JP7700879B2 - Analysis device, analysis method, and program - Google Patents

Description

The present disclosure relates to an analysis device, an analysis method, and a program .

When wireless communication equipment that transmits radio waves from a reference point is installed at the receiving point, the receiving points within the range that the radio waves can reach are calculated based on the reference point of the radio waves. Patent Document 1 discloses a technology that can shorten the time required for such calculations related to radio waves.

Patent document 1 discloses a technology that reduces the amount of calculation processing by reducing the amount of data to be calculated for reflection points in advance when calculating the trajectory of radio waves propagating from the transmitting point to the receiving point.

Japanese Patent Application Publication No. 2003-318811

In radio communication technology such as that described above, there is a demand for technology that reduces the amount of calculation required to calculate a receiving point where the receiving sensitivity of radio waves transmitted from a reference point satisfies a standard.

An example of a purpose of this disclosure is to provide an analysis device, an analysis method, and a program that solve the above-mentioned problems.

According to a first aspect of the present disclosure, the analysis device includes a transmission distance calculation means for calculating a transmission distance of radio waves transmitted from a reference point; a candidate point identification means for plotting a plurality of virtual points spaced apart from one another at a predetermined interval on a straight line in space from the reference point to an initial reception point spaced from the reference point by the transmission distance, and identifying a plurality of ridgeline candidate points indicating points on the Earth's surface corresponding to the plurality of virtual points; a calculated position determination means for eliminating one or more of the plurality of ridgeline candidate points using an algorithm for simplifying the characteristics of a broken line formed by sequentially connecting the plurality of ridgeline candidate points; and a reception point determination means for calculating reception sensitivities at positions corresponding to the ridgeline candidate points among the plurality of ridgeline candidate points other than the one or more eliminated ridgeline candidate points, in order from the ridgeline candidate points furthest from the reference point, and determining the ridgeline candidate point furthest from the reference point among the ridgeline candidate points whose calculated reception sensitivities at the corresponding positions satisfy a reference reception sensitivity as the reception point of the radio waves.

According to a second aspect of the present disclosure, the analysis method includes: calculating a transmission distance of radio waves transmitted from a reference point; plotting a plurality of virtual points spaced apart from one another at a predetermined interval on a straight line in space from the reference point to an initial reception point spaced apart from the reference point by the transmission distance; identifying a plurality of ridgeline candidate points indicating points on the Earth's surface corresponding to the plurality of virtual points; eliminating one or more of the plurality of ridgeline candidate points using an algorithm that simplifies the characteristics of a broken line formed by sequentially connecting the plurality of ridgeline candidate points; calculating reception sensitivities at positions corresponding to the ridgeline candidate points among the plurality of ridgeline candidate points other than the one or more eliminated ridgeline candidate points, beginning with the ridgeline candidate points furthest from the reference point; and determining, as the reception point of the radio waves, the ridgeline candidate point furthest from the reference point among the ridgeline candidate points whose calculated reception sensitivities at the corresponding positions satisfy a reference reception sensitivity.

According to a third aspect of the present disclosure, the recording medium stores a program for causing a computer of an analysis device to execute the following operations: calculate a transmission distance of radio waves transmitted from a reference point; plot a plurality of virtual points spaced apart at a predetermined interval on a straight line in space from the reference point to an initial reception point spaced apart from the reference point by the transmission distance; identify a plurality of ridgeline candidate points indicating points on the Earth's surface corresponding to the plurality of virtual points; eliminate one or more of the plurality of ridgeline candidate points using an algorithm that simplifies the characteristics of a broken line formed by sequentially connecting the plurality of ridgeline candidate points; calculate reception sensitivities at positions corresponding to the ridgeline candidate points among the plurality of ridgeline candidate points other than the one or more eliminated ridgeline candidate points, beginning with the ridgeline candidate points furthest from the reference point; and determine, as the reception point of the radio waves, the ridgeline candidate point furthest from the reference point among the ridgeline candidate points whose calculated reception sensitivities at the corresponding positions satisfy a reference reception sensitivity.

According to the present disclosure, it is possible to provide an analysis device that can reduce the amount of calculation required to calculate a receiving point where the receiving sensitivity of radio waves transmitted from a reference point satisfies a standard.

