KR20200058842A - Method and apparatus for detecting signal direction using uniform circular array antennas - Google Patents

Abstract

A signal direction detecting method for a circular array antenna, according to an embodiment of the present invention, comprises the steps of: receiving a signal; calculating a phase difference of each of a plurality of reference lines, with respect to the signal, which connect two antennas adjacent to each other in a circular array antenna including at least three antennas; selecting, from among the plurality of reference lines, a reference line in which the absolute value of the calculated phase difference becomes the minimum; calculating the relative azimuth of the signal with respect to the selected reference line; calculating a phase difference size order of the signals with respect to the plurality of reference lines, when there are the plurality of calculated relative azimuths; and calculating the azimuth of the signal for each of the plurality of calculated relative azimuths, and determining, from among the plurality of calculated azimuths, a final azimuth which indicates the direction of the signal, on the basis of determining whether the calculated phase difference size order corresponds to a pre-stored phase difference size 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.

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

More specifically, the signal direction detection device detects a direction by calculating the azimuth using the phase difference of the signal received by the circular array antenna, and for this purpose, an antenna pair for setting a reference line that is a reference for phase difference comparison among a plurality of antennas The choice of is required. However, in this case, in order to select the 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 precisely measuring the azimuth, so the size of the circular array antenna increases. There is a problem that the design is 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 can be detected in 45 °, and 225 ° plus 180 ° plus 180 °, that is, two directions.

In this case, the signal direction detection apparatus is provided with 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, at present, in order to more accurately measure the direction of a signal in a circular array antenna, an amplitude comparison circuit, a phase difference comparison circuit, and an additional antenna are required, which has a disadvantage in that the design is complicated and the size thereof increases. 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 (released on March 15, 2016)

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

However, the problems to be solved by the present invention are not limited to those mentioned above, but are not mentioned, but include the purpose that can be clearly understood by those skilled in the art from the following description can do.

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

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, and identification numbers 1 to n are sequentially assigned, and the phase difference is each of the plurality of reference lines. Based on the length, the wavelength of the signal, the magnitude of the azimuth of the signal, the identification number of each of the plurality of antennas, is calculated for each of the plurality of reference lines, the counterpart angle is the phase difference, the wavelength of the signal, the It is calculated based on the length of the baseline.

In addition, the step of determining the final azimuth includes information on the number of the plurality of reference lines, the azimuth range associated with each of the plurality of reference lines generated based on the length of the reference line, and the order of the phase difference size for each azimuth range. Based on the database, it is determined whether the calculated phase difference magnitude order corresponds to a pre-stored phase difference magnitude order.

In addition, the determining of the final azimuth may include determining 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 range in the database, and among the calculated azimuth angles. And determining the azimuth included in the determined azimuth 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 phase difference for each signal of a plurality of reference lines connecting two antennas adjacent to each other in a circular array antenna including at least three antennas and a receiver for receiving a signal. A phase difference absolute value calculation unit for calculating a reference line, a reference line selection unit for selecting a reference line for which the absolute value of the calculated phase difference is minimum among the plurality of reference lines, and a counterpart angle for calculating a counterpart angle of the signal with respect to the selected reference line A calculation unit, a phase difference magnitude order calculation unit for calculating a phase difference magnitude order for the plurality of reference lines of the signal when the calculated counter-angle is plural, and the calculated phase difference magnitude order corresponds to a pre-stored phase difference magnitude order Based on determining whether or not, the azimuth angle of the signal for each of the calculated plurality of counterpart angles is calculated, and based on determining whether the calculated phase difference magnitude order corresponds to a previously stored phase difference magnitude order. And a final azimuth angle determination unit indicating the direction of the signal among the calculated azimuth angles.

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, and identification numbers 1 to n are sequentially assigned, and the phase difference is each of the plurality of reference lines. Based on the length, the wavelength of the signal, the magnitude of the azimuth of the signal, and the identification number of each of the plurality of antennas, it is calculated for each of the plurality of reference lines, and the counterpart angle is the phase difference, the wavelength of the signal, the reference line It is calculated based on the length of.

In addition, the final azimuth angle determining unit includes a database including information on the number of the plurality of reference lines, the azimuth range associated with each of the plurality of reference lines generated based on the length of the reference line, and the order of the phase difference size for each azimuth range. Then, based on the database, it is determined whether the calculated phase difference magnitude order corresponds to a pre-stored phase difference magnitude order.

