Interference evaluation method, interference evaluation device, and interference evaluation program

Abstract

The present interference evaluating method, which is to be executed by the present interference evaluating device, comprises: a step of deriving the coordinates of an evaluation range in a real space on the basis of a range designated by use of a map, and deriving the coordinates of a radio station in the real space on the basis of a position designated by use of the map; a step of deriving, on the basis of the coordinates of the evaluation range and the coordinates of the radio station, the interference level of radio waves transmitted from the radio station with respect to the evaluation range; and a step of displaying, on a display unit, an image in accordance with the interference level. The interference evaluating method may further comprise: a step of deriving, on the basis of a second range designated in the first range by use of the map, the coordinates of a path range that can include three-dimensional paths in the real space; and a step of deriving the coordinates of the three-dimensional paths on the basis of paths designated by use of the map.

Description

Technical Field

[0001] The present invention relates to an interference evaluation method, an interference evaluation apparatus, and an interference evaluation program.

Background Art

[0002] In the interference evaluation of radio waves in wireless communication, the positions of a plurality of radio stations using radio waves of the same frequency are adjusted according to the result of the interference evaluation. For example, the radio stations may be arranged at positions separated from each other by a distance corresponding to the result of the interference evaluation.

[0003] FIG. 25 is a diagram showing a first example of a screen of an interference evaluation result (an example of the result of interference evaluation by interference evaluation software). In FIG. 25, for the range subjected to interference evaluation, an interference tolerance area where coexistence with another wireless communication system is possible is displayed on the map without hatching. Further, an interference area that requires a review of the operation and installation conditions of another wireless communication system is distinguished by hatching and displayed on the map (see Non-Patent Document 1).

[0004] FIG. 26 is a diagram showing a second example of a screen of an interference evaluation result. In FIG. 26, the position of the interfered station is represented by a triangle on the map. The ridge distance, which is the distance from the interfered station to the ridge, is represented by a dashed line circle surrounding the interfered station. The separation distance considering the ridge distance (the separation distance with a ridge) is represented by a dotted line circle. Further, the separation distance that becomes the worst value in the separation distance not considering the ridge distance (the separation distance without a ridge) is represented by a solid line circle (see Patent Document 1).

[0005] Figure 27 is a diagram showing an example of a screen of the evaluation result of the radio wave arrival area. In Figure 27, one interfering station (black circle) and three interfered stations (Interfered Station A, Interfered Station B, Interfered Station C) (white circles) are illustrated on the map. The antenna direction of the interfering station is indicated by a dashed arrow. The evaluation range including one interfering station and three interfered stations is divided into meshes. In each mesh, the arrival area of the radio wave transmitted from the interfering station is distinguishable by using a plurality of types (power levels of radio wave arrival: ≤ -51 dBm, -41 to -50 dBm, -31 to -40 dBm, -21 to -30 dBm, -10 to -20 dBm) of hatching (see Patent Document 2).

[0006] The results of these interference evaluations are represented on a two-dimensional map, for example, by color-coding of regions. Thus, the user can confirm how to adjust the placement of radio stations according to the interference evaluation for shared use with other wireless communication systems.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Non-Patent Documents

[0008]

Non-Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0009] In order for the result of interference evaluation to be displayed, it is necessary that the evaluation range and the positions of the radio stations be given in advance to the interference evaluation apparatus. When the user designates the evaluation range and the positions of the radio stations, the evaluation range and the positions of the radio stations (longitude and latitude) must be input to the interference evaluation apparatus numerically. Also, in the adjustment of the positions of the radio stations, while the user changes the positions of the radio stations etc., the evaluation result of interference is derived. Here, the user is required by the interference evaluation apparatus to input the evaluation range and the positions of the radio stations each time the evaluation conditions of interference are changed.

[0010] For this reason, a user (operator) who uses the interference evaluation software (interference evaluation tool) operating in the interference evaluation apparatus cannot intuitively grasp the designated evaluation range and the positions of the radio stations. Therefore, the evaluation range may be too narrow or too wide. Also, as the position where the radio station is arranged, a position outside the evaluation range may be erroneously input to the interference evaluation apparatus. In such a case, the expected result of interference evaluation cannot be obtained.

[0011] FIG. 28 is a diagram showing an example of a designation screen of an evaluation range (execution conditions). In FIG. 28, as “interfering / interfered information”, the interfering stations (“Station 2”, “Station 3”) and the interfered stations (“Station 4”, “Station 1”) are listed. In FIG. 28, as the positions of the interfering stations and the interfered stations, numerical values of latitude and longitude are shown in the interfering / interfered information setting column 400. The latitudes and longitudes of the upper left coordinates and the lower right coordinates of the evaluation range designated as the area to be interfered with are displayed in the area designation setting column 410 where numerical values can be set. Also, FIG. 28 shows an interfering station antenna direction setting column 420.

[0012] FIG. 29 is a diagram showing an example of a designation screen of the radio station position (edit screen of the radio station database). That is, FIG. 29 is a screen for setting, confirming, and changing the information regarding “Station 4” among the interfered stations listed in the interfering / interfered information. On the radio station position designation screen, there are columns for the user to enter numerical values of latitude, longitude, and altitude as the position of “Station 4”. Here, the columns for entering the numerical values of the latitude, longitude, and altitude of the radio station position are the radio station position setting column 430.

[0013] When the "Save" button in the lower right corner in FIG. 29 is pressed, among the interference information and the interfered information on the execution condition specification screen shown in FIG. 28, "Latitude 1" and "Longitude 1" indicating the position of the interfered station "Station 4" are changed. Further, the changed latitude and longitude numerical values (for example, "35.73XX", "139.94XX") are reflected as the position of the interfered station "Station 4".

[0014] As described above, for the specification of the interference evaluation range and the setting of the position of the radio station, latitude and longitude are input into the interference evaluation device numerically. Therefore, it is not necessary to prepare related information in advance, which is troublesome for the user. For example, the latitude and longitude numerical values at each end of the evaluation range in the real space are prepared before the interference evaluation is executed. Also, the latitude and longitude numerical values of the position of the radio station are prepared before the interference evaluation is executed.

[0015] Further, when numerical values are input into the interference evaluation device, it is difficult for the user to intuitively understand the evaluation range and the position of the radio station. Thus, in interference evaluation, there is a problem that the operation of specifying the evaluation conditions for radio wave interference is troublesome.

[0016] In view of the above circumstances, an object of the present invention is to provide an interference evaluation method, an interference evaluation device, and an interference evaluation program that can reduce the labor of the operation of specifying the evaluation conditions for radio wave interference.

Means for Solving the Problem

[0017] One aspect of the present invention is an interference evaluation method executed by an interference evaluation device, including steps of deriving coordinates of an evaluation range in real space based on a first range specified using a map, and deriving coordinates of a radio station in the real space based on a position specified using the map; deriving an interference level of radio waves transmitted from the radio station for the evaluation range based on the coordinates of the evaluation range and the coordinates of the radio station; and displaying an image corresponding to the interference level on a display unit.

[0018] One aspect of the present invention is a interference evaluation apparatus including a position derivation unit that derives coordinates of an evaluation range in real space based on a first range specified using the above map and derives coordinates of a radio station in the real space based on a position specified using the map, an interference derivation unit that derives an interference level of radio waves transmitted from the radio station for the evaluation range based on the coordinates of the evaluation range and the coordinates of the radio station, and an image processing unit that displays an image corresponding to the interference level on a display unit.

[0019] One aspect of the present invention is an interference evaluation program for causing a computer to function as the above interference evaluation apparatus.

Advantages of the Invention

[0020] According to the present invention, it is possible to reduce the labor of the operation for specifying the evaluation conditions of radio wave interference.

Brief Description of the Drawings

[0021]

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Embodiments for Carrying Out the Invention

[0022] Embodiments of the present invention will be described in detail with reference to the drawings. (First Embodiment) The setting (specification) of an evaluation range, which is one of the derivation conditions of interference evaluation, the setting (specification), confirmation, and change of the position of a radio station, which is one of the derivation conditions of interference evaluation, are made possible on the displayed map by the following three-step procedure exemplified below.

[0023] In the first step, the positions (coordinates) of the upper left corner and the lower right corner of the evaluation range specified on the map are changed to numerical values of latitude and longitude. The converted numerical values of latitude and longitude are input into the interference evaluation device as the latitude and longitude of the evaluation range.

