JP2021148789A - Radio wave propagation path maintenance system - Google Patents

Abstract

To provide a radio wave propagation path maintenance system capable of assisting an amount of work for detecting an influence substance affecting propagation of radio waves.SOLUTION: A radio wave propagation path maintenance system 12 includes: an acquisition unit 121 for acquiring photographing information obtained by a photographing device 11 for photographing a ground area between a plurality of relay objects 2 for transmitting and receiving radio waves; a calculation unit 124 for showing a three-dimensional position of a propagation path on which radio waves propagate to calculate a three-dimensional propagation path model whose shape is constant on a plane orthogonal to a line connecting a plurality of relay objects; and a first detection unit 125 for detecting an influence substance influencing propagation of radio waves based on the photographic information and the three-dimensional propagation path model.SELECTED DRAWING: Figure 1

Description

The present invention relates to a radio wave propagation path maintenance system.

High-frequency radio waves have high straightness. When transmitting radio waves with such straightness over a long distance in mountainous areas while avoiding obstacles such as mountain peaks, the radio waves are transmitted from the transmitting antenna to the receiving antenna while being reflected by several radio wave reflectors. Is being done.

However, if there is a tree or the like in or near the radio wave path (hereinafter referred to as the propagation path) between the antenna and the reflector and between the reflector and the reflector, it may interfere with or cause transmission. There is. Therefore, measures are being taken to find trees that are likely to be obstacles for people to enter the mountains and cut them down.

In this measure, it takes a long time and a lot of labor to find a tree that is likely to be an obstacle for a person to enter the mountain. Moreover, since the radio wave propagation path is not an object but a spatial area invisible to the human eye, it is difficult for a person to determine which tree is likely to be a problem.

In Patent Document 1, in order to monitor the positional relationship between the power transmission line and the tree, a three-dimensional image of the tree around the power transmission line is created from the information measured by the stereo camera of the unmanned helicopter and the laser distance meter. It is described that by inputting the data of the steel tower and the transmission line prepared in advance, the distance between the tree and the transmission line is calculated and it is judged whether or not it is too close.

Japanese Unexamined Patent Publication No. 2005-265699

The radio wave propagation path maintenance system indicates a three-dimensional position of a propagation path in which radio waves propagate, and an acquisition unit that acquires shooting information obtained by a photographing device that photographs a ground region between a plurality of relay objects that transfer radio waves. , It affects the propagation of radio waves based on the calculation unit that calculates the three-dimensional propagation path model whose shape is constant on the plane orthogonal to the line connecting the plurality of relay objects, the photographing information, and the three-dimensional propagation path model. It is provided with a first detection unit that detects an influential object.

According to the present invention, it is possible to help the amount of work for detecting an influential substance that affects the propagation of radio waves.

The explanatory view of the radio wave propagation path maintenance system in 1st Example. Hardware configuration diagram of radio wave propagation path maintenance system. Flow chart of radio wave propagation path maintenance system. Explanatory drawing of radio wave propagation path. Explanatory drawing of the tree detection part. Explanatory drawing of designated information input part. Flow chart of the three-dimensional propagation path model calculation unit. Explanatory drawing of a three-dimensional propagation path model. Explanatory drawing of a modification of a three-dimensional propagation path model. Explanatory drawing of a modification of a three-dimensional propagation path model. Explanatory drawing of the influence detection part. The figure which looked at the 3D propagation path model from the A direction. The explanatory view of the designated information input part in 2nd Example. The figure for demonstrating the operation of the radio wave propagation path maintenance system in 3rd Example. The figure for demonstrating the operation of the radio wave propagation path maintenance system in 3rd Example. The figure which shows an example of the screen displayed on the display device of the radio wave propagation path maintenance system in 3rd Example. The flowchart for demonstrating an example of the operation of the radio wave propagation path maintenance system in 3rd Embodiment. The flowchart for demonstrating another example of operation of the radio wave propagation path maintenance system in 3rd Embodiment. The flowchart for demonstrating another example of the operation of the radio wave propagation path maintenance system in 3rd Embodiment. The flowchart for demonstrating still another example of the operation of the radio wave propagation path maintenance system in 3rd Embodiment. The figure which shows an example of the 3D propagation path model in 4th Example.

FIG. 1 is an explanatory diagram of a radio wave propagation path maintenance system 12. The radio wave propagation path maintenance system 12 detects an influence tree 5 as an example of an "influencer" that affects the propagation of radio waves. The radio wave propagation path maintenance system 12 is, for example, a propagation path of a radio wave path based on shooting information acquired from an unmanned aerial vehicle (hereinafter, may be referred to as a drone) 11 having a camera 114 as an example of a “shooting device”. A three-dimensional model of 4 is generated, and the affected tree 5 is detected.

While flying, the drone 11 photographs the area on the ground between the plurality of relays 2. Of course, the drone 11 may photograph a wider ground area including not only the area between the plurality of relays 2 but also the surrounding area and the relays 2. Each relay material 2 transmits and receives radio waves to each other with one or more other relay materials 2. The relay material 2 includes, for example, the transmission / reception antenna 211 of the tower 21 or a reflector that reflects radio waves. There can be 22 mag. A plurality of drones 11 may be used, but the case where one drone 11 is used will be described below as an example.

The drone 11 includes, for example, a flight device 111, a position measuring device 112, an orientation measuring device 113, and a camera 114. The flight device 111 is a device for flying the drone 11. The flight device 111 includes, for example, a propeller, a propeller drive device, an attitude control device, and the like.

The position measuring device 112 measures the three-dimensional position information of the drone 11 or the camera 114. The three-dimensional position information is, for example, three-dimensional geographic coordinates such as latitude, longitude or altitude. For the position measuring device 112, for example, GNSS (Global Navigation Satellite System) or RTK (Real Time Kinematic) may be used. The position measuring device 112 is not limited to the device in which GNSS or RTK is used.

The orientation measuring device 113 measures the line of sight (optical axis) of the camera 114 or the three-dimensional orientation of the drone 11. The three-dimensional orientation is set by, for example, a roll angle, a pitch angle, and a yaw angle. The azimuth measuring device 113 is, for example, a gyro sensor. The orientation measuring device 113 is not limited to the gyro sensor.

The camera 114 is a spatial region on the ground including a three-dimensional position of the propagation path 4 calculated as described later and its surroundings (for example, a spatial region on the ground between the relays 2 and is selected in advance. Take a picture. The image of the region captured by the camera 114 will be described by taking the still image data of the region between the relay objects 2 as an example, but the captured data is not limited to the still image and may be a moving image.

