JP6586893B2 - Method for deriving adjustment angle of reflector for micro wireless circuit - Google Patents

Description

  The present invention is applied to a micro radio line, and is located at a radio station at a first point and a second point so that radio communication can be performed between a radio unit at a first point and a radio unit at a second point. The present invention relates to an adjustment angle derivation method for deriving an adjustment angle of a reflector that reflects radio waves from a radio and changes the course of the radio waves.

  Conventionally, a micro wireless line may be configured using a reflector. For example, as shown in FIG. 9, when wireless communication is performed between the wireless device 200 at the point A and the wireless device 200 at the point B, an obstacle (for example, a mountain) is formed between the points A and B. It is assumed that there is no direct wireless communication between the wireless device 200 at the point A and the wireless device 200 at the point B. In such a case, it has been conventionally performed to construct a micro wireless line that reflects the radio wave of the wireless device 200 at points A and B with the reflector 100 to avoid an obstacle.

  Conventionally, there is a technique described in Patent Document 1 as this kind of technique. Patent Document 1 describes a reflector apparatus having a reflector that reflects a directional beam transmitted from an array antenna of a radio base station.

JP 2011-160234 A

  By the way, the direction (angle) of the reflecting plate may be shifted due to a disaster such as an earthquake or a typhoon. In this case, a communication failure may occur in the micro wireless line.

  Conventionally, when the direction of the reflector is deviated, the micro radio is set so that the strength of the received electric field at two distant locations where the micro radio is installed is maximized while moving the reflector slightly up and down and left and right. The direction of the reflector is adjusted while communicating at the three locations of the machine installation location and the reflector.

  However, the reflector is often installed at a high place, and its size is made of iron of 3m x 4m to 10m square. The burden is heavy. For this reason, it is desirable that the target value for adjusting the angle can be grasped in advance so that the work can be smoothly advanced without repeating the work of moving the reflector little by little.

  The present invention solves such a problem, and provides information regarding an adjustment angle required for restoration to a worker when a deviation occurs in the angle of a reflector used in a micro radio line. It is an object of the present invention to provide a method for deriving an adjustment angle of a reflector for a micro radio line that can be made possible.

  In order to achieve the above object, the present invention has the following configuration.

  (1) Used in a micro radio line, the radio at the first point and the radio at the second point so that radio communication can be performed between the radio at the first point and the radio at the second point. An adjustment angle derivation method for deriving an adjustment angle of a reflector that reflects radio waves from a machine and changes the path of the radio wave, and a fixed part attached to a frame of the reflector and a rotation that is rotatable with respect to the fixed part A micro radio link is normal using an electric field measuring device comprising a turntable comprising a portion, a slot antenna rotatably attached to the rotating portion, and an electric field strength meter for measuring the strength of a received electric field of the slot antenna. After the slot antenna is installed on the reflector plate through the turntable, the slot antenna is rotated to receive radio waves from the first point and second point radios, respectively. The step of acquiring each antenna angle at which the strength of the received electric field is maximized, and at the time of adjusting the orientation of the reflecting plate, after installing the slot antenna via the turntable in the frame of the reflecting plate, Rotating the slot antenna to receive radio waves from the radios at the first point and the second point, respectively, obtaining in advance the respective antenna angles at which the intensity of the received electric field is maximized, and receiving received at normal times A step of obtaining an adjustment angle of the reflection plate based on an antenna angle at which the intensity of the electric field is maximized and an antenna angle at which the intensity of the received electric field obtained at the time of adjustment is maximized. Adjustment angle derivation method.

  (2) In (1), the slot antenna is formed of a rectangular waveguide.

  (3) In (1) or (2), the turntable is installed on either one of an upper part or a lower part of the frame of the reflector and one side of the frame of the reflector, A method of deriving an adjustment angle of a reflector for a micro radio channel, characterized in that the adjustment angle in the vertical direction and the horizontal direction is obtained based on the intensity of the received electric field of the installed slot antenna.