[0024] In the second step, the interference evaluation device confirms with the user whether it is necessary to correct the evaluation range set on the map. If correction is necessary, the interference evaluation device returns the process to the first step. As a result, the evaluation range is reset. If correction is not necessary, the interference evaluation device proceeds with the process to the third step.

[0025] In the third stage, the user operates an operation unit such as a mouse. In response to a position designation operation (point operation) or the like by the user, the position of the radio station is set on the map. The set position of the radio station is displayed on the map. In particular, similar to the evaluation range in the first stage, the position of the radio station designated on the map is converted into latitude and longitude. The converted numerical values are used for interference evaluation as the position of the radio station. If necessary, the position of the radio station may be corrected. Also, the positions of other radio stations (base stations) may be added to the map.

[0026] FIG. 1 is a diagram showing a configuration example of an interference evaluation apparatus 1a in the first embodiment. The interference evaluation apparatus 1a is an information processing apparatus that evaluates radio wave interference. The interference evaluation apparatus 1a includes a control unit 10a, a memory 11, a storage device 12, a communication unit 13, an operation unit 14, and a display unit 15. The control unit 10a includes an evaluation range derivation unit 100, a position derivation unit 101, an interference derivation unit 102a, and an image processing unit 103a.

[0027] The image displayed on the display unit 15 is, for example, an image of a map including an evaluation range. This map includes horizontal position information. Also, this map may include vertical position information (altitude).

[0028] The evaluation range derivation unit 100 acquires a signal corresponding to an operation by the user from the operation unit 14. The signal corresponding to the operation is, for example, an operation (point operation) that designates a position (coordinates on the map) in the image displayed on the display unit 15.

[0029] The position derivation unit 101 converts the position (coordinates on the map) designated on the displayed image into a position (coordinates) in the real space. For example, the position derivation unit 101 converts the coordinates designated on the displayed map using the operation unit 14 (for example, a mouse) into latitude and longitude in the real space.

[0030] The interference derivation unit 102a derives the interference of radio waves from the interfering station (radio station) for the evaluation range specified on the map according to the operation by the user. The image processing unit 103a generates an image to be displayed on the display unit 15. The image displayed on the display unit 15 is, for example, a map. The evaluation result of radio wave interference may be superimposed on the displayed map.

[0031] The memory 11 reads programs and data from the storage device 12. The storage device 12 stores in advance an interference evaluation program, map data, and specifications data of radio stations (for example, frequency data, position data, etc.).

[0032] The communication unit 13 executes communication with a predetermined external device (not shown). The operation unit 14 receives operations by the user. The operation unit 14 is, for example, a mouse, a trackball, or a touch panel. The mouse may be provided with a wheel.

[0033] The display unit 15 is a display device. For example, the display unit 15 is a liquid crystal display or an organic EL (organic electro-luminescence) display. The display unit 15 may be integrated with the operation unit 14 (touch panel).

[0034] FIG. 2 is a diagram showing an example of a screen for specifying an evaluation range in the first embodiment. It is a place where a map is displayed according to the screen size. Using the pointer (arrow pointing upward to the left) on this map display, the evaluation range and the position of the interfering station are set and changed. In the operation mode of specifying the evaluation range, the operator (user) clicks the left button of the operation unit 14 (mouse) at the position of the pointer 201-1 on the map. As a result, the latitude and longitude of the position that becomes the upper left corner of the evaluation range are numerically converted and set.

[0035] Subsequently, the operator (user) clicks the left button of the operation unit 14 (mouse) at the position of the pointer 201-2 on the map. As a result, the latitude and longitude of the lower right corner of the evaluation range are numerically converted and set. With such a simple operation using the pointer (mouse), the evaluation range can be set on the map in an operation that is easy for the user to understand. In addition, to change the evaluation range, the previously specified evaluation range can be cleared (the numerical values set in the entry fields for the latitude and longitude of the upper left corner and the lower right corner are deleted once), and the evaluation range can be set again as described above. Also, when the evaluation range is specified within the range surrounded by the dotted line on the map shown in FIG. 2, at the upper left corner of the evaluation range, while selecting (dragging) the upside-down L shape with the pointer, move it to the position where you want to make a change and release it. With this operation, it can be changed to the desired position. The lower right corner (left-right upside-down L shape) of the evaluation range can be operated in the same way. When only one of the upper left corner or the lower right corner is to be changed, after selecting only the corner to be changed and then moving it to the desired position and releasing it, the evaluation range can be changed.

[0036] Next, an operation method for setting the position of the radio station for interference evaluation will be described. In the operation mode for designating the radio station (the interfering station in the figure), the operator (user) clicks the left button of the operation unit 14 (mouse) at the position of the pointer 201-3 on the map. As a result, the position where the interfering station 210 is to be installed (a predetermined position within the evaluation range) is numerically converted into latitude and longitude in the real space. Also, the numerical conversion result of the position where the interfering station 210 is to be installed is set.

[0037] When the user performs the designation operation using the mouse in this way, the designation status of the interference evaluation range is displayed on the map using the dotted enclosure, the upside-down L shape at the upper left corner, and the left-right upside-down L shape at the lower right corner. This facilitates the user's operation of installing a radio station within the evaluation range. Of course, when the user wants to specify the evaluation range in a range far from the interfering station 210 and examine the interference in the evaluation range in detail, the interfering station 210 may be installed outside the evaluation range on the map.

[0038] In addition, if the position of the radio station (interfering station 210) is specified on the map prior to the specification of the evaluation range, a triangular mark (hatched triangular mark) representing the interfering station 210 is displayed on the map. Additionally, if it is possible to set and display multiple interfering stations on the map, or to display the interfered station with different mark types and colors, the user can easily set the evaluation range including all radio stations (interfering stations and interfered stations). Also, the user can easily set an evaluation range that selectively surrounds some of all the radio stations on the map.

[0039] Next, an operation example of the interference evaluation device 1a will be described. FIG. 3 is a flowchart showing an operation example of the interference evaluation device 1a in the first embodiment. The interference evaluation device 1a sets the evaluation range of interference on the map according to a user operation as one of the interference evaluation conditions (step S101).

[0040] The interference evaluation device 1a displays the evaluation range on the map. The interference evaluation device 1a checks whether the set evaluation range needs to be corrected (step S102). The interference evaluation device 1a sets the position of the interfering station 210 on the map as an interference evaluation condition. The interference evaluation device 1a displays a symbol (triangle) representing the interfering station 210 at the position of the interfering station 210 on the map. The interference evaluation device 1a may correct the position of the interfering station 210 on the map. The interference evaluation device 1a may add the positions of other interfering stations on the map (step S103).

[0041] FIG. 4 is a flowchart showing the details of the operation example of the interference evaluation device 1a in the first embodiment. That is, FIG. 4 is a flowchart of an operation for setting an evaluation range on the map and specifying, checking, and changing the positions of radio stations. The operation flow for specifying the evaluation range and the positions of radio stations on the map is composed of three steps. Namely, the steps are "setting the evaluation range on the map", "displaying the evaluation range on the map and checking the correction of the set evaluation range", and "setting, displaying, further correcting, and adding the positions of radio stations on the map".

[0042] In the first stage, "Setting the evaluation range on the map", the evaluation range is set from step S201 to step S205.

[0043] In the operation mode of specifying the evaluation range, specifying the evaluation range on the map is selected by the user. In the column for specifying the area on the screen for specifying the evaluation conditions for interference, for example, a "Map reading" button (not shown) is provided. By pressing this button, the evaluation range can be specified on the map (step S201).

[0044] The user aligns the pointer 201 with the position of the pointer 201-1 on the map illustrated in FIG. 2. The user clicks the left button of the operation unit 14 (mouse) (step S202). The position derivation unit 101 numerically converts the coordinates specified on the map into latitude and longitude. The latitude and longitude are associated with the position of the upper left corner of the evaluation range 200 (first range).

[0045] In step S202, the coordinates corresponding to the position of the pointer 201-1 on the map are numerically converted into latitude and longitude. The numerical values of the latitude and longitude are input, for example, into the area designation setting column 410 in FIG. 28 in the columns for the latitude and longitude of the upper left coordinates of the evaluation range (step S203).

[0046] The user aligns the pointer 201 with the position of the pointer 201-2 on the map illustrated in FIG. 2. The user clicks the left button of the operation unit 14 (mouse). The latitude and longitude are associated with the position of the lower right corner of the evaluation range 200. (Step S204).