The radio wave propagation path maintenance system 12 detects the influence tree 5 that affects the propagation path 4 based on the shooting information of the drone 11. The radio wave propagation path maintenance system 12 includes, for example, a shooting information acquisition unit 121, a three-dimensional terrain model generation unit 122 as an example of the “generation unit”, and a tree detection unit 123 as an example of the “second detection unit”. It includes a three-dimensional propagation path model calculation unit 124 as an example of the "calculation unit", an influence detection unit 125 as an example of the "first detection unit", a designated information input unit 126, and a display unit 127. In the figure, "part" may be omitted.

In the designated information input unit 126, it is input from the user terminal 13 that the user terminal 13 wants to detect the influence tree 5 that affects which propagation path 4 (in other words, the ground region between which pair of relays 2). That is, the user relays information that specifies the propagation path 4 of the target for which the affected tree 5 is to be detected, or a pair that forms the propagation path 4 of the target (that is, both ends of the propagation path 4 of the target). Information for designating an object (hereinafter referred to as a relay object of a target pair) 2 is input from the user terminal 13 to the designated information input unit 126.

Hereinafter, the information for designating the target propagation path 4 input to the designated information input unit 126 or the information for designating the relay material 2 of the target pair may be collectively referred to as designated information. The designated information input unit 126 sends the designated information to the shooting information acquisition unit 121.

The shooting information acquisition unit 121 inputs and inputs the shooting information obtained by the camera 114 of the drone 11 shooting the area on the ground between the plurality of relay objects 2 by wireless communication or wired communication from the camera 114. Record shooting information. The shooting information acquisition unit 121 obtains shooting information of a region (hereinafter, referred to as a target region) corresponding to the target propagation path 4 or the relay material 2 of the target pair designated by the designated information input to the designated information input unit 126. , Selectively read out from the shooting information recorded in advance and pass it to the three-dimensional terrain model generation unit 122. Here, the same processing as described above may be performed for imaging information in a wider area including not only the target area but also the peripheral area of the target area. However, in the following, the description of the imaging information will focus on the target area.

The shooting information includes, for example, a photographic image of a region between a plurality of relay objects 2, position measurement data of the drone 11 (or camera 114) at the time of shooting each image (in the case of a moving image, each frame image), and orientation measurement. Contains data. The shooting information acquisition unit 121 sends the shooting information of the target region corresponding to the target propagation path 4 or the relay material 2 of the target pair to the three-dimensional terrain model generation unit 122.

The shooting information acquisition unit 121 is not limited to inputting the shooting information from the camera 114 by wireless communication or wired communication, but the shooting information is input by wireless communication or wired communication via at least one data relay device. May be good. The data relay device may be a control controller that controls the drone 11 and can be carried by the user. The user terminal 13 may function as a data relay device, and may input shooting information into the shooting information acquisition unit 121 by wireless communication or wired communication.

The three-dimensional terrain model generation unit 122 has the three-dimensional shape of various objects (for example, a large number of trees, exposed ground, target relay material 2, etc.) existing in the target area based on the acquired shooting information of the target area. And a three-dimensional model (hereinafter referred to as a three-dimensional terrain model) showing the three-dimensional position is generated.

An example of a method for generating a three-dimensional terrain model is as follows. A large number of feature points of various objects existing in the target area are extracted from a large number of photographic images obtained by photographing the target area from many different positions. Based on the position measurement data and the orientation measurement data of the drone 11 (or the camera 114) at the time of taking each of the large number of photographic images, the three-dimensional positions of the large number of feature points are calculated. A three-dimensional terrain model is generated by connecting the three-dimensional positions of these many feature points in a mesh shape. The method of generating the three-dimensional terrain model is not limited to the above-mentioned method. For example, a neural network trained on how to generate a three-dimensional terrain model from a photographic image may be used.

The tree detection unit 123 detects each tree in the three-dimensional terrain model. The tree detection unit 123 can detect each tree (particularly, the top of each tree having a high altitude) based on the shape characteristics of each part of the three-dimensional terrain model and the color characteristics obtained from the photographic image of each part. To detect. The tree detection method is not limited to the above method. For example, a neural network trained on how to detect each tree from a three-dimensional terrain model may be used.

Furthermore, when the height of one or more trees existing in the three-dimensional terrain model can be known, the value of the entire detection result is corrected by using the difference between the detection result of the tree detection unit 123 and the locally observed tree. You may.

The three-dimensional propagation path model calculation unit 124 describes the three-dimensional shape and three-dimensional position of each of the one or more propagation paths 4 formed between one or more pairs of relay objects 2 adjacent to each other in the plurality of relay objects 2. A three-dimensional propagation path model 43 (see FIG. 8) showing the above is generated. The three-dimensional propagation path model calculation unit 124 calculates, for example, the three-dimensional shape and the three-dimensional position of the three-dimensional propagation path model 43 based on the set value set input by the designated information input unit 126.

The influence detection unit 125 detects the influence tree 5. The influence detection unit 125 is, for example, a plane position (for example, a canopy) of a tree (for example, a canopy) that partially overlaps the three-dimensional propagation path model 43 from among one or more trees detected from the three-dimensional topography model. Latitude and longitude) exist in the 3D propagation path model, and a tree whose top altitude is in the 3D propagation path model or higher) is detected as an influence tree 5 that affects radio waves. The influence detection unit 125 may detect not only trees but also other objects satisfying the same positional conditions as described above as affecting the propagation of radio waves.

Further, the influence detection unit 125 may detect a tree having a portion that is positionally close to the three-dimensional propagation path model 43 within a predetermined distance as the influence tree 5. Alternatively, the influence detection unit 125 does not consider whether the portion of the three-dimensional terrain model that partially overlaps the three-dimensional propagation path model 43 or is close to the three-dimensional propagation path model 43 within a predetermined distance is a tree. , It may be detected as an influential tree (or an influential object) 5.

Further, after narrowing down the influence trees existing in the analysis target area by the three-dimensional propagation path model 43, the influence detection unit 125 uses a more accurate propagation path model (for example, a region figure using an ellipsoid). A more accurate analysis may be performed.

In the designated information input unit 126 described above, a set value set used for calculating the three-dimensional propagation path model is input by the user through the user terminal 13. The set value set input to the designated information input unit 126 is, for example, the three-dimensional position information (for example, the center thereof) of each of the relay objects 2 of the target pair (for example, the transmission / reception antenna 211 and the reflector 22 that exchange radio waves). Includes point latitude, longitude, altitude, etc.).

The three-dimensional position information includes three-dimensional position information and shape information (for example, in the case of a rectangle) of representative locations (for example, the antenna 211, the center of the reflector 22, and the four corners of the reflector 22) of the relay object 2 of the target pair. Vertical and horizontal dimensions, or diameter dimensions in the case of a circle), and three-dimensional transmission / reception angle information (for example, plane angle and elevation angle) for transmitting and receiving radio waves between the pair may be included. The set value set input to the designated information input unit 126 is not limited to the above set.