FIG. 2 is a functional block diagram of the analysis device according to the present embodiment. FIG. 4 is a diagram showing a processing flow of the analysis device according to the present embodiment. FIG. 1 is a first diagram showing an overview of processing performed by the analysis device according to the present embodiment. FIG. 11 is a second diagram showing an outline of the processing performed by the analysis device according to the present embodiment. FIG. 11 is a third diagram showing an outline of the processing performed by the analysis device according to the present embodiment. FIG. 4 is a fourth diagram showing an outline of the processing performed by the analysis device according to the present embodiment. FIG. 5 is a fifth diagram showing an outline of the processing performed by the analysis device according to this embodiment. FIG. 6 is a sixth diagram showing an outline of the processing performed by the analysis device according to this embodiment. FIG. 7 is a seventh diagram showing an outline of the processing performed by the analysis device according to this embodiment. FIG. 13 is a diagram showing another example of the configuration of an analysis device according to the present embodiment. FIG. 11 is a diagram showing a process flow by the analysis device shown in FIG. 10 . FIG. 2 is a hardware configuration diagram of an analysis device according to the present embodiment.

Hereinafter, an analysis device according to an embodiment of the present disclosure will be described with reference to the drawings.
FIG. 1 is a functional block diagram of an analysis device according to this embodiment.
The analysis device 1 is a computer. By executing an analysis program, the analysis device 1 has the functions of an input unit 112, a display unit 113, a control unit 114, a transmission distance calculation unit 115, a ridgeline candidate point identification unit 116, a calculated position determination unit 117, a reception point determination unit 118, and a result processing unit 119. The analysis device 1 also stores in advance in the storage unit 111 topographical information including map data, communication device parameters, and altitude data.

The map data includes the position of the reference point P1.
The communication device parameters are parameters related to the reference point P1 from which the analysis device 1 transmits radio waves and the wireless communication device to be installed at the receiving point to receive the radio waves. Specifically, the parameters are values such as the position of the reference point P1 where the wireless communication device is to be installed, the transmission power Ws [dB] of the wireless communication device to be installed at the reference point P1, the transmission antenna gain Ps [dB] of the wireless communication device to be installed at the reference point P1, the receiving antenna gain Pr [dB] of the wireless communication device to be installed at the receiving point, the receiving sensitivity Wr [dB] of the wireless communication device to be installed at the receiving point, the frequency f [MHz] of the radio waves, and other loss values Lo [dB].
The topographical information is information that indicates the altitude corresponding to each position (latitude, longitude) in the map data.

The input unit 112 performs a process of acquiring information used by the analysis device 1 for processing from an input device such as a keyboard, a mouse, or a touch panel.
The display unit 113 displays the processing results of the analysis device 1 on a display or the like.
The control unit 114 controls the input unit 112, the display unit 113, the transmission distance calculation unit 115, the edge line candidate point identification unit 116, the calculated position determination unit 117, the reception point determination unit 118, the result processing unit 119, and the like.

The transmission distance calculation unit 115 calculates the transmission distance of the radio wave transmitted from the reference point P1.
The ridge candidate point identification unit 116 calculates the positions of virtual points Ps plotted at predetermined intervals on a straight line in space from a reference point P1 to an initial reception point P2 that is separated from the reference point P1 by a transmission distance d [km], and identifies ridge candidate points Pn that indicate points on the ground surface corresponding to each virtual point Ps.
The calculation position determination unit 117 uses an algorithm that simplifies the characteristics of the broken line that sequentially connects the ridge candidate points Pn from the reference point P1 side to the initial reception point P2 side, and determines multiple calculation positions for calculating the reception sensitivity from among the ridge candidate points Pn by eliminating one or more of the ridge candidate points Pn.
The reception point determination unit 118 calculates the reception sensitivity at each of the multiple calculated positions, starting from the calculation position farthest from the reference point P1, and determines the calculated position farthest from the reference point P1 that satisfies the reference reception sensitivity as the reception point P of the radio wave.
The result processing unit 119 performs processing such as outputting the analysis results of the analysis device 1 .

The analysis device 1 that performs such functions can reduce the amount of calculation required to determine the calculation target point farthest from the reference point P1 that satisfies the reference reception sensitivity as the radio wave reception point P. The processing flow of the analysis device 1 is described below.

