Field strength distribution calculation system, field strength distribution calculation method, and program

Abstract

To provide an electric field strength distribution calculation system, an electric field strength distribution calculation method, and a program capable of easily estimating electric field strength distribution in a space using a member that selectively transmits or blocks electromagnetic waves according to the frequency.SOLUTION: An electric field strength distribution calculation system includes an estimation unit that calculates an electric field strength distribution estimated in a virtual space corresponding to a target space on the basis of structure information on a structure that makes up the target space, electromagnetic characteristic information of the structure, and power supply equipment information on power supply equipment installed in the target space, and an output unit that outputs the calculation result calculated by the estimation unit. The structure includes an electromagnetic shielding member that selectively shields electromagnetic waves according to the frequency of the electromagnetic waves incident on the structure.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a field strength distribution calculation system, a field strength distribution calculation method, and a program. [Background technology]

[0002] There have been conventional techniques for estimating the electric field strength in space. For example, Patent Document 1 describes a technique for estimating propagation using the three-dimensional shapes of structures such as walls, floors, ceilings, windows, and partitions installed in a space, and the electrical properties (dielectric constant, magnetic permeability, conductivity, etc.) of the materials of the structures. Patent Document 1 also describes a technique for correcting the electrical properties of the materials of the structures so as to reduce the error between the estimated value and the measured value. There is also a wireless power supply technology that supplies (feeds) power wirelessly. In services that provide wireless power supply, in order to prevent the electromagnetic waves being supplied from interfering with other nearby radio wave services that use the same frequency, one possible operation is to surround the space where wireless power is supplied with components including FSS (Frequency Selective Surfaces) to prevent the electromagnetic waves supplied from the wireless power supply device from leaking outside the space. FSS is a component that selectively transmits or blocks electromagnetic waves depending on the frequency. By operating in this way, it becomes possible to operate the system without interfering with the electromagnetic waves supplied from the wireless power supply device and those used by other radio wave services. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6300485 Summary of the Invention [Problem to be solved by the invention]

[0004] As described above, materials such as FSS have the property of selectively blocking or passing electromagnetic waves of specific frequencies. Therefore, in a space surrounded by special materials such as FSS, the distribution of electric field strength in the space becomes more complex compared to a space not surrounded by FSS. Patent Document 1 does not anticipate the use of special materials such as FSS in structures. Therefore, even if the technology described in Patent Document 1 is used to estimate the electric field strength distribution in a space surrounded by special materials such as FSS, there is a possibility that the error between the estimated value and the measured value will be large. Therefore, there is a problem in that the electrical characteristics must be repeatedly corrected until the desired estimated value is obtained, which is time-consuming.

[0005] The present invention has been made in light of the above-mentioned problems, and aims to provide an electric field strength distribution calculation system, an electric field strength distribution calculation method, and a program that can easily estimate the distribution of electric field strength in a space that uses a member that selectively transmits or blocks electromagnetic waves depending on the frequency. [Means for solving the problem]

[0006] The electric field strength distribution calculation system of the present invention includes: a structure information acquisition unit that acquires structure information related to a structure that constitutes a target space, the structure information including information indicating a three-dimensional shape of the structure and information indicating an installation position of the structure in the target space; an electromagnetic characteristic information acquisition unit that acquires electromagnetic characteristic information indicating characteristics of electromagnetic waves incident on the structure; a power supply equipment information acquisition unit that acquires power supply equipment information related to power supply equipment to be installed in the target space, the power supply equipment information including information indicating an installation position of the power supply equipment in the target space and characteristics of the electromagnetic waves supplied by the power supply equipment; an estimation unit that calculates an electric field strength distribution estimated in a virtual space corresponding to the target space based on the structure information, the electromagnetic characteristic information, and the power supply equipment information; and an output unit that outputs the calculation result calculated by the estimation unit, wherein the structure includes an electromagnetic wave blocking member that selectively blocks electromagnetic waves incident on the structure in accordance with the frequency of the electromagnetic waves, and the electromagnetic wave blocking member is a member that reflects electromagnetic waves with different reflection intensities in accordance with a combination of the frequency and incident angle of the electromagnetic waves, The aforementioned The information indicates the reflection intensity according to the combination of frequency and incident angle of electromagnetic waves incident on the structure covered with an electromagnetic wave blocking material, and the estimation unit uses the electromagnetic characteristic information to calculate an estimated electric field intensity distribution in the virtual space by combining, for each area provided in the target space, the radio wave intensities of the direct waves arriving directly from the power supply equipment and the reflected waves arriving after the electromagnetic waves incident on the structure are reflected with a reflection intensity according to the combination of frequency and incident angle.

[0007] The electric field strength distribution calculation method of the present invention is a computer-implemented electric field strength distribution calculation method, in which a structure information acquisition unit acquires structure information regarding a structure constituting a target space, the structure information including information indicating a three-dimensional shape of the structure and information indicating an installation position of the structure in the target space, an electromagnetic characteristic information acquisition unit acquires electromagnetic characteristic information indicating characteristics of an electromagnetic wave incident on the structure, and a power supply equipment information acquisition unit acquires power supply equipment information regarding a power supply equipment to be installed in the target space, the power supply equipment information including an installation position of the power supply equipment in the target space and information indicating power supplied by the power supply equipment. power supply facility information including information indicating electromagnetic wave characteristics is acquired, an estimation unit calculates an estimated electric field intensity distribution in a virtual space corresponding to the target space based on the structure information, the electromagnetic characteristic information, and the power supply facility information, an output unit outputs the calculation result calculated by the estimation unit, the structure includes an electromagnetic wave blocking member that selectively blocks electromagnetic waves according to the frequency of the electromagnetic waves incident on the structure, the electromagnetic wave blocking member is a member that reflects electromagnetic waves with different reflection intensities according to a combination of the frequency and incident angle of the electromagnetic waves, and the electromagnetic characteristic information is The aforementioned The information indicates the reflection intensity according to the combination of frequency and incident angle of electromagnetic waves incident on the structure covered with an electromagnetic wave blocking material, and the estimation unit uses the electromagnetic characteristic information to calculate an estimated electric field intensity distribution in the virtual space by combining, for each area provided in the target space, the radio wave intensities of the direct waves arriving directly from the power supply equipment and the reflected waves arriving after the electromagnetic waves incident on the structure are reflected with a reflection intensity according to the combination of frequency and incident angle.

