KR102159269B1 - Method and apparatus for detecting signal direction using uniform circular array antennas - Google Patents

Abstract

A method of detecting a signal direction of a circular array antenna according to an embodiment of the present invention includes the steps of receiving a signal, and each of a plurality of reference lines connecting two adjacent antennas in a circular array antenna including at least three antennas. Estimating a phase difference for a signal; selecting a reference line whose absolute value of the calculated phase difference is the minimum among the plurality of reference lines; and calculating a relative aberration angle of the signal with respect to the selected reference line; and When the calculated relative azimuth angles are plural, calculating a phase difference magnitude order of the signal with respect to the plurality of reference lines, calculating an azimuth angle of the signal for each of the calculated relative azimuth angles, and the calculated phase difference magnitude And determining a final azimuth angle indicating a direction of the signal from among the calculated plurality of azimuth angles based on determining whether the order corresponds to a pre-stored phase difference magnitude order.

Description

Signal direction detection method and device using circular array antenna {METHOD AND APPARATUS FOR DETECTING SIGNAL DIRECTION USING UNIFORM CIRCULAR ARRAY ANTENNAS}

The present invention relates to a method and apparatus for detecting the direction of a signal incident on an antenna arranged in a circle.

A signal direction detection apparatus for detecting a direction of a signal from a signal source may detect a direction in which a signal is incident by calculating an azimuth angle of a signal using a circular array antenna including a plurality of antennas arranged in a circle.

More specifically, the signal direction detection apparatus detects the direction by calculating the azimuth angle using the phase difference of the signal received by the circular array antenna. To this end, an antenna pair for setting a reference line that is a reference for comparing the phase difference among a plurality of antennas. Is required. However, in this case, in order to select an antenna pair, the signal direction detection device must have both an amplitude comparison circuit for comparing the amplitude of the signal and a phase difference comparison circuit for accurately measuring the azimuth angle, so that the size of the circular array antenna increases. There is a problem that the design becomes complicated.

In some cases, the signal direction detection device generates azimuth ambiguity in which two directions are calculated for one signal. For example, even if the signal is actually received at 45°, the direction detected by the circular array antenna is 45°, and the direction of 225° plus 180° to 45°, that is, two directions can be detected.

In this case, the signal direction detection apparatus includes an additional antenna for removing azimuth ambiguity in addition to the antenna used for signal detection, and compares the azimuth angles measured by several antenna pairs to calculate the final signal direction.

In other words, the current circular array antenna requires an amplitude comparison circuit, a phase difference comparison circuit, and an additional antenna in order to more accurately measure the direction of a signal, which complicates the design and increases its size. Accordingly, there is a need for a method for more efficiently and accurately detecting the direction of a signal without an additional device (eg, an additional antenna) or a complicated design for a circular array antenna.

Korean Patent Publication No. 10-2016-0029616 (published on March 15, 2016)

The problem to be solved by the present invention is to provide a signal direction detection apparatus of a circular array antenna that more efficiently and accurately detects the direction of a signal without additional devices or complicated design.

However, the problems to be solved by the present invention are not limited as mentioned above, and are not mentioned, but include objects that can be clearly understood by those of ordinary skill in the art from the following description. can do.

A method for detecting a signal direction according to an embodiment of the present invention includes the steps of receiving a signal, and a phase difference for the signal of each of a plurality of reference lines connecting two adjacent antennas in a circular array antenna including at least three antennas. Estimating, selecting a reference line at which an absolute value of the calculated phase difference is the minimum among the plurality of reference lines, calculating a relative aberration angle of the signal with respect to the selected reference line, and the calculated relative aberration angle In the case of a plurality of, the steps of calculating a phase difference magnitude order of the signal with respect to the plurality of reference lines, calculating an azimuth angle of the signal for each of the calculated relative azimuth angles, and pre-stored the calculated phase difference magnitude order And determining a final azimuth angle indicating a direction of the signal from among the calculated azimuth angles based on determining whether the order of the phase difference magnitude corresponds.

In addition, when the number of the plurality of antennas included in the circular array antenna is n, the plurality of antennas are arranged at regular intervals, identification numbers from 1 to n are sequentially assigned, and the phase difference is each of the plurality of reference lines. Is calculated for each of the plurality of reference lines based on the length of, the wavelength of the signal, the magnitude of the azimuth angle of the signal, and the identification number of each of the plurality of antennas, and the relative azimuth angle is the phase difference, the wavelength of the signal, and the It is calculated based on the length of the baseline.