FIG. 2 is a diagram showing a process flow of the analysis device.
3 to 9 are diagrams showing an outline of the processing performed by the analysis device.
A user of the analysis device 1 issues an instruction to start processing from an input device. When the input unit 112 receives the instruction to start processing from the input device, the input unit 112 outputs the instruction to the control unit 114. The control unit 114 issues an instruction to start processing to the transmission distance calculation unit 115. The transmission distance calculation unit 115 acquires communication device parameters recorded in the storage unit 111. As described above, the communication device parameters include the position of the reference point P1 where the wireless communication device is installed, the transmission power Ws [dB], the transmission antenna gain Ps [dB], the receiving antenna gain Pr [dB], the receiving sensitivity Wr [dB], the radio wave frequency f [MHz], and other loss values Lo [dB].

The transmission distance calculation unit 115 inputs the communication device parameters into formula (1) to calculate the free space transmission distance d (step S101). The free space transmission distance d [m] indicates the longest distance at which radio waves from a wireless communication device can be received with a sensitivity equal to or higher than the receiving sensitivity Wr when the wireless communication device is installed at the reference point P1.

The above-mentioned calculation formula (1) of the free space transmission distance d is an example. As long as it is possible to calculate the free space transmission distance d of the wireless communication device based on the reference point P1, the calculation formula (1) may be another formula. The transmission distance calculation unit 115 outputs the free space transmission distance d to the edge candidate point identification unit 116.

The ridgeline candidate point identification unit 116 acquires the coordinates (latitude, longitude, altitude) of the reference point P1 based on the communication device parameters and the altitude data. The ridgeline candidate point identification unit 116 calculates the coordinates of the initial reception point P2, which is separated from the coordinates of the reference point P1 by the distance indicated by the free space transmission distance d in a predetermined communication direction (step S102). The coordinates of the initial reception point P2 are clear if the free space transmission distance d is added to the communication direction from the coordinates of the reference point P1. Note that information on the communication direction may be included in the communication device parameters or may be recorded separately in the storage unit 111. Note that the height of the reference point P1 from the ground surface and the height of the initial reception point P2 from the ground surface may be a preset height, such as 5 m or 10 m.

The ridgeline candidate point identification unit 116 calculates a straight line L1 in the space from the reference point P1 to the initial reception point P2 (step S103). The ridgeline candidate point identification unit 116 acquires map data including the range from the reference point P1 to the initial reception point P2 and elevation data from the storage unit 111. The ridgeline candidate point identification unit 116 generates 3D modeling data of the ground surface E from the reference point P1 to the initial reception point P2 based on the map data including the range from the reference point P1 to the initial reception point P2 and the elevation data (step S104). The ridgeline candidate point identification unit 116 calculates virtual points Ps at predetermined intervals on the straight line L1 in the space from the reference point P1 to the initial reception point P2 (step S105). The ridgeline candidate point identification unit 116 identifies the intersections of the perpendicular lines passing through each of the virtual points Ps with the ground surface E shown in the 3D modeling data of the ground surface E as ridgeline candidate points Pn1 to Pn18 (step S106). The ridgeline candidate point identification unit 116 outputs the coordinates (latitude, longitude, altitude) of the ridgeline candidate points Pn1 to Pn18 to the calculated position determination unit 117. The ridgeline candidate points Pn1 to Pn18 are collectively referred to as ridgeline candidate points Pn (see FIG. 3).

The calculation position determination unit 117 uses an algorithm that simplifies the characteristics of the broken line that connects the multiple edge candidate points Pn in order to reduce one or more of the multiple edge candidate points Pn and determine a calculation position for calculating the reception sensitivity from the edge candidate points (step S107). An example of this algorithm is the Ramer-Douglas-Peucker algorithm. Any algorithm may be used as long as it simplifies the characteristics of the broken line. The calculation position determination unit 117 outputs the coordinates (latitude, longitude, altitude) of the calculation position to the reception point determination unit 118. In the example shown in FIG. 4, the Ramer-Douglas-Peucker algorithm identifies edge candidate points Pn1, Pn3, Pn4, Pn7, Pn9, Pn10, Pn11, Pn14, Pn17, and Pn18 that are prominent as characteristics of the broken line, and the calculation position determination unit 117 identifies them as the calculation position (see FIG. 4).