[0008] The program of the present invention is a program for causing a computer to operate as the electric field strength distribution calculation system described above, and is a program for causing the computer to function as each unit included in the electric field strength distribution calculation system. [Effects of the Invention]

[0009] According to the present invention, it is possible to easily estimate the distribution of electric field intensity in a space in which a member that selectively transmits or blocks electromagnetic waves depending on the frequency is used. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a block diagram showing an example of the configuration of a field intensity distribution calculation device 10 according to an embodiment. [Figure 2] FIG. 2 is a diagram illustrating an example of the configuration of structure information 120 according to the embodiment. [Figure 3] FIG. 2 is a diagram illustrating an example of the configuration of electromagnetic characteristic information 121 according to the embodiment. [Figure 4] FIG. 2 is a diagram illustrating an example of the configuration of power supply equipment information 122 according to the embodiment. [Figure 5] FIG. 2 is a diagram illustrating an example of the configuration of location information 123 according to the embodiment. [Figure 6] FIG. 1 is a diagram illustrating electromagnetic characteristics of a structure including an FSS. [Figure 7] FIG. 1 is a diagram illustrating electromagnetic characteristics of a structure including an FSS. [Figure 8] FIG. 1 is a diagram illustrating electromagnetic characteristics of a structure including an FSS. [Figure 9] FIG. 1 is a diagram illustrating electromagnetic characteristics of a structure including an FSS. [Figure 10] 10A to 10C are diagrams illustrating processing performed by an estimation unit 133 according to an embodiment. [Figure 11] 10A to 10C are diagrams illustrating processing performed by an estimation unit 133 according to an embodiment. [Figure 12] 10A to 10C are diagrams illustrating processing performed by an estimation unit 133 according to an embodiment. [Figure 13] 10A to 10C are diagrams illustrating processing performed by an estimation unit 133 according to an embodiment. [Figure 14] 3A and 3B are diagrams showing examples of images displayed on a display unit 14 according to an embodiment. [Figure 15] 3A and 3B are diagrams showing examples of images displayed on a display unit 14 according to an embodiment. [Figure 16] 3A and 3B are diagrams showing examples of images displayed on a display unit 14 according to an embodiment. [Figure 17] 4 is a flowchart showing the flow of processing performed by the electric field intensity distribution calculation device 10 of the embodiment. [Figure 18] 10A and 10B are diagrams showing examples of images displayed on a display unit 14 according to a modified example of the embodiment. [Figure 19] 10A and 10B are diagrams showing examples of images displayed on a display unit 14 according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] An electric field intensity distribution calculation device 10 (an example of an electric field intensity distribution calculation system) according to an embodiment will be described below with reference to the drawings. In the following description, the manners of transmitting electromagnetic waves, reflecting electromagnetic waves, and absorbing electromagnetic waves will be collectively referred to as "blocking electromagnetic waves."

[0012] (Embodiment) First, an embodiment will be described. An electric field strength distribution calculation device 10 is a computer device that calculates the distribution of electric field strength in space. The space here refers to a space (target space) where wireless power supply is performed, and is a space surrounded by FSSs (Frequency Selective Surfaces). An FSS is a component that selectively blocks incident electromagnetic waves depending on their frequency. An FSS is an example of an "electromagnetic wave blocking component." An FSS is a component that is specially processed on its surface to block electromagnetic waves of a specific frequency. For example, an FSS is formed by processing the surface so that metal and non-metal materials are installed continuously. For example, a space where wireless power supply is performed is formed by covering the ceiling, floor, and walls with an electromagnetic wave control sheet formed of components including an FSS.

[0013] The electric field intensity distribution calculation device 10 calculates the distribution of the electric field intensity estimated in the virtual space by performing an electromagnetic wave simulation in the virtual space simulating the space in which wireless power feeding is performed.

[0014] 1 is a block diagram showing an example of the configuration of a field strength distribution calculation device 10 according to an embodiment of the present invention. The field strength distribution calculation device 10 includes, for example, a communication unit 11, a storage unit 12, and a control unit 13. The field strength distribution calculation device 10 is, for example, a computer device such as a PC (Personal Computer) or a server device.

[0015] 1 illustrates a case where the functional units of the storage unit 12 and the control unit 13 are implemented in the field strength distribution calculation device 10, but the present invention is not limited to this. The functional units of the field strength distribution calculation device 10 may be implemented in multiple computer devices. In this case, the embodiment is realized as a system (field strength distribution calculation system) configured by multiple computer devices.

[0016] The communication unit 11 is a functional unit that communicates with an external device and is realized by, for example, a general-purpose communication IC (Integrated Circuit). The communication unit 11 receives, for example, information used to calculate the distribution of electric field strength (for example, structure information 120 described later) from the external device. The communication unit 11 stores the received information in the storage unit 12 via, for example, the control unit 13.

[0017] The storage unit 12 is realized by, for example, a storage device (a storage device having a non-transitory storage medium) such as an HDD (Hard Disk Drive) or a flash memory, or a combination of these. The storage unit 12 stores programs for realizing each component of the electric field intensity distribution calculation device 10, variables used when executing the programs, and various information.

[0018] The storage unit 12 stores, for example, structure information 120, electromagnetic characteristic information 121, power supply facility information 122, and location information 123.

[0019] The structure information 120 is information indicating the shapes of structures constituting the space where wireless power supply is performed, such as walls, floors, ceilings, windows, partitions, etc., and information indicating the installation positions in the space. The structure information 120 is, for example, three-dimensional model information indicating structures in the virtual space as a three-dimensional point cloud (see FIG. 2).

[0020] The three-dimensional model information is, for example, information generated from a design drawing of the space in which wireless power supply is performed. Alternatively, the three-dimensional model information may be information generated by actually measuring (surveying) the space using a measuring device that measures distance. Examples of the measuring device assumed here include a tape measure and a laser rangefinder. The three-dimensional model information may also be generated using information obtained by a three-dimensional camera such as a LiDER (light detection and ranging) or a depth camera that can also measure depth, such as a stereo camera. The three-dimensional model information may also be information generated using a technology such as SLAM (Simultaneous Localization and Mapping), which is obtained by synthesizing multiple images captured from multiple imaging positions in a space using a monocular camera.

[0021] The electromagnetic characteristic information 121 is information that indicates the characteristics of the electromagnetic wave that is incident on the structure. For example, the electromagnetic characteristic information 121 is information that indicates the reflection coefficient, transmission coefficient, and diffraction coefficient of the structure for each frequency of the incident electromagnetic wave (see FIG. 3).