In addition, the determining of the final azimuth angle includes information on the number of the plurality of reference lines, an azimuth range related to each of the plurality of reference lines generated based on the length of the reference line, and the order of the phase difference magnitude for each azimuth range. Based on the database, it is determined whether the calculated phase difference magnitude order corresponds to a previously stored phase difference magnitude order.

In addition, the determining of the final azimuth angle may include determining an azimuth range corresponding to the calculated phase difference magnitude order based on information on the order of the phase difference magnitude for each azimuth angle range in the database, and among the calculated azimuth angles And determining an azimuth angle included in the determined azimuth angle range as a final azimuth angle indicating the direction of the signal.

In addition, the reference line is a virtual line connecting the two antennas.

The signal direction detection apparatus according to an embodiment of the present invention includes a receiver for receiving a signal, and a phase difference for the signal of each of a plurality of reference lines connecting two adjacent antennas in a circular array antenna including at least three antennas. A phase difference absolute value calculation unit that calculates a phase difference; a reference line selection unit that selects a reference line whose absolute value of the calculated phase difference is the minimum among the plurality of reference lines; and a relative azimuth angle that calculates a relative azimuth angle of the signal with respect to the selected reference line. A calculation unit, a phase difference magnitude order calculator that calculates a phase difference magnitude order of the signal with respect to the plurality of reference lines when the calculated counterpart angularity is plural, and the calculated phase difference magnitude order corresponds to a pre-stored phase difference magnitude order Based on determining whether or not, based on calculating the azimuth angle of the signal for each of the calculated plurality of counterpart azimuth angles, and determining whether the calculated phase difference magnitude order corresponds to a pre-stored phase difference magnitude order, the And a final azimuth angle determination unit indicating the direction of the signal among the calculated azimuth angles.

In addition, when the number of a plurality of antennas included in the circular array antenna is n, the plurality of antennas are arranged at regular intervals, and identification numbers from 1 to n are sequentially assigned, and the phase difference is each of the plurality of reference lines. The length, the wavelength of the signal, the magnitude of the azimuth angle of the signal, and the identification number of each of the plurality of antennas are calculated for each of the plurality of reference lines, and the relative azimuth angle is the phase difference, the wavelength of the signal, and the reference line Is calculated based on the length of.

In addition, the final azimuth angle determination unit includes a database including information on the number of the plurality of reference lines, an azimuth range related to each of the plurality of reference lines generated based on the length of the reference line, and the order of the phase difference magnitude for each azimuth range And, based on the database, it is determined whether the calculated phase difference magnitude order corresponds to a previously stored phase difference magnitude order.

In addition, the final azimuth angle determination unit determines an azimuth range corresponding to the calculated phase difference magnitude order based on information on the order of the phase difference magnitudes for each azimuth angle range in the database, and within the determined azimuth angle range among the calculated azimuth angles. The included azimuth angle is determined as the final azimuth angle indicating the direction of the signal.

In addition, the reference line is a virtual line connecting the two antennas.

The apparatus and method for detecting a signal direction according to an exemplary embodiment of the present invention can easily select a reference line as a reference for phase difference comparison without an additional device or complicated design, and can more effectively and accurately detect the direction of a signal.

However, the effects obtainable in the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those of ordinary skill in the art from the following description. I will be able to.

1 shows a conceptual diagram of a circular array antenna according to an embodiment of the present invention.
2 shows an example of a functional configuration of a signal direction detection apparatus according to an embodiment of the present invention.
3 shows an example of the flow of each step of a method for detecting a signal direction according to an embodiment of the present invention.
4 shows an example of information included in a database of a method for detecting a signal direction according to an embodiment of the present invention.
5 illustrates another example of information included in a database of a method for detecting a signal direction according to an embodiment of the present invention.
6 illustrates another example of information included in a database of a method for detecting a signal direction according to an embodiment of the present invention.

Advantages and features of the present invention, and a method of achieving them will become apparent with reference to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various forms, and only these embodiments make the disclosure of the present invention complete, and those skilled in the art to which the present invention pertains. It is provided to fully inform the person of the scope of the invention, and the scope of the invention is only defined by the claims.

In describing the embodiments of the present invention, detailed descriptions of known functions or configurations will be omitted except when actually necessary in describing the embodiments of the present invention. In addition, terms to be described later are terms defined in consideration of functions in an embodiment of the present invention, which may vary according to the intention or custom of users or operators. Therefore, the definition should be made based on the contents throughout this specification.