The reception point determination unit 118 determines whether or not a diffraction point on the ground can be identified based on the ridge candidate point Pn (step S108). In order to identify a diffraction point on the ground, the reception point determination unit 118 compares, for example, a selected ridge candidate point Pn with two comparison target ridge candidate points Pn on both sides of the selected ridge candidate point Pn. If the selected ridge candidate point Pn is located higher than the straight line connecting the two comparison target ridge candidate points Pn, the reception point determination unit 118 identifies the selected ridge candidate point Pn as a diffraction point. For example, as shown in FIG. 5, based on the altitude of points A, B, and C corresponding to the ridge candidate point Pn, if point B sandwiched between points A and C as in part (A) of FIG. 5 is located lower than the straight line connecting points A and C (to the right of the straight line in the direction from the reference point P1 to the initial reception point P2), the reception point determination unit 118 determines that point B is not a diffraction point. On the other hand, the reception point determination unit 118 determines that point B can be specified as a diffraction point when it is located at a position higher than the straight line connecting points A and C (to the left of the straight line from the reference point P1 toward the initial reception point P2) as shown in part (B) of Fig. 5. If no diffraction points can be specified (step 108: No), the reception point determination unit 118 determines the initial reception point P2 as the reception point P for installing the wireless communication device (step S109). As an example, the reception point determination unit 118 specifies Pn10 and Pn11 as diffraction points as shown in Fig. 6.

If the diffraction point is identified (step 108: Yes), the reception point determination unit 118 identifies the reception point candidate Pm based on the reference point P1, the diffraction points Pn10, Pn11, and the ridgeline candidate point Pn18, which is the calculated position farthest from the reference point P1, as shown in FIG. 7, for example. The coordinates of the reception point candidate Pm are the coordinates obtained by adding a predetermined height to the altitude of the ridgeline candidate point Pn18. The predetermined height may be a value recorded as a communication parameter in the storage unit 111, such as 5 m or 10 m, as the height of a communication device such as an antenna. The reception point determination unit 118 calculates the diffraction loss J(v) of the radio wave transmitted from the reference point P1, diffracted at the diffraction points Pn10 and Pn11, and received at the reception point candidate Pm using the following formula (2) (step S110). In equation (2), J(v) is the diffraction loss, λ is the wavelength of the radio wave, d1 is the distance from the reference point P1 to the diffraction point which is an obstruction, d2 is the distance from the reception point candidate Pm to the diffraction point which is an obstruction, and h is the height of the diffraction point from the straight line in space between the reference point P1 and the reception point candidate Pm.

Specifically, the following formula (2) is used to calculate the diffraction loss J(v)-1 of the radio wave between the reference point P1 and the diffraction point Pn10, with d1 being the distance between the reference point P1 and the diffraction point Pn10, and d2 being the distance between the diffraction point Pn10 and the diffraction point Pn11. Similarly, the diffraction loss J(v)-2 of the radio wave between the diffraction point Pn10 and the reception point candidate Pm is calculated, with d1 being the distance between the diffraction point Pn10 and the diffraction point Pn11, and d2 being the distance between the diffraction point Pn11 and the reception point candidate Pm. The sum of the diffraction loss J(v)-1 and the diffraction loss J(v)-2 is calculated as the diffraction loss J(v). If there is only one diffraction point, the diffraction loss J(v) can be calculated by a single calculation of the following formula (2). If there are three diffraction points Pn (N=3), then, with reference point P1, diffraction point PnX (X=1 to N), and initial reception point P2, the diffraction loss J(v) can be calculated by adding together the first diffraction loss in the section P1-Pn1-Pn2, the second diffraction loss in the section Pn1-Pn2-Pn3, and the third diffraction loss in the section Pn2-Pn3-P2.

The "v" in the diffraction loss J(v) in equation (2) is called the diffraction parameter, and can be expressed by equation (3). If the value of the diffraction parameter v is -0.78 or more, it means that the loss includes the proximity loss, and if it is less than -0.78, it means that the diffraction loss does not include the proximity loss.

The reception point determination unit 118 calculates the reception sensitivity W at a new reception point candidate Pm for radio waves transmitted from the reference point P1, diffracted at diffraction points Pn10 and Pn11, and received at the new reception point candidate Pm using equation (4) (step S111).