  According to (1) to (3), the angle adjustment operation of the reflector is performed by measuring the direction (angle) in which the received electric field of the radio wave output from the radio device at the first point and the second point is maximized. Before doing so, the adjustment angle of the reflector can be derived. This makes it possible to smoothly perform the angle adjustment operation of the reflector.

  ADVANTAGE OF THE INVENTION According to this invention, when the shift | offset | difference arises in the angle of the reflecting plate used by a micro radio | wireless circuit, it becomes possible to provide the information regarding the angle adjustment required for recovery with respect to an operator, It is possible to smoothly perform the angle adjustment work.

It is explanatory drawing which shows the structure of the electric field measuring apparatus 1 used in one Embodiment of this invention. It is explanatory drawing which shows the state which attached the electric field measuring apparatus 1 to the reflecting plate 100. FIG. 3 is an explanatory diagram showing a configuration of a turntable 20. FIG. It is explanatory drawing which shows a part of adjustment angle derivation | leading-out method of the reflecting plate 100 using the electric field measuring device. It is explanatory drawing which shows a part of adjustment angle derivation | leading-out method of the reflecting plate 100 using the electric field measuring device. FIG. 4 is a diagram showing another configuration of the slot antenna 10 in the electric field measurement device 1. FIG. 4 is a diagram showing directivity characteristics of the slot antenna 10. It is a figure which shows the case where the electric field measuring apparatus 1 is utilized for confirmation of the presence or absence of the new loss in the area from the radio | wireless machine output of each of A point and B point to the reflector 100. It is a figure which shows an example of the micro radio | wireless line using a reflecting plate.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing a configuration of an electric field measuring apparatus 1 used in an embodiment of the present invention, FIG. 1 (a) is a perspective view, and FIG. 1 (b) is a front view of a slot antenna 10. FIG. 2 is an explanatory view showing a state in which the electric field measuring device 1 is attached to the reflecting plate 100.

[Configuration of Electric Field Measuring Device 1]
The electric field measuring apparatus 1 includes a slot antenna 10 used for microwave reception, a turntable 20, a field strength meter 30, and a cord 50.
The slot antenna 10 is provided with a plurality of slots 14 at intervals of ½ wavelength on one plane in a rectangular waveguide 12 having a square cross section. The longitudinal direction of the slot 14 is slightly inclined from the imaginary line direction perpendicular to the longitudinal direction of the rectangular waveguide 12, and the adjacent slots 14 are inclined in opposite directions.

  Further, the slot antenna 10 includes a protrusion 16 (see FIG. 1B) for fixing to the turntable 20. The protrusion 16 has a rectangular parallelepiped shape and is erected downward from the central portion of the lower surface of the slot antenna 10.

  The slot antenna 10 shown in FIG. 1 may be constituted by a single rectangular waveguide 12, but the present invention is not limited to this, and flange portions 12a and 12a are formed at both ends as shown in FIG. You may comprise elongate by arrange | positioning the short rectangular waveguide 12 to linear form, and connecting the flange parts 12a and 12a.

  As shown in FIG. 2, the turntable 20 is provided between the slot antenna 10 and the frame body 104 of the reflecting plate 100, and the slot antenna 10 is rotatably attached to the reflecting plate 100.

The electric field strength meter 30 measures the strength of the received electric field of the slot antenna 10. The cord 50 is for electrically connecting the slot antenna 10 and the electric field strength meter 30.
Here, the reflecting plate 100 has a plurality of reflectors 102 arranged and fixed inside a rectangular frame 104. The reflector 100 is fixed to a support structure 106 having a steel structure.
As shown in FIG. 2, the slot antenna 10 is fixed to the center portion of the upper side of the frame body 104 extending in the horizontal direction and the center portion of one side side extending in the vertical direction via the turntable 20. . At this time, the longitudinal direction of the slot antenna 10 is parallel to the horizontal upper side and the vertical side of the frame body 104, respectively.

