JP3996098B2 - Radio wave propagation simulator and radio wave intensity calculation method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio wave propagation simulator for simulating the state of radio waves propagating in an indoor or outdoor space.
[0002]
[Prior art]
As a radio wave propagation simulator for simulating a radio wave propagation state, for example, a radio wave propagation simulation apparatus described in Patent Document 1 is known. This radio wave propagation simulation apparatus includes reference value calculation means for calculating a reference value of radio field intensity at an observation point, correction value storage means for storing a correction value of radio field intensity at the observation point, and an actual value of radio field intensity at the observation point. Actual measurement value storage means for storing is provided. When the actual value of the radio field intensity at the observation point exists in the actual value storage unit, the radio field intensity reference value calculated by the reference value calculation unit is corrected based on the actual measurement value at the observation point. On the other hand, when there is no actual measurement value, the estimated value of the radio field intensity is calculated by correcting the reference value of the radio field intensity calculated by the reference value calculation unit with the correction value of the observation point stored in the correction value storage unit. Estimated value calculation means is provided.
[0003]
[Patent Document 1]
Japanese Patent No. 3263191 (paragraph 0005, FIG. 1)
[0004]
[Problems to be solved by the invention]
In the radio wave propagation simulation apparatus described above, it is assumed that the calculation formula representing the attenuation of the radio wave intensity corresponding to the antenna performance such as the efficiency and directivity of the antenna that transmits and receives radio waves and the distance from the transmission antenna is known in advance. It has become. Examples of the calculation formula include a calculation formula for the radiated electromagnetic field derived from the Maxwell equation and a calculation formula based on the Okumura curve.
[0005]
However, when using an antenna whose performance is unclear, or when the calculation formula cannot be used due to the frequency of the radio wave or the structure of the space where the radio wave propagates, the simulation accuracy at locations other than the point where the actual measurement value was obtained decreases There is a problem of doing. Examples where the above formula cannot be used include the case where the distance between the transmission source and the reception point is approximately the same as the wavelength of the radio wave or shorter than the wavelength of the radio wave, or the antenna structure used for transmission / reception is complicated and has performance such as directivity and efficiency. This includes cases where analysis is not possible.
[0006]
An object of the present invention is to provide a radio wave propagation simulator capable of preventing a decrease in simulation accuracy even when a conventional calculation formula cannot be used in view of the problems of the prior art.
[0007]
[Means for Solving the Problems]
The present invention that achieves the above object provides a plurality of calculation formulas for calculating the radio wave intensity in a radio wave propagation simulator that simulates the state of the radio wave propagating in the space from the radio wave intensity of the space between the radio wave transmission source and the receiving antenna. A calculation formula setting unit that sets the parameter so as to be selectable, a parameter setting unit that sets a part of the parameters in the calculation formula to be changeable, and the radio wave intensity is calculated based on the set calculation formula and the set parameter. Radio wave intensity calculation means, measurement value input means for inputting an actual measurement value of the radio field intensity in a part of the space, calculation result for comparing the radio wave intensity by the radio wave intensity calculation means and the actual measurement value by the actual measurement value input means Comparing means is provided, and the calculation formula or the parameter is optimized based on the result of the comparison.
[0008]
Further, when there are a plurality of radio wave transmission sources, a radio wave intensity calculation device including the calculation formula setting means, the parameter setting means, and the radio wave intensity calculation means is provided for each transmission source, and the radio wave intensity of each radio wave intensity calculation device is determined. After the synthesis, the operation result comparison means performs comparison.
[0009]
Next, the operation of the present invention will be described. The parameter required for the calculation of the radio wave intensity is set in the parameter setting means, the calculation formula required for the calculation of the radio wave intensity is set in the calculation formula setting means, and the radio wave intensity calculation means sets the radio wave intensity based on the parameter and the calculation formula. Is calculated. If there is an actual value of the radio field intensity, the actual value is input from the actual value input means.
[0010]
When the actual measurement value is not input, the calculation result comparison unit does not compare the calculation result from the radio wave intensity calculation unit with the actual measurement value, and sends the calculation result to the calculation result output unit. The calculation result is output.
[0011]
When the actual measurement value is input, the calculation result comparison unit compares the calculation result from the radio wave intensity calculation unit with the actual measurement value, and the difference between the calculation result and the actual measurement value exceeds the reference value. For example, part or all of the setting parameters are reset in the parameter setting means, or the calculation formula set in the calculation formula setting means is reset, and the radio wave intensity calculation means recalculates the radio wave intensity again. The calculation result comparison means compares the result of the recalculation from the radio wave intensity calculation means with the actually measured value.