[0047] The position derivation unit 101 numerically converts the position of the pointer 201-2 on the map into latitude and longitude. Based on the latitude and longitude, the position derivation unit 101 sets the lower right corner of the evaluation range. The numerical values of the latitude and longitude are input, for example, into the area designation setting column 410 in FIG. 28 in the columns for the latitude and longitude of the lower right coordinates of the evaluation range (step S205).

[0048] In the second stage, "Display of the evaluation range on the map and correction and confirmation of the set evaluation range", for the evaluation range set in the first stage, from step S206 to step S209, the evaluation range is displayed. As a result, whether correction is necessary is confirmed by the user.

[0049] The image processing unit 103a displays the evaluation range 200 set on the map on the display unit 15. The evaluation range 200 is displayed, for example, as a rectangle surrounded by a dotted line. By providing an upside-down L shape at the upper left corner of the evaluation range 200 and a right-side-up L shape at the lower right corner of the evaluation range 200, the set evaluation range 200 is more clearly recognized by the user (step S206).

[0050] If the evaluation range 200 displayed on the map is different from the range desired by the user due to a setting error by the user or the like, it is conceivable that the user will re-set. Therefore, the evaluation range derivation unit 100 confirms with the user whether to clear the display of the set evaluation range 200 or the like (step S207).

[0051] When clearing the display of the set evaluation range 200 or the like (step S207: YES), the evaluation range derivation unit 100 erases the display of the evaluation range 200 set in the evaluation range (step S208). The interference evaluation device 1a returns the process to step S201. When not clearing the display of the set evaluation range 200 or the like (step S207: NO), the evaluation range derivation unit 100 confirms with the user whether to correct the already set evaluation range (step S209).

[0052] If there is no need to correct the already set evaluation range (step S209: NO), the interference evaluation device 1a proceeds to step S210 in the third stage.

[0053] In the third stage, "Setting and display of the positions of wireless stations on the map and correction and addition of the positions of wireless stations", while the user checks the evaluation range on the map, the user sets the positions of the wireless stations. The user may correct the position of the evaluation range. The user may add another wireless station to the map.

[0054] In the third stage, in the designated mode of the wireless station, the user designates (selects) on the map the wireless stations to be executed from step S210 to step S216. On the station DB (station database) editing screen displayed on the display unit 15, a "read map" button is provided, for example, in the parts of the latitude, longitude, and altitude for setting the position of the wireless station. The user designates the wireless station on the map by pressing this button (step S210).

[0055] The user aligns the pointer 201 with the position of the pointer 201-3 on the map and clicks the left button of the operation unit 14 (mouse). The position derivation unit 101 acquires the position information (coordinates) of the pointer 201-3 on the map as the installation position of the interfering station 210 (step S211).

[0056] The position derivation unit 101 numerically converts the position information (coordinates) of the pointer 201-3 on the map into latitude and longitude in the real space. The position derivation unit 101 sets the latitude and longitude as the position where the interfering station 210 (wireless station) is to be installed. The position derivation unit 101 records the latitude and longitude associated with the interfering station 210 in the storage device 12. The position derivation unit 101 inputs the latitude and longitude of the interfering station 210 into the latitude and longitude columns of the screen for setting the position of the wireless station. In this way, the map is used to set the position where the wireless station is to be installed (step S212).

[0057] The image processing unit 103a displays the position of the set wireless station on the map displayed on the display unit 15. Here, the image processing unit 103a displays the position of the wireless station set in steps S211 and S212 on the map. For example, in FIG. 2, the position of the wireless station is represented by the position of the triangle at the position of the interference station 210. In FIG. 2, the color of the hatched triangle is, for example, red on the screen of the display unit 15. Also, in FIG. 2, the contour of the evaluation range 200 represented by the black dotted line is represented by, for example, a red dotted line on the screen of the display unit 15. Thus, it is easy for the user to understand that the position of the interference station 210 (wireless station) is set within the evaluation range 200 (step S213).

[0058] The position derivation unit 101 confirms with the user whether to correct the position of the set wireless station. The user visually recognizes the display of the wireless station shown on the map and answers whether to correct its position using the operation unit 14 (step S214). When correcting the position of the set wireless station (step S214: YES), the position derivation unit 101 returns the process to step S211. When not correcting the position of the set wireless station (step S214: NO), the position derivation unit 101 proceeds to step S215.

[0059] The user is confirmed whether to add the positions of other wireless stations as evaluation targets (step S215). When adding the positions of other wireless stations as evaluation targets (step S215: YES), the position derivation unit 101 returns the process to step S210. When not adding the positions of other wireless stations as evaluation targets (step S215: NO), the position derivation unit 101 proceeds to step S216.

[0060] The evaluation range derivation unit 100 confirms with the user whether to correct the set evaluation range. That is, at the stage when the position of the wireless station has already been set, the evaluation range derivation unit 100 confirms with the user whether it is possible to perform interference evaluation on the already set evaluation range (step S216). When correcting the set evaluation range (step S216: YES), the evaluation range derivation unit 100 ends the process.

[0061] When the set evaluation range is to be corrected (step S216: YES), the evaluation range derivation unit 100 may proceed to a connector "A" shown in Fig. 13 described later. When the set evaluation range is not to be corrected (step S216: NO), the evaluation range derivation unit 100 may proceed to a connector "B" shown in Fig. 19 described later.

[0062] As described above, the position derivation unit 101 derives the coordinates of the evaluation range in the real space based on the first range specified using the map, and derives the coordinates of the wireless station in the real space based on the position specified using the map. The interference derivation unit 102a derives the interference level of the radio wave transmitted from the wireless station for the evaluation range based on the coordinates of the evaluation range and the coordinates of the wireless station. The image processing unit 103a displays an image according to the interference level on the display unit.

[0063] This can reduce the effort required to specify evaluation conditions for radio interference.

[0064] To more simply and reliably set an evaluation range and the positions of wireless stations when evaluating the influence of interference from wireless stations using interference evaluation software.

[0065] When evaluating the influence of interference from wireless stations, interference evaluation support is provided by applying the above-described embodiment 1. ? By using this tool, the evaluation range and the location of wireless stations can be set simply and reliably. In particular, since interference adjustment requires multiple evaluations and examinations, the time and effort required for the above-mentioned settings can be significantly reduced.

[0066] The user can easily specify, confirm, and change the evaluation range and the position of the wireless station on the map. Therefore, the user can intuitively and simply understand the relationship between the evaluation range and the position of the wireless station. As a result, more appropriate interference evaluation can be implemented. In most cases of interference coordination, it is necessary to carry out interference evaluation multiple times, but the amount of work required can be significantly reduced.

[0067] Second embodiment In the second embodiment, the difference from the first embodiment is that a three-dimensional path is defined in a three-dimensional evaluation range (second range) within the evaluation range 200 (first range). In the second embodiment, the description will focus on the differences from the first embodiment.

[0068] As one of the use cases of a mobile communication system in the advancing introduction of Local 5G (Local 5th Generation), there is communication with an aircraft. A radio station installed on an aircraft that receives radio waves from an interference source (interfering station) may become an interference point. In such a use case, since the interference source or interference point exists three-dimensionally, it is more difficult to predict interference compared to the case where the interference source or interference point exists two-dimensionally. Also, it is more difficult to display cells and service areas compared to the case where the interference source or interference point exists two-dimensionally.

[0069] That is, in addition to wireless communication devices installed at fixed positions or wireless terminals carried and moved, the utilization of wireless communication is diversifying. For example, unmanned aircraft (aircraft) such as drones (UAV: unmanned aerial vehicle) may be equipped with radio stations. In this case, if the display result of interference evaluation is simply shown on a two-dimensional map, it becomes difficult to fully consider interference countermeasures shared among different wireless systems.

[0070] In FIGS. 25, 26, and 27, the difference in the radio wave level arriving from the interfering station is represented by color-coding (enclosing with different types of lines, different types of hatching) of regions on a two-dimensional (plane) map. This makes it easier for the user to understand the result of interference evaluation.

[0071] These result displays shown on the two-dimensional map are useful for each interference adjustment for a fixed-position radio base station, a vehicle traveling on a road, and a wireless terminal (a terminal that moves in two dimensions) carried by a person walking on the ground. However, they may not be useful for interference adjustment for wireless communication of a flying object (such as a drone or an unmanned aerial vehicle (rover)) that moves in three dimensions.