3A and 3B are explanatory views showing the configuration of the turntable 20. FIG. 3A is a front view, FIG. 3B is a top view, FIG. 3C is a bottom view, and FIG. 3D is a side view. FIG.
The turntable 20 includes a fixed portion 22 that is fixed to the reflecting plate 100 (see FIG. 2), and a rotating portion 24 that is rotatably connected to the fixed portion 22.

  The fixed portion 22 and the rotating portion 24 are both substantially cylindrical members having the same diameter, and a rotating shaft 23 is provided at the center of the fixed portion 22 and the rotating portion 24. Is rotatable around the rotation shaft 23.

  A groove portion 22 a is formed on the lower surface of the fixed portion 22. The groove 22 a extends in the diameter direction along an imaginary straight line passing through the center of the lower surface of the fixed portion 22, and both end portions of the groove 22 a penetrate part of the side surface of the fixed portion 22. The widths of both wall surfaces in the groove 22 a are set to be about the thickness of the frame body 104. For this reason, the frame body 104 of the reflecting plate 100 can be fitted into the groove 22a.

  A groove portion 24 a is formed on the upper surface of the rotating portion 24. The groove portion 24 a extends in the diameter direction along an imaginary straight line passing through the center of the upper surface of the rotating portion 24, and both end portions of the groove portion 24 a penetrate part of the side surface of the rotating portion 24. The widths of both wall surfaces in the groove 24 a are set to the thickness of the protrusion 16. For this reason, the protrusion 16 can be fitted into the groove 24a.

  A scale 26 that indicates the rotation angle of the rotating portion 24 with respect to the fixing portion 22 is formed in the vicinity of the contact portion between the fixing portion 22 and the rotating portion 24 on the circumferential side surfaces of the fixing portion 22 and the rotating portion 24. . The scale 26 is set to show 0 degrees when the groove 22a and the groove 24a are parallel, in other words, when the side surface of the slot antenna 10 in which the slot 14 is formed and the mirror surface of the reflector 102 are parallel. ing.

[Method for Deriving Adjustment Angle of Reflecting Plate 100]
Next, a method for deriving the adjustment angle of the reflector 100 using the electric field measuring apparatus 1 will be described.
First, as shown in FIG. 2, the worker turns the turntable at the center of one of the upper and lower sides of the frame body 104 and the center of one side of the frame body 104, respectively. The turntable 20 is installed on the frame body 104 by fitting the 20 groove portions 22 a. In the present embodiment, the turntable 20 is installed at the center of the upper side of the frame body 104. Further, the slot antenna 10 is installed on the turntable 20 by fitting the protrusion 16 of the slot antenna 10 into the groove 24 a of the turntable 20. For convenience of the following description, the slot antenna 10 installed on the upper side of the frame body 104 may be referred to as a horizontal slot antenna 10. In addition, the slot antenna 10 installed on the side of the frame body 104 may be referred to as a vertical slot antenna 10.

Next, the worker connects the cord 50 to the horizontal slot antenna 10, and further connects the electric field strength meter 30 to the cord 50.
Next, as shown in FIG. 4A, the worker monitors the measured value of the electric field intensity meter 30 while rotating the horizontal slot antenna 10 so that the horizontal slot antenna 10 faces point A. Then, the horizontal antenna angle θ1 when the measured value of the electric field strength meter 30 becomes maximum is recorded.

  Next, as shown in FIG. 4B, the worker monitors the measured value of the electric field intensity meter 30 while rotating the horizontal slot antenna 10 so that the horizontal slot antenna 10 faces point B. Then, the horizontal antenna angle θ2 when the measured value of the electric field strength meter 30 becomes maximum is recorded.

Next, after recording the horizontal antenna angles θ <b> 1 and θ <b> 2, the worker removes the cord 50 from the horizontal slot antenna 10 and connects it to the vertical slot antenna 10.
Next, the worker monitors the measured value of the electric field intensity meter 30 from the point A while rotating the vertical slot antenna 10. Then, the vertical antenna angle φ1 when the measured value of the electric field strength meter 30 becomes maximum is recorded.