Since the present invention can make various changes and include various embodiments, specific embodiments will be illustrated in the drawings and described in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, and should be understood as including all changes, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including an ordinal number such as first and second may be used to describe various elements, but the corresponding elements are not limited by these terms. These terms are only used for the purpose of distinguishing one component from another.

When a component is referred to as being'connected' or'connected' to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be.

1 shows a conceptual diagram of a uniform circular array (UCA) antenna according to an embodiment of the present invention.

Referring to FIG. 1, the circular array antenna 10 may include a plurality of antennas. More specifically, the circular array antenna 10 may include a first antenna 11, a second antenna 12, a third antenna 13, a fourth antenna 14, and a fifth antenna 15. . Hereinafter, the description will be made on the assumption that there are five antennas in the present specification, but the present invention is not limited thereto, and for example, three or more antennas may be included.

The first antenna 11, the second antenna 12, the third antenna 13, the fourth antenna 14, and the fifth antenna 15 are each at a predetermined distance (L) (or a predetermined angle). It has a spacing, but can be arranged in a circular shape.

Two antennas located at adjacent distances may form an antenna pair (or antenna pair). The virtual line connecting the pair of antennas may be referred to as a reference line. According to FIG. 1, the reference line may be a solid line connecting two adjacent antennas. The azimuth angle of the signal received (or incident) on the circular array antenna 10 may be calculated based on a vertical azimuth angle perpendicular to the reference line.

More specifically, the antenna pair includes a first antenna 11 and a second antenna 12, a second antenna 12 and a third antenna 13, and a third antenna 13 and a fourth antenna 14. , It may be formed of the fourth antenna 14 and the fifth antenna 15, the fifth antenna 15 and the first antenna 11. Accordingly, the reference line is a first reference line 21 connecting the first antenna 11 and the second antenna 12, and a second reference line 22 connecting the second antenna 12 and the third antenna 13 , A third reference line 23 connecting the third antenna 13 and the fourth antenna 14, a fourth reference line 24 connecting the fourth antenna 14 and the fifth antenna 15, and a fifth antenna It may include a fifth reference line 25 including 15 and the first antenna 11.

, 제2 기준선(22)에 대한 수직방위각은

, 제3 기준선(23)에 대한 수직방위각은

, 제4 기준선(24)에 대한 수직방위각

, 제5 기준선(25)에 대한 수직방위각은

일 수 있다.In addition, the vertical azimuth angle with respect to the first reference line 21 is

, The vertical azimuth angle with respect to the second reference line 22 is

, The vertical azimuth angle with respect to the third reference line (23) is

, Vertical azimuth angle with respect to the fourth reference line (24)

, The vertical azimuth angle with respect to the fifth reference line (25) is

Can be

, 제2 기준선(22)에 대한 위상차는

, 제3 기준선(23)에 대한 위상차는

, 제4 기준선(24)에 대한 위상차는

, 제5 기준선(25)에 대한 위상차는

일 수 있다. Although described later, a phase difference may be calculated based on each reference line for one signal received by the circular array antenna 10 in order to detect a signal direction. For example, the phase difference with respect to the first reference line 21 is

, The phase difference with respect to the second reference line 22 is

, The phase difference with respect to the third reference line 23 is

, The phase difference with respect to the fourth reference line 24 is

, The phase difference with respect to the fifth reference line 25 is

Can be

2 shows an example of a functional configuration of a signal direction detection apparatus according to an embodiment of the present invention. Used below'… A term such as'unit' refers to a unit that processes at least one function or operation, which may be implemented by hardware or software, or a combination of hardware and software. Hereinafter, in FIG. 2, a detailed description of a signal direction detection apparatus will be given based on the contents described in FIG. 1.

Referring to FIG. 2, the signal direction detection apparatus 100 includes a receiving unit 110, a phase difference absolute value calculation unit 120, a reference line selection unit 130, a relative position angle calculation unit 140, and a phase difference magnitude order calculation unit 150. ), may include a final azimuth angle determination unit 160.

The receiving unit 110 may receive a signal from a signal source. More specifically, the receiving unit 110 may receive a signal incident from a specific direction through the circular array antenna 10. Here, the circular array antenna 10 may include at least three antennas, as described above with reference to FIG. 1, and the three or more antennas are arranged in a circular shape with a predetermined interval, so that in the range of 0 to 360° Can receive signals.