[0072] Thus, these result displays shown on the two-dimensional map are insufficient for confirming the evaluation results of the radio wave level at a predetermined height (above a building or at an altitude exceeding the mountain forest in a mountainous area). That is, since the interference evaluation results displayed on the map are the results of planar interference evaluation, the interference situation that changes according to the flight altitude of the drone is not represented in the interference evaluation results displayed on the map. For this reason, the user cannot appropriately grasp the interference evaluation of the drone.

[0073] After the derivation conditions of the above-described interference evaluation are set, the evaluation results are displayed by executing the following three steps. As a result, the sophistication and expansion of the display of the interference evaluation results are realized.

[0074] In the first step, a three-dimensional evaluation range is set for the object to fly (flying object). The evaluation range is divided into a plurality of reference rectangular parallelepipeds, and interference calculations are performed at the representative points (the central points of each rectangular parallelepiped) of all the rectangular parallelepipeds.

[0075] In the second step, a three-dimensional flight path (wire-like flight path) of the object to fly is set. Also, the position information of a plurality of points passing through the flight path designated by the user using the map is converted into numerical values of latitude and longitude. The user inputs the height of each point passing through the flight path into the interference evaluation device using the map. In the third step, the results of the interference evaluation on the vertical cross-section of the set flight path are displayed.

[0076] FIG. 5 is a diagram showing a configuration example of the interference evaluation apparatus 1b in the second embodiment. The interference evaluation apparatus 1b is an information processing apparatus that evaluates radio wave interference. The interference evaluation apparatus 1b includes a control unit 10b, a memory 11, a storage device 12, a communication unit 13, an operation unit 14, and a display unit 15. The control unit 10b includes an evaluation range derivation unit 100, a position derivation unit 101, an interference derivation unit 102b, an image processing unit 103b, a route range derivation unit 104, and a three-dimensional route derivation unit 105.

[0077] The route range derivation unit 104 derives a route range (a three-dimensional evaluation range), which is a range in which the three-dimensional route is set, according to an operation by the user. The three-dimensional route derivation unit 105 derives a three-dimensional flight route (a wire-like flight route) of an object to fly (an interference point) according to an operation by the user. The three-dimensional route derivation unit 105 converts the position specified on the map as the position of the three-dimensional route into latitude and longitude. The three-dimensional route derivation unit 105 converts the specified rotation amount as the position of the three-dimensional route into altitude. The three-dimensional route derivation unit 105 may convert the position specified on the graph as the position of the three-dimensional route into altitude. The numerical values thus converted are used for interference evaluation as the position of the three-dimensional route.

[0078] FIG. 6 is a diagram showing an example of a designation screen of an evaluation range (a first range) and a route range (a second range) in the second embodiment. An evaluation range 200 is set on the map at the same location (range) as the example in FIG. 2. By a user operation similar to the user operation for setting the evaluation range 200 on the map, the evaluation range derivation unit 100 sets a route range 220 in the evaluation range 200.

[0079] FIG. 7 is a diagram showing an example of interference evaluation of a two-dimensional path range (planar evaluation range) in the second embodiment. Considering latitude and longitude, a two-dimensional evaluation range is defined. The path range 220 includes a path on the ground determined by the projection of the three-dimensional path range of the object to fly (interference point). The ground surface of the path range 220 is composed of sub-spaces 202 (rectangles) partitioned in the longitude direction and the latitude direction, respectively. The interference derivation unit 102b derives the evaluation result of the interference evaluation on the ground surface of the path range 220 between the interfering station 210 and each representative point 203 (center point of the rectangle). Note that the interference derivation unit 102b may similarly derive the evaluation result of the interference evaluation on the ground surface for the planar evaluation range 200 as well.

[0080] FIG. 8 is a diagram showing an example of interference evaluation of a three-dimensional path range (three-dimensional evaluation range) in the second embodiment. Considering latitude, longitude, and altitude, a three-dimensional path range is defined. The path range 220 includes the three-dimensional flight path of the object to fly (interference point). The path range 220 is composed of sub-spaces 221 (cuboids) partitioned in the longitude direction, the latitude direction, and the altitude direction, respectively. The interference derivation unit 102b derives the evaluation result of the interference evaluation between the interfering station 210 and each representative point 222 (center point of the cuboid).

[0081] FIG. 9 is a diagram showing an example of an antenna pattern in the second embodiment. In the interference evaluation between the interfering station 210 and the representative point 222, the three-dimensional antenna pattern of the interfering station 210 is considered.

[0082] The upper right graph in FIG. 9 represents the antenna pattern of the vertical cross-section (V-plane). The lower right graph represents the antenna pattern of the horizontal cross-section (H-plane). The left graph represents the combination of the antenna pattern of the vertical cross-section (V-plane) and the antenna pattern of the horizontal cross-section (H-plane). The representative point direction vector 223 represents the direction vector from the interfering station 210 to the representative point 222. The vector size of the representative point direction vector 223 represents the gain. When the representative point direction vector 223 faces the front direction (peak direction) of the interfering station 210, the vector size of the representative point direction vector 223 represents the maximum gain. The interference evaluation is performed in consideration of the reduction of the interference level using the representative point direction vector 223.

[0083] FIG. 10 is a diagram showing an example of terrain data in the second embodiment. Three-dimensional terrain data may be considered in the interference evaluation. The storage device 12 stores in advance the vertical cross-section data of the terrain between the interfering station 210 and the interfered station (representative point 222). In FIG. 10, depending on the position of the representative point 222, there are cases where there is a line of sight for radio waves (representative points 222-2, 222-3) and cases where there is no line of sight for radio waves (representative point 222-1). When there is no line of sight, the interference evaluation is performed taking into account the loss due to the terrain (ridge 300) that blocks the view.

[0084] In the interference evaluation in wireless communication, when wireless stations with fixed positions target a low-frequency (< several GHz) wireless system, the accuracy of the interference evaluation is increased to a certain extent by considering the antenna pattern of the interfering station 210 and the terrain data.

[0085] However, there may be cases where a company or local government constructs its own 5G network that can be used within a limited range (e.g., within its own building, within its own land) without relying on local 5G communication carriers. In this case, in the interference evaluation of wireless communication, it is necessary to consider higher frequencies (≧ several GHz). Therefore, the position data and shape data of artificial objects such as buildings may be further considered in the interference evaluation.

[0086] For example, interference evaluation in Japan may be performed using topographic data provided by the Geospatial Information Authority of Japan and a 3D map (digital map including building height and building shape information) provided by a map vendor. Interference evaluation may be performed considering the building situation existing between the representative point 222 of the subspace 221 that divides the evaluation range 200 where the installation of the victim station is assumed and the position of the interfering station 210. Thereby, for high-frequency wireless communication as well, an evaluation result with necessary accuracy can be obtained.

[0087] FIG. 11 is a diagram showing an example of setting a wire-shaped 3D route in the second embodiment. FIG. 11 shows an enlarged map of a part of the map (range including the 3D route) exemplified in FIG. 2. Also, the interference level for each vertical cross-section that divides the 3D route is expressed along the route projected on the map (route on the map).

[0088] Regarding the height (altitude) of the flight route of a flying object such as a drone, the highest point of the altitude at which the drone flies and the step width (for example, unit height) from the ground to the highest point are separately specified. For each representative point of the subspace constituting the specified evaluation range, an evaluation result of interference such as the radio wave reception level is derived.

[0089] If the evaluation results are displayed on a flat map, the impact of interference in a flying object such as a drone becomes unclear. Therefore, the user sets the flight path of the drone using a flat map and a vertical graph. In setting the wire-shaped three-dimensional path, similar to the operation when setting the evaluation range 200 and the position of the interfering station 210, the user moves the pointer 201 of the operation unit 14 (mouse) on the map or graph. By doing so, the user operates the operation unit 14 to specify a plurality of three-dimensional path passing points so as to connect from the starting point 230-1 to the arrival point 238-1. The plurality of three-dimensional path passing points are, for example, each point from the three-dimensional path passing point 231-1 to the three-dimensional path passing point 237-1. In FIG. 11, the drawing of other three-dimensional path passing points on the three-dimensional path is omitted. The altitude (height above the ground) of each three-dimensional path passing point is input additionally by the user. The flight path is expressed as a polyline connecting the contact points between the three-dimensional path passing points. The position where the line bends in the polyline is the position of the three-dimensional path passing point (designated point).

[0090] For example, when the user designates a position on a flat map using the pointer 201, the latitude and longitude corresponding to the position of the three-dimensional path passing point are derived. Regarding the position of the pointer 201, the altitude of the three-dimensional path passing point is input to the three-dimensional path derivation unit 105 according to the rotation amount (number of rotations, angle) of the wheel switch of the operation unit 14 (mouse).