  Next, the worker monitors the measured value of the electric field intensity meter 30 from the point B while rotating the vertical slot antenna 10. Then, the vertical antenna angle φ2 when the measured value of the electric field strength meter 30 becomes maximum is recorded.

  The antenna angles θ1, θ2, φ1, and φ2 obtained by the above-described operation are values used as a reference for deriving the deviation angle of the reflecting plate 100. For this reason, the above-described work for obtaining the antenna angles θ1, θ2, φ1, and φ2 is performed after confirming that the micro radio link is normal.

  After the work for obtaining the antenna angles θ1, θ2, φ1, and φ2 is completed, the worker removes the slot antenna 10 and the turntable 20 from the reflector 100 and stores them until the next time the antenna angle is obtained. deep.

Next, for example, when there is a possibility that the reflection plate 100 is displaced due to the influence of an earthquake, a typhoon or the like, the worker brings the electric field measurement device 1 and moves to the reflection plate 100.
Then, in the same manner as when obtaining the horizontal antenna angles θ1, θ2 and the vertical antenna angles φ1, φ2, as shown in FIGS. 5 (a) and 5 (b), the measured value of the electric field strength meter 30 is maximum. Next, the horizontal antenna angles θ1 ′ and θ2 ′ are obtained, and the vertical antenna angles φ1 ′ and φ2 ′ when the measured value of the electric field strength meter 30 is maximum are obtained.

Then, the difference between the antenna angles θ1, θ2, φ1, and φ2, which are reference standards acquired in advance, and the newly measured antenna angles θ1 ′, θ2 ′, φ1 ′, and φ2 ′ is the deviation angle of the reflector 100. Specifically, when the horizontal deviation angle is Δθ and the vertical deviation angle is Δφ,
Horizontal direction: Δθ = θ1−θ1 ′ = θ2′−θ2
Vertical direction: Δφ = φ1-φ1 ′ = φ2′−φ2
It becomes. For this reason, if the angle of the reflecting plate 100 is changed by Δθ and Δφ, the reflecting plate 100 can be almost returned to the normal state.
As described above, the operator at the installation location of the reflector 100 obtains the horizontal deviation angle Δθ and the vertical deviation angle Δφ, and adjusts the reflector 100, thereby completing the adjustment work of the reflector 100. .

  According to the present embodiment configured as described above, the horizontal and vertical deviation angles of the reflector 100 are grasped by using the electric field measuring device 1 before the work of adjusting the angle of the reflector 100 is performed. can do. For this reason, the operation of adjusting the angle of the reflecting plate 100 can be easily and smoothly advanced. In addition, since it is possible to restore the normal micro wireless line by the adjustment work on the reflector 100 side, it is necessary to place workers at points A and B where the wireless devices are installed as in the past. Disappears.

  Further, according to the present embodiment, the turntable 20 is formed with a groove for attaching the groove 22 a that fits into the frame body 104 of the reflector 100 and the groove 24 a that fits into the protrusion 10 a of the slot antenna 10. Therefore, the slot antenna 10 can be accurately attached to the reflector 100. Further, since the scale 26 for reading the angle between the reflector 100 and the slot antenna 10 is engraved, the measurement error can be suppressed small.

  Further, according to the present embodiment, the slot antenna 10 is an antenna mainly composed of the rectangular waveguide 12, and a configuration in which a plurality of rectangular waveguides 12 are connected as shown in FIG. It is. In particular, since the slot antenna 10 can be disassembled into a length that allows the slot antenna 10 to be carried by connecting a plurality of rectangular waveguides 12, the slot antenna 10 can be used even when the reflector 100 is in the mountains. Carrying in is easy, and the performance as an antenna is not affected. Further, since the antenna is mainly composed of the rectangular waveguide 12, as shown in FIG. 7, the directivity characteristic of the slot antenna 10 is very sharp. The half-value angle is about 1 °, and the vertical plane half-value angle is about 15 to 20 °. If the horizontal plane half-value angle is too sharp, the length of the slot antenna 10 can be shortened to widen the half-value angle, and even when the reflector 100 is largely deviated.