In addition, the final orientation angle determining 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 range in the database, and within the determined azimuth range among the calculated azimuth angles. The included azimuth 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 signal direction detection apparatus and method according to an embodiment of the present invention can easily select a reference line that is a reference for a phase difference comparison without additional devices or complicated designs, and can more effectively and accurately detect the signal direction.

However, the effects that can be obtained in the present invention are not limited to the above-mentioned effects, and other effects that are not mentioned will be clearly understood by those skilled in the art from the following description. Will be able to.

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

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to 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 allow the disclosure of the present invention to be complete, and have ordinary knowledge 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 a user's or operator's intention or practice. Therefore, the definition should be made based on the contents throughout this specification.

The present invention can be applied to various changes and may include various embodiments, and 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 specific embodiments, and should be understood as including all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by these terms. These terms are only used to distinguish one component from another.

When a component is said to be 'connected' or 'connected' to another component, it is understood that other components may be directly connected to or connected to the other component, but other components may exist in the middle. It should be.

1 is 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, it will be described on the assumption that the plurality of antennas is five in the present specification, but is not limited thereto, and may include, for example, three or more antennas.

The first antenna 11, the second antenna 12, the third antenna 13, the fourth antenna 14, and the fifth antenna 15 each have a predetermined constant distance L (or a predetermined constant angle). It has a gap, but may 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 antenna pair 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) to 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 the first antenna 11 and the second antenna 12, the second antenna 12 and the third antenna 13, the third antenna 13 and the fourth antenna 14 , It may be formed of a fourth antenna 14 and a fifth antenna 15, a 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 , The third reference line 23 connecting the third antenna 13 and the fourth antenna 14, the fourth reference line 24 connecting the fourth antenna 14 and the fifth antenna 15, the fifth antenna 15 and a fifth reference line 25 including 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 orientation angle with respect to the first reference line 21 is

, The vertical orientation angle with respect to the second reference line (22)

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

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

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

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. As will be described later, a phase difference may be calculated based on each reference line for one signal received by the circular array antenna 10 for detection of the 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

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

Can be

Figure 2 shows an example of a functional configuration of a signal direction detection device according to an embodiment of the present invention. Used below… The term 'sub' means 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 the signal direction detection device will be provided based on the description of FIG. 1.

Referring to FIG. 2, the signal direction detection device 100 includes a receiving unit 110, a phase difference absolute value calculation unit 120, a reference line selection unit 130, a counterpart angle calculating unit 140, and a phase difference magnitude order calculating unit 150 ), The final orientation angle determining unit 160.

The receiver 110 may receive a signal from a signal source. More specifically, the receiver 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 three or more antennas are arranged in a circular shape with a predetermined interval to thereby range from 0 to 360 °. You can receive a signal.

The phase difference absolute value calculating unit 120 may calculate a phase difference of a signal for 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 calculating unit 120 calculates the phase difference for each signal of a plurality of reference lines connecting two antennas adjacent to each other in the circular array antenna 10, and calculates the 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 signal incident 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 the antenna. More specifically, k may be a number entering k in the k-th antenna of FIG. 1.

Is the phase difference of the signal with respect to the k-th reference line,

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

May be the azimuth angle of the signal received (incident). 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 magnitude of the azimuth of the received signal, and the identification numbers of each of the plurality of antennas.

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

On the other hand, the selection of the reference line may be taken into account of the azimuth error. The azimuth error can 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 k-th reference line,

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

May be the azimuth 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 enters the vertical vicinity of the reference line, that is,

The closer to 1, the more azimuth accuracy can be improved. Accordingly, the baseline

Is close to 0, that is, it can be selected as a reference line in which the absolute value of the phase difference of the reference line is minimum.

The counterpart angle calculation unit 140 may calculate the counterpart angle for the received signal and the selected reference line. The counterpart angle calculation unit 140 may calculate the counterpart angle 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 counterparty

Is the absolute minimum phase difference,

Is the wavelength of the received signal, L may be the length of the reference line. That is, the counterpart angle can 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, depending on the case, the counterpart angle calculation unit 140 may calculate two or more counterpart angles. For example, the counterpart angle calculation unit 140 may calculate 30 ° and 210 ° as the counterpart angle of the signal. In this case, it can be determined that azimuth ambiguity has occurred.

On the other hand, even if the calculated counter-angular angle is two, since the actual azimuth 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 to be used in the calculation of the actual azimuth through elimination of azimuth that removes the false counterpart. Hereinafter, a configuration related to removing the azimuth ambiguity will be described.