The designated information input unit 126 is not limited to inputting the set value set from the user through the user terminal 13, and may calculate the set value set based on the three-dimensional ground model and shooting information. Alternatively, the designated information input unit 126 has a learning function and detects the relay object 2 from the three-dimensional ground model by using the learning model that has learned the shape of the relay object 2 generated in the three-dimensional ground model. , The set value set of the relay material 2 may be calculated.

The display unit 127 displays the information from the radio wave propagation path maintenance system 12 on the user terminal 13. The display unit 127 uses a GUI (for example, at least one of a three-dimensional terrain model, a tree and a relay object 2 (radio wave transmission / reception tower 21 and a reflector 22 and the like) in the three-dimensional terrain model, and a three-dimensional propagation path model. Display on Graphical User Interface).

The user terminal 13 is carried by a user who uses the radio wave propagation path maintenance system 12, or is installed at a place where the user uses it. The user terminal 13 is, for example, a tablet, a smartphone, a personal computer, or the like. The user terminal 13 is not limited to being carried by the user, and may be provided in the radio wave propagation path maintenance system 12 or the drone 11.

The user terminal 13 is provided with a display device 131. The display device 131 presents information such as a GUI sent from the radio wave propagation path maintenance system 12 and input data input to the GUI. The display device 131 is, for example, a video output device such as a monitor or a screen.

FIG. 2 is a hardware configuration diagram of the radio wave propagation path maintenance system 12. The radio wave propagation path maintenance system 12 typically includes a storage (storage unit) 61, a CPU (Central Processing Unit) 62, a memory 63, and a communication unit 64. The storage 61 includes a shooting information acquisition unit 121, a three-dimensional terrain model generation unit 122, a tree detection unit 123, a three-dimensional propagation path model calculation unit 124, and an influence detection unit 125, which are executed by the CPU 62. A computer program that realizes the function with the designated information input unit 126 is recorded. For example, shooting information or a three-dimensional terrain model is recorded in the storage 61.

The CPU 62 realizes each function 121 to 126 of the radio wave propagation path maintenance system 12 by loading the computer program in the storage 61 into the memory 63 and executing the program.

The radio wave propagation path maintenance system 12 is connected to at least one user terminal 13 and at least one drone 11 via a network 65, for example, via wireless communication and / or wired communication. The radio wave propagation path maintenance system 12 and the user terminal 13 may be provided in one computer.

FIG. 3 is a flow chart of the processing process of the radio wave propagation path maintenance system 12. Hereinafter, the contents shown in FIG. 4 will be described as an example with respect to the processes S1 to S6 of the radio wave propagation path maintenance system 12. The processes S1 to S6 are not limited to the contents shown in FIG.

FIG. 4 is an explanatory diagram of radio wave propagation paths 4 (1) to 4 (3). The radio waves transmitted from the antenna 211 (1) of the radio wave transmitting / receiving tower 21 (1) are sequentially reflected by the reflectors 22 (1) and 22 (2), and then the antenna 211 (2) of the radio wave transmitting / receiving tower 21 (2). Received by 2).

The antenna 211 (1) transmits radio waves toward the reflector 22 (1). The reflector of the antenna 211 (1) is formed, for example, in a circular shape having a diameter of “d (m)”. As a result, the radio wave transmitted from the antenna 211 (1) propagates in a cylindrical space region having a diameter of “d (m)”. That is, the actual shape of the propagation path 4 (1) connecting the antenna 211 (1) and the reflector 22 (1) is, for example, a cylindrical shape having a diameter of “d (m)”.

The reflector 22 (1) reflects the radio wave from the antenna 211 (1) to the reflector 22 (2). The path through which radio waves propagate from the reflector 22 (1) to the reflector 22 (2) is referred to as a propagation path 4 (2). The actual shape of the propagation path 4 (2) is also, for example, a cylindrical shape having a diameter of “d (m)”.

The reflector 22 (2) reflects radio waves from the reflector 22 (1) to the antenna 211 (2). The path through which radio waves propagate from the reflector 22 (2) to the antenna 211 (2) is referred to as a propagation path 4 (3). The actual shape of the propagation path 4 (3) is also, for example, a cylindrical shape having a diameter of “d (m)”.

Returning to FIG. 3, the designated information input unit 126 acquires the designated information from the user terminal 13 (S1). The designated information input unit 126 may display, for example, an input field for inputting designated information (for example, a GUI as illustrated in FIG. 6) on the GUI of the user terminal 13. For example, the user inputs the three-dimensional position information of the propagation path 4 (1) to the designated information input unit 126 as the designation information of the target propagation path. The user inputs, for example, the three-dimensional position information of each of the antenna 211 (1) (radio wave transmission / reception tower 21 (1)) and the reflector 22 (1) as the designation information of the relay object of the target pair. It may be input to the unit 126. The input three-dimensional position information includes a set value set used for calculating the three-dimensional propagation path model 43 in step S5 of FIG. A detailed example of this set value set and a GUI for input will be described later with reference to FIG.

The shooting information acquisition unit 121 acquires shooting information from the drone 11 and stores it in the database in the storage 61 (S2). For example, the shooting information acquisition unit 121 sends the shooting information regarding the propagation path 4 (1) as the target propagation path to the three-dimensional terrain model generation unit 122 from the database of the shooting information acquired from the drone 11. The imaging information regarding the propagation path 4 (1) as the target propagation path is, for example, a large number of photographs of the ground region including the target region between the antenna 211 (1) and the reflector 22 (1) designated by the designated information. The photographic images of the above, and the position measurement information and the orientation measurement information of the camera 114 or the drone 11 at the time when the photographic images were taken are included.

The three-dimensional terrain model generation unit 122 generates a three-dimensional terrain model of the ground region including the target region based on the shooting information acquired from the shooting information acquisition unit 121 (S3). The three-dimensional terrain model generation unit 122 is based on, for example, a large number of photographic images of the ground region between the antenna 211 (1) and the reflector 22 (1), and a large number of features displayed in those images. Extract points.

The three-dimensional terrain model generation unit 122 includes position information in each photographic image of a large number of extracted feature points, and position measurement information and orientation measurement information at the time of shooting of each photographic image acquired from the shooting information acquisition unit 121. Based on, the three-dimensional position of each feature point is calculated.

The three-dimensional terrain model generation unit 122 connects the three-dimensional positions of a large number of feature points in a mesh shape to form a ground region including a target region between the antenna 211 (1) and the reflector 22 (1). Generate a 3D terrain model. The three-dimensional terrain model generation unit 122 may reflect (project) the color information of the captured image on the three-dimensional terrain model.

