KR20130117664A - Apparatus for finding direction of radio signal transmitting source and method therefor - Google Patents

Apparatus for finding direction of radio signal transmitting source and method therefor Download PDF

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Publication number
KR20130117664A
KR20130117664A KR1020130027804A KR20130027804A KR20130117664A KR 20130117664 A KR20130117664 A KR 20130117664A KR 1020130027804 A KR1020130027804 A KR 1020130027804A KR 20130027804 A KR20130027804 A KR 20130027804A KR 20130117664 A KR20130117664 A KR 20130117664A
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South Korea
Prior art keywords
antenna
separation distance
antennas
direction angle
phase difference
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KR1020130027804A
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Korean (ko)
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주인원
이점훈
이상욱
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한국전자통신연구원
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Priority to US13/863,932 priority Critical patent/US20130271323A1/en
Publication of KR20130117664A publication Critical patent/KR20130117664A/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
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/04—Details
    • G01S3/043—Receivers
    • 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
    • G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
    • G01S3/02—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using radio waves
    • G01S3/14—Systems for determining direction or deviation from predetermined direction
    • G01S3/46—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems
    • G01S3/48—Systems for determining direction or deviation from predetermined direction using antennas spaced apart and measuring phase or time difference between signals therefrom, i.e. path-difference systems the waves arriving at the antennas being continuous or intermittent and the phase difference of signals derived therefrom being measured
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/084—Pivotable antennas

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

PURPOSE: An apparatus for detecting the direction of a radio signal transmitting source and a method thereof are provided to be applied to a wide frequency band with the simple configuration and improve the accuracy of direction detection. CONSTITUTION: An apparatus (500) for detecting the direction of a radio signal transmitting source comprises a first antenna (510), a second antenna (520), an antenna movement guide part (530), an antenna driver (540), an antenna driving controller (550), and a direction detector (560). The first and second antennas respectively receive a radio signal transmitted from the radio signal transmitting source and provide the received radio signal to the direction detector. The antenna movement guide part provides a linear movement path to the first and second antenna. The antenna driver provides driving force to the first and second antenna. The antenna driving controller provides a driving control signal to the antenna driver. The direction detector detects the direction angle of the signal received through the first and second antenna. [Reference numerals] (540) Antenna driver; (550) Antenna driving controller; (561) Phase detector; (563) Direction angle calculator; (AA,BB) Received signal; (CC) Phase difference; (DD) Direction angle; (EE) Driving control signal; (FF) Separation distance

Description

Apparatus for detecting direction of radio wave source and its method {APPARATUS FOR FINDING DIRECTION OF RADIO SIGNAL TRANSMITTING SOURCE AND METHOD THEREFOR}

The present invention relates to a technique for detecting the direction of a radio wave transmitter, and more particularly, to an apparatus and method for detecting the direction of a radio wave transmitter capable of accurately detecting the direction of a radio wave transmitter through a simple configuration.

Recently, there is a need to proactively cope with the rapid increase in the use of radio waves due to the popularization of wireless communication systems, the increasing demand for various services of wireless communication users, and the demand for deregulation due to the opening and internationalization of the communication market. In addition, there is a need for the fair and efficient use of limited frequency resources and the systematic establishment of radio wave order.

For effective radio wave management, the quality of radio waves may be traced to areas of poor communication quality, traceability and location of illegal radio transmitters, identification of radio users who transmit radio waves over the authorized band, and poor insulation of electrical equipment or power lines. Items such as the cause tracking of harmful interference signals and noise and the tracking of sources of foreign radio waves that have penetrated into Korea should be considered. To do this, the direction detection for the radio wave source of the frequency band of interest should be prioritized.

In general, an array antenna composed of a plurality of antennas is used to detect a direction of a radio wave transmitter, and a direction is mainly detected by comparing magnitudes or phases of signals respectively received from the radio wave transmitters to a plurality of antennas.

The direction detection method of a radio wave transmitter through phase comparison detects the direction of a radio wave transmitter by determining an angle of arrival (AOA) using a phase difference between signals received by an array antenna. Such a method has a feature that a higher resolution can be obtained than a method of detecting the direction of a radio wave transmission source by comparing the magnitude of a signal.

Conventionally, multiple antennas and phase detectors have been used to cover wideband frequencies and to improve the accuracy of directional angle detection.

1 is a conceptual diagram illustrating a conventional direction detection method of a radio wave transmitter.

Hereinafter, a direction detection method of a conventional multi-baseline interferometry method will be described with reference to FIG. 1.

The conventional multi-baseline interferometer type direction detection device 100 includes antenna 1 (101), antenna 2 (102), antenna 3 (103), antenna 4 (104), and antenna 1 (101). Phase detector 1 (111) connected between antenna 2 (102), phase detector 2 (112) connected between antenna 1 (101) and antenna 3 (103), connected between antenna 1 (101) and antenna 4 (104). And a phase angle detector 121 that calculates a direction angle based on the phase difference values provided from the phase detectors 1111 to 3113.