[0091] Using the pointer 201 moving on the map, the user inputs the latitude and longitude to the position derivation unit 101. If the user repeats the input of the altitude of the three-dimensional path passing point in order by operating the wheel of the operation unit 14 (mouse), the three-dimensional path of the drone can be quickly and easily set in the interference evaluation device.

[0092] In the "vertical cross-section along the path" illustrated in FIG. 11, the horizontal axis represents the path on the map, and the vertical axis represents the flight altitude. The "vertical cross-section along the path" displays the vertical cross-section of a three-dimensional flight path (wire-shaped flight path) along the path. The rotation amount (number of rotations, angle) of the wheel switch of the operation unit 14 (mouse) is input and set in the database as the altitude value at each specified point (three-dimensional path passing point). The user can easily input and set the position (latitude and longitude) and altitude of the specified points on the flight path.

[0093] On the horizontal axis representing the flight path from the departure point 230-2 to the arrival point 238-2, the path that bends along the map is stretched straight. Therefore, the horizontal axis of the "vertical cross-section along the path" represents the horizontal flight distance from the departure point in a flying object such as a drone. Also, the horizontal flight distance from the departure point to the arrival point in the flying object represents the total flight distance of the flying object. The vertical axis represents the altitude (height) of the wire-shaped three-dimensional path, that is, the vertical axis indicates the height of the flight path.

[0094] FIG. 12 is a diagram showing an example of a screen of the interference evaluation result in the second embodiment. FIG. 12 shows an enlarged map of a part of the map (the range including the three-dimensional path) illustrated in FIG. 2. Also, the interference level for each vertical cross-section separating the three-dimensional path is represented along the path projected on the map (the path on the map). In the "vertical cross-section along the path", the interference level is indicated for each arrow using the color of each arrow that sequentially connects the departure point 230 to the arrival point 238 of the three-dimensional path (the path of the flying object). Here, although it is distinguished by color on the screen of the display unit 15, it is distinguished by shading in FIG. 12. For example, in the path section (vertical cross-section section) where a red arrow (a black arrow in FIG. 12) is shown on the screen of the display unit 15, the interference level is the highest. On the screen of the display unit 15, the interference level decreases in the order of red, orange, yellow, yellow-green, light blue, and dark blue (in FIG. 12, in the order from black through dark gray to light gray).

[0095] As illustrated in FIG. 12, the interference level changes according to the latitude, longitude, and altitude of the three-dimensional path from the starting point 230 to the arrival point 238. By using the interference level display with arrows on the map, the user can readily grasp the interference level at each three-dimensional path passing point that constitutes the three-dimensional path of the aircraft. For example, in the three-dimensional path of the aircraft, as the aircraft approaches the arrival point 238, the interference level at the aircraft (the interfered station) increases. This is because the interfering station 210 is arranged at a position ahead of the arrival point 238 of the three-dimensional path of the aircraft.

[0096] In the result of the interference evaluation, it is assumed that the interference level varies according to the altitude of the flight path. As illustrated in FIG. 6, the position of the interfering station 210 is at an azimuth where the flight path is further extended from the arrival point 238. For this reason, it is expected that, throughout the flight path, the closer a three-dimensional path passing point is to the arrival point 238 among the plurality of three-dimensional path passing points, the higher the interference level will be.

[0097] There are a first obstacle (bridge) and a second obstacle (bridge) in the middle of the three-dimensional path. The aircraft (not shown) flies over the first obstacle 301 (bridge) and the second obstacle 302 (bridge). The difference in the color of the arrows indicates that the interference level varies according to the altitude for the evaluation result of each vertical cross-section along the three-dimensional path (flight path). The aircraft moves from the starting point 230 along the three-dimensional path at a normal predetermined altitude. Before reaching the arrival point 238, the aircraft increases its altitude above the normal predetermined altitude to avoid the first obstacle 301 and the second obstacle 302.

[0098] Since the altitude of the three-dimensional path is high above the first obstacle (bridge) and the second obstacle (bridge), the interference level is higher compared to other sections of the three-dimensional path. In this way, by checking the interference level shown in the vertical cross-section along the path, the user can easily grasp the interference level.

[0099] Next, an operation example of the interference evaluation device 1b will be described. FIG. 13 is a flowchart showing an operation example of the interference evaluation apparatus 1b in the second embodiment. Following step S103 in FIG. 3, by a user operation similar to the user operation for setting the evaluation range 200 on the map, the evaluation range derivation unit 100 sets the path range 220 in the evaluation range 200. The interference derivation unit 102b derives the interference level for the representative point 222 of the subspace 221 constituting the path range 220 set using the map. The interference derivation unit 102b may derive the interference level for the representative point 203 of the subspace 202 constituting the path range 220 set using the map (step S104).

[0100] It is necessary to perform interference evaluation on the three-dimensional path that a flying object (such as a drone) that can become the interfered station flies. For this reason, the three-dimensional path to be the object of interference evaluation is set (step S105). The display unit 15 displays the result of the interference evaluation for each vertical cross-section that divides the set three-dimensional path (step S106).

[0101] FIG. 14 is a flowchart showing details of an operation example of the interference evaluation apparatus 1b in the second embodiment. The flowchart in FIG. 14 has three stages. In the first stage, the setting of the path range 220 (three-dimensional evaluation range) and the derivation of the interference level at the representative points of all subspaces are executed. In the second stage, the three-dimensional path to be the object of interference evaluation is set. In the third stage, the result of the interference evaluation is displayed for each vertical cross-section that divides the set three-dimensional path.

[0102] In the first stage, following step S103 in FIG. 3, using the map, the path range 220 (three-dimensional evaluation range) is newly set. When a planar map is used, as described in the first embodiment, the latitude and longitude corresponding to the upper left corner of the path range 220 are set. The latitude and longitude corresponding to the lower right corner of the path range 220 are set. Also, according to the highest point of the three-dimensional path of the flying object, the path range 220 (three-dimensional evaluation range) is set (step S301).

[0103] The path range derivation unit 104 divides the specified path range 220 into child spaces (rectangular parallelepipeds). The size of the child space 202 on the horizontal plane may be determined in advance based on the size (latitude and longitude) of the path range 220 (three-dimensional evaluation range) and a reference size (for example, in units of 200 m, 50 m, or 10 m). The path range 220 may be divided, for example, into "100×100" numbers of child spaces 202 (meshes).

[0104] The height direction of the path range 220 may be divided into child spaces 221 by dividing the space between the highest point of the three-dimensional path (for example, 300 m, 150 m, 50 m, etc. in height) and 0 m above the ground by a predetermined altitude width (for example, 10 m, 5 m, 2 m). The space between the highest point and the ground may be divided by a predetermined number of height intervals (for example, 30, 10, 5, etc.). In this way, the three-dimensional path range 220 is divided into child spaces 202 in three-axis directions (step S302).

[0105] The interference derivation unit 102b determines whether interference has been derived for the representative points 222 of all the child spaces 221 of the path range 220. The representative point 222 is, for example, the central point of the child space 221 (rectangular parallelepiped) (step S303). When interference has been derived for the representative points 222 of all the child spaces 221 of the path range 220 (step S303: YES), the interference derivation unit 102b proceeds to step S305. When interference has not been derived for the representative points 222 of any of the child spaces 221 of the path range 220 (step S303: NO), the interference derivation unit 102b proceeds to step S304.

[0106] The interference derivation unit 102b derives an interference level for each representative point 222. In deriving the interference level, the distance between the interfering station 210 and the representative point 222 is considered. In addition, high portions existing in the terrain between the interfering station 210 and the representative point 222 are considered as ridges 300 (step S304).

[0107] In the second stage, the interference derivation unit 102b determines whether a three-dimensional path has been set from the starting point 230 to the arrival point 238 (step S305). If the three-dimensional path has been set from the starting point 230 to the arrival point 238 (step S305: YES), the interference derivation unit 102b proceeds to step S308. If the three-dimensional path has been set only up to the middle between the starting point 230 and the arrival point 238 (step S305: NO), the interference derivation unit 102b proceeds to step S306.