  As mentioned above, although embodiment of this invention was described, embodiment of this invention is not restricted to embodiment mentioned above. For example, according to the above-described embodiment, it is assumed that the existing reflector 100 is displaced. However, the present invention is not limited to this, and the angle of the reflector 100 when the reflector 100 is temporarily installed when a micro wireless line is newly installed. It is also possible to apply to the adjustment work.

For example, in FIG. 5, if the direction (angle) at which the received electric field from point A and point B is maximized is measured, the installation condition of the reflector 100 is approximately incident angle = reflection angle.
Horizontal direction: (θ1′−θ2 ′) / 2
Vertical direction: (φ1′−φ2 ′) / 2
Therefore, by adjusting the direction (angle) of the reflecting plate 100, it can be adjusted to a generally good state. Since the subsequent work is only fine adjustment, the adjustment work can be easily performed.

  In addition, during periodic inspection and patrol of the reflector 100, the electric field measuring device 1 may be used to measure the maximum received electric field from the points A and B, and to compare the difference from the normal received electric field. Good. Thereby, it becomes possible to apply to confirming the presence or absence of a new loss in the section from the radio output at each of the points A and B to the reflector 100. For example, when the received electric field from the slot antenna 10 does not show an angle shift in the reflector 100, while the intensity of the received electric field is lower than the reference intensity, the transmission side (point A, B It is possible to determine that there is a possibility that a failure has occurred in the equipment on the wireless device side). Specifically, it is possible to determine that there is a possibility that a failure has occurred before reaching the antenna 204 via the waveguide 202 from the radio device 200 shown in FIG.

DESCRIPTION OF SYMBOLS 1 Electric field measuring device 10 Slot antenna 10a Protrusion 12 Rectangular waveguide 12a Flange part 14 Slot 16 Protrusion 20 Rotating base 22 Fixing part 22a Groove part 23 Rotating shaft 24 Rotating part 24a Groove part 26 Scale 30 Electric field strength meter 50 Code 100 Reflecting plate 102 Reflection Body 104 Frame 106 Supporting building 200 Radio 202 Waveguide 204 Antenna

Claims (3)

Used for micro radio lines, from the radio at the first point and the radio at the second point so that radio communication between the radio at the first point and the radio at the second point is possible. An adjustment angle derivation method for deriving an adjustment angle of a reflector that reflects radio waves and changes the path of radio waves,
A rotating base comprising a fixed portion attached to the frame of the reflector and a rotating portion rotatable relative to the fixed portion; a slot antenna rotatably attached to the rotating portion; and a strength of a received electric field of the slot antenna. Using an electric field measuring device equipped with an electric field strength meter to measure,
After the slot antenna is installed through the turntable on the reflector plate in a normal state of the micro radio line, the slot antenna is rotated to emit radio waves from the radios at the first point and the second point, respectively. Receiving and pre-acquiring each antenna angle at which the strength of the received electric field is maximum;
At the time of adjusting the orientation of the reflecting plate, after the slot antenna is installed on the frame of the reflecting plate via the turntable, the slot antenna is rotated to remove the radio from the first and second points. Receiving each radio wave and obtaining in advance each antenna angle at which the strength of the received electric field is maximum;
A step of obtaining an adjustment angle of the reflector based on an antenna angle at which the intensity of the received electric field acquired at the time of normal operation is maximized and an antenna angle at which the intensity of the received electric field acquired at the time of adjustment is maximized. Method for deriving the adjustment angle of the line reflector.   2. The method of deriving an adjustment angle of a reflector for a micro radio channel according to claim 1, wherein the slot antenna is a rectangular waveguide. The turntable is installed on either one of an upper part or a lower part of the frame of the reflecting plate, and one side of the frame of the reflecting plate,
3. The adjustment angle of the reflector for a micro radio channel according to claim 1, wherein the adjustment angle in the vertical direction and the horizontal direction is obtained based on the intensity of the reception electric field of the slot antenna installed on each turntable. Derivation method.

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