The phase difference magnitude order calculator 150 may calculate the magnitude order of the phase differences for each of the plurality of reference lines of the signal received by the receiver 110 when the calculated counter-angles are plural. More specifically, the phase difference magnitude order calculating unit 150 may determine whether azimuth ambiguity has occurred, and determine that azimuth ambiguity has occurred if the calculated counterparty angles are plural. When azimuth ambiguity occurs, the phase difference magnitude order calculator 150 may calculate the magnitude order of the phase differences for each of a plurality of reference lines of the signal received by the receiver 110.

In some cases, the phase difference magnitude order calculator 150 may list each of the plurality of reference lines in the order of large or small size of the phase difference based on the size 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 the pre-stored phase difference magnitude order of the final orientation angle determining unit 160 described later.

The final azimuth angle determination unit 160 determines a final azimuth angle indicating the direction of the received signal among the calculated azimuth angles based on determining whether the retardation magnitude order calculated for each of the plurality of reference lines corresponds to a previously stored retardation magnitude order. 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 counterpart angles. The final azimuth angle determining unit 160 is a vertical azimuth angle of the selected reference line (or activity reference line) (eg, in FIG. 1).

) And the calculated counterpart angle can be added to calculate the azimuth angle of the received signal. When the calculated counter-angularity is plural, the final azimuth angle determining 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 the number of a plurality of reference lines and the order of the azimuth ranges associated with each of the plurality of reference lines generated based on the lengths of the reference lines and the order of the phase difference sizes for each azimuth ranges. It can contain. 4 to 6 for specific examples related to the database.

The final orientation angle determining unit 160 may determine whether the calculated phase difference magnitude order corresponds to the pre-stored phase difference magnitude order based on the database. On the other hand, the pre-stored phase difference magnitude order may be mapped to the azimuth range. The final azimuth angle determination unit 160 may determine an azimuth angle corresponding to a pre-stored phase difference magnitude order among the calculated plurality of azimuth angles, that is, an azimuth angle included in an azimuth range mapped to the pre-stored phase difference magnitude order.

On the other hand, if it is determined that the phase difference magnitude order calculating unit 150 does not cause azimuth ambiguity, the final azimuth angle determination unit 160 may calculate the final azimuth angle by summing the vertical counter angle of the selected reference line to the calculated counter-azimuth angle.

Figure 3 shows an example of the flow of each step of the signal direction detection method according to an embodiment of the present invention. Hereinafter, the configuration of the signal direction detection device of FIG. 2 will be described as a reference, and it is needless to say that each step of the method illustrated in FIG. 3 may be performed in a different order as illustrated in the drawings.

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

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

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

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

In some cases, the phase difference magnitude order calculator 150 may list each of the plurality of reference lines in the order of large or small size of the phase difference based on the size 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 the pre-stored phase difference magnitude order of the final orientation angle determining unit 160 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 calculates it based on determining whether the calculated phase difference magnitude order for each of the plurality of reference lines corresponds to a previously stored phase difference magnitude order A final azimuth angle indicating the direction of the signal may be determined among the azimuth angles (S160).

More specifically, the final orientation angle determining unit 160 based on a database including information on the order of the phase difference magnitudes for each of the plurality of reference lines and the azimuth range and the azimuth range, the calculated phase difference magnitude order is prestored phase difference magnitude It can be determined whether or not it corresponds to the order. Here, the database may be generated based on the number of the plurality of reference lines and the length of the reference line. That is, the database may include information on the order of the azimuth range and the phase difference size for each azimuth range associated with each of the plurality of reference lines according to the number of the plurality of reference lines and the length of the reference lines. For more detailed descriptions related to the database, refer to FIGS. 4 to 6.

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

4 to 6 show examples of information included in a database of a signal direction detection method 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. Figure 4 is the length of the baseline

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 divided from a to k, that is, 11 sections using a reference line having a minimum absolute phase difference value.

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

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

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

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

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

In the case of, it may indicate an order of magnitude of phase difference in each section.

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

When it exceeds, the database used for 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 stored in advance in a database.

In more detail in this regard, the database may include various information about the order of the phase difference magnitudes 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 thus generated may be stored in advance in the final orientation angle determining unit 160.

The final azimuth angle determination unit 160 may determine the final azimuth angle using the phase difference magnitude order calculated by the phase difference magnitude order calculator 150 and the database described through FIGS. 4 to 6.

More specifically, the case in which 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 phase difference magnitude order calculated by the phase difference magnitude order calculation unit 150 is 5-4-1-3-2, and the final orientation angle determination unit 160 It can be assumed that the azimuth calculated by) is 10 ° and 190 °.