[0022] As already described, in this embodiment, the space in which wireless power supply is performed is surrounded by an electromagnetic wave control sheet. Therefore, for example, if a wall surface is covered with an electromagnetic wave control sheet, the electromagnetic characteristic information 121 indicates the reflection coefficient of the wall surface covered with the electromagnetic wave control sheet. For a structure having special electromagnetic characteristics, such as a wall surface covered with an electromagnetic wave control sheet, the special electromagnetic characteristics are estimated for each frequency using various simulations such as the finite-difference time-domain method (FDTD method), and the estimated electromagnetic characteristics are used as the electromagnetic characteristic information 121. Alternatively, the electromagnetic characteristic information 121 may be generated by irradiating an electromagnetic wave onto a wall surface covered with an electromagnetic wave control sheet and actually measuring (actually measuring) the intensity of the electromagnetic wave reflected from the wall surface, the intensity of the electromagnetic wave transmitted through the wall surface, and so on.

[0023] The power feeding facility information 122 is information relating to power feeding facilities installed in a space where wireless power feeding is performed. The power feeding facility information 122 is information including the installation position of the power feeding facility in the space (power feeding position) and the characteristics of the electromagnetic waves fed by the power feeding facility. The characteristics of the electromagnetic waves fed by the power feeding facility are, for example, information indicating the power (feed power) and directivity of the fed electromagnetic waves. The power feeding facility information 122 is created, for example, according to the power feeding method and power feeding mode (see FIG. 4).

[0024] The location information 123 is information indicating a location in a space where wireless power supply is performed. The location information 123 is, for example, information indicating the location of a charging area in the space where a power receiver brought in by a user is expected to be charged. The location information 123 includes, for example, information indicating the installation location of the charging area, and the lower and upper thresholds of the electromagnetic wave intensity (allowable electromagnetic wave intensity) allowed in the charging area (see FIG. 5).

[0025] The control unit 13 realizes its functions by executing programs stored in the memory unit 12 using processing units such as a CPU (Central Processing Unit) and a GPU (Graphics Processing Unit) as hardware provided in the electric field strength distribution calculation device 10.

[0026] The control unit 13 includes, for example, a structure information acquisition unit 130, an electromagnetic characteristic information acquisition unit 131, a power supply facility information acquisition unit 132, an estimation unit 133, a determination unit 134, and a device control unit 135.

[0027] The structure information acquisition unit 130 acquires structure information 120 by referring to the storage unit 12, and outputs the acquired information to the estimation unit 133. The electromagnetic characteristic information acquisition unit 131 acquires electromagnetic characteristic information 121 by referring to the storage unit 12, and outputs the acquired information to the estimation unit 133. The estimation unit 133 refers to the storage unit 12, and outputs the referenced information to the estimation unit 133.

[0028] The estimation unit 133 calculates the distribution of electric field strength estimated in the virtual space based on the structure information 120, the electromagnetic characteristic information 121, and the power supply equipment information 122. The estimation unit 133 calculates the distribution of electric field strength using an electromagnetic field analysis method such as a ray tracing method or an FDTD method. The distribution of electric field strength calculated by the estimation unit 133 is, for example, information in which the electric field strength at an arbitrary position in space is associated with the coordinates of that position. The estimation unit 133 outputs information indicating the distribution of electric field strength to the display unit 14, and causes the display unit 14 to display an image indicating the distribution of electric field strength.

[0029] If the calculated distribution of electric field strength satisfies a predetermined trial condition, the estimation unit 133 changes the installation position of the structure in the virtual space and recalculates the distribution of electric field strength to be estimated in the changed virtual space. The trial condition here is a condition under which the calculated distribution of electric field strength is determined to be insufficient as a space for wireless power supply. The trial condition may be set arbitrarily depending on the space for wireless power supply, and is, for example, a condition that a null point, which will be described later, exists in the space for wireless power supply or in a specific charging area (hereinafter referred to as the space, etc.) in the space for wireless power supply. Whether a null point exists in the space, etc. is determined by the determination unit 134.

[0030] For example, when the determination unit 134 determines that a null point exists in the space or the like in the distribution of electric field strength currently calculated, the estimation unit 133 may output information indicating this to the display unit 14 and cause the display unit 14 to display an image showing a message indicating that a null point exists in the space or the like together with the distribution of electric field strength. In this case, for example, a user viewing the image on the display unit 14 performs an operation input using a mouse or keyboard, and inputs information indicating how to change the installation position of a structure in the virtual space to the input unit 15. The estimation unit 133 changes the installation position of the structure in the virtual space based on the information input to the input unit 15, and generates changed structure information 120. The estimation unit 133 calculates the distribution of electric field strength estimated in the changed virtual space using the changed structure information 120.

[0031] The determination unit 134 determines whether or not a null point exists in space based on the distribution of electric field strength calculated by the estimation unit 133. A null point here refers to an area where the electric field strength is below a predetermined lower threshold (below the lower threshold) or an area where the electric field strength is equal to or less than the lower threshold. For example, the determination unit 134 determines whether or not the electric field strength at each position coordinate in space is below the lower threshold. The determination unit 134 determines that a null point exists when there is a position in space where the electric field strength is below the lower threshold.

[0032] The determination unit 134 may determine whether or not a null point exists in a specific area in space (e.g., a charging area). In this case, the determination unit 134 determines, for each position coordinate of the specific area in space, whether or not the electric field strength at that position is below a lower limit threshold. The determination unit 134 determines that a null point exists when a position where the electric field strength is below the lower limit threshold exists in the specific area in space.

[0033] The device control unit 135 comprehensively controls the electric field intensity distribution calculation device 10. For example, the device control unit 135 stores information received by the communication unit 11 and information input to the input unit 15 in the storage unit 12, or outputs the information to the estimation unit 133 or the like.

[0034] The display unit 14 includes, for example, a display device such as a liquid crystal display, and displays an image on the display device in accordance with the control unit 13. The display unit 14 displays, for example, an image showing the distribution of the electric field strength calculated by the estimation unit 133.

[0035] The input unit 15 includes an input device such as a mouse or a keyboard, acquires information input to the input device, and outputs the acquired information to the control unit 13.

[0036] FIG. 2 is a diagram illustrating an example of the configuration of structure information 120 according to an embodiment. The structure information 120 is generated, for example, for each space to which wireless power supply is performed. The structure information 120 includes, for example, items such as a structure ID and three-dimensional model information. The structure ID is information that uniquely identifies a structure installed in a space. The three-dimensional model information is information that indicates a three-dimensional model of a structure identified by the structure ID. Note that, in the example of this figure, the structure information 120 is information that indicates three-dimensional model information for each structure, but is not limited to this. The structure information 120 only needs to include information that indicates at least the shape of the structure and the installation position of the structure in the space.