The display unit 127 causes the display device 131 to display the three-dimensional terrain model. The three-dimensional terrain model displayed on the display device 131 may be viewed from various directions by the user operating the GUI displayed on the display device 131.

The tree detection unit 123 detects each tree (a portion corresponding to each tree) existing in the three-dimensional terrain model (S4). As shown in FIG. 5, the display unit 127 causes the display device 131 to display the detected tree as the tree index 7. The tree detection unit 123 may display the top (or canopy) of each tree on the display device 131 as the tree index 7.

Next, the three-dimensional propagation path model 43 of step S5 shown in FIG. 3 is calculated, and the set value set input in the acquisition of the designated information in step S1 is used there. Here, before explaining the process of calculating the three-dimensional propagation path model 43, the input of the set value set in step S1 will be described more specifically.

The display unit 127 causes the display device 131 to display a GUI for inputting a set value set indicating three-dimensional position information regarding the relay object 2 of the target pair. FIG. 6 shows an example of the GUI, in which there are fields 1271 to 1273 for inputting three-dimensional position information of the relay material 2 of the target pair. For example, a column 1272 in which the three-dimensional position information of the antenna 211 (1), which is one relay object 2, is input, and a column in which the three-dimensional position information of the reflector 22 (1), which is the other relay object 2, is input. There is 1272 and a field 1273 in which the dimensions and sizes of the propagation path 4 (1) between the pairs are input.

In the column 1271, for example, a column 12711 in which the latitude of the representative location (for example, the center point) of the antenna 211 (1) is input, a column 12712 in which the longitude of the representative location of the antenna 211 (1) is input, and radio wave transmission / reception. A column 12713 in which the altitude of the ground surface of the tower 21 (1) is input and a column 12714 in which the height from the ground surface to the representative location of the antenna 211 (1) is input are shown. In the column 1271, not only the columns 12711 to 12714 are displayed, but also a column in which the transmission / reception angle information of the radio wave included in the set value set can be input may be displayed.

For example, "a1 (°)" is entered in the column 12711. For example, "b1 (°)" is entered in the column 12712. For example, "c1 (m)" is entered in the column 12713. For example, "e1 (m)" is entered in the column 12714. The values entered in each of the columns 12711 to 12714 are not limited to the values shown in the figure.

In the column 1272, for example, a column 12721 in which the latitude of the representative location (for example, the center point) of the reflector 22 (1) is input, and a column 12722 in which the longitude of the representative location of the reflector 22 (1) is input. A column 12723 in which the altitude of the ground surface of the reflector 22 (1) is input, and a column 12724 in which the height from the ground surface to the representative portion of the reflector 22 (1) is input are shown. In the column 1272, not only the columns 12721 to 12724 are displayed, but also a column in which the transmission / reception angle information and the like included in the set value set can be input may be displayed.

For example, "a2 (°)" is entered in the column 12721. For example, "b2 (°)" is entered in the field 12722. For example, "c2 (m)" is entered in the column 12723. For example, "e2 (m)" is entered in the column 12724. The values entered in each of the columns 12721 to 12724 are not limited to the values shown in the figure.

In the column 1273, for example, the column 12731 for inputting the shape of the propagation path 4 (1) (for example, the cross-sectional shape of the propagation path determined by the shape of the antenna) and the dimension of the shape of the propagation path 4 (1) are input. Column 12732 and is shown. For example, "circular" is entered in the field 12731. For example, "d (m)" is entered in the column 12732. The value entered in column 1273 is not limited to the value shown in the figure. The shape of the propagation path 4 is not limited to the shape of the reflector of the antenna 211 and the dimensions of the reflector.

Returning to FIG. 3, the three-dimensional propagation path model calculation unit 124 is 3 based on the set value set (that is, for example, the 3D position information of the relay object 2 of the target pair) input to the designated information input unit 126. The dimensional propagation path model 43 is generated (S5). Alternatively, the three-dimensional propagation path model calculation unit 124 calculates, for example, the three-dimensional position information of the relay object 2 of the target pair based on the three-dimensional topography model, and generates the three-dimensional propagation path model 43 based on the three-dimensional position information. May be good. Hereinafter, a case where the three-dimensional propagation path model 43 is generated based on the set value set input to the designated information input unit 126 will be described with reference to the flow chart of FIG. 7 and the explanatory diagram of FIG.

In the following description, the three-dimensional position information will be described using a Cartesian coordinate system having three axes of x-axis, y-axis, and z-axis.

The x-axis is set, for example, in the latitude (north-south) direction. The y-axis is set, for example, in the longitude (east-west) direction. The z-axis is set in the altitude direction. In the figure, the reference value in the z-axis direction (hereinafter, may be abbreviated as the reference value) may be indicated as "base".

The three-dimensional propagation path model calculation unit 124 acquires the three-dimensional position information of each relay object 2 (S51). The three-dimensional propagation path model calculation unit 124, for example, inputs “a1 (°)” in the column 12711 and “b1 (°)” input in the column 12712 as three-dimensional position information of the antenna 211 (1). Is acquired as a component in the x-axis direction and the y-axis direction of. The three-dimensional propagation path model calculation unit 124, for example, based on "c1 (m)" input in the column 12713 and "e1 (m)" input in the column 12714, z of the three-dimensional position information. The axial component is calculated as "c1 + e1 (m)".

For example, the three-dimensional propagation path model calculation unit 124 sets the “a2 (°)” input in the column 12721 and the “b2 (°)” input in the column 12722 as the three-dimensional position of the reflector 22 (1). It is acquired as a component of information in the x-axis direction and the y-axis direction. The three-dimensional propagation path model calculation unit 124 uses, for example, z of the three-dimensional position information based on "c2 (m)" input in the column 12723 and "e2 (m)" input in the column 12724. The axial component is calculated as "c2 + e2 (m)".

The three-dimensional propagation path model calculation unit 124 acquires or calculates the shape of the propagation path 4 (1) from the designated information input unit 126 as the shape (for example, the cross-sectional shape) of the three-dimensional propagation path model 43 (S52). The three-dimensional propagation path model calculation unit 124 acquires, for example, information that the actual shape of the propagation path 4 (1) is a circular shape having a diameter of “d (m)” from the column 1273 of the designated information input unit 126.

The three-dimensional propagation path model calculation unit 124 generates the three-dimensional propagation path model 43 (S53). The three-dimensional propagation path model calculation unit 124 propagates three-dimensionally based on, for example, the position information of the antenna 211 (1), the position information of the reflector 22 (1), and the cross-sectional shape information of the propagation path 4 (1). The road model 43 (1) is generated. The three-dimensional propagation path model calculation unit 124 has, for example, a three-dimensional position (a1, b1, c1 + e1) of a representative location (for example, a center point) of the antenna 211 (1) and a representative location (for example, the center) of the reflector 22 (1). A three-dimensional propagation path model 43 (1) formed in a columnar shape having a diameter of d (m) is generated, which linearly connects the three-dimensional positions (a2, b2, c2 + e2) of the points).