[0012]
Thereafter, in the same manner, until the difference between the recalculation result and the actual measurement value becomes equal to or less than the reference value, the parameter is reset or the calculation formula is reset and the recalculation is repeated. After the difference between the recalculation result and the actual measurement value is less than a certain value, the radio wave propagation simulator is optimized using the parameters and calculation formulas set at that time, so the actual measurement value was obtained. Calculate the radio field intensity at locations other than the location. Note that the above-mentioned radio wave intensity indicates, for example, electric field intensity, radio wave reception power, and the like.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is a radio wave propagation simulator for simulating the state of radio waves propagating in the space from the radio wave intensity of the space between the radio wave transmission source and the receiving antenna. Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
FIG. 1 shows a configuration of a radio wave propagation simulator according to the first embodiment. The radio wave propagation simulator includes an arithmetic device and a storage device which will be described later.
[0015]
The radio wave propagation simulator includes parameter setting means 1 for setting parameters necessary for the calculation of the radio field intensity, calculation formula setting means 2 for setting a calculation formula necessary for the calculation of the radio field intensity, and actual measurement for inputting the actual measurement value of the radio field intensity. It has value input means 3. Also, the radio wave intensity calculating means 4 for calculating the radio wave intensity based on the information set in the parameter setting means 1 and the calculation formula setting means 2, the calculation result by the radio wave intensity calculating means 4 and the actual value input from the input means 3. Computation result comparison means 5 for comparing actual measurement values is provided. Furthermore, it has a calculation result output means 6 for outputting the calculation result of the radio wave intensity calculation means 4 based on the comparison result by the calculation result comparison means 5. Based on the difference between the calculation result and the actual measurement value, the calculation result comparison unit 5 determines whether to instruct parameter resetting or calculation formula resetting or to output the calculation result.
[0016]
When the actual measurement value is not input to the actual measurement value input unit 3, the calculation result comparison unit 5 does not compare the calculation result from the radio wave intensity calculation unit 4, and the calculation result output unit 6 has the radio field intensity calculation unit 4. The calculation result from is output as it is.
[0017]
The calculation formula setting means 2 is used by the calculation formula input means 21 for inputting the calculation formula, the plurality of calculation formula storage means 22 for storing the input calculation formula, and the radio wave intensity calculation means 4 from the plurality of calculation formulas. It is comprised from the calculation formula selection means 23 which selects a calculation formula. In the present embodiment, the calculation formula selection unit 23 selects a calculation formula based on the distance from the transmission source to the reception point.
[0018]
Next, the operation of this embodiment will be described. FIG. 2 is a flowchart showing the processing procedure of the radio wave propagation simulator. A parameter required for the calculation of the radio wave intensity is set from the parameter setting means 1 (9001), and a calculation formula required for the calculation of the radio wave intensity is set from the calculation formula setting means 2 (9002). Next, the presence / absence of an actually measured value of the radio wave intensity is checked (9003). If there is an actually measured value, the actually measured value is fetched from the actually measured value input means 3 (9006). Then, the radio wave intensity calculation means 4 calculates the radio wave intensity based on the parameter and the calculation formula (9007).
[0019]
The calculation formula setting means 2 associates the distance from the transmission source to the reception point with the calculation formula, and the radio wave intensity calculation means 4 selects the calculation formula according to the distance from the transmission source to the reception point (9015). ), The radio wave intensity is calculated by the calculation formula (9016), and 9015 and 9016 are repeated until the calculation of all points is completed (9017).
[0020]
On the other hand, when the actual measurement value is not inputted, when the radio wave intensity calculation means 4 performs the calculation of the radio wave intensity (9015-9017), the calculation result comparison means 5 sends the calculation result to the calculation result output means 6, and the calculation result The output means 6 outputs the calculation result (9012).
[0021]
When the calculation of the radio field intensity is completed when the actual measurement value is input, the calculation result comparison unit 5 compares the calculation result from the radio field intensity calculation unit 4 with the actual measurement value (9008). The comparison here uses, for example, the difference between each actually measured value and the corresponding calculation result. Specifically, the square value of the difference between the square values is calculated by calculating the square value of the difference. Is used. Then, part or all of the setting parameters are reset in the parameter setting unit 1 or the calculation formula setting unit 2 so that the root mean square value of the difference between the calculation result and the actual measurement value is minimized or less than the reference value. The calculation formula is reset at (9010). Then, the radio wave intensity calculation means 4 recalculates the radio wave intensity again, and the calculation result comparison means 5 compares the recalculation result from the radio wave intensity calculation means 4 with the actually measured value.