[0037] FIG. 3 is a diagram illustrating an example of the configuration of electromagnetic characteristic information 121 according to an embodiment. The electromagnetic characteristic information 121 is generated, for example, for each space to which wireless power supply is performed. The electromagnetic characteristic information 121 includes, for example, items such as a structure ID, a reflection coefficient, a transmission coefficient, a diffraction coefficient, and an applicable frequency. The structure ID is information that uniquely identifies a structure installed in a space and corresponds to the structure ID indicated in the structure information 120. The reflection coefficient is information indicating, for example, the ratio of the intensity of an electromagnetic wave reflected from a structure to the intensity of an electromagnetic wave incident on the structure. The transmission coefficient is information indicating, for example, the ratio of the intensity of an electromagnetic wave transmitted through a structure to the intensity of an electromagnetic wave incident on the structure. The diffraction coefficient is information indicating the ratio of the intensity of an electromagnetic wave diffracted by the structure to the intensity of an electromagnetic wave incident on the structure. The applicable frequency is information indicating the frequency (or frequency band) of an electromagnetic wave to which the reflection coefficient and the like indicated for the structure identified by the structure ID are applied. When the reflection coefficient and other parameters vary depending on the frequency of the electromagnetic waves incident on a structure, the electromagnetic characteristics information 121 indicates the reflection coefficient and other parameters of the structure for each frequency (or frequency band) of the electromagnetic waves. Note that the configuration of the electromagnetic characteristics information 121 is not limited to the above. For example, the number of items in the electromagnetic characteristics information 121 may increase or decrease, or not all items may be filled in, depending on the method of electromagnetic field analysis or the characteristics of the structure (such as the size of the structure relative to the applied frequency or the electromagnetic behavior of the structure at the applied frequency). When the effect of a phenomenon is small and can be almost ignored, the information used to calculate the distribution of electric field intensity may be adjusted from the information stored in the electromagnetic characteristics information 121 to reduce the calculation load.

[0038] FIG. 4 is a diagram illustrating an example of the configuration of power feeding equipment information 122 according to an embodiment. The power feeding equipment information 122 is generated, for example, for each space where wireless power feeding is performed. The power feeding equipment information 122 includes, for example, items such as an equipment ID, a power feeding position, a power feeding mode 1, and a power feeding mode 2. The equipment ID is information that uniquely identifies the power feeding equipment installed in the space. The power feeding position is information that indicates the position where the power feeding equipment is installed in the space. The power feeding position is, for example, the position where a power feeding antenna of the power feeding equipment is installed. The power feeding mode 1, the power feeding mode 2, and the like are information that specifies the mode of wireless power feeding, for example, information that indicates a mode for high-speed charging. The power feeding mode 1 and the power feeding mode 2 include, for example, items such as feeding power and a power feeding antenna. The items included in the power feeding mode 1 and the power feeding mode 2 are information that indicates the characteristics of the electromagnetic waves fed (radiated) from the power feeding equipment. The feeding power is information that indicates the strength of the electromagnetic waves fed (radiated) from the power feeding equipment in terms of power. The power supply antenna is information indicating an antenna to be used when electromagnetic waves are radiated from the power supply equipment.

[0039] FIG. 5 is a diagram illustrating an example of the configuration of the location information 123 according to the embodiment. The location information 123 is generated, for example, for each space where wireless power supply is performed. The location information 123 is information indicating, for example, an area ID, location information, and allowable electromagnetic wave intensity. The area ID is information that uniquely identifies a specific area in the space. The specific area is an area in the space where the presence or absence of a null point is determined, such as a charging area. The installation location is information that indicates the location where the area identified by the area ID is installed. The allowable electromagnetic wave intensity is information that indicates the electromagnetic wave intensity allowable in the area identified by the area ID. The allowable electromagnetic wave intensity may include, for example, a lower threshold and an upper threshold. These thresholds are set based on the characteristics of the object to be charged used in the charging area. For example, if the electromagnetic wave intensity in the charging area falls below the lower threshold, the object to be charged in that charging area will not be charged. Furthermore, if the object to be charged is exposed to an electromagnetic field intensity that exceeds the rated value of the object to be charged, there is a risk of damage. For this reason, an upper threshold may be set so that the electromagnetic wave intensity in the charging area does not exceed the rated value of the object to be charged.

[0040] Here, we will explain the electromagnetic waves used for power supply in wireless power transmission. Generally, in wireless power transmission, in order for a power receiver to efficiently receive electromagnetic waves radiated from a power supply facility, attention must be paid to the polarization characteristics of the electromagnetic waves. For example, if the antenna provided in the power supply facility is a dipole antenna capable of radiating linearly polarized waves and is installed horizontally, the electromagnetic waves (wireless power) radiated from the power supply facility will be radiated into space as horizontally polarized waves. The power receiver must be equipped with at least an antenna capable of receiving the linearly polarized waves radiated from the antenna of the power supply facility. Furthermore, in order for the power receiver to efficiently receive power, the antenna on the power receiver side must be installed in the same direction as the vibration direction of the horizontally polarized waves, i.e., horizontally. This allows the power receiver to efficiently receive the horizontally polarized waves radiated from the power supply facility.

[0041] However, power supply equipment is often designed to radiate power in various directions, and therefore power receivers are often equipped with antennas that can receive power in any direction, such as double dipole antennas or patch antennas. Furthermore, the electromagnetic waves radiated from power supply equipment may be not only linearly polarized but also circularly polarized with a phase shift, and in the case of circular polarization, they may be right-handed or left-handed depending on the phase shift.

[0042] As described above, there are various polarization states in the electromagnetic waves radiated from the power supply equipment. Therefore, by using the electromagnetic characteristics of each component in the vibration direction, such as the horizontal and vertical components of the electromagnetic waves, it becomes possible to examine the distribution of the electric field strength from the viewpoint of whether it is possible to supply power efficiently.

[0043] Here, the electromagnetic characteristics of FSS or a structure covered with FSS will be explained using Figures 6 to 9. Figures 6 to 9 are diagrams for explaining the electromagnetic characteristics of a structure including FSS. In Figures 6 to 9, the horizontal axis represents frequency, and the vertical axis represents reflection intensity.