In the direction detecting apparatus 100 having the structure as described above, the separation distance d12 of the antenna 1 101 and the antenna 2 102 is set to a half wavelength λ / 2 so that the antenna 1 101 and the antenna are By using the phase difference between the signals respectively received by 2 (102), a direction angle without ambiguity can be calculated.

On the other hand, in the conventional direction detection technology is applicable to a wideband frequency, and further provided with antenna 3 (103) and antenna 4 (104) to improve the accuracy of the direction angle, antenna 1 (101) and antenna 3 (103) And phase detector 2 112 and phase detector 3 113 which detect phase differences between the signals received by antenna 1 101 and antenna 4 104.

In addition, the separation distance d13 between the antenna 1 101 and the antenna 3 103 is set longer than a half wavelength to detect and detect a phase difference between the signals received through the antenna 1 101 and the antenna 3 103, respectively. The direction angle is calculated using the phase difference value. In this case, ambiguities exist by calculating a plurality of directional angles, but the ambiguity problem is solved using the directional angles previously calculated through the distance d12 between the antenna 1 101 and the antenna 2 102. That is, the direction angle calculated based on the separation distance d13 is reduced compared to the direction angle calculated using the separation distance d12, and as a result, the accuracy of the direction is improved.

On the other hand, in the case of extending the separation distance d13 between the antenna 1 101 and the antenna 3 103 to the maximum, in theory, the error of the direction angle can be minimized, but the direction calculated by the separation distance d12 There are several directional angle solutions in the angle, which cannot solve the ambiguity problem.

Therefore, the separation distance d13 may not be increased infinitely, and the separation distance d13 may be increased within a range capable of solving the ambiguity problem through the direction angle calculated at the separation distance d12.

Due to the limiting factors described above, antenna 1 (101) and antenna 4 (104) having a separation distance longer than the separation distance (d13) in order to reduce the error more than the direction angle calculated through the separation distance (d13). I use it.

That is, using the phase difference between the signals received by the antenna 1 101 and the antenna 4 104, respectively, is more than the case where the phase difference between the signals received by the antenna 1 101 and the antenna 3 103 is used. The ambiguity is increased due to the presence of the direction angle, but the ambiguity problem can be solved using the direction angle already calculated through the separation distance d13 between the antenna 1 101 and the antenna 3 103. The direction angle calculated through d14) is further reduced in error than the direction angle calculated using the separation distance d13, and thus the accuracy of the direction angle is further improved.

As shown in FIG. 1, the conventional direction detection technique using phase comparison can be applied to a wideband frequency and can improve accuracy by reducing the error of the direction angle, but for this purpose, a plurality of antennas must be provided. A plurality of phase detectors for detecting the phase difference between the signals received from the antennas should be provided.

Therefore, there is a disadvantage in that the configuration of the direction detecting apparatus is complicated, and the cost of manufacturing the direction detecting apparatus increases because a plurality of expensive phase detectors are required.

On the other hand, when using two antennas and one phase detector to solve the above-mentioned disadvantages, the error of the direction angle increases as the absolute value of the direction angle is closer to 90 degrees.

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a direction detecting apparatus for a radio wave transmitter having a simple configuration and applicable to a wide frequency band and improving direction detection accuracy.

In addition, another object of the present invention is to provide a direction detecting method performed in the direction detecting apparatus described above.

In order to achieve the above object of the present invention, an apparatus for detecting a direction of a radio wave transmitter according to an aspect of the present invention includes first and second antennas for receiving radio signals, and mechanically coupled to the first and second antennas, respectively. Moving guide means for providing a moving path through which the first and second antennas can be linearly moved, and driving force for linearly moving at least one of the first and second antennas in response to a driving control signal; A driving controller configured to provide a driving control signal for separating the first and second antennas by a predetermined separation distance, and a phase difference and the separation distance of the radio signal received from the first and second antennas, respectively. And a direction detector to calculate a direction angle of the radio signal.

The driving control unit may provide the driving control signal so that the first and second antennas move in a direction close to each other or move linearly in a direction away from each other.

Herein, the driving controller may provide a driving control signal to the driving unit to gradually extend the separation distance between the first and second antennas.

The driving control unit may provide the driving control signal such that the separation distance between the first and second antennas is a first separation distance that is less than or equal to half the wavelength of the radio signal, and the direction detecting unit has the first separation distance. The first direction angle may be calculated based on the phase difference of the signals received through the first and second antennas and the first separation distance. The driving controller may provide a driving control signal for separating the first and second antennas by a second separation distance that is longer than the first separation distance after calculating the first direction angle. The direction detector may calculate a second direction angle based on the phase difference of the radio signals received through the first and second antennas having the second separation distance and the second separation distance.

Here, the direction detecting unit is the first direction angle of the plurality of direction angles when there are a plurality of direction angles calculated based on the phase difference and the second separation distance of the radio signals received through the first and second antennas The closest direction angle can be calculated as the second direction angle.