[0022]
Thereafter, in the same manner, until the mean square value of the difference between the recalculation result and the actual measurement value is minimum or below the reference value, the parameter is reset or the calculation formula is reset and the recalculation is repeated. The calculation result is output from the calculation result output means 6 (9012).
[0023]
FIG. 3 shows an example of a parameter setting screen in the parameter setting means. The setting items include information 1001 on a reflection object such as a wall existing in a space where radio waves propagate, radio wave frequency and transmission power to be transmitted, radio wave transmission source information 1002 such as radio wave transmission source position and antenna efficiency, radio wave reception This is information 1003 of the point movement range (measurement range).
[0024]
In the information 1001, the coordinates of three points are designated as a method for specifying the position of a reflector (a plane such as a wall), and one plane passing through the three points is defined. For example, each wall, floor, or ceiling has three points, and each point is defined by x, y, and z coordinates. In addition, the relative permittivity, relative permeability, and conductivity of each surface are also set.
[0025]
In the information 1002, the transmission frequency, transmission power, position coordinates of the transmission source, and transmission antenna efficiency are set. A parameter for resetting the value may be designated in advance in case the parameter needs to be reset according to the comparison result between the calculation result and the actual measurement value. In the present embodiment, the transmission antenna efficiency Gt is set as a parameter.
[0026]
In the information 1003, the start point and end point of the position of the reception point, and the number of measurement points (radio intensity calculation position) are set. Here, 201 measurement points are set for the measurement range from x = 0 to x = 50 m.
[0027]
FIG. 4 shows an example of a calculation formula setting screen in the calculation formula setting means. In FIG. 4, candidates for calculation formulas suitable for the radio wave propagation space to be simulated are selected from a plurality of calculation formulas, and the usage conditions for each selected calculation formula are input. Here, an example is shown in which three calculation formulas are selectively used depending on the distance d from the transmission source to the reception point and the value of the wavelength λ of the transmission radio wave as the use conditions of the calculation formulas. In addition, as a user-specified formula, the simulator operator can directly input a calculation formula.
[0028]
The calculation formula (1) in FIG. 4 represents the received power at the reception point when the distance between the radio wave transmission source and the reception point is sufficiently large with respect to the wavelength λ. The calculation formula (2) represents the received power at the reception point according to an expression approximately derived from the Maxwell equation, and the calculation formula (3) represents the received power at the reception point according to an empirical formula designated by the user. These calculation formulas are automatically selected according to the use conditions which are a function of the distance d from the transmission source.
[0029]
In the above formula, Wr is the received power, d is the distance between the radio wave transmission source and the reception point, Po is the transmission power, Gt is the efficiency of the transmitting antenna, k is the wave number, εo is the dielectric constant in vacuum, and εr is The relative dielectric constant, θ, represents the angle between the z-axis and the line segment connecting the radio wave transmission source and the reception point in the polar coordinate system.
Next, calculation examples according to the present embodiment will be shown. Here, for each usage condition, the calculation formula given as a candidate is reset, the optimal calculation formula for the usage condition is selected, and then the transmission antenna efficiency Gt, which is a setting parameter, is reset. An example of calculation is shown.
[0030]
First, an optimal calculation formula when the use condition is “d <λ” is selected from calculation formula candidates. According to FIG. 4, the calculation formula candidates under the use condition “d <λ” are the calculation formula (2) and the calculation formula (3). First, calculation is performed according to the calculation formula (2), and the calculation result is shown in FIG. Next, the calculation formula is reset to the calculation formula (3), the calculation is performed, and the calculation result is shown in FIG. The mean square value of the difference between the calculated values 6701 and 6801 of the solid line in FIG. 22 and FIG. 23 and the actually measured value 6710 of Δ is calculated, and the square mean value is the smallest in the smaller one, that is, the candidate formula. The calculated calculation formula (3) is determined as an optimal calculation formula for the use condition “d <λ”.
[0031]
Note that a method of selecting a calculation formula in which the mean square value is a reference value (for example, 10 −6) or less may be used. However, as a method for selecting one of a plurality of formulas, the mean square value is the smallest. The method of selecting the calculation formula that minimizes the mean square value will be described below.
[0032]
The calculation formula is determined in the same procedure under other use conditions. As a result, the calculation formula (2) is optimal under the use condition “λ ≦ d <10λ”, and the calculation formula (1) is optimal under the use condition “10λ ≦ d”. 5 and the result of connecting them is assumed to be FIG. However, when connecting the graphs of the respective calculation formulas, the coefficients of the respective calculation formulas are adjusted so that the graphs are continuous at a joint such as d = λ and d = 10λ.