[0044] Figures 6 and 7 show the frequency characteristics showing the reflection intensity of electromagnetic waves (plane waves) incident on the FSS from the opposite direction (vertical direction) for each frequency. Figure 6 shows the reflection intensity of the horizontal component of the electromagnetic wave incident on the FSS (referred to as "TE wave" in Figure 6). Figure 7 shows the reflection intensity of the vertical component of the electromagnetic wave incident on the FSS (referred to as "TM wave" in Figure 7).

[0045] Figures 8 and 9 show frequency characteristics showing the reflection intensity for each frequency of an electromagnetic wave (plane wave) incident on the FSS from a direction that forms an angle of 30 degrees with the facing direction (vertical direction). Figure 8 shows the reflection intensity of the horizontal component of the electromagnetic wave incident on the FSS (referred to as "TE wave" in Figure 8). Figure 9 shows the reflection intensity of the vertical component of the electromagnetic wave incident on the FSS (referred to as "TM wave" in Figure 9).

[0046] As shown in Figures 6 and 7, for electromagnetic waves incident from a vertical direction, the reflection intensity at the peak frequency where the reflection intensity is greatest is approximately the same for both the horizontal and vertical components. On the other hand, as shown in Figures 8 and 9, for electromagnetic waves incident from a direction that forms an angle of 30 degrees with the vertical direction, the reflection intensity at the peak frequency is different for the horizontal and vertical components. This shows a unique reflection situation in the FSS, where the horizontal and vertical components of the electromagnetic wave have different intensities depending on the angle of incidence of the electromagnetic wave, resulting in a non-uniform distribution of polarization in the vibration direction of the electromagnetic wave.

[0047] As described above, the design of the FSS can change the polarization component, which is one of the important factors for a power receiver to efficiently receive power. If the polarization component of the electromagnetic wave changes due to the FSS, the power receiver may not be able to charge enough power (a null point may occur). Therefore, the electromagnetic behavior (electromagnetic characteristics) of the FSS is more complex than that of a typical metal surface. In other words, even if a wireless power transmission environment is estimated without fully considering the electromagnetic characteristics of the FSS, it is difficult to accurately estimate the electric field strength distribution. Alternatively, if the electric field strength distribution is measured in a real space where an actual structure is installed, the cause of the null point may be unknown, raising concerns about increased time and labor required to resolve the null point. To address this issue, in this embodiment, a simulation is performed taking into account the electromagnetic characteristics of the FSS to estimate the electromagnetic wave strength distribution in a space where wireless power is supplied. This reduces the time and labor required to construct a spatial environment, thereby contributing to labor savings.

[0048] Specifically, in this embodiment, the distribution of electric field strength is calculated taking into consideration the polarization state, in view of the fact that the reflection characteristics differ depending on the angle at which the electromagnetic wave is incident on the FSS. More specifically, in this embodiment, if the reflection coefficient, etc. differs depending on the horizontal and vertical components of the electromagnetic wave incident on a structure, the electromagnetic characteristic information 121 indicates the reflection coefficient, etc. at the structure for each horizontal and vertical component of the electromagnetic wave.

[0049] Furthermore, if the reflection coefficient or the like varies depending on the angle of incidence of the electromagnetic wave incident on the structure, the reflection coefficient or the like at the structure is indicated for each angle of incidence in the electromagnetic characteristics information 121. This makes it possible to calculate the distribution of electric field strength taking into account the state of polarization.

[0050] 10 to 13 are diagrams for explaining the processing performed by the estimation unit 133 of the embodiment.

[0051] FIG. 10 schematically shows the state in which electromagnetic waves DH are emitted from a power supply facility KS in a space TK. A structure KB is also installed in the space TK. FIG. 10 shows the state in which the electromagnetic waves DH emitted from the power supply facility KS are directly incident on the structure KB, but does not show the state in which the electromagnetic waves DH are reflected by the walls or the like of the space TK. As shown in the example of FIG. 10, if there is no obstacle or the like between the power supply facility KS and the structure KB in the space TK that blocks the electromagnetic waves DH, the electromagnetic waves DH are directly incident on the structure KB from the power supply facility KS.

[0052] Fig. 11 schematically shows electromagnetic waves DH1 being incident directly on the charging area JE from the power supply facility KS. Fig. 12 schematically shows electromagnetic waves DH1 and DH2 in Fig. 11 being incident on the charging area JE. Electromagnetic waves DH2 are electromagnetic waves that are incident on the charging area JE after being first incident on the structure KB from the power supply facility KS and then reflected by the structure KB and a wall surface located nearby.

[0053] As shown in Figures 11 and 12, multiple electromagnetic waves may arrive at a certain area (charging area JE) from multiple propagation paths. In this case, since the propagation paths of the multiple electromagnetic waves are different, the phases of the multiple electromagnetic waves incident on the area may be different from each other. For example, if the phase difference between two electromagnetic waves incident on the area is 180°, the two electromagnetic waves will interfere with each other, reducing the electric field intensity in the area. As a result, the area becomes a null point.

[0054] In this embodiment, if a null point exists in space, the installation position of a structure is changed. The structure whose installation position is changed here is, for example, a structure that exists in the propagation path of an electromagnetic wave that is indirectly incident on the null point. For example, in the example of FIG. 12, the installation position of a structure KB that exists in the propagation path of an electromagnetic wave DH2 that is indirectly incident on the charging area JE is changed.

[0055] Figure 13 shows a schematic example of the propagation path of electromagnetic waves after a change in the installation position of a structure. The example in Figure 13 shows structure KB#, where the installation position of structure KB has been changed in the direction of arrow CD. Electromagnetic waves incident on structure KB# are reflected by nearby walls and become electromagnetic waves DH2# that are incident on the ceiling, and are not incident on charging area JE. As a result, the only electromagnetic waves incident on charging area JE are electromagnetic waves DH1 that are incident directly from power supply equipment KS, so there is no interference between electromagnetic waves and the electric field strength in that area does not decrease. As a result, the null point is eliminated.

[0056] Here, examples of images (images showing the distribution of electric field intensity or the presence or absence of null points) displayed on the display unit 14 will be described with reference to Fig. 14 to Fig. 16. Fig. 14 to Fig. 16 are diagrams showing examples of images displayed on the display unit 14 according to the embodiment.

[0057] 14, for example, a propagation path of an electromagnetic wave radiated from the power supply facility KS is schematically displayed on the display unit 14. In this case, the estimation unit 133 estimates the propagation path of the electromagnetic wave radiated from the power supply facility KS, and outputs information indicating the estimation result to the display unit 14.