The phase difference absolute value calculation unit 120 may calculate a phase difference of a signal with respect to each of a plurality of reference lines of the circular array antenna 10. The plurality of reference lines may include, for example, a first reference line 21, a second reference line 22, a third reference line 23, a fourth reference line 24, and a fifth reference line 25. More specifically, the phase difference absolute value calculation unit 120 calculates a phase difference for each signal of a plurality of reference lines connecting two adjacent antennas in the circular array antenna 10, and calculates an absolute value for each of the calculated phase differences. Can be calculated.

방위각에서 입사하는 신호의 위상차를 산정할 수 있다. The phase difference absolute value calculation unit 120 is based on Equation 1 below.

The phase difference of the incident signal at the azimuth can be calculated.

는 제k 기준선에 대한 신호의 위상차,

는 수신된 신호의 파장, L은 기준선의 길이(즉, 제k 안테나와 제k+1 안테나 사이의 거리),

는 수신(입사)되는 신호의 방위각일 수 있다. 즉, 위상차는 복수의 기준선 각각의 길이, 수신된 신호의 파장, 수신된 신호의 방위각의 크기, 복수의 안테나 각각의 식별번호에 기초하여, 복수의 기준선 각각에 대해 산정될 수 있다. In Equation 1, k is an identification number of an antenna. More specifically, k may be a number entering k in the kth antenna of FIG. 1.

Is the phase difference of the signal with respect to the kth baseline,

Is the wavelength of the received signal, L is the length of the reference line (that is, the distance between the kth antenna and the k+1th antenna),

May be the azimuth angle of the received (incident) signal. That is, the phase difference may be calculated for each of the plurality of reference lines based on the length of each of the plurality of reference lines, the wavelength of the received signal, the size of the azimuth angle of the received signal, and identification numbers of each of the plurality of antennas.

The phase difference absolute value calculation unit 120 may calculate a phase difference for each of the plurality of reference lines and calculate an absolute value for each of the calculated phase differences.

The reference line selector 130 may select a reference line whose absolute value of the calculated phase difference is the minimum among the plurality of reference lines. The selected reference line may be a reference line used to determine the azimuth angle of the signal, and may be referred to as an activity reference line in some cases.

Meanwhile, the selection of the reference line may be performed in consideration of an azimuth error. The azimuth error may be calculated through Equation 2 below.

는 방위각 오차,

는 제k 기준선에 대한 신호의 위상차,

는 수신된 신호의 파장, L은 기준선의 길이,

는 신호의 방위각일 수 있다. In Equation 2,

Is the azimuth error,

Is the phase difference of the signal with respect to the kth baseline,

Is the wavelength of the received signal, L is the length of the baseline,

May be the azimuth angle of the signal.

이 1에 가까울수록 방위각 정확도가 향상될 수 있다. 이에 따라, 기준선은

가 0에 가까운 것 즉, 기준선의 위상차 절대값이 최소가 되는 기준선으로 선택될 수 있다. On the other hand, referring to Equation 2, the azimuth error is the longer the length of the reference line, the more the signal is incident in the vertical vicinity of the reference line, that is,

The closer this is to 1, the better the azimuth accuracy can be. Accordingly, the baseline is

Is close to 0, that is, the reference line at which the absolute value of the phase difference of the reference line is minimum may be selected.

The counterpart aberration calculation unit 140 may calculate the counterpart aberration with respect to the received signal and the selected reference line. The counterpart aberration calculation unit 140 may calculate the counterpart aberration based on Equation 3 below.

는 상대방위각,

는 최소 위상차 절대값,

는 수신된 신호의 파장, L은 기준선의 길이일 수 있다. 즉, 상대방위각은 최소위상차, 수신된 신호의 파장, 활동 기준선으로 선택된 기준선의 길이에 기초하여 산출될 수 있다. In Equation 3,

Is the opponent's delinquency,

Is the absolute minimum phase difference,

May be the wavelength of the received signal, and L may be the length of the reference line. That is, the relative aberration angle may be calculated based on the minimum phase difference, the wavelength of the received signal, and the length of the reference line selected as the activity reference line.

On the other hand, in some cases, the counterpart deferral angle calculation unit 140 may calculate two or more counterpart deferral angles. For example, the counterpart aberration angle calculator 140 may calculate 30° and 210° as the counterpart aberration angle of the signal. In this case, it can be determined that azimuth ambiguity has occurred.

On the other hand, even if the calculated counterpart azimuth angles are two, since the actual azimuth angle of the received signal is one, it is necessary to remove the azimuth ambiguity in order to detect the correct direction of the signal. In other words, it is necessary to determine the final relative azimuth angle to be used in the calculation of the actual azimuth through the removal of the azimuth ambiguity that removes the false relative azimuth. Hereinafter, a configuration related to removing the azimuth ambiguity will be described.

