Radio wave status output device, radio wave status output method, and radio wave status output program

Abstract

This radio wave status output device comprises: a measurement unit for measuring, when a directional antenna is directed to a plurality of different points on a plane intersecting a reference straight line extending along the horizontal direction, the reception power or the C / N value of radio waves received by the directional antenna; an angle measurement unit for measuring the azimuth angle and the elevation angle of the directional antenna when the directional antenna is directed to the plurality of different points; a calculation unit for calculating, for each of the plurality of different points, an approximation curved surface corresponding to the reception power or the C / N value at the position of said point on an XY-plane, in which the azimuth angle and the elevation angle measured by the angle measurement unit are respectively defined as an X-axis value and a Y-axis value, and the reception power or the C / N value measured by the measurement unit is defined as a Z-axis value; an extraction unit for extracting, from the approximation curved surface calculated by the calculation unit, a range on the XY-plane in which the value of the Z-axis is equal to or more than a prescribed threshold; and an output unit for outputting the range on the XY-plane extracted by the extraction unit.

Description

[Technical field]

[0001] The present invention relates to a radio wave status output device, a radio wave status output method, and a radio wave status output program. [Background technology]

[0002] Many methods have been proposed for estimating the direction of arrival of radio waves in wireless communication. For example, a method using the phase difference of radio waves based on the difference in antenna positions, and the MUSIC (Multiple Signal Classification) method are effective, and there is also a method that makes it possible to estimate the direction of arrival of radio waves in a horizontal plane by changing the direction of the main lobe or null point of the antenna pattern (for example, see Non-Patent Document 1).

[0003] Conventional techniques do not assume that radio waves arrive from each of three-dimensional directions, and estimate the direction of arrival of radio waves based on a correlation matrix obtained using an array antenna. In other words, conventional techniques estimate the direction of arrival in a plane. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] Minseok Kim, "Fundamentals and implementation examples of direction-of-arrival estimation systems," Design Wave Magazine, December 2007, pp. 112-118. Summary of the Invention [Problem to be solved by the invention]

[0005] However, radio waves do not only arrive from the horizontal direction. For example, due to diffraction and reflection, radio waves can arrive from above and below. Therefore, in order to more accurately grasp the radio wave conditions, such as the direction of arrival of radio waves, it is necessary to take into account radio waves arriving from above and below.

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a radio wave situation output device, a radio wave situation output method, and a radio wave situation output program that can easily grasp three-dimensional radio wave conditions. [Means for solving the problem]

[0007] A radio wave condition output device according to one embodiment of the present invention includes a measurement unit that measures a received power or a C / N value of a radio wave received by a directional antenna when the directional antenna is pointed at each of a plurality of different points located on a plane perpendicular to a reference line extending in a horizontal direction; an angle measurement unit that measures an azimuth angle and an elevation angle of the directional antenna when the directional antenna is pointed at each of the plurality of different points; a calculation unit that calculates an approximated surface corresponding to each of the received power or the C / N value at a position on an XY plane of each of the plurality of different points, with the azimuth angle and the elevation angle measured by the angle measurement unit being the X-axis value and the Y-axis value, respectively, and the received power or the C / N value measured by the measurement unit being the Z-axis value; an extraction unit that extracts a range on the XY plane where the Z-axis value is equal to or greater than a predetermined threshold value from the approximated surface calculated by the calculation unit; and an output unit that outputs the range on the XY plane extracted by the extraction unit.

[0008] Furthermore, a radio wave status output method according to one embodiment of the present invention includes a measurement step of measuring a received power or a C / N value of a radio wave received by a directional antenna when the directional antenna is pointed at each of a plurality of different points located on a plane perpendicular to a reference line extending in a horizontal direction; an angle measurement step of measuring an azimuth angle and an elevation angle of the directional antenna when the directional antenna is pointed at each of the plurality of different points; a calculation step of calculating an approximation surface corresponding to each of the received power or the C / N value at a position on an XY plane of each of the plurality of different points, with the measured azimuth angle and elevation angle being the X-axis value and the Y-axis value, respectively, and the measured received power or C / N value being the Z-axis value; an extraction step of extracting from the calculated approximation surface a range on the XY plane where the Z-axis value is equal to or greater than a predetermined threshold; and an output step of outputting the extracted range on the XY plane. Effect of the Invention