[0058] 15, the display unit 14 may display, for example, the distribution of the electric field strength in the space TK as a so-called heat map, with each strength being represented by a different color or pattern. In this case, the estimation unit 133 estimates, for example, the electric field strength for each position coordinate in the space TK, and outputs information indicating the estimation result to the display unit 14.

[0059] The user visually checks the image shown in FIG. 15 and recognizes, for example, that the electric field strength in the charging area JE is low and that a null point has occurred. The user then visually checks, for example, the image shown in FIG. 14, confirms the propagation path of the indirect wave incident on the charging area JE, extracts a structure KB that exists on the propagation path, and considers changing the installation position of the extracted structure KB. The user considers whether changing the installation position of the structure KB can change the electric field strength in the charging area JE and eliminate the null point. The user, for example, changes the installation position of the structure KB via the input unit 15 of the electric field strength distribution calculation device 10 and instructs the device to calculate the electric field strength distribution in the space TK after the change.

[0060] 16, the display unit 14 may display, for example, a charging area JE in the space TK and indicate whether a null point has occurred in the charging area JE. In this case, the estimation unit 133 estimates, for example, whether the electric field strength is below a threshold for each position coordinate of a predetermined area (here, the charging area JE) in the space TK, and if the electric field strength is below the threshold, outputs information indicating the position coordinate to the display unit 14.

[0061] Here, the flow of processing performed by the field intensity distribution calculation device 10 will be described with reference to Fig. 17. Fig. 17 is a flowchart showing the flow of processing performed by the field intensity distribution calculation device 10 of the embodiment.

[0062] The electric field strength distribution calculation device 10 acquires structure information 120, electromagnetic characteristic information 121, and power supply equipment information 122 in a space (target space) for which the distribution of the electric field strength is to be calculated (steps S1 to S3). The electric field strength distribution calculation device 10 estimates the distribution of the electric field strength for a virtual space corresponding to the target space using the acquired structure information 120, electromagnetic characteristic information 121, and power supply equipment information 122 (step S4). The electric field strength distribution calculation device 10 displays the estimation result on the display unit 14 (step S5). The electric field strength distribution calculation device 10 determines whether or not a null point exists in the virtual space (step S6). The electric field strength distribution calculation device 10 determines that a null point exists when there is an area in the virtual space where the electric field strength is below a threshold.

[0063] If the electric field intensity distribution calculation device 10 determines that a null point exists in the virtual space, it acquires structure information 120 after changing the installation position of the structure installed in the virtual space (step S7). The location of a structure installed in the virtual space and the direction in which the installation position is changed may be specified by, for example, a user's operation input, or may be automatically changed or adjusted. For example, the electric field intensity distribution calculation device 10 pre-sets the direction and amount of change when changing the installation position of a structure, such as 10 mm increments in the x direction up to a maximum of 150 mm. For example, if a null point exists in the virtual space, the electric field intensity distribution calculation device 10 changes the installation position of the structure according to the pre-set direction and amount of change. Alternatively, the electric field intensity distribution calculation device 10 automatically adjusts the direction and amount of change depending on the degree of electromagnetic field strength determined to be a null point. For example, if the electric field intensity at the null point is significantly lower than a lower threshold, the electric field intensity distribution calculation device 10 increases the amount of change beyond a pre-set value. On the other hand, if the electric field strength at the null point is not significantly lower than the lower threshold, the electric field strength distribution calculation device 10 sets the amount of change to the same as the preset value. The electric field strength distribution calculation device 10 acquires information indicating which structure and in which direction the installation position will be changed, and generates structure information 120 that reflects the acquired changes. The electric field strength distribution calculation device 10 returns to step S4 and estimates the distribution of electric field strength after the installation positions of the structures have been changed.

[0064] On the other hand, if the electric field strength distribution calculation device 10 determines that no null point exists in the virtual space, it acquires the distribution of electric field strength measured in a real space in which a structure is installed similarly to the virtual space (step S8). The electric field strength distribution calculation device 10 determines whether or not a null point exists in the real space (step S9). If there is an area where the electric field strength is below the threshold, it determines that a null point exists.

[0065] If the electric field intensity distribution calculation device 10 determines that no null points exist in the real space, it ends the process. On the other hand, if the electric field intensity distribution calculation device 10 determines that no null points exist in the real space, it returns to step S7 and changes the installation position of the structure.

[0066] As described above, the electric field intensity distribution calculation device 10 (an example of an electric field intensity distribution calculation system) of the embodiment includes the structure information acquisition unit 130, the electromagnetic characteristic information acquisition unit 131, the power supply facility information acquisition unit 132, the estimation unit 133, and the display unit 14 (an example of an output unit). The structure information acquisition unit 130 acquires structure information 120. The structure information 120 is structure information related to structures that constitute a target space, and includes information indicating the three-dimensional shape of the structure and information indicating the installation position of the structure in the target space. The electromagnetic characteristic information acquisition unit 131 acquires electromagnetic characteristic information 121. The electromagnetic characteristic information 121 is information indicating the characteristics of electromagnetic waves incident on a structure. The power supply facility information acquisition unit 132 acquires the power supply facility information 122. The power supply equipment information 122 is power supply equipment information related to power supply equipment to be installed in the target space, and includes information indicating the installation position of the power supply equipment in the target space and the characteristics of the electromagnetic waves supplied by the power supply equipment. The estimation unit 133 calculates an estimated electric field intensity distribution in a virtual space corresponding to the target space using the structure information 120, the electromagnetic characteristic information 121, and the power supply equipment information 122. The display unit 14 displays the calculation results calculated by the estimation unit 133. The structures include FSSs. The FSSs are components (electromagnetic wave blocking components) that selectively block electromagnetic waves incident on the structure depending on the frequency of the electromagnetic waves.

[0067] As a result, the electric field intensity distribution calculation device 10 of the embodiment can calculate the distribution of the electric field intensity using the electromagnetic characteristics of the FSS included in the structure, making it possible to easily estimate the distribution of the electric field intensity in a space where an FSS (a member that selectively blocks electromagnetic waves according to frequency) is used.

[0068] The electric field intensity distribution calculation device 10 of the embodiment includes a structure information acquisition unit 130, an electromagnetic characteristic information acquisition unit 131, a power supply facility information acquisition unit 132, an estimation unit 133, a determination unit 134, and a display unit 14. The determination unit 134 determines whether the electric field intensity in the charging area (a predetermined region in the target space) is greater than a threshold value based on the calculation result calculated by the estimation unit 133. The display unit 14 displays the determination result determined by the determination unit 134.