The phase difference magnitude order calculation unit 150 may calculate the magnitude order of the phase difference for each of the plurality of reference lines of the signal received by the reception unit 110 when the calculated counterpart azimuth angle is plural. More specifically, the phase difference magnitude order calculation unit 150 may determine whether an azimuth ambiguity has occurred, and if the calculated relative azimuth angle is plural, it may determine that the azimuth ambiguity has occurred. When the azimuth ambiguity occurs, the phase difference magnitude order calculation unit 150 may calculate the magnitude order of the phase difference for each of a plurality of reference lines of a signal received by the reception unit 110.

In some cases, the phase difference magnitude order calculating unit 150 may arrange each of the plurality of reference lines in an order of increasing or decreasing the magnitude of the phase difference based on the magnitude of the phase difference. The listed information may be stored in the phase difference magnitude order calculator 150, and may be used to determine whether it corresponds to a pre-stored phase difference magnitude order of the final azimuth angle determiner 160 to be described later.

The final azimuth angle determination unit 160 calculates a final azimuth angle indicating the direction of the received signal among the calculated azimuth angles based on determining whether the order of the phase difference magnitude calculated for each of the plurality of reference lines corresponds to a pre-stored phase difference magnitude order. You can decide.

) 과 산출된 상대방위각을 더하여 수신된 신호의 방위각을 산출할 수 있다. 산출된 상대방위각이 복수인 경우, 최종방위각 결정부(160)는 신호에 대한 복수의 방위각을 산출할 수 있다. More specifically, the final azimuth angle determination unit 160 may calculate an azimuth angle for each of the calculated relative azimuth angles. The final azimuth angle determination unit 160 is the vertical azimuth angle of the selected reference line (or activity reference line) (for example, in FIG. 1 ).

) And the calculated counterpart azimuth angle to calculate the azimuth angle of the received signal. When the calculated relative azimuth angles are plural, the final azimuth angle determination unit 160 may calculate a plurality of azimuth angles for the signal.

The final azimuth angle determination unit 160 includes a database including information on an azimuth range related to each of the plurality of reference lines generated based on the number of reference lines and the length of the reference line, and the order of the phase difference magnitude for each azimuth range. Can include. For specific examples related to the database, refer to FIGS. 4 to 6.

The final azimuth angle determiner 160 may determine whether the calculated phase difference magnitude order corresponds to a previously stored phase difference magnitude order based on the database. Meanwhile, the order of the pre-stored phase difference magnitude may be mapped to the azimuth range. The final azimuth angle determiner 160 may determine an azimuth angle corresponding to a pre-stored phase difference magnitude order among the calculated azimuth angles, that is, included in an azimuth angle range mapped to the pre-stored phase difference magnitude order, as the final azimuth angle.

On the other hand, if the phase difference magnitude order calculation unit 150 determines that the azimuth ambiguity does not occur, the final azimuth angle determination unit 160 may calculate the final azimuth angle by adding the vertical azimuth angle of the selected reference line to the calculated relative azimuth angle.

3 shows an example of the flow of each step of a method for detecting a signal direction according to an embodiment of the present invention. Hereinafter, a description will be made based on the configuration of the signal direction detection apparatus of FIG. 2, and it is a matter of course that each step of the method shown in FIG. 3 may be performed in a different order as shown in the drawings depending on the case.

Referring to FIG. 3, the receiver 110 may receive a signal (S110). The reception unit 110 may receive a signal received from an arbitrary direction through the circular array antenna 10.

The phase difference absolute value calculation unit 120 may calculate an absolute value of a phase difference for each signal of a plurality of reference lines of the circular array antenna 10 (S120). More specifically, the phase difference absolute value calculation unit 120 may calculate a phase difference for a signal based on each of a plurality of reference lines. Accordingly, a phase difference for each of the plurality of reference lines may be calculated. The phase difference absolute value calculation unit 120 may calculate an absolute value for each of the calculated phase differences.

The reference line selector 130 may select a reference line having a minimum absolute value of the phase difference in relation to the absolute value of the phase difference of each of the plurality of reference lines (S130).

The counterpart aberration calculation unit 140 may calculate the counterpart aberration with respect to the selected reference line (S140). In this case, the calculated counterpart aberration angle may be two or more, and in this case, the phase difference magnitude order calculator 150 may calculate an order of magnitude of the phase difference for each of a plurality of reference lines of the received signal (S150).

