees
radiation
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KR1020140014339A
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Korean (ko)
Inventor
장성훈
천창율
황주성
김준환
정용식
박상복
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국방과학연구소
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Priority to KR1020140014339A priority Critical patent/KR20150093488A/en
Publication of KR20150093488A publication Critical patent/KR20150093488A/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/021—Auxiliary means for detecting or identifying radar signals or the like, e.g. radar jamming signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
    • G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
    • G01S7/38—Jamming means, e.g. producing false echoes

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

The present invention relates to a radar return signal active cancellation system capable of canceling reflected waves generated when an external radar signal enters a structure through a single antenna, and a method thereof. The present invention relates to a radar return signal active cancellation system, The system includes a first phase shifter for receiving a received signal through one antenna when an external radar signal is incident on the structure and for inverting the phase of the received signal by 180 degrees; And an oscillation unit for amplifying the gain of the received signal whose phase is inverted to compensate for loss due to the inherent characteristic of the one antenna and for inverting the phase of the gain amplified received signal by 180 degrees and outputting it as a radiation signal, The first phase shifter may radiate the radiation signal output from the oscillation unit through the one antenna by inverting the phase of the radiation signal by 180 degrees.

Figure P1020140014339

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a system for canceling radar signals,

The present invention relates to a radar return signal active cancellation system and method.

The stealth technology according to the prior art is a technique that does not expose a position to the other side by removing or scattering a reflected wave generated when an external radar signal enters a structure. Usually, to remove the reflected wave, the radar signal is received by the receiving antenna, and the phase inverted signal is radiated to the transmitting antenna with the same size as the reflected wave.

Korean Patent Application No. 10-2008-0113633

An object of the present invention is to provide a radar return signal active cancellation system capable of canceling reflected waves generated when an external radar signal enters a structure through a single antenna and a method thereof.

A radar return signal active cancellation system according to an embodiment disclosed herein receives a received signal (incident signal) through an antenna when an external radar signal is incident on a structure, and the phase of the received signal is 180 degrees A first phase shifter for inverting the first phase shifter; And an oscillation unit for amplifying the gain of the received signal whose phase is inverted to compensate for loss due to the inherent characteristic of the one antenna and for inverting and inverting the phase of the gain amplified received signal by 180 degrees, The one-phase shifter can radiate the signal through the one antenna by inverting the phase of the received signal output from the oscillation unit by 180 degrees.

As an example related to the present invention, the degree of amplification of a received signal for compensating for loss due to the intrinsic characteristics of the one antenna may be set in advance.

In one embodiment of the present invention, the one antenna receives the outer radar signal, radiates the radial signal canceling the reflected signal generated when the outer radar signal is incident on the structure, It can be connected to crisis.

In one embodiment of the present invention, the oscillator includes: a circulator for receiving the reception signal inverted by 180 degrees from the first phase shifter and outputting the reception signal as it is; An X-band filter for passing only the X band among the frequency bands of the 180-degree phase-inverted reception signal output through the circulator; A variable gain amplifier for outputting the amplified reception signal as a radiation signal so as to compensate for a gain of a received signal in which the 180-degree phase of the X-band is inverted; And a second phase shifter for inverting the phase of the radiation signal by 180 degrees and outputting the phase-reversed radiation signal to the first phase shifter via the circulator, The phase of the radiation signal output from the circulator can be inverted by 180 degrees and the radiation signal of which the 180 degree phase is inverted can be radiated through the one antenna.

A system and method for canceling a radar return signal according to an embodiment of the present invention can cancel a reflection signal generated when an external radar signal is incident on a structure (for example, a flying object) through one antenna. For example, a radar return signal active cancellation system and method thereof according to an embodiment of the present invention includes a signal for canceling a reflected wave (reflection signal) generated when an external radar signal is incident on a structure (for example, a flying object) When the signal is radiated through one antenna, the magnitude of the signal is amplified in consideration of the characteristics and loss of the one antenna, thereby canceling the reflected signal (reflected signal).

A system and method for canceling a radar return signal according to an embodiment of the present invention includes a receiving antenna for receiving an external signal and an antenna for receiving an external signal using only one antenna And the coupling problem when using two antennas (a receiving antenna and a transmitting antenna) can be solved by amplifying and radiating a radiation signal.

1 is a block diagram illustrating a radar return signal active cancellation system according to an embodiment of the present invention.
Fig. 2 is a diagram showing that an output signal is amplified with respect to a 1 uV input signal at a frequency of 9 GHz.
3 and 4 are exemplary diagrams showing a CST simulation configuration.
5 is an exemplary view showing an incident wave of 9 GHz.
6 is an exemplary view showing a reflected wave for the structure.
FIG. 7 is an exemplary view showing a signal received by the probe. FIG.
8 is an exemplary view showing a reflection signal from which an incident signal is removed.
9 is a diagram illustrating an amplified radiation signal according to an embodiment of the present invention.
10 is an exemplary view showing a signal in which a reflected wave (reflected signal) and an amplified signal (amplified radiation signal) are canceled by an inverse phase relationship.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the technical idea of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention, parts not related to the description are omitted, and like parts are denoted by similar reference numerals throughout the specification.