[0009] According to the present invention, it is possible to easily grasp three-dimensional radio wave conditions. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating an example of a configuration of a radio wave condition output device according to an embodiment. [Diagram 2] 1A is a diagram illustrating a plurality of different points located on a plane perpendicular to a reference line extending in the horizontal direction, and FIG. 1B is a diagram illustrating a result of an extraction unit (described later) extracting a range on an XY plane using the plurality of different points. [Diagram 3] 1 is a flowchart illustrating an example of the operation of a radio wave condition output device according to an embodiment. [Figure 4] FIG. 13 is a diagram illustrating a configuration example of a modified example of a radio wave condition output device according to an embodiment. [Diagram 5] 1A is a diagram illustrating a plurality of different points located on a plane perpendicular to a reference line extending in the horizontal direction, and FIG. 1B is a diagram illustrating a result of an extraction unit (described later) extracting a range on an XY plane using the plurality of different points. [Figure 6] 11 is a flowchart illustrating an example of an operation of a modified example of a radio wave condition output device according to an embodiment. [Figure 7] 1 is a diagram illustrating an example of a hardware configuration of a radio wave condition output device 1 according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] An example of the configuration of a radio wave condition output device 1 according to an embodiment will be described below with reference to the drawings. Fig. 1 is a diagram showing an example of the configuration of a radio wave condition output device 1 according to an embodiment.

[0012] As shown in FIG. 1, a radio wave condition output device 1 according to an embodiment includes a directional antenna 2, a measurement unit 10, an angle measurement unit 11, a storage unit 12, a calculation unit 13, an extraction unit 14, and an output unit 15, for example.

[0013] The directional antenna 2 is fixed to a fixed portion 20 , receives radio waves, and outputs the received power to the measurement portion 10 .

[0014] When the directional antenna 2 is pointed at each of multiple different points located on a plane perpendicular to a reference line extending horizontally, the measurement unit 10 measures the received power or C / N value of the radio waves received by the directional antenna 2, and outputs the results to the memory unit 12.

[0015] Fig. 2 is a diagram illustrating a plane perpendicular to a reference line extending in the horizontal direction used by the measurement unit 10. Fig. 2(a) is a diagram illustrating a plurality of different points (A to I) located on the plane perpendicular to the reference line extending in the horizontal direction. Fig. 2(b) is a diagram illustrating a result of extraction of a range on the XY plane by the extraction unit 14 described later using the plurality of different points (A to I).

[0016] In FIG. 2, a straight line extending horizontally from directional antenna 2 to point E is set as a reference point.

[0017] When the directional antenna 2 is directed toward each of a plurality of different points (A to I), the angle measurement unit 11 measures the azimuth angle and elevation angle of the directional antenna 2, and outputs the measured values ​​to the storage unit 12.

[0018] The storage unit 12 is a memory or the like that stores various pieces of information used by the radio wave condition output device 1, and stores information output by the measurement unit 10 and the angle measurement unit 11, and predetermined information.

[0019] The calculation unit 13 calculates an approximated surface corresponding to each of the multiple different points at a position on the XY plane for each of the multiple different points, with the azimuth angle and elevation angle measured by the angle measurement unit 11 as the X-axis value and the Y-axis value, respectively, and the received power or C / N value measured by the measurement unit 10 as the Z-axis value, and outputs the calculated approximated surface to the extraction unit 14.

[0020] The extraction unit 14 extracts a range on the XY plane where the Z-axis value is equal to or greater than a predetermined threshold value from the approximated surface calculated by the calculation unit 13, and outputs the extracted range to the output unit 15. The extraction unit 14 may also extract ranges on the XY plane where the Z-axis value is equal to or greater than each of a plurality of threshold values.

[0021] For example, the extraction unit 14 extracts the range on the XY plane shown in FIG. 2(b) (the range surrounded by diagonal lines), and outputs it to the output unit 15.

[0022] The threshold value used by the extraction unit 14 may be determined based on the reception power or C / N value of the radio waves received by the omni-antenna 3 (see FIG. 4) disposed near the directional antenna 2.