In some cases, the phase difference magnitude order calculating unit 150 may arrange each of the plurality of reference lines in an order of increasing or decreasing the magnitude of the phase difference based on the magnitude of the phase difference. The listed information may be stored in the phase difference magnitude order calculator 150, and may be used to determine whether it corresponds to a pre-stored phase difference magnitude order of the final azimuth angle determiner 160 to be described later.

The final azimuth angle determination unit 160 calculates the azimuth angle of the signal for each of the calculated counterpart azimuth angles, and is calculated based on determining whether the calculated phase difference magnitude order for each of the plurality of reference lines corresponds to a pre-stored phase difference magnitude order. It is possible to determine a final azimuth angle indicating the direction of the signal among the azimuth angles (S160).

More specifically, the final azimuth angle determination unit 160 is based on a database including information on an azimuth range related to each of the plurality of reference lines and the order of the phase difference magnitude for each azimuth range, the calculated phase difference magnitude order is pre-stored phase difference magnitude It can be determined whether it corresponds to the order. Here, the database may be generated based on the number of reference lines and the length of the reference lines. That is, the database may include information on an azimuth range related to each of the plurality of reference lines and an order of a phase difference magnitude for each azimuth range according to the number of reference lines and the length of the reference line. For a more detailed description of the database, refer to FIGS. 4 to 6.

The final azimuth angle determiner 160 may determine an azimuth range corresponding to the calculated phase difference magnitude order based on information on the order of the phase difference magnitude for each azimuth angle range in the database (S160). The final azimuth angle determiner 160 may determine an azimuth angle included within the determined azimuth range among the calculated azimuth angles as the final azimuth angle indicating the direction of the signal.

4 to 6 illustrate examples of information included in a database of a method for detecting a signal direction according to an embodiment of the present invention.

인 경우, 5개의 기준선 각각의 위상차의 크기를 나타낸다. 또한, 도 4는 위상차 절대값이 최소인 기준선을 이용하여 a부터 k까지, 즉 11개의 구간으로 나뉘어진 방위각의 범위를 나타낸다. 4 shows the length of the reference line

In the case of, it represents the magnitude of the phase difference of each of the five reference lines. In addition, FIG. 4 shows a range of azimuth angles from a to k, that is, divided into 11 sections using a reference line having a minimum absolute value of the phase difference.

More specifically, referring to FIG. 4, the blue line is for the first reference line 21, and the antenna array from the second reference line 22 to the fifth reference line 25 sequentially starting from the first reference line 21 It can be seen that a sine-shaped graph shifted by the angle of is displayed.

In the graph of FIG. 4, an azimuth angle in the range of 0 to 360° appearing on the x-axis may be classified according to a reference line in which the absolute value of the phase difference is the minimum. That is, the area of the graph of FIG. 4 may be divided by grouping the same azimuth angles of the reference line at which the absolute value of the phase difference is minimum. For example, the azimuth range in which the first reference line 21 is the azimuth range where the absolute value of the phase difference is the minimum is the a, f, and k area, and the azimuth angle is the second reference line 22 where the absolute value of the phase difference is the minimum The range may be the c and h regions.

5 shows an example of a database in which the graph of FIG. 4 is arranged in a table format. More specifically, FIG. 5 shows reference line numbers and measurement azimuth angles for each divided area of FIG. 4. The measured azimuth angle may be a range of an azimuth angle that the received signal can have when the selected reference line matches the reference line number.

6 shows an example of an order of magnitude of a phase difference for each region of FIGS. 4 and 5. Referring to FIG. 6, the order of the magnitude of the phase difference in the region a may be 5-4-1-3-2, and the order of the magnitude of the phase difference in the region b is 5-1-4-2-3.

인 경우의 각 구간에서의 위상차 크기 순서를 나타내는 것일 수 있다. Meanwhile, the database described with reference to FIGS. 4 to 6 may vary depending on the number of antennas or the length of the reference line. For example, in FIG. 6, a plurality of antennas included in the circular array antenna 10 are 5, and the length of the reference line is

It may indicate the order of the magnitude of the phase difference in each section in the case of.

를 초과하는 경우, 방위각 추정을 위해 이용되는 데이터베이스는 도 4 내지 도 6과 달라질 수 있다. 다양한 경우에 대한 도 4 내지 도 6의 형태로 나타나는 정보는 데이터베이스에 미리 저장되어 있을 수 있다. If there are 7 antennas, the length of the reference line is

If exceeds, the database used for the azimuth estimation may be different from FIGS. 4 to 6. Information shown in the form of FIGS. 4 to 6 for various cases may be previously stored in a database.