The three-dimensional propagation path model calculation unit 124 does not necessarily have to generate a three-dimensional propagation path model 43 that matches the actual shape of the propagation path 4. For example, it is slightly larger than the propagation path 4 and includes the propagation path 4. A three-dimensional propagation path model 43 may be generated. For example, as shown in FIG. 9, the three-dimensional propagation path model calculation unit 124 is formed so as to linearly connect the outer periphery of each reflector 22 between two opposing reflectors. Model 43 may be generated.

That is, the three-dimensional propagation path model calculation unit 124, for example, based on the three-dimensional position information, shape information, and dimensional information of the reflector 22 (1), the four corners 221 (1) to 224 (1) of the reflector 22 (1). Calculate the three-dimensional position information of 1). The three-dimensional propagation path model calculation unit 124 uses, for example, the four corners 221 (2) to 224 (2) of the reflector 22 (2) based on the three-dimensional position information, shape information, and dimensional information of the reflector 22 (2). Calculates the three-dimensional position information of.

The three-dimensional propagation path model calculation unit 124 generates the three-dimensional propagation path model 43a (2) so as to connect the four corners 221 (1) to 224 (1) and the four corners 221 (2) to 224 (2). The three-dimensional propagation path model calculation unit 124 calculates, for example, a square columnar three-dimensional propagation path model 43a (2) connecting the reflector 22 (1) and the reflector 22 (2).

When the cross-sectional shape of the propagation path 4 is circular, as shown in FIG. 10 (1), the three-dimensional propagation path model calculation unit 124 has a columnar shape formed so as to connect the opposing reflectors 22. The three-dimensional propagation path model 43b (2) may be generated. The three-dimensional propagation path model 43b (2) is formed in a columnar shape having, for example, a diameter set to the same “d (m)” (or a value slightly larger than that) of the propagation path 4.

As shown in FIG. 10 (2), the three-dimensional propagation path model calculation unit 124 may generate a three-dimensional propagation path model 43c (2) that surrounds a wider range than the opposing reflectors 22. The three-dimensional propagation path model calculation unit 124 generates, for example, a three-dimensional propagation path model 43c (2) of a quadrangular prism having a wider range than the reflection surface of the reflector 22. In this way, the cross-sectional dimension of the three-dimensional propagation path model 43 may be set to be larger than that of the propagation path 4, but the adjustment of the dimension may be manually performed by the user on the GUI, or a computer program. May be done automatically by.

Returning to FIG. 3, the influence detection unit 125 detects the influence tree 5 from one or more trees detected from the three-dimensional terrain model (S6). FIG. 11 is an explanatory diagram of the influence detection unit 125. FIG. 12 is a view of the three-dimensional propagation path model 43 (1) viewed from the direction A of FIG. The influence detection unit 125 detects a tree that partially overlaps the three-dimensional propagation path model 43 from the trees of the three-dimensional topography model (trees indicated by the tree index 7 in FIG. 5), and determines it as the influence tree 5. do.

That is, as shown in FIG. 11, the influence detection unit 125 has a position range (in the x-axis direction and the y-axis direction) of the three-dimensional propagation path model 43 (1) from among the trees of the three-dimensional topography model, for example. The tree existing in the inside is detected as the determination target tree 51. As shown in FIG. 12, the influence detection unit 125 has, for example, the height (h1) from the reference value to the top (or canopy) of the determination target tree 51 and the three-dimensional propagation path model 43 (1) from the reference value. Compare with the height (h2) to (for example, its lower surface).

In the influence detection unit 125, for example, the height (h1) from the reference value to the top (or canopy) of the determination target tree 51 is higher than the height (h2) from the reference value to the three-dimensional propagation path model 43 (1). Trees with high height are detected as affected trees 5. The influence detection unit 125 is not limited to detecting the influence tree 5 based on the height of the top (or canopy) of the determination target tree 51.

As shown in FIG. 11, the display unit 127 causes the display device 131 to display the influence index 71 indicating the influence tree 5. The influence index 71 is set in a format different from that of the tree index 7, for example. The display unit 127 may set, for example, different shapes, colors, sizes, patterns, etc. of the tree index 7 and the influence index 71.

Further, the influence detection unit 125 detects a tree located in the plane region of the three-dimensional propagation path model 43 and lower than the height from the reference value to the three-dimensional propagation path model 43 from among the trees in the three-dimensional topography region. , Prediction of trees that may affect Detect as tree 6. That is, the influence detection unit 125 detects trees that may affect the three-dimensional propagation path model 43 in the future.

In the influence detection unit 125, for example, the height (h3) from the reference value to the top (or canopy) of the determination target tree 51 is the height from the reference value to the three-dimensional propagation path model 43 (1) (for example, the lower surface thereof). Trees lower than (h4) are detected as predicted trees 8. The influence detection unit 125 has a height (h3) from the reference value to the top (or canopy) of the determination target tree 51 and a height (h4) from the reference value to the three-dimensional propagation path model 43 (1). When the difference between the two is within a predetermined length (for example, 2 m), it may be detected as the predicted tree 8.

Further, when the growth degree of the tree can be calculated by comparing with the past analysis result of the same place, even if the influence detection unit 125 detects the predicted tree 8 at an arbitrary future time point such as 1 year or 3 years later. good.

Moreover, the degree of growth of a tree may be given not only internally but also externally.

The display unit 127 causes the display device 131 to display the prediction index 72 indicating the prediction tree 8. The prediction index 72 is set in a format different from, for example, the tree index 7 and the influence index 71. The influence detection unit 125 may set, for example, different shapes, colors, sizes, patterns, etc. of the tree index 7 and the influence index 71 and the prediction index 72.

Since the radio wave propagation path maintenance system 12 shown above includes the three-dimensional propagation path model calculation unit 124, it is possible to calculate the three-dimensional propagation path model 43 representing the radio wave propagation path that cannot be directly obtained by photography. .. As a result, the radio wave propagation path maintenance system 12 can automatically detect trees that affect the propagation of radio waves. As a result, the radio wave propagation path maintenance system 12 can help the amount of work for detecting trees that affect the propagation of radio waves.

By generating the three-dimensional propagation path model 43, the three-dimensional propagation path model calculation unit 124 can detect a tree whose top reaches the propagation path 4 or is higher than the propagation path 4 as the affected tree 5. As a result, trees that affect radio waves can be cut down, and trees that do not affect radio waves can be left.