1 is a block diagram illustrating a radar return signal active cancellation system according to an embodiment of the present invention.

1, a radar return signal active cancellation system 200 according to an embodiment of the present invention receives an external radar signal and generates an external radar signal, which is generated when the external radar signal is incident on a structure (for example, a flying object) And is connected to one antenna 100 that emits a radiation signal that cancels reflected waves (reflected signals).

In the radar return signal active cancellation system 200 according to the embodiment of the present invention,

(Incident signal) when the external radar signal is incident on a structure (for example, a flying object) through the single antenna 100 and inverts the phase of the received signal 180 A first phase shifter 210 for inverting the phase of the input signal;

Amplifies the gain of the received signal whose phase is inverted to compensate for the loss due to the inherent characteristic of the one antenna 100, and outputs the gain-amplified received signal as a radiation signal again (inverted) The first phase shifter 210 inverts the phase of the radiation signal output from the oscillation unit 220 and outputs (radiates) the signal through the one antenna 100. [ . The amplification degree of the signal for compensating the loss due to the inherent characteristic of the one antenna 100 can be set in advance.

The oscillation unit 220 includes:

A circulator 221 for receiving the received signal whose phase is inverted from the first phase shifter 210 and outputting the received signal as it is;

An X-band filter 222 for passing only the X band (for example, 8.0 to 10.0 frequency band) out of the frequency bands of the reception signal inverted in phase, output through the circulator 221;

Amplifies the gain of the received signal whose phase of the X band is inverted to compensate for loss due to the inherent characteristic of the one antenna 100, and outputs the amplified signal as a radiation signal (received signal whose phase is inverted) A variable gain amplifier 223 for outputting an output signal;

The phase of the radiation signal (gain-amplified and phase-inverted received signal) is re-inverted (equal to the phase of the original phase-received signal), and the phase is re-inverted (same as the phase of the original phase- And a second phase shifter (224) for outputting the emitted radiation signal to the first phase shifter (210) through the circulator (221)

The first phase shifter 210 inverts (inverts 180 degrees) the phase of the radiation signal output from the circulator 221 and the phase of the radiation signal is reversed (original phase) (Radiated) through the one antenna 100, thereby canceling the reflected wave (reflected signal) generated when the external radar signal is incident on the structure (for example, a flying object).

If the second phase shifter 224 is adjusted so that the circulator loop circuit 221 can be in phase with the predetermined frequency, the magnitude of the received signal can be amplified by about 20 dB in terms of voltage.

FIG. 2 shows that the output signal is amplified with respect to a 1 uV input signal at a frequency of 9 GHz, and is outputted when 1 uV is applied to the radar return signal active cancellation system 200 according to the embodiment of the present invention Fig.

An antenna simulation for the operation of the radar return signal active cancellation system 200 according to the embodiment of the present invention was performed. The program for the antenna simulation uses CST (Computer Simulation Technology), and the shape and size of the waveform can be expressed as a graph by recognizing the CST result as MATLAB.

3 and 4 are exemplary diagrams showing a CST simulation configuration.

As shown in FIG. 3-4, a square aluminum plate 3-1 having a length of 50 mm and a length of 50 mm was used as the structure, and on the aluminum plate 3-1, (3-2) was attached.

The simulation method is as follows.

First, the probe 3-2 is connected to the square aluminum plate 3-1, and a signal of 9 GHz as shown in FIG. 5 is generated from the position 400 mm away from the front.

5 is an exemplary diagram showing a signal of 9 GHz.

The reflected wave (reflected signal) for the structure and the received signal at the probe 3-2 are measured at the position separated by 400 mm. The reflected wave for the structure is shown in Fig. 6 and the signal received at the probe 3-2 is shown in Fig.

6 is an exemplary view showing a reflected wave for the structure.

FIG. 7 is an exemplary view showing a signal received by the probe. FIG.

 The reflected wave measured as shown in FIG. 6 is obtained by measuring both the incident signal and the reflected signal, so that FIG. 8 shows the reflected wave when the incident signal of FIG. 5 is removed.

8 is an exemplary view showing a reflection signal from which an incident signal is removed. That is, FIG. 8 shows only the reflection wave for the aluminum plate 3-1. 7, which is a signal received by the probe 3-2, is amplified through the oscillation unit 220, and the amplified signal (radiation signal) is shown in FIG.

9 is a diagram illustrating an amplified radiation signal according to an embodiment of the present invention.

The amplification degree of the radiation signal can be changed according to the magnitude of the voltage input to the variable gain amplifier 223. [ The variable gain amplifier 223 is adjusted so that the radiation signal is amplified to have the same magnitude as that of FIG. 8, which is the reflection signal, to be completely canceled. The result is shown in FIG.