[0069] As a result, the electric field intensity distribution calculation device 10 of the embodiment can determine whether or not a null point exists in space by using the electromagnetic characteristics of the FSS included in the structure. Therefore, it is possible to easily estimate the presence or absence of a null point even in a space where a structure including an FSS is installed.

[0070] The electric field intensity distribution calculation device 10 of the embodiment includes a structure information acquisition unit 130, an electromagnetic characteristic information acquisition unit 131, a power supply facility information acquisition unit 132, an estimation unit 133, a determination unit 134, and a display unit 14. The determination unit 134 determines whether the electric field intensity in the charging area (a predetermined region in the target space) is greater than a threshold value based on the calculation result calculated by the estimation unit 133. The display unit 14 displays the determination result determined by the determination unit 134.

[0071] Furthermore, in the electric field intensity distribution calculation device 10 of the embodiment, the structure information 120 may include frequency characteristics indicating the relationship between the frequency and reflection intensity of the electromagnetic wave incident on the structure. Furthermore, the structure information 120 may include information indicating each horizontal component and vertical component of the electromagnetic wave incident on the structure. Furthermore, the structure information 120 may include information indicating each angle of incidence of the electromagnetic wave incident on the structure. This allows the electric field intensity distribution calculation device 10 of the embodiment to calculate the electric field intensity distribution according to the frequency of the electromagnetic wave, and to accurately estimate the electric field intensity distribution or the presence or absence of a null point even if the FSS selectively blocks the electromagnetic wave according to the frequency. Furthermore, even if the FSS has different reflection characteristics for the horizontal and vertical components of the electromagnetic wave, the electric field intensity distribution or the presence or absence of a null point can be accurately estimated. Furthermore, even if the FSS has different reflection characteristics depending on the angle of incidence of the electromagnetic wave, the electric field intensity distribution or the presence or absence of a null point can be accurately estimated.

[0072] (Modification of the embodiment) Here, a modified example of the embodiment will be described. This modified example differs from the above-described embodiment in that the display unit 14 displays the distribution of the electric field intensity in a cross section of space.

[0073] 18 and 19 are diagrams showing examples of images displayed on the display unit 14 according to a modified example of the embodiment. Similar to FIG. 15, FIG. 18 shows the distribution of electric field strength in the space TK in a heat map, and further shows a cross section DM along the vertical direction slightly in front of the power supply equipment KS. FIG. 19 shows the distribution of electric field strength in the cross section DM shown in FIG. 18 in a heat map. In this manner, the distribution of electric field strength in the cross section DM may be shown. By showing the distribution of electric field strength in a cross section, it is possible to see the tendency for the electric field strength to decrease with distance from the power supply equipment KS. It is also possible to see the tendency for the electric field strength to decrease in areas blocked by structures such as tables and chairs.

[0074] In the above-described embodiment, the determination unit 134 determines whether or not there is a null point, but the present invention is not limited to this. For example, the determination unit 134 may determine whether or not a high-power point exists. Here, a high-power point is a region where the electric field strength exceeds a predetermined upper threshold or a region where the electric field strength is equal to or greater than the upper threshold. For example, the determination unit 134 determines, for each position coordinate in space, whether the electric field strength at that position exceeds the upper threshold, based on the distribution of the electric field strength calculated by the estimation unit 133. The determination unit 134 determines a position where the electric field strength exceeds the upper threshold as a high-power point. If there is a position in space where the electric field strength exceeds the upper threshold, the determination unit 134 determines that a high-power point exists.

[0075] All or part of the electric field strength distribution calculation device 10 in the above-described embodiment may be implemented by a computer. In this case, a program for implementing the functions may be recorded on a computer-readable recording medium, and the program may be loaded into a computer system and executed. Note that the term "computer system" as used herein includes hardware such as an OS and peripheral devices. Furthermore, the term "computer-readable recording medium" refers to portable media such as flexible disks, optical magnetic disks, ROMs, and CD-ROMs, as well as storage devices such as hard disks built into a computer system. Furthermore, the term "computer-readable recording medium" may also include devices that dynamically store programs for a short period of time, such as communication lines used when transmitting programs via networks such as the Internet or telephone lines, or devices that store programs for a fixed period of time, such as volatile memory within a computer system serving as a server or client. The program may be for implementing part of the functions described above, or may be capable of implementing the functions in combination with a program already stored in the computer system, or may be implemented using a programmable logic device such as an FPGA.

[0076] Although an embodiment of the present invention has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and includes designs within the scope of the gist of the present invention. [Explanation of symbols]

[0077] 10...Field strength distribution calculation device (field strength distribution calculation system) 130...Structure information acquisition department 131...Electromagnetic characteristic information acquisition unit 132...Power supply equipment information acquisition unit 133...Estimation part 134...Judgment section

Claims

1. a structure information acquisition unit that acquires structure information related to structures that constitute the target space, the structure information including information indicating the three-dimensional shape of the structure and information indicating the installation position of the structure in the target space; an electromagnetic characteristic information acquisition unit that acquires electromagnetic characteristic information indicating characteristics of electromagnetic waves incident on the structure; a power supply equipment information acquisition unit that acquires power supply equipment information related to power supply equipment to be installed in the target space, the power supply equipment information including information indicating an installation position of the power supply equipment in the target space and characteristics of electromagnetic waves supplied by the power supply equipment; an estimation unit that calculates an estimated electric field intensity distribution in a virtual space corresponding to the target space based on the structure information, the electromagnetic characteristic information, and the power supply facility information; an output unit that outputs the calculation result calculated by the estimation unit; Equipped with the structure includes an electromagnetic wave blocking member that selectively blocks electromagnetic waves according to the frequency of the electromagnetic waves incident on the structure, the electromagnetic wave blocking member is a member that reflects electromagnetic waves with different reflection intensities depending on a combination of the frequency and incident angle of the electromagnetic waves, the electromagnetic characteristic information is information indicating a reflection intensity according to a combination of a frequency and an incident angle of an electromagnetic wave incident on the structure covered with the electromagnetic wave blocking member, the estimation unit uses the electromagnetic characteristic information to calculate, for each region provided in the target space, an estimated electric field intensity distribution in the virtual space by combining the radio wave intensities of a direct wave that arrives directly from the power supply equipment and a reflected wave that arrives after the electromagnetic wave is incident on the structure and is reflected with a reflection intensity according to a combination of a frequency and an incident angle. Electric field strength distribution calculation system.