[0108] A user sets a three-dimensional path of an aircraft equipped with a wireless station for wireless communication using a map. The user determines the positions (latitude and longitude) of the three-dimensional path passing points (points) on the map in order from the starting point 230. The three-dimensional path derivation unit 105 connects the previous three-dimensional path passing point set and the current three-dimensional path passing point set with a straight line segment (arrow). In setting the three-dimensional path passing points, the operation unit 14 (mouse) may be utilized in the same manner as the operation method described in the first embodiment (step S306).

[0109] The three-dimensional path derivation unit 105 determines the altitude of each three-dimensional path passing point of the three-dimensional path according to the operation by the user. Here, the three-dimensional path derivation unit 105 determines the ground height of the three-dimensional path passing point set in the immediately preceding step S306 (step S307). When the setting of the altitude is completed, the three-dimensional path derivation unit 105 returns the process to step S305.

[0110] In the third stage, the image processing unit 103b determines whether the display of the interference level has been completed for all three-dimensional path passing points (vertical cross-sections) from the starting point 230 to the arrival point 238 of the three-dimensional path (step S308). If the display of the interference level has been completed for all three-dimensional path passing points (step S308: YES), the image processing unit 103b proceeds to step S310. If the display of the interference level has not been completed for any of the three-dimensional path passing points (step S308: NO), the image processing unit 103b displays a colored arrow according to the result of the interference evaluation on the display unit 15 for each vertical cross-section that divides the three-dimensional path (step S309). After the colored arrow is displayed, the image processing unit 103b returns the process to step S308 again.

[0111] The image processing unit 103b confirms with the user whether to re-set the three-dimensional path (step S310). If it is necessary to re-set the three-dimensional path (step S310: YES), the image processing unit 103b returns the process to step S305. If it is not necessary to re-set the three-dimensional path (step S310: NO), the interference evaluation device 1b ends the process of the flowchart illustrated in FIG. 14.

[0112] As described above, the path range derivation unit 104 derives the coordinates of the path range 220 that can include the three-dimensional path in the real space based on the path range 220 (second range) specified within the evaluation range 200 (first range) using the map. The three-dimensional path derivation unit 105 derives the coordinates of the three-dimensional path (the coordinates of the starting point 230, the coordinates of each three-dimensional path passing point, and the coordinates of the arrival point 238) based on the path specified using the map (the path from the starting point 230 to the arrival point 238). The interference derivation unit 102b derives the interference level for the path range 220. The image processing unit 103b displays an image according to the interference level in the three-dimensional path on the display unit 15.

[0113] As a result, a three-dimensional interference power heat map is visualized, so that it is possible to reduce the labor of the operation for specifying the evaluation conditions of radio wave interference and provide the user with the result of the interference evaluation in a more understandable manner.

[0114] For a wireless station with an unfixed installation position and a portable wireless station such as a mobile terminal, by applying a vertical cross-section along the flight path of the unmanned aerial vehicle, the user can more easily grasp the result of the interference evaluation in the wireless station mounted on the unmanned aerial vehicle in the sky. In addition, a support tool can be provided to the user to facilitate the user's selection of a three-dimensional path for reducing or mitigating the influence of interference in the flying object.

[0115] (Modification of the Second Embodiment) In the modification of the second embodiment, the difference from the second embodiment is that the interference level is displayed as an aerial view using a plurality of colored arrows along a wire-shaped three-dimensional path. In the modification of the second embodiment, the description will be centered on the difference from the second embodiment.

[0116] In the second embodiment, for a three-dimensional path that is bent in the horizontal plane when projected onto the horizontal plane (ground), the three-dimensional path from the starting point 230 to the arrival point 238 is stretched into a straight line, and the vertical cross-section of the three-dimensional path is displayed as in the "vertical cross-section along the path" illustrated in FIG. 12. The three-dimensional path may be displayed in a bent wire shape using a three-dimensional map (aerial view). Colored arrows corresponding to the interference level may be assigned to the bent wire-shaped three-dimensional path for each vertical cross-section that divides the three-dimensional path.

[0117] FIG. 15 is a diagram showing an example of a screen (aerial map) of the interference evaluation result in the modification of the second embodiment. In FIG. 15, the interference level is displayed as an aerial view using a plurality of colored arrows along a wire-shaped three-dimensional path. The interference level for each vertical cross-section along the three-dimensional path and the aerial view are, for example, displayed on the same screen. In the aerial view, the state in which the interference level changes according to the latitude, longitude, and altitude is depicted using colored arrows. Thereby, the user can easily grasp which part of the three-dimensional path has a high or low interference level.

[0118] In addition, the degree of coloring of the two-dimensional map corresponding to the background (underlay) of the bird's-eye view may be suppressed to a predetermined level so that the path on the ground, the three-dimensional path, and the colored arrow are more visible. The viewpoint may be rotated using each direction axis (x-axis, y-axis, z-axis) of latitude, longitude, and altitude. In particular, in a complex case (for example, a case where three-dimensional paths intersect), the three-dimensional path may be rotated according to the rotation of the three-dimensional map. That is, the viewpoint to the three-dimensional path may be considered to have degrees of freedom in the three-dimensional direction.

[0119] As described above, the interference level is displayed as a bird's-eye view using a plurality of colored arrows along the wire-like three-dimensional path. This can reduce the labor of the operation for specifying the evaluation conditions of wave interference, and it is possible to more easily understand the evaluation result of interference by means of a three-dimensional image (three-dimensional map) (three-dimensional bird's-eye view) including the three-dimensional path.

[0120] (Third Embodiment) In the third embodiment, the difference from the first embodiment is that in the three-dimensionally displayed path range (three-dimensional evaluation range), the interference region where the interference level is equal to or higher than the threshold value is colored. In the third embodiment, the description will be centered on the difference from the first embodiment.

[0121] In some cases, it may be difficult to change the three-dimensional path (flight path) of the flying object moving in the horizontal and vertical directions to a path with less interference. In the second embodiment, the result of the interference evaluation is displayed from the viewpoint that the user can confirm in detail the degree of the interference level in the predetermined three-dimensional path.

[0122] On the other hand, in the third embodiment, the display of the result of the interference evaluation is three-dimensional. That is, the interference region by the interfering station is displayed as a three-dimensional image. Since the interference region is displayed as a three-dimensional image (three-dimensional interference level distribution map), the user can easily change the three-dimensional path so that the three-dimensional path does not pass through the interference region.

[0123] After the interference evaluation conditions are set, the results of the interference region (interference evaluation) by the interfering station for the three-dimensional path are displayed according to the following four steps.

[0124] In the first step, a three-dimensional path range 220 is determined for the flying object. The path range 220 is delimited by a reference subspace (rectangular parallelepiped). Interference is derived for the representative points (the central points of each rectangular parallelepiped) of all subspaces.

[0125] In the second step, the user operates the operation unit 14 to specify a plurality of three-dimensional path passing points so as to connect from the starting point 230 to the arrival point 238. The three-dimensional path derivation unit 105 derives a three-dimensional flight path (wire-shaped flight path) of the object to be flown (interference point) according to the operation by the user. The three-dimensional path derivation unit 105 converts the position specified on the map as the position of the three-dimensional path into latitude and longitude. The three-dimensional path derivation unit 105 converts the specified rotation amount as the position of the three-dimensional path into altitude. The three-dimensional path derivation unit 105 may convert the position specified on the graph as the position of the three-dimensional path into altitude. The numerical values thus converted are used for interference evaluation as the position of the three-dimensional path. Also, the results of the interference evaluation (interference region) are displayed in a three-dimensional and easy-to-understand manner.

[0126] In the third step, for each three-dimensional path passing point of the three-dimensional path displayed three-dimensionally, a colored arrow is displayed in a color according to the result of the interference evaluation (interference level).

[0127] In the fourth step, the user may specify a threshold value of the interference level in the interference region using the operation unit 14. The image processing unit colors the interference region where the interference level is equal to or higher than the threshold value in the three-dimensionally displayed path range 220 (three-dimensional evaluation range). The image processing unit makes the interference region where the interference level is equal to or higher than the threshold value transparent in the three-dimensionally displayed path range 220.

[0128] FIG. 16 is a diagram showing a configuration example of the interference evaluation apparatus 1c in the third embodiment. The interference evaluation apparatus 1c is an information processing apparatus that evaluates radio wave interference. The interference evaluation apparatus 1c includes a control unit 10c, a memory 11, a storage device 12, a communication unit 13, an operation unit 14, and a display unit 15. The control unit 10c includes an evaluation range derivation unit 100, a position derivation unit 101, an interference derivation unit 102c, an image processing unit 103c, a path range derivation unit 104, and a three-dimensional path derivation unit 105.