Here, the direction detection unit determines whether or not to improve the accuracy on the basis of the calculated direction angle, and if the precision improvement is necessary for the separation control signal to set the separation distance longer than the set separation distance May be provided to the driving controller.

Here, the direction detector includes a phase difference detector for detecting phase differences of radio signals received from the first and second antennas, and a direction angle calculator for calculating the direction angle based on the detected phase difference and the set separation distance. can do.

In addition, the method for detecting the direction of the radio wave transmitter according to an aspect of the present invention for achieving another object of the present invention, by moving at least one of the two antennas so that the distance between the two antennas is the first separation distance. Calculating a first direction angle of the received signals based on a phase difference between the signals received through the two antennas and the first separation distance; Moving at least one of the two antennas so that the second separation distance is longer than the separation distance, and the phase difference between the signals received through the two antennas having the second separation distance and the second separation distance, respectively Calculating a second direction angle of the received signals based on a distance.

Here, the direction detection method of the radio wave transmitter has a plurality of direction angles of the received signals calculated based on the phase difference between the signals received through the two antennas having the second separation distance and the second separation distance. In this case, the method may further include determining a direction angle closest to the first direction angle among the plurality of direction angles as the second direction angle.

Here, in the direction detecting method of the radio wave transmitter, after calculating the second direction angle, determining whether the precision of the direction angle is necessary based on the calculated direction angle, and improving the precision of the direction angle. If necessary, moving at least one of the two antennas so that the distance between the two antennas is a third separation distance longer than the second separation distance and the two antennas having the third separation distance The method may further include calculating a third direction angle of the received signals based on the phase difference between the received signals and the third separation distance.

The calculating of the third direction angle may include calculating a phase difference between signals received through two antennas having the third separation distance and the direction angles of the received signals calculated based on the third separation distance. In the case of a plurality of directions, the method may include determining the direction angle closest to the second direction angle among the plurality of direction angles as the third direction angle.

Here, the first spacing is set to less than half of the wavelength of the received signal, the second spacing is set to have a longer distance than the first spacing, but the two antennas having the second spacing In the case where there are a plurality of direction angles of the received signals calculated based on the phase difference between the signals received and the second separation distance, the direction angle can be calculated using the direction angle closest to the first direction angle. Can be set within the distance.

According to the apparatus and method for detecting the direction of the radio wave transmitter as described above, the apparatus includes a antenna moving guide unit, an antenna driving unit, and an antenna driving control unit so as to change the separation distance between the first and second antennas, and the first and second antennas. After setting the separation distance to a distance less than the half-wavelength as the initial value, the direction angle is calculated based on the phase difference between the signals received through the first and second antennas. Then, the direction angle is calculated based on the phase difference between the signals received through the first and second antennas while gradually extending the separation distance of the first and second antennas. Here, when a plurality of direction angles corresponding to the phase difference occurs due to the extended antenna separation distance, the ambiguity problem is solved by selecting the direction angle closest to the direction angle calculated in the previous step among the plurality of direction angles.

Therefore, by providing only one phase detector and the direction angle calculator, it is possible to simply configure the direction detecting device, thereby reducing the manufacturing cost of the direction detecting device.

In addition, since the direction angle can be calculated by freely adjusting the separation distance between the two antennas, it can be applied to a wideband frequency, and the error of the direction angle can be minimized even in a 90 degree adjacent region where the error of the direction angle occurs a lot. This can improve the accuracy of the direction angle.

1 is a conceptual diagram illustrating a conventional direction detection method of a radio wave transmitter.
2 is a conceptual diagram illustrating a method of detecting a direction of a radio wave transmitter using phase comparison.
3 is a graph illustrating a relationship between a phase difference and a direction angle when the separation distance between two antennas is half wavelength.
4 is a graph showing the relationship between the phase difference and the direction angle when the separation distance between the two antennas is more than half wavelength.
5 is a block diagram illustrating an apparatus for detecting a direction of a radio wave transmitter according to an embodiment of the present invention.
6 is a flowchart illustrating a direction detection method of a radio wave transmitter according to an embodiment of the present invention.
7 to 9 are flowcharts illustrating in more detail a method for detecting a direction of a radio wave transmitter according to an embodiment of the present invention shown in FIG. 6.

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.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the present invention, the same reference numerals are used for the same constituent elements in the drawings and redundant explanations for the same constituent elements are omitted.

Hereinafter, the direction detection method of the radio wave transmission source using phase comparison, which is an operation principle of the direction detection apparatus and method of the radio wave transmission source according to an embodiment of the present invention, will be described first.

2 is a conceptual diagram illustrating a method of detecting a direction of a radio wave transmitter using phase comparison.

Referring to FIG. 2, the first antenna 201 and the second antenna 202 are spaced apart by a distance d, and a signal having a wavelength of λ transmitted from a signal source 203 is a first antenna 201. ) And the second antenna 202, the signal received at the first antenna 201 has a phase difference of ΔΨ than the signal received at the second antenna 202.