In equation (4), Ws is the transmission power of the wireless communication device installed at reference point P1, Ps is the transmitting antenna gain of the wireless communication device installed at reference point P1, Pr is the receiving antenna gain of the wireless communication device installed at the receiving point, d is the transmission distance (the distance between reference point P1 and the candidate receiving point Pm), f is the frequency, Ls is the diffraction loss (= J(v)), and Lo is other losses. The calculation formula for receiving sensitivity W in equation (4) can be defined as "receiving sensitivity = transmitting power + gain - diffraction loss".

The reception point determination unit 118 acquires the value of the reception sensitivity Wr of the wireless communication device to be installed at the reception point from the storage unit 111. The reception point determination unit 118 determines whether the reception sensitivity W at the reception point candidate Pm is equal to or greater than the reception sensitivity Wr of the wireless communication device to be installed at the reception point (step S112). If the reception sensitivity W at the reception point candidate Pm is equal to or greater than the reception sensitivity Wr of the wireless communication device to be installed at the reception point (step S112: Yes), the reception point determination unit 118 determines the reception point candidate Pm as the reception point P for installing the wireless communication device (step S113). If the reception sensitivity W at the reception point candidate Pm is not equal to or greater than the reception sensitivity Wr of the wireless communication device to be installed at the reception point P (step S112: No), the reception point determiner 118 specifies a new reception point candidate Pm based on the ridgeline candidate point Pn17 at the next calculation position farthest from the reference point P1, excluding the already specified reception point candidate Pm, as shown in Fig. 8 (step S114).Then, the reception point determiner 118 repeats the calculation process of the diffraction loss J(v) in step S110.

This allows the coordinates of the reception points of the wireless communication device to be installed to be calculated. In processing these reception points, an algorithm is used to simplify the characteristics of the broken line that connects the edge candidate points Pn in order as described above, and one or more of the edge candidate points Pn are eliminated to determine a calculation position for calculating reception sensitivity from among the edge candidate points. Therefore, the number of reception point candidates Pm to be processed is also reduced. This makes it possible to provide an analysis device that can reduce the amount of calculation required to calculate a reception point where the reception sensitivity of radio waves transmitted from a reference point satisfies a standard.

The reception point determination unit 118 outputs the coordinates of the determined reception point P to the result processing unit 119 (step S115). The result processing unit 119 instructs the display unit 113 to output the coordinates of the determined reception point P. The display unit 113 outputs the coordinates of the determined reception point P to a display or the like. At this time, the display unit 113 may generate map information in which the positions of the reference point P1, the reception point P, etc. are plotted on a map based on the coordinates, and display the map information on a display or the like.

FIG. 9 is a diagram showing an outline of the processing performed by the analysis device.
Here, the analysis device 1 may further reduce the number of ridgeline candidate points Pn in the above-mentioned process and determine the calculation position for calculating the reception sensitivity from among the ridgeline candidate points. For example, after determining the calculation position in the above-mentioned step S107, the calculation position determination unit 117 compares the altitudes of adjacent ridgeline candidate points Pn for the ridgeline candidate points Pn identified as the calculation position. The calculation position determination unit 117 determines whether the difference in altitude between two adjacent ridgeline candidate points Pn is less than a predetermined threshold value that specifies that the altitudes are similar. If the difference in altitude between two adjacent ridgeline candidate points Pn is less than a predetermined threshold value, the calculation position determination unit 117 excludes the ridgeline candidate point Pn that is close to the reference point P1 from the calculation position. This further reduces the number of reception point candidates Pm to be processed. As a result, it is possible to provide an analysis device that can reduce the amount of calculation for calculating a reception point whose reception sensitivity of the radio wave transmitted from the reference point satisfies the standard. The example of FIG. 8 shows a case where edge candidate point Pn3 and edge candidate point Pn9 are further excluded from the calculated positions.

The above describes an embodiment of the present disclosure. According to the processing of the above-mentioned analysis device 1, it is possible to calculate the radio wave reachability range while ensuring the required accuracy while suppressing the amount of calculation. This makes it possible to shorten the calculation time and reduce resources such as memory required for the calculation. This is because the number of calculations of radio wave propagation loss, i.e., the number of edge points, performed when calculating the radio wave reachability range can be reduced to match the accuracy required by the user.