10 shows an example of a signal obtained by canceling the reflected wave (reflected signal) and the amplified signal (amplified radiated signal) in an inverse phase relationship. The signal inputted to the probe 3-2 is amplified The phase is adjusted by the rear phase shifter to cancel the phase reversal.

As described above, in the radar return signal active cancellation system and method according to the embodiment of the present invention, a reflected wave (reflection signal) generated when an external radar signal is incident on a structure (for example, Lt; / RTI > For example, a radar return signal active cancellation system and method thereof according to an embodiment of the present invention includes a signal for canceling a reflected wave (reflection signal) generated when an external radar signal is incident on a structure (for example, a flying object) When the signal is radiated through one antenna, the magnitude of the signal is amplified in consideration of the characteristics and loss of the one antenna, thereby canceling the reflected signal (reflected signal).

A system and method for canceling a radar return signal according to an embodiment of the present invention includes a receiving antenna for receiving an external signal and an antenna for receiving an external signal using only one antenna And the coupling problem when using two antennas (a receiving antenna and a transmitting antenna) can be solved by amplifying and radiating a radiation signal.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (6)

A first phase shifter for receiving a reception signal generated when an external radar signal enters the structure through one antenna and inverting the phase of the received signal by 180 degrees;
And an oscillation unit for amplifying the gain of the received signal whose phase is inverted to compensate for loss due to the inherent characteristic of the one antenna and for inverting the phase of the gain amplified received signal by 180 degrees and outputting it as a radiation signal, ,
Wherein the first phase shifter inverts the phase of the radiation signal output from the oscillation unit by 180 degrees and emits the radiation signal through the one antenna. The active radar system of claim 1, wherein the degree of amplification of the received signal for compensating for loss due to the inherent characteristic of the one antenna is set in advance. The antenna according to claim 1,
Wherein the radar signal is radiated to cancel out a reflected signal generated when the external radar signal is incident on the structure, and is connected to the first phase shifter. The apparatus of claim 1, wherein the oscillation unit comprises:
A circulator for receiving the reception signal inverted by 180 degrees from the first phase shifter and outputting the reception signal as it is;
An X-band filter for passing only the X band among the frequency bands of the 180-degree phase-inverted reception signal output through the circulator;
A variable gain amplifier for amplifying a gain of a received signal having an inverted 180-degree phase of the X band to compensate for a loss due to the characteristic of the one antenna, and outputting the amplified received signal as a radiation signal;
And a second phase shifter for inverting the phase of the radiation signal by 180 degrees and outputting the phase-reversed radiation signal to the first phase shifter via the circulator,
Wherein the first phase shifter inverts the phase of the phase-inverted radiation signal output from the circulator by 180 degrees and radiates the radiation signal whose phase is inverted by 180 degrees through the one antenna Active Cancellation System of Radar Reflection Signals. Receiving a reception signal generated when an external radar signal is incident on the structure through one antenna;
Inverting the phase of the received signal by 180 degrees;
Amplifying the gain of the received signal whose phase is inverted to compensate for loss due to the inherent characteristic of the one antenna, inverting the phase of the gain amplified received signal by 180 degrees, and outputting it as a radiation signal;
And inverting the phase of the radiation signal by 180 degrees and radiating the radiation signal through the one antenna. 6. The method of claim 5, wherein the degree of amplification of the received signal for compensating for loss due to the inherent characteristic of the one antenna is set in advance.
KR1020140014339A 2014-02-07 2014-02-07 System for cancelling radar reflection signal and method thereof KR20150093488A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101666644B1 (en) 2016-02-11 2016-10-14 주식회사 휴미디어 A system for reflection power cancellation in radar antenna
KR20180074335A (en) * 2016-12-23 2018-07-03 국방과학연구소 Cross-eye jamming system
RU2679597C1 (en) * 2018-05-25 2019-02-12 Федеральное государственное казённое военное образовательное учреждение высшего образования "Военная академия воздушно-космической обороны имени Маршала Советского Союза Г.К. Жукова" Министерства обороны Российской Федерации Pulse-doppler airborne radar station operating method during detecting of air target - carrier of radio intelligence and active interference stations

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101666644B1 (en) 2016-02-11 2016-10-14 주식회사 휴미디어 A system for reflection power cancellation in radar antenna
KR20180074335A (en) * 2016-12-23 2018-07-03 국방과학연구소 Cross-eye jamming system
RU2679597C1 (en) * 2018-05-25 2019-02-12 Федеральное государственное казённое военное образовательное учреждение высшего образования "Военная академия воздушно-космической обороны имени Маршала Советского Союза Г.К. Жукова" Министерства обороны Российской Федерации Pulse-doppler airborne radar station operating method during detecting of air target - carrier of radio intelligence and active interference stations

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