[0129] FIG. 17 is a diagram showing a first example of a screen of the interference evaluation result of the three-dimensional path in the third embodiment. In FIG. 17, the image processing unit 103c three-dimensionally displays on the display unit 15 the interference region with the highest interference level and the three-dimensional path of the aircraft carrying the victim station. The image processing unit 103c three-dimensionally displays on the display unit 15, on the screen of the display unit 15, for example, a group of red rectangular parallelepipeds (a three-dimensional shape of a thick solid line in FIG. 17), the region where the influence of interference is equal to or greater than the threshold. The image processing unit 103c three-dimensionally displays on the display unit 15, for example, a group of transparent rectangular parallelepipeds, the region where the influence of interference is less than the threshold. Thereby, the user can easily confirm (grasp) the region where the influence of interference is equal to or greater than the threshold.

[0130] While viewing the three-dimensionally displayed interference region and three-dimensional path, the user changes the three-dimensional path so that the three-dimensional path does not pass through the region where the influence of interference is equal to or greater than the threshold. For example, based on the three-dimensionally displayed interference region and three-dimensional path, the user can easily determine that in order for the aircraft to avoid the second obstacle 302 and the interference region, the three-dimensional path may pass under the second obstacle 302.

[0131] FIG. 18 is a diagram showing a second example of a screen of the interference evaluation result of the three-dimensional path in the third embodiment. In FIG. 18, the image processing unit 103c three-dimensionally displays on the display unit 15 the interference region with the highest interference level, the interference region with a relatively high interference level (the interference region where the victim station may be affected by interference), and the three-dimensional path of the aircraft carrying the victim station.

[0132] The image processing unit 103c three-dimensionally displays the interference region with the highest interference level on the display unit 15 using, for example, a group of red rectangular parallelepipeds (a three-dimensional shape of thick solid lines in FIG. 18, similar to FIG. 17). The image processing unit 103c three-dimensionally displays the interference region with a relatively high interference level on the display unit 15 using, for example, a group of orange rectangular parallelepipeds (a three-dimensional shape of dotted lines in FIG. 18). The image processing unit 103c three-dimensionally displays the region where the influence of interference is less than the threshold on the display unit 15 using, for example, a group of transparent rectangular parallelepipeds. As a result, the user can easily confirm (grasp) not only the interference regions where the influence of interference is equal to or greater than the threshold but also the interference regions with a relatively high interference level.

[0133] Note that the image processing unit 103c may three-dimensionally display the interference region with the highest interference level and the interference region with a relatively high interference level on the display unit 15 using a group of transparent rectangular parallelepipeds. The image processing unit 103c may three-dimensionally display the region where the influence of interference is less than the threshold on the display unit 15 using a group of colored rectangular parallelepipeds. As a result, the user can easily confirm (grasp) that the three-dimensional path does not pass through the interference region by checking whether a part of the three-dimensional path appears to protrude from the transparent interference region.

[0134] Next, an operation example of the interference evaluation apparatus 1c will be described. FIG. 19 is a flowchart showing an operation example of the interference evaluation apparatus 1c in the third embodiment. Following step S103 in FIG. 3, the evaluation range derivation unit 100 sets the path range 220 in the evaluation range 200 by the same user operation as the user operation for setting the evaluation range 200 on the map. The interference derivation unit 102c derives the interference level for the representative point 222 of the subspace 221 constituting the path range 220 set using the map. The interference derivation unit 102c may also derive the interference level for the representative point 203 of the subspace 202 constituting the path range 220 set using the map (step S107).

[0135] It is necessary to perform interference evaluation on the three-dimensional path along which an aircraft (such as a drone) that can become an interfering object flies. For this purpose, a three-dimensional path to be the target of interference evaluation is set (step S108).

[0136] The display unit 15 displays the result of interference evaluation for each vertical cross-section that divides the set three-dimensional path (step S109). The image processing unit 103c three-dimensionally displays in the display unit 15, using a group of colored rectangular parallelepipeds, the region where the influence of interference is equal to or greater than the threshold value. The image processing unit 103c three-dimensionally displays in the display unit 15, using a group of transparent rectangular parallelepipeds, the region where the influence of interference is less than the threshold value (step S110).

[0137] FIG. 20 is a flowchart showing details of an operation example of the interference evaluation apparatus 1c in the third embodiment. The flowchart in FIG. 20 has four steps. In the first step, setting of the path range 220 (three-dimensional evaluation range) and derivation of the interference level at representative points of all child spaces are executed. In the second step, a three-dimensional path to be the target of interference evaluation is set. In the third step, the result of interference evaluation is three-dimensionally displayed for each vertical cross-section that divides the set three-dimensional path. In the fourth step, a threshold value of the interference level is specified. Also, the image processing unit 103c three-dimensionally displays in the display unit 15 the region where the influence of interference is equal to or greater than the threshold value and the region where the influence of interference is less than the threshold value. After the fourth step, a process of confirming with the user the necessity of changing the threshold value and changing the three-dimensional path may be executed.

[0138] Each process from step S401 to step S404 in the first step is the same as each process from step S301 to step S304 illustrated in FIG. 14. The process of step S405 in the second step is the same as the process of step S306 illustrated in FIG. 14. The process of step S406 in the second step is the same as the process of step S307 illustrated in FIG. 14. The process of step S407 in the second step is the same as the process of step S305 illustrated in FIG. 14.

[0139] In the third stage, the image processing unit 103c determines whether the display of all the three-dimensional path passing points between the starting point 230 and the arrival point 238 of the three-dimensional path has been completed (step S408). If the display of any of the three-dimensional path passing points has not been completed (step S408: NO), the image processing unit 103c displays a colored arrow corresponding to the interference evaluation result at each three-dimensional path passing point between the starting point 230 and the arrival point 238 of the three-dimensional path on the display unit 15 (step S409).

[0140] In the fourth stage, the image processing unit 103c acquires a threshold value for determining whether to color the interference evaluation result from the storage device 12 or the operation unit 14 (step S410). The image processing unit 103c colors or makes transparent the sub-space 221 (rectangular parallelepiped) according to the interference evaluation result at each representative point 222. Here, the image processing unit 103c colors the interference region where the interference level is equal to or higher than the threshold value in the three-dimensionally displayed path range 220 (three-dimensional evaluation range). The image processing unit 103c makes transparent the interference region where the interference level is less than the threshold value in the three-dimensionally displayed path range 220 (step S411).

[0141] The image processing unit 103c determines whether all the sub-spaces 221 or representative points 222 in the three-dimensionally displayed path range 220 have been colored or made transparent (step S412). If any of the sub-spaces 221 or representative points 222 in the path range 220 have not been colored or made transparent (step S412: NO), the image processing unit 103c returns the process to step S411.

[0142] When all the child spaces 221 or representative points 222 in the path range 220 are colored or made transparent (step S412: YES), the image processing unit 103c confirms with the user whether to change the threshold for interference evaluation in the display (step S413). When changing the threshold for interference evaluation (step S413: YES), the image processing unit 103c returns the process to step S410. When not changing the threshold for interference evaluation (step S413: NO), the image processing unit 103c confirms with the user whether to re-set the three-dimensional path (step S414). The process of step S414 is the same as the process of step S310 illustrated in FIG. 14.

[0143] As described above, the image processing unit 103c displays the interference area representing the distribution of the interference level on the display unit 15 as a three-dimensional image. Thereby, while reducing the labor of the operation for specifying the evaluation conditions of radio wave interference, it is possible to three-dimensionally display the result of the interference evaluation for the three-dimensional evaluation range so that the user can easily select a three-dimensional path in which an aircraft equipped with a radio station is less affected by interference.

[0144] In the interference evaluation for a fixed-position radio station and a portable radio station, the result of the interference evaluation may be shown on a two-dimensional map corresponding to the ground. On the other hand, in the interference evaluation for a radio station mounted on an unmanned aircraft (flying object) such as a drone, by three-dimensionally displaying the result of the interference evaluation for the three-dimensional evaluation range, it is possible for the user to easily select a three-dimensional path in which the aircraft is less affected by interference.

[0145] (Modification of the Third Embodiment) In the modification of the third embodiment, the difference from the third embodiment is that the point where the interfering station 210 is installed is inside the path range 220. In the modification of the third embodiment, the description will be centered on the difference from the third embodiment.