In more detail in this regard, the database may include various information on the order of the phase difference magnitude according to the number of antennas included in the circular array antenna 10 and the length of the reference line. Such a database may be generated using a sine graph shifted based on an array angle of a plurality of antennas included in the circular array antenna 10 and a reference line determined using a phase difference. The database created in this way may be previously stored in the final azimuth angle determination unit 160.

The final azimuth angle determiner 160 may determine the final azimuth angle by using the phase difference magnitude order calculated by the phase difference magnitude order calculator 150 and a database as described with reference to FIGS. 4 to 6.

More specifically, the case where the database of FIGS. 4 to 6 is applied will be described as an example. First, the reference line selected by the reference line selection unit 130 is 1, the order of the phase difference magnitude calculated by the phase difference magnitude order calculator 150 is 5-4-1-3-2, and the final azimuth angle determination unit 160 It can be assumed that the azimuth angles calculated by) are 10° and 190°.

In this case, the final azimuth angle determiner 160 may determine a region corresponding to the phase difference magnitude order 5-4-1-3-2 as a region a or a k region through FIG. 6. Thereafter, the final azimuth angle determination unit 160 can identify that the azimuth angle in the range a is 0-18°, and the azimuth angle in the k range is 342-360° through FIG. 5. Based on this, the final azimuth angle determination unit 160 may determine the final azimuth angle of the received signal as 10° because the azimuth angle that satisfies the database is 10° among 10° and 190°.

The signal direction detection apparatus 100 according to an embodiment of the present invention selects a reference line using an absolute value of a phase difference, thereby improving ease and efficiency for selection of a reference line. In addition, it is economical because a complicated design or additional hardware configuration is not required in relation to the selection of a reference line for signal direction detection, and the size of an area in which the signal direction detection apparatus 100 is installed can be minimized.

In addition, the signal direction detection apparatus 100 according to an embodiment of the present invention removes the azimuth ambiguity using a database including information on the phase difference magnitude order, so that an additional hardware element, for example an antenna, is not added. It is economical by avoiding it, and the size of the area in which the signal direction detection device 100 is installed can be minimized.

Combinations of each block in the block diagram attached to the present specification and each step in the flowchart may be performed by computer program instructions. Since these computer program instructions can be mounted on the processor of a general-purpose computer, special purpose computer or other programmable data processing equipment, the instructions executed by the processor of the computer or other programmable data processing equipment are displayed in each block or flowchart of the block diagram. Each step creates a means to perform the functions described. These computer program instructions can also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory It is also possible to produce an article of manufacture in which the instructions stored in the block diagram contain instruction means for performing the functions described in each block of the block diagram or each step of the flowchart. Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operating steps are performed on a computer or other programmable data processing equipment to create a computer-executable process to create a computer or other programmable data processing equipment. It is also possible for the instructions to perform the processing equipment to provide steps for performing the functions described in each block of the block diagram and each step of the flowchart.

In addition, each block or each step may represent a module, segment, or part of code comprising one or more executable instructions for executing the specified logical function(s). In addition, it should be noted that in some alternative embodiments, functions mentioned in blocks or steps may occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially simultaneously, or the blocks or steps may sometimes be performed in the reverse order depending on the corresponding function.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains will be able to make various modifications and variations without departing from the essential quality of the present invention. Accordingly, the embodiments disclosed in the present specification are not intended to limit the technical idea of the present disclosure, but to explain the technical idea, and the scope of the technical idea of the present disclosure is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

10: circular array antenna
100: signal direction detection device
110: receiver
120: phase difference absolute value calculation unit
130: baseline selection unit
140: counterpart aberration calculation unit
150: phase difference magnitude order calculation unit
160: final azimuth angle determination unit

Claims (10)