On the other hand, when the incident angle of the received signal with respect to the imaginary line 205 perpendicular to the baseline 204 of the first antenna 201 and the second antenna 204 is φ, it is received by the second antenna 202. The relationship between the wavelength and the phase of a signal can be expressed as in Equation 1.

Figure pat00001

Using Equation 1, the phase difference ΔΨ of the signals received through the first antenna 201 and the second antenna 202 may be obtained as shown in Equation 2 below.

Figure pat00002

In addition, Equation (2) can be expressed as Equation (3) with respect to the direction angle φ of the radio wave transmission source 203.

Figure pat00003

That is, as shown in Equation 3, when the phase difference ΔΨ between the signals received through the first and second antennas 201 and 202 is known, the direction angle φ of the radio wave transmission source 203 can be calculated.

3 is a graph illustrating a relationship between a phase difference and a direction angle when the separation distance between two antennas is half wavelength (that is, d = λ / 2).

In FIG. 3, the x-axis represents the arrival angle φ (or direction angle, unit: degrees) of the signal received through the two antennas, and the y-axis represents the phase difference ΔΨ (unit: degrees) respectively received through the two antennas.

As shown in FIG. 3, when the separation distance between the two antennas is half wavelength (λ / 2), ambiguity of the direction angle φ value corresponding to the phase difference ΔΨ does not occur, and one direction depends on the phase difference ΔΨ value. Each φ value corresponds.

For example, in FIG. 3, when an error of ± 15 degrees occurs at -115.7 degrees in the phase difference value ΔΨ, the direction angle φ may be confirmed that an error of ± 12.5 degrees occurs around -40 degrees.

Meanwhile, as the direction angle φ approaches 90 degrees in FIG. 3, the slope of the graph becomes more gentle, and it can be seen that the error of the direction angle φ generated due to the error of the phase difference ΔΨ greatly increases.

Therefore, in the direction detection method of the radio wave transmitter using phase comparison, when the separation distance between the two antennas is half wavelength, the direction angle φ should be used within the range of about ± 65 degrees which is a linear section in FIG. It can be seen that.

4 is a graph showing the relationship between the phase difference and the direction angle when the separation distance between two antennas is more than half wavelength, and the phase difference when the separation distance between two antennas is 4.5 times the wavelength (that is, d = 4.5λ). Is a graph showing the relationship between and direction angles.

In FIG. 4, the x axis represents the arrival angle φ (or direction angle, in degrees) of the signals received through the two antennas, and the y axis represents the phase difference ΔΨ (in degrees) between the signals received through the two antennas, respectively.

As shown in FIG. 4, when the separation distance between two antennas is 4.5 times the wavelength (d = 4.5λ), ambiguity occurs in which there are several direction angles φ values corresponding to one phase difference ΔΨ. For example, when the phase difference value is 38.7 degrees in FIG. 4, the corresponding direction angles are -61 degrees, -40 degrees, -24 degrees, -12 degrees, 2 degrees, 13 degrees, 27 degrees, 44 degrees, and 67 degrees. An ambiguity problem may occur in which the directional angle of. However, since the slope of the graph is very steep, when the above ambiguity problem is solved, even if an error occurs in the phase difference value, the error of the corresponding direction angle occurs very little.

For example, assuming that a phase difference value of ± 15 degrees occurs in FIG. 4 as in FIG. Considering this, it can be seen that the direction angle error is very small ± 0.53 degrees.

In the apparatus and method for detecting a direction of a radio wave transmitter according to an embodiment of the present invention, the direction of the radio wave transmitter can be detected more accurately in consideration of the characteristics described with reference to FIGS. 2 to 4, and the configuration is simple and low cost. The present invention provides a direction detecting device and a direction detecting method applicable to a wideband frequency.

Hereinafter, a direction detecting apparatus and a direction detecting method of a radio wave transmitter according to an embodiment of the present invention will be described in detail with reference to FIGS. 5 to 9.

5 is a block diagram illustrating an apparatus for detecting a direction of a radio wave transmitter according to an embodiment of the present invention.

Referring to FIG. 5, the direction detecting apparatus 500 according to an embodiment of the present invention may include a first antenna, a second antenna 520, an antenna moving guide unit 530, an antenna driver 540, and an antenna driving controller ( 550 and a direction detector 560.

The first antenna 510 and the second antenna 520 respectively receive radio signals transmitted from radio wave transmitters and provide the received signals to the direction detector 560.