[0146] When the interference region is shown in a three-dimensional display as in the third embodiment, the interfering station 210 was installed outside the path range 220. Without changing the position of this interfering station 210 (transmitting station), the influence on interference in the flying object equipped with the interfered station was reduced. Also, the interfering station 210 is at a high position, and there may be a higher terrain (ridge 300) between the interfering station 210 and the path range 220.

[0147] On the other hand, in a modified example of the third embodiment, by changing the position of the interfering station 210 (transmitting station), the influence on interference in the flying object equipped with the interfered station is reduced.

[0148] FIG. 21 is a diagram showing an example of a screen of the interference evaluation result of a three-dimensional path in a modified example of the third embodiment. In FIG. 21, the interfering station 210 is arranged within the path range 220. The image processing unit 103c three-dimensionally displays, on the display unit 15, the interference region with the highest interference level within the path range 220 using, for example, a group of red rectangular parallelepipeds (a three-dimensional shape of thick solid lines in FIG. 21, similar to FIGS. 17 and 18). Also, the image processing unit 103c three-dimensionally displays, on the display unit 15, the interference region with a relatively high interference level within the path range 220 using, for example, a group of orange rectangular parallelepipeds (a three-dimensional shape of dotted lines in FIG. 21, similar to FIG. 18).

[0149] For each three-dimensional path passing point between the starting point 230 and the arrival point 238 of the three-dimensional path, the image processing unit 103c displays, on the display unit 15, a colored arrow (each arrow from a black arrow to a light gray arrow in FIG. 21) according to the interference evaluation result. In FIG. 21, as an example, an orange arrow (the second darkest arrow in FIG. 21) indicating a relatively high interference level exists in a part of the three-dimensional path. With such a display, the user can easily grasp that there are three-dimensional path passing points with a relatively high interference level in the three-dimensional path.

[0150] Also, in order to change the three-dimensional path so as to eliminate three-dimensional path passing points with a relatively high interference level, the user can easily understand that it is sufficient to change the altitude of the three-dimensional path passing points with a relatively high interference level to about 1.5 times.

[0151] As described above, the interfering station 210 may be arranged within the path range 220 which is a three-dimensional evaluation range. The image processing unit 103c three-dimensionally displays the interference region with the highest interference level within the path range 220 on the display unit 15 using, for example, a group of red rectangular parallelepipeds (the three-dimensional shape of thick solid lines in FIG. 21). Also, the image processing unit 103c three-dimensionally displays the interference region with a relatively high interference level within the path range 220 on the display unit 15 using, for example, a group of orange rectangular parallelepipeds (the three-dimensional shape of broken lines in FIG. 21).

[0152] As a result, while reducing the labor of the operation for specifying the radio wave interference evaluation conditions, it is possible to three-dimensionally display the result of the interference evaluation for the three-dimensional evaluation range so that the user can more easily select a three-dimensional path in which the flying object equipped with the radio station is less affected by interference.

[0153] (Fourth Embodiment) The processes from the first embodiment to the fourth embodiment may be executed continuously.

[0154] FIG. 22 is a flowchart showing a first example of the operation of the interference evaluation apparatus in the fourth embodiment. Each process from step S101 to step S103 shown in FIG. 22 is the same as each process from step S101 to step S103 shown in FIG. 3. Also, each process from step S104 to step S106 shown in FIG. 22 is the same as each process from step S104 to step S106 shown in FIG. 13.

[0155] FIG. 23 is a flowchart showing a second example of the operation of the interference evaluation apparatus in the fourth embodiment. Each process from step S101 to step S103 shown in FIG. 23 is the same as each process from step S101 to step S103 shown in FIG. 3. Also, each process from step S107 to step S110 shown in FIG. 23 is the same as each process from step S107 to step S110 shown in FIG. 19.

[0156] As described above, the processes from the first embodiment to the fourth embodiment may be executed continuously. As a result, while reducing the labor of the operation for specifying the evaluation conditions of radio interference, it is possible to three-dimensionally display the result of the interference evaluation for a three-dimensional evaluation range so that it is easier for the user to select a three-dimensional path in which the flying object equipped with the radio station is less affected by interference.

[0157] (Hardware Configuration Example) FIG. 24 is a diagram showing a hardware configuration example of the interference evaluation apparatus 1 in each embodiment. The interference evaluation apparatus 1 corresponds to the interference evaluation apparatus 1a of the first embodiment, the interference evaluation apparatus 1b of the second embodiment, and the interference evaluation apparatus 1c of the third embodiment, respectively.

[0158] Some or all of the functional units of the interference evaluation apparatus 1 are realized as software by a processor 16 such as a CPU (Central Processing Unit) executing programs stored in a storage device 12 having a non-volatile recording medium (non-temporary recording medium) and a memory 11. The program may be recorded on a computer-readable recording medium. A computer-readable recording medium is a non-temporary recording medium such as a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a portable medium such as a CD-ROM (Compact Disc Read Only Memory), and a storage device such as a hard disk and an SSD (Solid State Drive) built in a computer system.

[0159] Some or all of the functional parts of the interference evaluation apparatus 1 may be realized using hardware including an electronic circuit (electronic circuit or circuitry) using, for example, an LSI (Large Scale Integrated circuit), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array).

[0160] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and designs and the like within the scope not departing from the gist of the present invention are also included.

Industrial Applicability

[0161] The present invention is applicable to an information processing apparatus that evaluates radio wave interference such as wireless communication on a map in interference evaluation software.

Explanation of Reference Numerals

[0162] 1, 1a, 1b, 1c... interference evaluation apparatus, 10a, 10b, 10c... control unit, 11... memory, 12... storage device, 13... communication unit, 14... operation unit, 15... display unit, 16... processor, 100... evaluation range derivation unit, 101... position derivation unit, 102a, 102b, 102c... interference derivation unit, 103a, 103b, 103c... image processing unit, 104... path range derivation unit, 105... three-dimensional path derivation unit, 200... evaluation range, 201... pointer, 202... subspace, 203... representative point, 210... interfering station, 220... path range, 221... subspace, 222... representative point, 223... representative point direction vector, 230... starting point, 231... three-dimensional path passing point, 232... three-dimensional path passing point, 233... three-dimensional path passing point, 234... three-dimensional path passing point, 235... three-dimensional path passing point, 236... three-dimensional path passing point, 237... three-dimensional path passing point, 238... arrival point, 300... ridge, 301... first obstacle, 302... second obstacle, 400... interfering / affected information setting column, 410... area designation setting column, 420... interfering station antenna direction setting column, 430... wireless station position setting column

Claims

1. An interference evaluation method executed by an interference evaluation apparatus, comprising the steps of: deriving coordinates of an evaluation range in a real space based on a first range specified using a map, and deriving coordinates of a radio station in the real space based on a position specified using the map; deriving an interference level of radio waves transmitted from the radio station for the evaluation range based on the coordinates of the evaluation range and the coordinates of the radio station; displaying, on a display unit, an image corresponding to the interference level; deriving coordinates of a path range capable of including a three-dimensional path in the real space based on a second range specified within the first range using the map; deriving coordinates of the three-dimensional path based on a path specified using the map; and the step of deriving the interference level for the evaluation range includes deriving the interference level for the path range, and the step of displaying the image on the display unit includes displaying, on the display unit, an image corresponding to the interference level in the three-dimensional path. An interference evaluation method further comprising the above.

2. The step of displaying the image on the display unit includes displaying, on the display unit in a three-dimensional image, an interference region representing the distribution of the interference level. The interference evaluation method according to Claim 1, further comprising the above.

3. A position derivation unit that derives coordinates of an evaluation range in a real space based on a first range specified using a map, and derives coordinates of a radio station in the real space based on a position specified using the map; An interference derivation unit that derives an interference level of radio waves transmitted from the radio station for the evaluation range based on the coordinates of the evaluation range and the coordinates of the radio station; An image processing unit that displays, on a display unit, an image corresponding to the interference level; A route range derivation unit that derives coordinates of a route range capable of including a three-dimensional route in the real space based on a second range specified within the first range using the map; A three-dimensional route derivation unit that derives coordinates of the three-dimensional route based on a route specified using the map; comprising; The interference derivation unit derives the interference level for the route range; The image processing unit displays, on the display unit, an image corresponding to the interference level in the three-dimensional route; An interference evaluation device.

4. The image processing unit displays, on the display unit, an interference region representing the distribution of the interference level as a three-dimensional image; The interference evaluation device according to claim 3.

5. An interference evaluation program for causing a computer to function as the interference evaluation device according to claim 3 or claim 4.

Images