By providing the influence detection unit 125, the radio wave propagation path maintenance system 12 can display the influence index 71, which is set in a shape different from the tree index 7, on the display device 131. As a result, the user can easily grasp the affected tree 5 from among a large number of trees. As a result, the usability of the radio wave propagation path maintenance system 12 is improved.

By providing the influence detection unit 125, the radio wave propagation path maintenance system 12 can display the prediction index 72 set in a shape different from the tree index 7 and the influence index 71 on the display device 131. As a result, the user can easily grasp the predicted tree 8 from among a large number of trees. As a result, the usability of the radio wave propagation path maintenance system 12 is improved.

Since this embodiment corresponds to a modified example of the first embodiment, the differences from the first embodiment will be mainly described. The radio wave propagation path maintenance system 12 can improve the accuracy of generating the three-dimensional propagation path model 43 by including the designated information input unit 126a.

FIG. 13 is an explanatory diagram of the designated information input unit 126a. In the designated information input unit 126a, the user inputs the three-dimensional position information including the set value set used in the three-dimensional propagation path model calculation unit 124. The set value set input to the designated information input unit 126a includes, for example, three-dimensional position information of the antenna 211, shape information of the antenna 211, transmission angle information for transmitting radio waves of the antenna 211, and three-dimensional position information of the reflector 22. Includes shape information of the reflector 22, reflection angle information of the reflector 22, and the like.

The user selects the relay material 2 of the target pair, and inputs the three-dimensional position information thereof from the user terminal 13 to the designated information input unit 126a. The designated information input unit 126a acquires the information of the relay material 2 of the selected pair from the user terminal 13.

The display unit 127 displays on the display device 131 the fields 1272 to 1274 for inputting the three-dimensional position information of the relay object 2 of the pair. The display unit 127 displays, for example, a field for inputting three-dimensional position information regarding the antenna 211 (1) and the reflector 22 (1) on the display device 131.

The display unit 127 is, for example, a column 1272 in which the three-dimensional position information of the reflector 22 (1) is input, a column 1273 in which the shape and dimensions of the propagation path 4 (1) are input, and an antenna 211 (1). The field 1274 in which the three-dimensional position information is input is displayed on the display device 131. In these columns 1272 to 1274, the positions of the antenna 211 (1) and the reflector 22 (1) set in advance (for example, set in the design drawing of the antenna 211 (1) and the reflector 22 (1)). 3D position information based on the shape and shape is input.

Further, the display unit 127 displays an additional field 1275 in which the three-dimensional position information of the antenna 211 (1) is input on the display device 131. In this additional column 1275, the three-dimensional position information of the antenna 211 obtained from the three-dimensional terrain model is input. That is, for example, the user looks at the three-dimensional terrain model displayed on the display device 131, finds and specifies the antenna 211 from the three-dimensional terrain model, and thereby, the three-dimensional position of the antenna 211 (1) based on the three-dimensional terrain model. Information is identified and this is entered in field 1275. Alternatively, the designated information input unit 126a automatically detects the antenna 211 (1) from the three-dimensional terrain model, obtains the three-dimensional position information from the three-dimensional terrain model, and inputs it to the column 1275.

The display unit 127 causes the display device 131 to display the preset three-dimensional position information of the antenna 211 (1) input in the field 1274 as the “set position” 23. The display unit 127 causes the display device 131 to display the three-dimensional position information of the antenna 211 (1) based on the three-dimensional terrain model input in the column 1275 as the “model position” 24. There is usually a difference between the set position 23 of the antenna 211 (1) and the model position 24. That is, the set position 23 of the antenna 211 (1) will substantially indicate the actual position of the antenna 211 (1). On the other hand, since the model position 24 may include a gore corresponding to an error in position measurement or orientation measurement during photography by the drone 11, it often deviates slightly from the set position 23. The difference between the set position 23 and the model position 24 is that the three-dimensional terrain model generated based on the shooting information and the three-dimensional transmission line model generated based on the preset three-dimensional position information. In the meantime, it makes a positional difference.

The set position 23 and the model position 24 (or the difference between the two) of the antenna 211 (1) input to the columns 1272 and 1275, respectively, are the three-dimensional terrain model generation unit 122, the three-dimensional propagation path model calculation unit 124, or the three-dimensional propagation path model calculation unit 124. It is sent to the impact detector 25, where it may be used to correct the above positional differences between the 3D terrain model and the 3D transmission line model. For example, by utilizing the above difference, the coordinate system of the 3D terrain model can be matched with the coordinate system of the 3D transmission line model, or the coordinate system of the 3D transmission line model can be matched with the coordinate system of the 3D terrain model. can. As a result, the accuracy of detecting affected trees is improved.

Further, once the three-dimensional terrain model is completed, the designated information input unit 126a causes the user to select an arbitrary relay object 2 on the three-dimensional terrain model by displaying it on the display device 131 of the user terminal 13. , The surrounding situation of the selected relay material 2 can be shown to the user. In that case, the designated information input unit 126a is an index indicating the set position 23 at a position corresponding to the set position 23 of the target relay object 2 (for example, the antenna 211 (1)) on the displayed three-dimensional terrain model. Is displayed. The index of the set position 23 of the target relay object 2 displayed may be slightly deviated from the position of the image of the target relay object 2 appearing in the three-dimensional terrain model. However, the user can find the target relay object 2 (for example, the antenna 211 (1)) on the three-dimensional terrain model by searching the vicinity of the displayed index of the set position 23 as a mark. It will be easier. As a result, the designated information input unit 126a can improve the usability of the radio wave propagation path maintenance system 12.

Since this embodiment also corresponds to a modified example of the first embodiment, the differences from the first embodiment will be mainly described. In the radio wave propagation path maintenance system 12 of this embodiment, one of the radio wave relays 2 (tower 21, reflector 22, etc.) is not in the forest area, and therefore, the three-dimensional terrain model is based on the photographing information acquired from the drone 11. This is a case where it is sufficient to skip the drone 11 and acquire the shooting information only for the forest area without creating the above in all of the propagation paths 4.

As an example, as shown in FIG. 14, only a part of the propagation path 4 is photographed by the drone 11, so that the actual ground surface grasped based on the three-dimensional terrain model is only a part of the propagation path 4. Consider a case. In order to confirm the existence of the affected trees 5 for all of the propagation paths 4, it is necessary to confirm the height of the ground surface and which area of the propagation path 4 is the forest area in all of the propagation paths 4.