In addition, the first antenna 510 and the second antenna 520 are mechanically coupled to the antenna moving guide part 530 and installed to enable linear movement along the moving path formed in the antenna moving guide part 530. The separation distance D between 510 and 520 is adjusted. Here, the first antenna 510 and the second antenna 520 may be installed to linearly move in a direction closer to each other or to move linearly in a direction away from each other based on the center axis 501 of the antenna movement guide 530. Can be. Alternatively, the first antenna 510 is fixedly installed at one side of the antenna moving guide part 530, and the second antenna 520 is directed toward the first antenna 510 along the moving path formed in the antenna moving guide part 530. It may be configured to linearly move or linearly move in a direction opposite to the first antenna 510. Alternatively, the second antenna 520 is fixedly installed at one side of the antenna moving guide part 530, and the first antenna 510 is directed toward the second antenna 520 along the moving path formed in the antenna moving guide part 530. May be linearly moved or linearly moved in the opposite direction of the second antenna 520.

The antenna movement guide part 530 supports the first antenna 510 and the second antenna 520, and is a straight line for linearly moving in a direction in which the first antenna 510 and the second antenna 520 are closer or farther from each other. Provide a travel path.

The antenna driver 540 is close to each other along the linear movement path of the first antenna 510 and the second antenna 520 provided in the antenna movement guide part 530 corresponding to the driving control signal provided from the antenna driving controller 550. It provides a driving force to move linearly in the direction of losing or away from each other. Here, the antenna driver 540 may provide a driving force to simultaneously move the first antenna 510 and the second antenna 520 closer or farther from each other, or the first antenna 510 and the second antenna 520. The driving force may be provided so that only one of the antennas moves linearly.

The coupling structure for linear movement of the first antenna 510 and the second antenna 520 may be implemented by various known methods.

For example, the first antenna 510 and the second antenna 520 may be installed in the antenna support means 511 and 521 for supporting the first antenna and the second antenna, respectively, and the antenna movement guide part 530. Is configured in the form of a rail may be mechanically coupled to the lower portion of the support means (511, 521) of the first antenna 510 and the second antenna 520. In addition, a rack gear may be formed in the longitudinal direction of the rail of the antenna moving guide part 530. In addition, a fixed motor is installed under the antenna support means of the first and second antennas 510 and 520, and a pinion gear is installed at the end of the rotation shaft of the motor so that the rack gear and the pinion gear are coupled to each other. Can be configured. In this configuration, the motor attached to the lower portion of the antenna supporting means 511 or 521 of each antenna performs the function of the antenna driver 540 and corresponds to the driving control signal (for example, the current signal). The rotating shaft of the motor rotates in a predetermined direction, and the pinion gear fixedly coupled to the rotating shaft of the motor is rotated in a state coupled to the rack gear so that the antenna to which the motor is attached moves linearly along the rail on which the rack gear is formed. Accordingly, the first antenna 510 is controlled by controlling the rotation angle of the motor rotation shaft through an electrical signal supplied to the motor so that the antenna support means 511 and 521 with the antenna move linearly by a distance corresponding to the rotation angle of the rotation shaft. ) And the separation distance of the second antenna 520 may be adjusted.

The antenna driving controller 550 may provide the antenna driver 540 with a driving control signal for adjusting the separation distance D between the first antenna 510 and the second antenna 520. Here, the antenna driving control unit 550 may provide a driving control signal for adjusting the antenna separation distance D to the antenna driver 540 according to a preset antenna driving control method, and provide the antenna separation distance information to the direction detection unit. 560 may be provided. For example, the antenna driving control unit 550 transmits a driving control signal to the antenna driving unit 540 so that the antenna separation distance is gradually expanded from the smallest separation distance among the set antenna separation distances corresponding to a plurality of preset antenna separation distances. Can provide.

Alternatively, the antenna driving controller 550 controls the separation distance between the first antenna 510 and the second antenna 520 in response to the separation control signal provided from the direction detector 560 or a separate external device. The driving control signal may be provided to the antenna driver 540 such that the signal is at a separation distance indicated by the signal.

Alternatively, the antenna driving controller 550 adjusts the separation distance of the first antenna 510 and the second antenna 520 in real time in response to the separation control signal provided from the direction detector 560 or a separate external device. The driving control signal may be provided to the antenna driver 540.

The direction detector 560 detects a phase difference between the received signals provided from the first antenna 510 and the second antenna 520, and detects a phase difference between the detected phase difference and the first antenna 510 and the second antenna 520. The direction angle of the signal received through the first antenna 510 and the second antenna 520 is detected (or the direction of the radio wave transmitter) based on the separation distance D.

In detail, the direction detector 560 may include a phase detector 561 and a direction angle calculator 563.

The phase detector 561 receives the signals received from the first antenna 510 and the second antenna 520, respectively, compares the phases between the received signals, detects the phase difference between the two signals, and then detects the detected phase difference information. Is provided to the direction angle calculator 563.

The direction angle calculator 563 may determine the received signal based on the phase difference information provided from the phase detector 561 and the separation distance information of the first antenna 510 and the second antenna 520 provided from the antenna driving controller 107. After calculating the direction angle (or arrival angle), the calculated direction angle information is output. Here, the direction angle calculator 563 may be configured to provide a separation control signal for setting the separation distance between the first antenna 510 and the second antenna 520 to the antenna driving control unit 550, as described above. In this case, the direction angle may be calculated without receiving separate separation distance information from the antenna driving controller 550.