Receiving a signal,
Calculating a phase difference of the signal of each of a plurality of reference lines connecting two adjacent antennas in a circular array antenna including at least three antennas,
Selecting a reference line in which the absolute value of the calculated phase difference is the minimum among the plurality of reference lines; and
Calculating a counterpart azimuth angle for determining whether an azimuth ambiguity of the signal with respect to the selected reference line occurs;
If the calculated relative azimuth angle is singular, it is determined that the azimuth ambiguity has not occurred, if the calculated relative azimuth angle is plural, it is determined that the azimuth ambiguity has occurred, and the magnitude of the phase difference with respect to the plurality of reference lines of the signal The steps of calculating the sequence, and
When the calculated relative azimuth angles are plural, a plurality of azimuth angles for the signal are calculated for each of the calculated relative azimuth angles, and the signal among the plurality of azimuth angles calculated based on the calculated phase difference magnitude order Including the step of determining the final azimuth angle indicating the direction,
The relative aberration angle of the signal with respect to the selected baseline is,
It is calculated based on the azimuth angle of the selected reference line and the azimuth angle of the signal.
Signal direction detection method. The method of claim 1,
When the number of the plurality of antennas included in the circular array antenna is n, the plurality of antennas are arranged at regular intervals, and identification numbers from 1 to n are sequentially assigned,
The phase difference is calculated for each of the plurality of reference lines, based on the length of each of the plurality of reference lines, the wavelength of the signal, the magnitude of the azimuth angle of the signal, and identification numbers of each of the plurality of antennas,
The relative aberration angle is calculated based on the phase difference, the wavelength of the signal, and the length of the reference line.
Signal direction detection method. The method of claim 1,
The determining of the final azimuth angle comprises: a database including information on the number of the plurality of reference lines, an azimuth range related to each of the plurality of reference lines generated based on the length of the reference line, and the order of the phase difference magnitude for each azimuth range Based on, determining whether the calculated phase difference magnitude order corresponds to a pre-stored phase difference magnitude order
Signal direction detection method. The method of claim 3,
The step of determining the final azimuth angle,
Determining an azimuth range corresponding to the calculated phase difference magnitude order based on information on the order of the phase difference magnitude for each azimuth angle range in the database; and
Including the step of determining an azimuth angle included in the determined azimuth range among the calculated azimuth angles as a final azimuth angle indicating the direction of the signal
Signal direction detection method. The method of claim 1,
The reference line is a virtual line connecting the two antennas
Signal direction detection method. A receiver for receiving a signal,
A phase difference absolute value calculation unit for calculating a phase difference for the signal of each of a plurality of reference lines connecting two adjacent antennas in a circular array antenna including at least three antennas,
A reference line selection unit for selecting a reference line at which the absolute value of the calculated phase difference is the minimum among the plurality of reference lines;
A counterpart aberration angle calculator for calculating a counterpart aberration angle for determining whether an azimuth ambiguity of the signal with respect to the selected reference line occurs;
When the calculated counterpart azimuth angle is singular, it is determined that the azimuth ambiguity has not occurred, when the calculated counterpart azimuth angle is plural, it is determined that the azimuth ambiguity has occurred, and the magnitude of the phase difference of the signal with respect to the plurality of reference lines A phase difference magnitude order calculator for calculating an order,
When the calculated relative azimuth angles are plural, a plurality of azimuth angles for the signal are calculated for each of the calculated relative azimuth angles, and the signal among the plurality of azimuth angles calculated based on the calculated phase difference magnitude order It includes a final azimuth angle determination unit indicating the direction,
The relative aberration angle of the signal with respect to the selected baseline is,
It is calculated based on the azimuth angle of the selected reference line and the azimuth angle of the signal.
Signal direction finding device. The method of claim 6,
When the number of a plurality of antennas included in the circular array antenna is n, the plurality of antennas are arranged at regular intervals and identification numbers from 1 to n are sequentially assigned,
The phase difference is calculated for each of the plurality of reference lines, based on the length of each of the plurality of reference lines, the wavelength of the signal, the magnitude of the azimuth angle of the signal, and identification numbers of each of the plurality of antennas,
The relative aberration angle is calculated based on the phase difference, the wavelength of the signal, and the length of the reference line.
Signal direction finding device. The method of claim 6,
The final azimuth angle determination unit includes a database including information on the number of the plurality of reference lines, an azimuth range related to each of the plurality of reference lines generated based on the length of the reference line, and the order of the phase difference magnitude for each azimuth range,
Based on the database, determining whether the calculated phase difference magnitude order corresponds to a previously stored phase difference magnitude order
Signal direction finding device. The method of claim 8,
The final azimuth angle determination unit,
Determine an azimuth range corresponding to the calculated phase difference magnitude order based on information on the order of the phase difference magnitude for each azimuth angle range in the database,
To determine the azimuth angle included in the determined azimuth range among the calculated azimuth angles as the final azimuth angle indicating the direction of the signal
Signal direction finding device. The method of claim 6,
The reference line is a virtual line connecting the two antennas
Signal direction finding device.

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