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

The signal direction detection apparatus 100 according to an embodiment of the present invention can improve the ease and efficiency for selecting a reference line by selecting the reference line using the absolute value of the phase difference. 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 direction detection of a signal, and the size of an area where the signal direction detection device 100 is installed can be minimized.

In addition, the signal direction detection apparatus 100 according to an embodiment of the present invention removes azimuth ambiguity by using a database including information about a phase difference magnitude order, so that additional hardware elements, such as an antenna, are not added. This is economical, and it is possible to minimize the size of the area where the signal direction detection device 100 is installed.

Combinations of each block in the block diagrams and each step of the flowcharts attached to this specification may be performed by computer program instructions. These computer program instructions may be mounted on a processor of a general purpose computer, special purpose computer, or other programmable data processing equipment, so that instructions executed through a processor of a computer or other programmable data processing equipment may be used in each block or flowchart of the block diagram. In each step, means are created to perform the functions described. These computer program instructions can also be stored in computer readable or computer readable memory that can be oriented to a computer or other programmable data processing equipment to implement a function in a particular way, so that computer readable or computer readable memory The instructions stored in it are also possible to produce an article of manufacture containing instructions means for performing the functions described in each step of each block or flowchart of the block diagram. Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so a series of operational steps are performed on a computer or other programmable data processing equipment to create a process that is executed by the computer to generate a computer or other programmable data. It is also possible for instructions to perform processing equipment to provide steps for performing the functions described in each block of the block diagram and in each step of the flowchart.

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

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential quality of the present invention. Therefore, the embodiments disclosed in the present specification are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention 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 interpreted as being included in the scope of the present invention.

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

Claims (10)

Receiving a signal,
Calculating a phase difference for each signal of each of a plurality of reference lines connecting two antennas adjacent to each other in a circular array antenna including at least three antennas;
Selecting a reference line from which the absolute value of the calculated phase difference is minimum among the plurality of reference lines;
Calculating a counterpart angle of the signal with respect to the selected reference line;
Calculating a phase difference magnitude order for the plurality of reference lines of the signal when the calculated counter-angularity is plural;
Calculating the azimuth angle of the signal for each of the calculated plurality of counterpart angles, and determining whether the calculated phase difference magnitude order corresponds to a pre-stored phase difference magnitude order of the signal among the calculated plurality of azimuth angles. Determining the final orientation angle indicating the direction
Signal direction detection method. According to 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 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 of the signal, and the identification number of each of the plurality of antennas,
The counterparty angle is calculated based on the phase difference, the wavelength of the signal, and the length of the reference line.
Signal direction detection method. According to claim 1,
In the determining of the final azimuth angle, a database including information on the number of the plurality of reference lines, the azimuth range associated with each of the plurality of reference lines generated based on the length of the reference line, and the order of the phase difference size for each azimuth range On the basis of, determining whether the calculated phase difference magnitude order corresponds to the pre-stored phase difference magnitude order
Signal direction detection method. According to claim 3,
Determining the final orientation angle,
Determining 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 range in the database;
And determining an azimuth 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. According to 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 each signal of a plurality of reference lines connecting two antennas adjacent to each other in a circular array antenna including at least three antennas;
A reference line selection unit for selecting a reference line from which the absolute value of the calculated phase difference is minimum among the plurality of reference lines;
A counterpart angle calculation unit calculating a counterpart angle of the signal with respect to the selected reference line;
A phase difference magnitude order calculator configured to calculate a phase difference magnitude order for the plurality of reference lines of the signal when the calculated counterparty angles are plural;
Calculating the azimuth angle of the signal for each of the calculated plurality of counterpart angles, and determining whether the calculated phase difference magnitude order corresponds to a pre-stored phase difference magnitude order. A final azimuth angle determining unit indicating the direction
Signal direction detection device. The method of claim 6,
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 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 of the signal, and the identification number of each of the plurality of antennas,
The counterparty angle is calculated based on the phase difference, the wavelength of the signal, and the length of the reference line.
Signal direction detection 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, the azimuth range associated with each of the plurality of reference lines generated based on the length of the reference line, and the order of the phase difference size for each azimuth range,
Based on the database, it is determined whether the calculated phase difference magnitude order corresponds to a pre-stored phase difference magnitude order.
Signal direction detection device. The method of claim 8,
The final orientation angle determining unit,
Determine 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 range in the database,
The azimuth included in the determined azimuth range among the calculated azimuth angles is determined as a final azimuth angle indicating the direction of the signal
Signal direction detection device. The method of claim 6,
The reference line is a virtual line connecting the two antennas
Signal direction detection device.

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