Further, the direction angle calculator 563 determines whether it is necessary to further improve the accuracy of the direction angle based on the calculated direction angle value, and if it is determined that it is necessary to further improve the accuracy of the direction angle, After providing the separation control signal to the antenna driving control unit to extend the separation distance between the second antennas (510, 520) more than the present time, after the separation distance between the first and second antennas (510, 520) is further extended than the present The direction angle is calculated by receiving phase difference information of the signals received through the first and second antennas 510 and 520 from the phase detector 561.

The direction angle calculator 563 may calculate the direction angle by using Equation 3, and when a ambiguity problem occurs in which a plurality of direction angles corresponding to the phase difference provided from the phase detector 561 occurs, the plurality of directions Among the angles, the direction angle closest to the previously calculated direction angle may be selected and output as the final direction angle.

FIG. 6 is a flowchart illustrating a direction detecting method of a radio wave transmitting source according to an embodiment of the present invention, and schematically illustrates a direction detecting method of a radio wave transmitting source performed in the direction detecting apparatus shown in FIG. 5.

Referring to FIG. 6, in the direction detecting method according to an embodiment of the present invention, the distance between the first antenna and the second antenna is set to D1 by controlling the linear motion of the first antenna and / or the second antenna. The phase difference between the signals received through the first and second antennas is detected, and the direction angle is calculated using the detected phase difference and the separation distance D1. Here, the separation distance may be determined as a length D1 ≦ λ / 2 less than half wavelength (S610).

Thereafter, the direction detecting apparatus sets the separation distance between the first antenna and the second antenna to be longer than the separation distance used for the previous direction angle detection to improve the accuracy of the direction angle, and then the first and second The phase difference between the signals received through the antenna is detected, and the direction angle is calculated using the detected phase difference and the extended separation distance (S620). Here, as the separation distance between the first antenna and the second antenna is extended, ambiguity may occur in which a plurality of direction angles corresponding to the phase difference between the signals received through the first antenna and the second antenna are provided. Therefore, the ambiguity can be solved by selecting the closest direction angle from the direction angle calculated in the previous step among the plurality of direction angles and determining the current direction angle.

Then, it is determined whether to improve the accuracy of the direction angle further (S630), and if it is necessary to further improve the accuracy of the direction angle, the process returns to step S620 to further increase the distance between the first and second antennas than the previous step. After the expansion, the direction angle is calculated based on the phase difference of the signals received through the first and second antennas and the extended separation distance.

Alternatively, if it is determined in step S630 that the accuracy of the direction angle does not need to be further improved, the direction angle calculated in step S620 is output as the final direction angle (S640).

7 to 9 are flowcharts illustrating the direction detection method of the radio wave transmitter according to the exemplary embodiment of the present invention shown in FIG. 6 in detail, and extending the separation distance between the first antenna and the second antenna in a stepwise manner. The process of measuring the angle three times is shown as an example.

7 to 9, first, the direction detecting apparatus calculates a half wavelength λ / 2 of a signal to detect a direction (S611). Here, the direction detecting apparatus may calculate the half-wavelength value of the direction detection target signal based on the frequencies of the signals received through the first and second antennas.

Thereafter, the direction detecting apparatus determines the first separation distance D1 between the first and second antennas as a half wavelength or less so as to prevent an ambiguity problem when calculating the direction angle of the received signal (S612). Here, the direction detecting apparatus may set the first separation distance D1 so that the ambiguity problem does not occur by using a result obtained through repetitive experiments on the relationship between the separation distance between the first and second antennas and the ambiguity.

In addition, the direction detecting apparatus spaces the first antenna and / or the second antenna by the determined first separation distance D1 (S613). Here, the antenna driving control unit of the direction detecting apparatus provides a driving control signal to the antenna driving unit, and the antenna driving unit linearly moves the first antenna and / or the second antenna in accordance with the driving control signal to remove the first and second antennas. It can be separated by 1 separation distance (D1).

Thereafter, the direction detecting apparatus detects a first phase difference between the first signal and the second signal received through the first and second antennas spaced apart from the first separation distance D1 (S614). Here, the detection of the first phase difference may be performed by the phase detector of the direction detecting device.

In operation S615, the first direction angle AAO 1 is calculated based on the detected first phase difference value and the first separation distance D1. Here, the first direction angle AAO 1 may be calculated by the direction angle calculator of the direction detection apparatus, and may use Equation 3 described above.

After calculating the first direction angle through the above-described process, a process for improving the direction detection accuracy is performed by reducing the error of the first direction angle that may occur due to the error of the first phase difference.