[0023] The output unit 15 outputs, for example, by displaying the range on the XY plane extracted by the extraction unit 14. For example, the output unit 15 may output the range on the XY plane in which the Z-axis value is equal to or greater than a predetermined threshold value so as to display it in a color different from other ranges.

[0024] Fig. 3 is a flow chart showing an example of the operation of the radio wave condition output device 1. As shown in Fig. 3, in step 100 (S100), the radio wave condition output device 1 determines the X-axis and Y-axis shown in Fig. 2(a).

[0025] In step 102 (S102), the radio wave status output device 1 measures the reception power or C / N value by the directional antenna 2, the azimuth angle, and the elevation angle.

[0026] In step 104 (S104), the radio wave condition output device 1 determines whether the number of samples of points on the XY plane is sufficient or not, and if it is sufficient (S104: Yes), proceeds to processing of S106, and if it is not sufficient (S104: No), returns to processing of S100.

[0027] In step 106 (S106), the calculation unit 13 calculates an approximation surface corresponding to each of the multiple different points at the positions on the XY plane, with the azimuth angle and elevation angle measured by the angle measurement unit 11 as the X-axis value and the Y-axis value, respectively, and the received power or C / N value measured by the measurement unit 10 as the Z-axis value.

[0028] In step 108 (S108), the extraction unit 14 extracts, from the approximated surface calculated by the calculation unit 13, a range on the XY plane in which the Z-axis value is equal to or greater than a predetermined threshold value.

[0029] In step 110 (S110), the output unit 15 outputs the range on the XY plane extracted by the extraction unit .

[0030] Then, by referring to the range on the XY plane output by the radio wave condition output device 1, the worker can easily grasp the three-dimensional radio wave condition.

[0031] Next, a description will be given of a modified example of the radio wave condition output device 1. Fig. 4 is a diagram showing an example of the configuration of a modified example of the radio wave condition output device 1 (a radio wave condition output device 1a).

[0032] 4, the radio wave condition output device 1 according to one embodiment includes, for example, a directional antenna 2, an omni-antenna 3, a measurement unit 10, an angle measurement unit 11, a storage unit 12, a calculation unit 13, an extraction unit 14, and an output unit 15. Note that the same reference numerals are used to designate components that are substantially the same as those described above with reference to FIG.

[0033] The omni-antenna 3 is disposed in the vicinity of the directional antenna 2. The omni-antenna 3 is configured such that the reception power or the C / N value of the radio waves received is stored in advance in a storage unit 12.

[0034] Fig. 5 is a diagram illustrating a plane perpendicular to a reference line extending in the horizontal direction used by the measurement unit 10. Fig. 5(a) is a diagram illustrating a plurality of different points (A to I) located on the plane perpendicular to the reference line extending in the horizontal direction. Fig. 5(b) is a diagram illustrating a result of extraction of a range on the XY plane by the extraction unit 14 described later using the plurality of different points (A to I).

[0035] In FIG. 5, a straight line extending horizontally from directional antenna 2 to point E is set as a reference point.

[0036] 6 is a flowchart showing an example of the operation of the radio wave condition output device 1a. As shown in FIG. 6, in step 200 (S200), the radio wave condition output device 1a measures the reception power or the C / N value at the omni-antenna 3.

[0037] Then, the radio wave condition output device 1a determines the threshold value used by the extraction unit 14 based on the reception power or C / N value of the radio waves received by the omni-antenna 3, and then performs the same processing as the radio wave condition output device 1 does.

[0038] In addition, each function of the radio wave condition output device 1, 1a may be configured in part or in whole by hardware such as a PLD (Programmable Logic Device) or an FPGA (Field Programmable Gate Array), or may be configured as a program executed by a processor such as a CPU.

[0039] For example, the radio wave condition output device 1, 1a can be realized by using a computer and a program, and the program can be recorded on a storage medium or provided via a network.

[0040] Fig. 7 is a diagram showing an example of the hardware configuration of a radio wave condition output device 1 according to an embodiment. As shown in Fig. 7, the radio wave condition output device 1 has an input unit 50, an output unit 51, a communication unit 52, a CPU 53, a memory 54, and a HDD 55 connected via a bus 56, and has a function as a computer. In addition, the radio wave condition output device 1 is configured to input and output data to and from a computer-readable storage medium 57.