[0033]
Next, the parameters are optimized. FIG. 5 shows the result of calculation according to the use conditions shown in FIG. 4 for the setting parameter (Gt = 0) shown in FIG. The horizontal axis of the graph 6000 in FIG. 5 represents the distance from the transmission source to the reception point, and the vertical axis represents the radio wave intensity (reception power here).
[0034]
In order to further reduce the mean square value of the difference between the calculated value 6001 of the solid line and the actually measured value 6010 of Δ, the transmission antenna efficiency Gt is decreased, for example, the value is decremented by 1, and the recalculation is repeated.
[0035]
FIG. 6 shows the calculation result when the re-calculation is repeated while the transmission antenna efficiency Gt is decreased and the mean square value is minimized. At this time, if Gt = −33, it is determined that the efficiency of the transmission antenna used here is −33 dB, and this is set to the optimum value. Then, the radio wave intensity at other points (points 40 m or more away from the radio wave transmission source where there is no actual measurement value in FIG. 6) is calculated using this transmission antenna efficiency (Gt = −33).
[0036]
Here, hardware for realizing each unit shown in FIG. 1 will be described. FIG. 21 shows hardware of the radio wave propagation simulator. The parameter setting unit 1, calculation formula setting unit 2, and actual value input unit 3 in FIG. 1 are realized by a keyboard 8001 and a disk drive 8005. The calculation formula storage means 22 in FIG. 1 and the measured value input means 3, the means for storing the input measured values, the means for storing the input parameters included in the parameter setting means 1, This is realized by the storage device 8002 or the disk drive 8005. Further, the calculation formula selection means 23, the radio wave intensity calculation means 4 and the calculation result comparison means 5 in FIG. 1 are realized by a calculation device 8000, and the calculation result output device 6 in FIG. 1 is realized by a display 8003, a printer 8004, and a disk drive 8005. .
[0037]
Moreover, it is also possible to implement | achieve using other computers or calculation apparatuses, such as a large computer and the arithmetic unit incorporated in the measuring device.
[0038]
According to the first embodiment, the calculation formula can be selected according to the distance between the transmission source and the reception point, and the antenna parameters whose performance is unknown can be varied. Therefore, there is wide applicability. In addition, since the difference between the obtained radio wave intensity and the actual value is minimized, the radio wave intensity with high accuracy can be obtained.
[0039]
In the above-described first embodiment, as shown in FIG. 4, a plurality of calculation formulas are properly used depending on the use conditions. On the other hand, the range of the distance d between the transmission source and the reception point is narrow, and the calculation of all sections may be performed by the same calculation formula without dividing conditions. Therefore, a second embodiment in which calculation is performed with the same calculation formula in the entire range in which the reception point moves will be described. The second embodiment is a limited case of the first embodiment.
[0040]
FIG. 7 shows the configuration of a radio wave propagation simulator according to the second embodiment. Other than the calculation formula selection means 231 is the same as FIG. The difference is that the calculation formula selection means 231 has a function of selecting one calculation formula to be used from a plurality of calculation formulas. The parameter setting screen in the parameter setting means 1 in this embodiment is the same as that in FIG.
[0041]
FIG. 8 is a flowchart showing a processing procedure according to the second embodiment. Although it is almost the same as FIG. 2, in FIG. 8, there is no procedure (9015) for selecting a calculation formula according to the distance between transmission and reception points. The calculation (9057) of the radio wave intensity repeats the calculation (9016) based on the selected calculation formula until the calculation of all points is completed (9017).
[0042]
FIG. 9 shows an example of a calculation formula setting screen according to the second embodiment. Each calculation formula is the same as in FIG. However, in FIG. 9, the user designates a calculation formula candidate suitable for the radio wave propagation space to be simulated from a plurality of calculation formulas prepared. In FIG. 9, calculation formulas (1), (2), and (3) are selected as candidates. Similarly to FIG. 4, the simulator operator may directly input the calculation formula.
[0043]
Next, a calculation example in the second embodiment is shown. However, in this embodiment, the transmission antenna efficiency Gt, which is a setting parameter, is already determined in the same procedure as in the first embodiment (for example, Gt = −33), and convergence calculation is performed while resetting the calculation formula. Here are some examples.