First, the direction detecting apparatus sets the separation distance between the first antenna and the second antenna to a second separation distance D2 longer than the previously set first separation distance (S621). Here, the second separation distance D2 may be set to be greater than or equal to half wavelength, and as the separation distance between the first antenna and the second antenna is extended to be greater than or equal to the first separation distance D1 (that is, more than half wavelength). As illustrated in FIG. 4, ambiguity may occur in which a plurality of directional angles corresponding to phase differences of signals received through the first antenna and the second antenna are provided. In this case, the ambiguity is determined by selecting the closest direction angle from the first direction angle AAO 1 calculated in the previous (that is, steps S611 to S615) among the plurality of direction angles, and determining the second direction angle AAO A 2 . I can solve it. Accordingly, the second separation distance D2 can be clearly selected when selecting the closest direction angle using the first direction angle AAO 1 calculated in the previous step among the plurality of direction angles in which ambiguity exists. The maximum distance can be selected within the range.

Thereafter, the direction detecting apparatus spaces the first antenna and / or the second antenna by the determined second spacing distance (S622). Here, the antenna driving control unit of the direction detecting apparatus provides a driving control signal to the antenna driving unit, and the antenna driving unit drives the linear movement of the first antenna and / or the second antenna in response to the driving control signal so that the first and second antennas Can be spaced apart by a second separation distance.

Thereafter, the direction detecting apparatus detects a second phase difference between the first signal and the second signal received by the first and second antennas spaced apart by the second separation distance D2 (S623). Here, the detection of the second phase difference may be performed by the phase detector of the direction detecting device.

In operation S624, a plurality of direction angles are calculated based on the detected second phase difference value and the second separation distance D2. In this case, an ambiguity problem may occur in which a plurality of direction angles corresponding to the second phase difference value exist.

Subsequently, the direction detecting apparatus solves the ambiguity problem by determining a direction angle having a value closest to the first direction angle among the plurality of direction angles corresponding to the second phase difference value as the second direction angle AAO 2 (S625). do.

After calculating the second direction angle through the above-described process, the direction detecting apparatus determines whether the direction angle detection accuracy should be further improved (S630). Here, the direction detecting apparatus may determine that the direction angle detection accuracy should be further improved when the error of the second direction angle is larger than the reference value by comparing the error of the second direction angle with a preset reference value.

If it is determined in step S630 that it is not necessary to further improve the direction angle detection accuracy, the second direction angle is determined as the final direction angle (S640).

Alternatively, when it is determined in step S630 that the direction angle detection accuracy needs to be further improved, the direction detecting apparatus may further determine that the distance between the first antenna and the second antenna is longer than the second distance D2, and the third distance is longer. The distance D3 is set (S631). Here, the third separation distance D3 may clearly select a direction angle when the closest direction angle is selected using the second direction angle AAO 2 calculated in the previous step among the plurality of direction angles in which ambiguity exists. The maximum distance can be selected within the range.

Thereafter, the direction detecting apparatus spaces the first antenna and / or the second antenna by the determined third separation distance D3 (S632). Here, the antenna driving control unit of the direction detecting apparatus provides a driving control signal to the antenna driving unit, and the antenna driving unit drives the linear movement of the first antenna and / or the second antenna in response to the driving control signal so that the first and second antennas May be spaced apart from the third separation distance D3.

Thereafter, the direction detecting apparatus detects a third phase difference between the first signal and the second signal received by the first and second antennas spaced by the third separation distance D3 (S633). Here, the detection of the third phase difference may be performed by the phase detector of the direction detecting device.

At least one direction angle is calculated based on the detected third phase difference value and the third separation distance D3 (S634). Here, an ambiguity problem may occur in which a plurality of direction angles corresponding to the third phase difference exist. In this case, the direction angle calculator of the direction detecting apparatus sets the direction angle closest to the previously calculated second direction angle AAOA 2 among the plurality of direction angles corresponding to the third phase difference to the third direction angle AAO 3 . By solving the ambiguity problem (S635).

Thereafter, the direction detecting apparatus outputs the calculated third direction angle AAO 3 as the final direction angle AAO n + 1, where n is a natural number of 1 or more (S640).

In the method for detecting the direction of the radio wave transmitter according to the embodiment of the present invention shown in FIGS. 7 to 9, the separation distance between the first antenna and the second antenna is the first separation distance, the second separation distance, and the third separation distance. For example, the process of improving the accuracy of the direction angle while linearly moving the first and second antennas to increase stepwise, the direction detection method according to the present invention is not limited to performing three direction angles, Depending on the accuracy of the calculated direction angle, less than three or more than three direction angle calculation processes may be performed.

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 in the appended claims. It will be possible.