[0041] The input unit 50 is, for example, a keyboard and a mouse, etc. The output unit 51 is, for example, a display device, etc. The communication unit 52 is, for example, a network interface, etc.

[0042] The CPU 53 controls each unit constituting the radio wave condition output device 1 and performs predetermined processing, etc. The memory 54 and the HDD 55 correspond to the above-mentioned storage unit 12 that stores data and the like.

[0043] The storage medium 57 is capable of storing programs and the like for executing the functions of the radio wave condition output device 1. Note that the architecture constituting the radio wave condition output device 1 is not limited to the example shown in FIG.

[0044] As described above, in one embodiment of the radio wave condition output device 1, 1a, the output unit 15 outputs the range on the XY plane extracted by the extraction unit 14, making it possible to easily grasp the three-dimensional radio wave condition. [Explanation of symbols]

[0045] 1 radio wave condition output device, 2 directional antenna, 3 omni antenna, 10 measurement unit, 11 angle measurement unit, 12 storage unit, 13 calculation unit, 14 extraction unit, 15 output unit, 20 fixed unit, 50 input unit, 51 output unit, 52 communication unit, 53 CPU, 54 memory, 55 HDD, 56 bus, 57 storage medium

Claims

1. a measurement unit that measures a reception power or a C / N ratio of radio waves received by a directional antenna when the directional antenna is directed to each of a plurality of different points located on a plane perpendicular to a reference line extending in a horizontal direction; an angle measurement unit that measures an azimuth angle and an elevation angle of the directional antenna when the directional antenna is directed to each of the plurality of different points; a calculation unit that calculates an approximated curved surface corresponding to each of the received power or the C / N value at a position on an XY plane of each of the plurality of different points, with the azimuth angle and elevation angle measured by the angle measurement unit being the X-axis value and the Y-axis value, respectively, and the received power or the C / N value measured by the measurement unit being the Z-axis value, for each of the plurality of different points; an extraction unit that extracts a range on an XY plane where a Z-axis value is equal to or greater than a predetermined threshold value from the approximated curved surface calculated by the calculation unit; an output unit that outputs the range on the XY plane extracted by the extraction unit; A radio wave status output device comprising:

2. The threshold value is The frequency is determined based on the reception power or C / N value of the radio waves received by an omni-antenna disposed near the directional antenna.

2. The radio wave condition output device according to claim 1,

3. The extraction unit is Extracting ranges on the XY plane where the Z-axis value is equal to or greater than each of a plurality of thresholds 3. The radio wave condition output device according to claim 1 or 2,

4. The output unit is The range on the XY plane where the Z-axis value is equal to or greater than a predetermined threshold is displayed in a different color from the other ranges.

4. The radio wave condition output device according to claim 1, wherein

5. a measuring step of measuring a reception power or a C / N ratio of radio waves received by a directional antenna when the directional antenna is directed to each of a plurality of different points located on a plane perpendicular to a reference line extending in a horizontal direction; an angle measuring step of measuring an azimuth angle and an elevation angle of the directional antenna when the directional antenna is directed to each of the plurality of different points; a calculation step of calculating an approximated curved surface corresponding to each of the received power or C / N value at a position on an XY plane of each of the plurality of different points, with the measured azimuth angle and elevation angle being the X-axis value and the Y-axis value, respectively, and the measured received power or C / N value being the Z-axis value, for each of the plurality of different points; an extraction step of extracting, from the calculated approximated surface, a range on the XY plane in which the Z-axis value is equal to or greater than a predetermined threshold; an output step of outputting the range on the extracted XY plane; A radio wave status output method comprising:

6. The threshold value is The frequency is determined based on the reception power or C / N value of the radio waves received by an omni-antenna disposed near the directional antenna.

6. The method for outputting radio wave conditions according to claim 5, further comprising:

7. In the extraction step, Extracting ranges on the XY plane where the Z-axis value is equal to or greater than each of a plurality of thresholds 7. The method for outputting radio wave conditions according to claim 5 or 6, further comprising:

8. A radio wave condition output program for causing a computer to function as each of the components of the radio wave condition output device according to any one of claims 1 to 4.

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