2. a structure information acquisition unit that acquires structure information related to structures that constitute the target space, the structure information including information indicating the three-dimensional shape of the structure and information indicating the installation position of the structure in the target space; an electromagnetic characteristic information acquisition unit that acquires electromagnetic characteristic information indicating characteristics of electromagnetic waves incident on the structure; a power supply equipment information acquisition unit that acquires power supply equipment information related to power supply equipment to be installed in the target space, the power supply equipment information including information indicating an installation position of the power supply equipment in the target space and characteristics of electromagnetic waves supplied by the power supply equipment; an estimation unit that calculates an estimated electric field intensity distribution in a virtual space corresponding to the target space based on the structure information, the electromagnetic characteristic information, and the power supply facility information; a determination unit that determines whether or not the electric field strength in a predetermined region in the target space is greater than a threshold value based on the calculation result calculated by the estimation unit; an output unit that outputs the determination result determined by the determination unit; Equipped with the structure includes an electromagnetic wave blocking member that selectively blocks electromagnetic waves according to the frequency of the electromagnetic waves incident on the structure, the electromagnetic wave blocking member is a member that reflects electromagnetic waves with different reflection intensities depending on a combination of the frequency and incident angle of the electromagnetic waves, the electromagnetic characteristic information is information indicating a reflection intensity according to a combination of a frequency and an incident angle of an electromagnetic wave incident on the structure covered with the electromagnetic wave blocking member, the estimation unit uses the electromagnetic characteristic information to calculate, for each region provided in the target space, an estimated electric field intensity distribution in the virtual space by combining the radio wave intensities of a direct wave that arrives directly from the power supply equipment and a reflected wave that arrives after the electromagnetic wave is incident on the structure and is reflected with a reflection intensity according to a combination of a frequency and an incident angle. Electric field strength distribution calculation system.

3. when it is determined that there is an area in the virtual space where the electric field strength is less than a threshold based on the previously calculated electric field strength distribution, the estimation unit changes an installation position of the structure that is present in a propagation path of an electromagnetic wave that is indirectly incident on the area where the electric field strength is less than the threshold, and calculates an estimated electric field strength distribution in the virtual space using the structure information that reflects the change.

3. The electric field strength distribution calculation system according to claim 1 or 2.

4. when it is determined based on the previously calculated electric field strength distribution that there is no area in the virtual space where the electric field strength is less than the threshold, and when it is determined based on the measurement value of the electric field strength distribution measured in the target space in which the installation of the structure in the virtual space is reflected that there is an area in the target space where the electric field strength is less than the threshold, the estimation unit changes the installation position of the structure that is present in the propagation path of the electromagnetic wave that is indirectly incident on the area in the virtual space where the electric field strength is less than the threshold, and calculates the electric field strength distribution to be estimated in the virtual space using the structure information in which the change is reflected; The electric field intensity distribution calculation system according to any one of claims 1 to 3.

5. A computer-implemented method for calculating a field strength distribution, comprising: a structure information acquisition unit acquires structure information relating to a structure constituting the target space, the structure information including information indicating a three-dimensional shape of the structure and information indicating an installation position of the structure in the target space; an electromagnetic characteristic information acquisition unit acquires electromagnetic characteristic information indicating characteristics of electromagnetic waves incident on the structure; a power supply equipment information acquisition unit acquires power supply equipment information related to power supply equipment to be installed in the target space, the power supply equipment information including information indicating an installation position of the power supply equipment in the target space and characteristics of electromagnetic waves supplied by the power supply equipment; an estimation unit calculates an estimated electric field strength distribution in a virtual space corresponding to the target space based on the structure information, the electromagnetic characteristic information, and the power supply facility information; an output unit that outputs the calculation result calculated by the estimation unit; the structure includes an electromagnetic wave blocking member that selectively blocks electromagnetic waves according to the frequency of the electromagnetic waves incident on the structure, the electromagnetic wave blocking member is a member that reflects electromagnetic waves with different reflection intensities depending on a combination of the frequency and incident angle of the electromagnetic waves, the electromagnetic characteristic information is information indicating a reflection intensity according to a combination of a frequency and an incident angle of an electromagnetic wave incident on the structure covered with the electromagnetic wave blocking member, the estimation unit calculates an estimated electric field intensity distribution in the virtual space by using the electromagnetic characteristic information to combine, for each region provided in the target space, the radio wave intensities of a direct wave that arrives directly from the power supply equipment and a reflected wave that arrives after the electromagnetic wave is incident on the structure and is reflected with a reflection intensity according to a combination of a frequency and an incident angle. Electric field strength distribution calculation method.

6. A computer-implemented method for calculating a field strength distribution, comprising: a structure information acquisition unit acquires structure information relating to a structure constituting the target space, the structure information including information indicating a three-dimensional shape of the structure and information indicating an installation position of the structure in the target space; an electromagnetic characteristic information acquisition unit acquires electromagnetic characteristic information indicating characteristics of electromagnetic waves incident on the structure; a power supply equipment information acquisition unit acquires power supply equipment information related to power supply equipment to be installed in the target space, the power supply equipment information including information indicating an installation position of the power supply equipment in the target space and characteristics of electromagnetic waves supplied by the power supply equipment; an estimation unit calculates an estimated electric field strength distribution in a virtual space corresponding to the target space based on the structure information, the electromagnetic characteristic information, and the power supply facility information; a determination unit that determines whether or not the electric field strength in a predetermined region in the target space is greater than a threshold value based on the calculation result calculated by the estimation unit; an output unit outputs the determination result determined by the determination unit; the structure includes an electromagnetic wave blocking member that selectively blocks electromagnetic waves according to the frequency of the electromagnetic waves incident on the structure, the electromagnetic wave blocking member is a member that reflects electromagnetic waves with different reflection intensities depending on a combination of the frequency and incident angle of the electromagnetic waves, the electromagnetic characteristic information is information indicating a reflection intensity according to a combination of a frequency and an incident angle of an electromagnetic wave incident on the structure covered with the electromagnetic wave blocking member, the estimation unit calculates an estimated electric field intensity distribution in the virtual space by using the electromagnetic characteristic information to combine, for each region provided in the target space, the radio wave intensities of a direct wave that arrives directly from the power supply equipment and a reflected wave that arrives after the electromagnetic wave is incident on the structure and is reflected with a reflection intensity according to a combination of a frequency and an incident angle. Electric field strength distribution calculation method.

7. A program for causing a computer to operate as the electric field strength distribution calculation system according to any one of claims 1 to 4, the program causing the computer to function as each unit included in the electric field strength distribution calculation system.

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