101: antenna 1 102: antenna 2
103: antenna 3 104: antenna 4
111: phase detector 1 112: phase detector 2
113: phase detector 3 121: direction angle calculator
201: first antenna 202: second antenna
203: radio wave transmitter 500: direction detecting device
510: first antenna 511: antenna support means
520: second antenna 521: antenna support means
530: antenna moving guide portion 540: antenna driving portion
550: antenna drive control unit 560: direction detection unit
561: phase detector 563: direction angle calculator

Claims (13)

First and second antennas for receiving radio signals, respectively;
Movement guide means mechanically coupled to the first and second antennas and providing a movement path through which the first and second antennas can move in a straight line;
A driving unit providing a driving force for linearly moving at least one of the first and second antennas in response to a driving control signal;
A driving control unit providing the driving control signal to space the first and second antennas by a predetermined separation distance; And
And a direction detector configured to calculate a direction angle of the radio signal based on the phase difference and the separation distance of the radio signals respectively received from the first and second antennas. The method according to claim 1,
The drive control unit
And the driving control signal is provided by the movement guide means so that the first and second antennas move in a direction close to each other or move linearly in a direction away from each other. The method according to claim 1,
And the driving controller provides a driving control signal to the driving unit to gradually extend the separation distance between the first and second antennas. The method according to claim 1,
The driving control unit may provide the driving control signal such that the separation distance between the first and second antennas is a first separation distance that is less than or equal to half of the wavelength of the radio signal, and the direction detector includes a first separation distance having the first separation distance. And calculating a first direction angle based on a phase difference of the signal received through the second antenna and the first separation distance. The method of claim 4,
After calculating the first direction angle, the driving controller provides a driving control signal for separating the first and second antennas by a second separation distance that is longer than the first separation distance, and detecting the direction. The unit calculates a second direction angle based on the phase difference of the radio signals received through the first and second antennas having the second separation distance and the second separation distance. The method according to claim 5,
The direction detecting unit is closest to the first direction angle among the plurality of direction angles when there are a plurality of direction angles calculated based on the phase difference and the second separation distance of the radio signals received through the first and second antennas. And calculating a direction angle as the second direction angle. The method according to claim 1,
The direction detector may determine whether to improve the accuracy based on the calculated direction angle, and when the precision improvement is required, the separation control signal for setting the separation distance longer than the set separation distance. Direction detection device characterized in that provided to the drive control unit. The method according to claim 1,
The direction detecting unit detects,
A phase difference detector for detecting a phase difference of radio signals received from the first and second antennas, respectively; And
And a direction angle calculator configured to calculate the direction angle based on the detected phase difference and the set separation distance. In the direction detection method of the radio wave transmitter,
Moving at least one of the two antennas such that the distance between the two antennas is a first separation distance;
Calculating a first direction angle of the received signals based on a phase difference between the signals received through the two antennas and the first separation distance;
Moving at least one of the two antennas such that the distance between the two antennas is a second separation longer than the first separation; And
Calculating a second direction angle of the received signals based on a phase difference between the signals received through the two antennas having the second separation distance and the second separation distance, respectively; . The method according to claim 9,
The direction detection method of the radio wave transmitter,
When there are a plurality of direction angles of the received signals calculated based on the phase difference between the signals received through the two antennas having the second separation distance and the second separation distance, the direction angle among the plurality of direction angles is determined. And determining the direction angle closest to the first direction angle as the second direction angle. The method according to claim 9,
The direction detection method of the radio wave transmitter,
After calculating the second direction angle, determining whether an accuracy of the direction angle is necessary based on the calculated direction angle;
Moving the at least one of the two antennas so that the distance between the two antennas becomes a third separation distance longer than the second separation distance when the accuracy of the direction angle needs to be improved; And
Calculating a third direction angle of the received signals based on a phase difference between the signals received through the two antennas having the third separation distance and the third separation distance, respectively; Way The method of claim 11,
Computing the third direction angle,
When there are a plurality of direction angles of the received signals calculated based on the phase difference between the signals received through the two antennas having the third separation distance and the third separation distance, And determining the direction angle closest to the second direction angle as the third direction angle. The method according to claim 9,
The first distance is set to less than half of the wavelength of the received signal, the second distance is set to have a longer distance than the first distance, but each through two antennas having the second distance When there are a plurality of direction angles of the received signals calculated based on the phase difference between the received signals and the second separation distance, a distance within a range in which the direction angle can be calculated using the direction angle closest to the first direction angle. The direction detecting method of the radio wave transmission source characterized in that it is set to.
KR1020130027804A 2012-04-17 2013-03-15 Apparatus for finding direction of radio signal transmitting source and method therefor KR20130117664A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101478642B1 (en) * 2014-06-12 2015-01-02 국방과학연구소 System for localizing signal source and method thereof
KR101712382B1 (en) * 2016-11-01 2017-03-06 한국해양과학기술원 Antenna apparatus for dynamic test for verification of navigational data
KR20170058110A (en) * 2015-11-18 2017-05-26 한국전자통신연구원 Variable antenna and apparatus for detecting radio signal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101478642B1 (en) * 2014-06-12 2015-01-02 국방과학연구소 System for localizing signal source and method thereof
KR20170058110A (en) * 2015-11-18 2017-05-26 한국전자통신연구원 Variable antenna and apparatus for detecting radio signal
KR101712382B1 (en) * 2016-11-01 2017-03-06 한국해양과학기술원 Antenna apparatus for dynamic test for verification of navigational data

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