Therefore, in this embodiment, as shown in FIG. 15, external three-dimensional data issued by the Geographical Institute and the like, for example, GIS (Geographic Information System) data, except for the range photographed by the drone 11. The height from the ground surface to the 3D propagation path model 43 (or the height h2 from the reference value shown in FIG. 12 to the 3D propagation path model 43) is obtained, and the drone covers the range not yet photographed by the drone 11. It is made to judge whether or not to take a picture by 11. In particular, when the external 3D data includes land use information and information for managing tree planting results, it is possible to determine whether or not the area not photographed by the drone 11 is a forest area. It is possible to more reliably determine whether or not to take a picture with the drone 11 based on the above.

In the following explanation, before taking a picture with the drone 11, the height from the ground surface to the 3D propagation path model 43 is first determined based on the external 3D data, and further, the forest area is determined based on the external 3D data. Will be described, and an example of determining whether or not to take a picture with the drone 11 for the specified forest area will be described.

In this embodiment, as shown in FIG. 15, the three-dimensional propagation path model 43 is a quadrangular prism circumscribing the first Fresnel zone 430, which is preferably unobstructed in the propagation path 4 from the antenna 211. It is assumed to be a shape. The first Fresnel zone has a rotating elliptical shape with the paired relay material 2 as the focal point.

FIG. 16 is a diagram showing an example of a screen displayed on the display device 131 of the user terminal 13 in the radio wave propagation path maintenance system 12 of this embodiment. A three-dimensional propagation path model 43 is set between the paired relay objects 2, and further, of the height (separation distance) between the ground surface and the three-dimensional propagation path model 43 based on the external three-dimensional data. A circle is displayed at a position close to the three-dimensional propagation path model 43 (that is, the separation distance is short). Further, based on the external three-dimensional data, it is displayed that the forest area 80 exists in the area including between the paired relays 2.

The three-dimensional terrain model generation unit 122 of the radio wave propagation path maintenance system 12 calculates the height (separation distance) between the ground surface and the three-dimensional propagation path model 43 based on the external three-dimensional data, and displays the display unit 127. The separation distance and a message based on the separation distance are displayed on the display device 131 of the user terminal 13. In the example shown in FIG. 16, although the separation distance is short, it is not a forest area, so it is not necessary to take a picture with the drone 11, and since the separation distance is short and it is a forest area, it is recommended to take a picture with the drone 11. Message is displayed.

Next, an obstacle detection procedure by the radio wave propagation path maintenance system 12 of this embodiment will be described with reference to the flowcharts of FIGS. 17 to 20.

FIG. 17 is a flowchart for explaining the operations of the tree detection unit 123, the three-dimensional propagation path model calculation unit 124, and the influence detection unit 125 of the radio wave propagation path maintenance system 12 of this embodiment.

First, the three-dimensional propagation path model calculation unit 124 obtains the coordinates of the vertices of the square pillars constituting the three-dimensional propagation path model 43 from the position coordinates of the relay object 2 (antenna 211 or the like) and the width of the propagation path 4 ( Step S101). Next, the three-dimensional propagation path model calculation unit 124 obtains the boundary surface from the vertices of the square pillars constituting the three-dimensional propagation path model 43 (step S102).

Next, the tree detection unit 123 acquires the coordinates of the canopy and stores them in the array (step S103). The details of the operation of step S103 will be described later.

Next, the influence detection unit 125 acquires the coordinates of each canopy from the coordinate array of the canopy acquired in step S103 (step S104), and obtains the canopy coordinates and the three-dimensional propagation path model 43 on the XY plane (see FIG. 8). The inside / outside determination with the constituent square columns is performed (step S105).

Further, the influence detection unit 125 determines the inside and outside of the canopy coordinates and the square pillars constituting the three-dimensional propagation path model 43 in the three-dimensional space, and if there are canopy coordinates existing inside the square pillars, the canopy coordinates are used. It is determined that the tree to have is a tree currently obstructing the propagation path 4 (step S106). Further, a tree determined to exist inside the square pillar in step S105 but determined not to interfere with the propagation path 4 in step S106 is a tree that may interfere with the propagation path 4 in the future. (Step S107). Then, the operations of steps S104 to S107 are performed for all the arrays (step S108).

Next, FIG. 18 is a flowchart for explaining the operation of specifying the canopy coordinates by the tree detection unit 123 of the radio wave propagation path maintenance system 12 of this embodiment, and is a flowchart showing the details of step S103 of FIG. ..

First, the tree detection unit 123 acquires a DSM (Digital Surface Model) of the target area (step S111). DSM is three-dimensional data consisting of the elevation of the ground surface and the surface of the feature above it, and includes the height of buildings and trees. In the radio wave propagation path maintenance system 12 of this embodiment, the DSM is acquired from the photographed data by the drone 11.

Next, the tree detection unit 123 acquires a DEM (Digital Elevation Model) of the target area (step S112). In the radio wave propagation path maintenance system 12 of this embodiment, the DEM used is that provided by the Geospatial Information Authority of Japan.

Next, the tree detection unit 123 calculates the difference between the DSM acquired in step S111 and the DEM acquired in step S112 (step S113). This difference becomes the DCHM (Digital Canopy Height Model: canopy image). Then, the tree detection unit 123 applies a local maximum filter to the DCHM acquired in step S113 to extract the canopy and acquire its coordinates.

Next, FIG. 19 is a flowchart for explaining an operation of calculating the canopy coordinates of a tree that may interfere with the future propagation path 4 by the influence detection unit 125.

First, the influence detection unit 125 acquires the sequence calculated in step S107 of FIG. 17 (step S121). Next, the influence detection unit 125 acquires the canopy coordinates of the tree that may interfere with the propagation path 4 in the future from the sequence acquired in step S121 (step S122).

Next, the influence detection unit 125 calculates the distance between the bottom surface of the square pillar constituting the three-dimensional propagation path model 43 and the canopy coordinates acquired in step S122 (step S123). After that, the operations of steps S122 to S123 are performed for all the arrays (step S124).

Then, FIG. 20 shows an operation in which the display unit 127 displays a tree that may interfere with the propagation path 4 and a tree that may interfere with the propagation path 4 in the future on the screen of the display device 131 of the user terminal 13. It is a flowchart for demonstrating.

First, the display unit 127 searches for the canopy coordinates created in the flowchart of FIG. 18 (step S131). Next, the display unit 127 extracts the canopy of the tree that may interfere with the propagation path 4 and the canopy of the tree that may interfere with the propagation path 4 in the future, which are acquired in the flowchart of FIG. 17 (step S132). ). Next, the display unit 127 acquires the distance between the canopy of the tree that may interfere with the propagation path 4 in the future and the bottom surface of the square pillar constituting the propagation path 4, which is acquired in the flowchart of FIG. 19 ( Step S133). Then, the display unit 127 displays the canopy of the tree that may interfere with the propagation path 4 and the canopy of the tree that may interfere with the propagation path 4 in the future on the display device 131, and lists these canopies. A table is generated and displayed on the display device 131 (step S134).