In the above explanation, only diffraction loss is considered as radio wave propagation loss, but other loss elements such as adjacent ridge loss and reflection loss may be considered and it may be determined in step S110 whether the sum of these losses is 0. In addition, the above process can be applied as a process for visualizing appropriate receiving points when visualizing topographical information using a computer, such as drawing a cross-sectional view of the topography.

FIG. 10 is a diagram showing another example of the configuration of the analysis device according to this embodiment.
FIG. 11 is a diagram showing a process flow of the analysis device shown in FIG.
The analysis device 1 includes at least a transmission distance calculation unit 115 , an edge line candidate point identification unit 116 , a calculation position determination unit 117 , and a reception point determination unit 118 .
The transmission distance calculation unit 115 calculates the transmission distance of the radio wave transmitted from the reference point (step S201).
The ridge candidate point identification unit 116 calculates virtual points plotted at a specified interval on a straight line in space to the initial reception point, which is the reference point plus the transmission distance, and identifies ridge candidate points indicating points on the ground surface that correspond to the virtual points (step S202).
The calculation position determination unit 117 uses an algorithm that simplifies the characteristics of the broken line that connects the edge candidate points in order from the reference point to the initial reception point, and determines a calculation position for calculating the reception sensitivity from among the edge candidate points by eliminating one or more of the edge candidate points (step S203).
The reception point determination unit 118 calculates the reception sensitivity at each calculated position, starting from the calculated position furthest from the reference point, and determines the radio wave reception point at the calculated position furthest from the reference point that satisfies the reference reception sensitivity (step S204).

(Hardware configuration)
FIG. 12 is a block diagram illustrating an example of a hardware configuration of a calculation processing device 20 capable of realizing the analysis device 1 according to each embodiment of the present disclosure.
An example of the configuration of hardware resources for implementing the analysis device 1 using one calculation processing device (information processing device, computer) will be described. However, the analysis device 1 may be physically or functionally implemented using at least two calculation processing devices. Furthermore, the analysis device 1 may be implemented as a dedicated device.

The computing device 20 has a central processing unit (Central_Processing_Unit, hereafter referred to as "CPU") 21, a volatile storage device 22, a disk 23, a non-volatile recording medium 24, and a communication interface (hereafter referred to as "communication IF") 27. The computing device 20 may be connectable to an input device 25 and an output device 26. The computing device 20 can send and receive information with other computing devices and communication devices via the communication IF 27.

The non-volatile recording medium 24 is a computer-readable medium, for example, a compact disc (Compact_Disc) or a digital versatile disc (Digital_Versatile_Disc). The non-volatile recording medium 24 may also be a universal serial bus memory (USB memory), a solid state drive (Solid_State_Drive), or the like. The non-volatile recording medium 24 holds the relevant program even without supplying power, making it possible to carry it around. The non-volatile recording medium 24 is not limited to the above-mentioned medium. Instead of the non-volatile recording medium 24, the relevant program may also be carried around via the communication IF 27 and a communication network.
The volatile storage device 22 is computer-readable and can temporarily store data. The volatile storage device 22 is a memory such as a dynamic random access memory (DRAM) or a static random access memory (SRAM).

That is, when executing a software program (computer program: hereinafter simply referred to as a "program") stored in the disk 23, the CPU 21 copies the program to the volatile storage device 22 and executes the arithmetic processing. The CPU 21 reads data necessary for executing the program from the volatile storage device 22. When display is required, the CPU 21 displays the output result on the output device 26. When inputting a program from the outside, the CPU 21 reads the program from the input device 25. The CPU 21 interprets and executes an analysis program (FIG. 2 or FIG. 11) in the volatile storage device 22 that corresponds to the function (processing) represented by each part shown in FIG. 1 or FIG. 10. The CPU 21 executes the processing described in each embodiment of the present disclosure above. That is, in such a case, each embodiment of the present disclosure can be considered to be possible by the analysis program. Furthermore, each embodiment of the present disclosure can be considered to be possible by a computer-readable non-volatile recording medium in which the analysis program is recorded.

The present disclosure has been described above using the above-mentioned embodiment as an exemplary example. However, the present disclosure is not limited to the above-mentioned embodiment. In other words, the present disclosure can be applied in various aspects that a person skilled in the art can understand within the scope of the present disclosure.

This application claims priority based on Japanese Patent Application No. 2022-002993, filed on January 12, 2022, the disclosure of which is incorporated herein in its entirety.

This disclosure may be applied to an analysis device, an analysis method, and a recording medium.

1 Analysis device 111 Storage unit 112 Input unit 113 Display unit 114 Control unit 115 Transmission distance calculation unit 116 Edge line candidate point identification unit 117 Calculated position determination unit 118 Reception point determination unit 119 Result processing unit

Claims (6)

A transmission distance calculation means for calculating a transmission distance of a radio wave transmitted from a reference point;
a candidate point specifying means for plotting a plurality of virtual points spaced apart from one another at a predetermined interval on a straight line in space from the reference point to an initial reception point spaced apart from the reference point by the transmission distance, and specifying a plurality of edge candidate points indicating points on the earth's surface corresponding to the plurality of virtual points;
a calculation position determination means for reducing one or more edge line candidate points from the plurality of edge line candidate points by using an algorithm for simplifying the characteristics of a broken line formed by sequentially connecting the plurality of edge line candidate points;
a reception point determination means for calculating reception sensitivities at positions corresponding to the plurality of ridgeline candidate points other than the one or more reduced ridgeline candidate points, in order from the ridgeline candidate point furthest from the reference point, and determining, as a reception point for the radio wave, the ridgeline candidate point furthest from the reference point among the ridgeline candidate points whose calculated reception sensitivities at the corresponding positions satisfy a reference reception sensitivity;
An analysis device comprising: The analysis device according to claim 1 , wherein the calculated position determination means, in order to reduce the one or more ridgeline candidate points, deletes the ridgeline candidate point that is closer to the reference point out of the two adjacent ridgeline candidate points when a difference in altitude between the two adjacent ridgeline candidate points is less than a predetermined value. 3. The analysis device according to claim 1, wherein the reception point determination means identifies a diffraction point at which the ground surface is a peak based on the altitude relationship between adjacent ridgeline candidate points among the plurality of ridgeline candidate points, calculates a diffraction path of the radio wave based on the reference point, the diffraction point, and at least one of the plurality of ridgeline candidate points other than the one or more reduced ridgeline candidate points, and calculates the reception sensitivity of the diffraction path using the diffraction loss in the diffraction path. 4. The analysis device according to claim 3 , wherein the calculated position determining means uses a Ramer-Douglas-Peucker algorithm as an algorithm for simplifying the characteristics of the polygonal line. Calculate the transmission distance of radio waves transmitted from the reference point,
Plotting a plurality of imaginary points spaced apart from each other at a predetermined interval on a straight line in space from the reference point to an initial reception point spaced apart from the reference point by the transmission distance;
identifying a plurality of edge candidate points indicating points on the ground surface corresponding to the plurality of virtual points, respectively;
reducing one or more edge candidate points from the plurality of edge candidate points using an algorithm that simplifies the characteristics of a broken line formed by sequentially connecting the plurality of edge candidate points;
calculating reception sensitivities at positions corresponding to the edge line candidate points from among the plurality of edge line candidate points other than the one or more reduced edge line candidate points, in order from the edge line candidate point furthest from the reference point;
determining, as the receiving point of the radio wave, the edge candidate point farthest from the reference point among the edge candidate points whose calculated receiving sensitivity at the corresponding position satisfies a reference receiving sensitivity. The computer of the analysis device
Calculate the transmission distance of radio waves transmitted from the reference point,
Plotting a plurality of imaginary points spaced apart from each other at a predetermined interval on a straight line in space from the reference point to an initial reception point spaced apart from the reference point by the transmission distance;
identifying a plurality of edge candidate points indicating points on the ground surface corresponding to the plurality of virtual points, respectively;
reducing one or more edge candidate points from the plurality of edge candidate points using an algorithm that simplifies the characteristics of a broken line formed by sequentially connecting the plurality of edge candidate points;
calculating reception sensitivities at positions corresponding to the edge line candidate points from among the plurality of edge line candidate points other than the one or more reduced edge line candidate points, in order from the edge line candidate point furthest from the reference point;
determining, as a receiving point of the radio wave, the edge candidate point farthest from the reference point among the edge candidate points whose calculated receiving sensitivity at the corresponding position satisfies a reference receiving sensitivity;
A program to make it happen .

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