Therefore, according to the radio wave propagation path maintenance system 12 of the present embodiment, the area (forest area) to be photographed by the drone 11 can be easily specified in the area including the relay object 2, and the relay object 2 can be easily specified. It is not necessary to take a picture with the drone 11 for all the areas including. As a result, the obstacle detection operation by the radio wave propagation path maintenance system 12 can be easily performed in a short time.

In addition, according to the radio wave propagation path maintenance system 12 of the present embodiment, since the shape of the three-dimensional propagation path model 43 is a square pillar, the obstacle determination work can be performed in a short time and easily. In addition, by forming the quadrangular prism in the shape of a quadrangular prism circumscribing the first Fresnel zone 430, the obstacle detection operation can be ensured.

For example, as shown in FIG. 4, the relay material 2 in the radio wave propagation path maintenance system 12 of this embodiment includes the reflector 22. At this time, as shown in FIG. 21, the three-dimensional propagation path model 43 is formed into a spheroidal shape corresponding to the first Fresnel zone 430, and the diameter of the reflecting plate 22 is set to be larger than the diameter of the first Fresnel zone 430. Therefore, obstacle detection for radio waves propagating between the relay objects 2 can be ensured.

The present invention is not limited to the above-described embodiment, and includes various modifications. The above-described embodiment has been described in detail in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to the one including all the described configurations. It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. In addition, other configurations can be added / deleted / replaced with respect to a part of the configurations of each embodiment.

11 ... Drone, 111 ... Flying device, 112 ... Position measuring device, 113 ... Orientation measuring device, 114 ... Camera, 12 ... Radio wave propagation path maintenance system, 121 ... Shooting Information acquisition unit, 122 ... 3D terrain model generation unit (generation unit), 123 ... tree detection unit (second detection unit), 124 ... 3D propagation path model generation calculation unit (calculation unit), 125 ... Impact detection unit (first detection unit), 126 ... Designated information input, 127 ... Display unit, 13 ... User terminal, 131 ... Display device, 2 ... Relay material, 21 ... Radio wave transmission / reception tower, 211 ... Antenna, 22 ... Reflector, 4 ... Propagation path, 5 ... Influence tree, 43 ... Three-dimensional propagation path model, 430 ... No. 1 Frenel zone

Claims (15)

An acquisition unit that acquires shooting information obtained by a shooting device that shoots the ground area between multiple relays that exchange radio waves.
A calculation unit that indicates the three-dimensional position of the propagation path through which the radio wave propagates, and calculates a three-dimensional propagation path model in which the shape on the plane orthogonal to the line connecting the plurality of relay objects is constant.
A radio wave propagation path maintenance system including a first detection unit that detects an influential object that affects the propagation of the radio wave based on the shooting information and the three-dimensional propagation path model. The calculation unit according to claim 1, wherein the calculation unit calculates the three-dimensional propagation path model between the relays of the pair based on the three-dimensional position information of each of the relays of adjacent pairs among the plurality of relays. Radio propagation path maintenance system. The third-dimensional position information according to claim 2, wherein the three-dimensional position information includes information on the position of a representative portion of each of the plurality of relays, the shape of each of the plurality of relays, and the dimensions of each of the plurality of relays. Radio wave propagation path maintenance system. Further, the radio wave propagation path maintenance system is a generation unit that generates a three-dimensional terrain model showing a three-dimensional position and a three-dimensional shape of various objects in the ground region based on the shooting information obtained by the acquisition unit. With
The radio wave propagation path maintenance system according to any one of claims 1 to 3, wherein the first detection unit detects the influential object based on the three-dimensional terrain model and the three-dimensional propagation path model. Further, the radio wave propagation path maintenance system includes a second detection unit that detects at least one tree existing in the three-dimensional terrain model.
The radio wave propagation path maintenance system according to claim 4, wherein the first detection unit detects a tree overlapping the three-dimensional propagation path model as the influence substance. Further, the radio wave propagation path maintenance system includes a display unit that displays information from the radio wave propagation path maintenance system on a user terminal.
The display unit displays a tree index indicating the tree detected by the second detection unit on the user terminal.
The radio wave propagation path maintenance system according to claim 5, wherein the display unit displays an influence index indicating the influence substance detected by the first detection unit on the user terminal in a format different from that of the tree index. The first detection unit further
Trees that are predicted to affect the propagation of radio waves in the future are detected as predictive influences,
The radio wave propagation path maintenance system according to claim 6, wherein the display unit displays a prediction index indicating the prediction influence on the user terminal in a format different from the tree index and the influence index. Further, the radio wave propagation path maintenance system includes a display unit that displays information from the radio wave propagation path maintenance system on the user terminal.
It is provided with an input unit for inputting a preset setting position of each of the plurality of relay objects.
The display unit is either claim 4 or 5, which displays the three-dimensional terrain model generated by the generation unit and the index indicating the set position input to the input unit on the user terminal. The radio wave propagation path maintenance system according to item 1. The radio wave propagation path maintenance system according to any one of claims 4 to 7, wherein the calculation unit obtains three-dimensional position information of each of the plurality of relay objects based on the three-dimensional terrain model or the shooting information. The radio wave propagation path maintenance system according to any one of claims 1 to 9, wherein the shooting information includes a photographic image taken by a camera provided in a flying aircraft. The radio wave propagation path maintenance system according to any one of claims 1 to 10, wherein the three-dimensional propagation path model has a cylindrical shape. The radio wave propagation path maintenance system according to any one of claims 1 to 10, wherein the three-dimensional propagation path model has a quadrangular prism shape having a right-angled cross section. The radio wave propagation path maintenance system according to claim 12, wherein the three-dimensional propagation path model has a quadrangular prism shape circumscribing the first Fresnel zone of the propagation path. The three-dimensional propagation path model is the first Fresnel zone of the propagation path.
The radio wave propagation path maintenance according to any one of claims 1 to 10, wherein the diameter of the reflector of the relay material that reflects the radio waves is larger than the diameter of the first Fresnel zone of the propagation path. system. A second acquisition unit that acquires topographical data of the ground area between multiple relays that exchange radio waves,
A calculation unit that indicates the three-dimensional position of the propagation path through which the radio wave propagates, and calculates a three-dimensional propagation path model in which the shape on the plane orthogonal to the line connecting the plurality of relay objects is constant.
Based on the topographical data and the three-dimensional propagation path model, a first detection unit that detects an influential object that affects the propagation of the radio wave, and a first detection unit.
A radio wave propagation path maintenance system including a radio wave propagation path maintenance unit that determines whether or not to shoot a shooting region that is at least a part of the ground region by a shooting device based on the detection result of the first detection unit.

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