[0044]
FIG. 10 shows a result 6500 calculated using the calculation formula (1) selected in FIG. In the graph, the horizontal axis of the graph 6500 represents the distance from the transmission source to the reception point, and the vertical axis represents the radio wave intensity (reception power in the present embodiment). Based on this calculation result, the root mean square value of the difference between the calculated value 6501 of the solid line and the actually measured value 6510 of Δ is obtained. Next, another calculation formula candidate (2) is reset and the same calculation is performed, and the root mean square value of the difference between the calculated value and the actually measured value is obtained. Further, the same calculation is performed for the calculation formula candidate (3) to obtain the mean square value of the difference between the calculated value and the actually measured value.
[0045]
As a result, it is assumed that the calculated value 6601 of FIG. 11 is obtained when the calculation formula (2) is used, and the mean square value of the difference between the calculated value 6601 and the actually measured value 6510 is minimized. As a result, the calculation formula to be used in this embodiment is determined to be optimal (2), and the radio wave intensity at other points is also calculated using the calculation formula (2).
[0046]
Next, a third embodiment in which an approximate curve is derived from actual measurement values and the approximate curve is used as a calculation formula will be described.
[0047]
FIG. 12 shows the configuration of a radio wave propagation simulator according to the third embodiment. In this configuration, approximate curve deriving means 7 for deriving an approximate curve based on the actual measurement value input to the actual measurement value input means 3 is provided. The approximate curve derived by the approximate curve deriving means 7 is output to the calculation formula setting means 2 and added as one of the calculation formulas selected by the calculation formula setting means 2.
[0048]
As a method for deriving an approximate curve from an actual measurement value, for example, a regression analysis method or the like can be cited. The order of the approximate curve is determined in advance, and regression analysis is used to determine the coefficient of each term. FIG. 13 shows an example in which an approximate curve is derived from actual measurement values. In the graph 6900, the order of the approximate curve is determined to be fifth, and the approximate curve obtained from the actual measurement value 6910 is 6901.
[0049]
FIG. 14 shows an example of a calculation formula setting screen according to the third embodiment. In FIG. 14, the calculated approximate curve (3) is listed as a candidate for selecting a calculation formula.
[0050]
According to the third embodiment, since the approximate curve is derived based on the actually measured value, an approximate expression based on the actually measured value can be obtained even when there is no appropriate calculation formula, which reduces the simulation accuracy. Can be prevented.
[0051]
Next, as a fourth embodiment, a method of applying the present invention when estimating the influence of radio waves transmitted from a plurality of transmission sources will be described.
[0052]
FIG. 15 shows the configuration of a radio wave propagation simulator according to the fourth embodiment. The difference from the first embodiment is that a radio wave intensity calculation device 91 including a parameter setting unit 1, a calculation formula setting unit 2 and a radio wave intensity calculation unit 4 is provided corresponding to the transmission source. The calculation result combining means 8 combines the radio wave intensities of
[0053]
FIG. 16 shows the operation of the fourth embodiment. FIG. 16 differs from the first embodiment (FIG. 2) in that radio wave intensity calculation (9007) is performed for each transmission source, and the calculation results are combined (9071).
[0054]
An example of the calculation formula setting screen in each calculation formula setting means 2 is the same as that of FIG. 4 of the first embodiment or FIG. 9 of the second embodiment. 4 or 9 is present.
[0055]
FIG. 17 shows an example of a parameter setting screen in the parameter setting means. Reflector information 1001 and radio wave reception point movement range information 1003 are the same as those in FIG. 3 of the first embodiment. However, the radio wave transmission source information 1302 is set for each transmission source.
[0056]
In the fourth embodiment, the radio wave transmission source information 1302 is a parameter for resetting the phase offset in addition to the transmission antenna efficiency. The phase offset is the initial phase of the radio wave transmitted from the transmission source. In addition, it is assumed that the calculation formula uses a method (same as in the first embodiment) which is selectively used according to the distance between the transmission source and the reception point.
[0057]
In the present embodiment, the calculation formula for each use condition of each transmission source is already determined by the same method as in the first embodiment, and only the setting parameter determination will be described below.
[0058]
FIG. 18 shows a calculation example in the fourth embodiment. Calculations are made with the transmission antenna efficiencies of all transmission sources set to 0 and the phase offsets set to 0, and the calculation results from all the transmission sources are combined. The solid line is the calculated value 6201 and the Δ mark is the measured value 6210.
[0059]
From the state shown in FIG. 18, first, the transmission antenna efficiency is incremented by 1 independently for each transmission source, or is decremented by 1 to change so that the root mean square value of the difference between the measured value and the calculated value of the synthesized wave is minimized. Determine the antenna efficiency combination. FIG. 19 shows the result in which the mean square value is minimized. Specifically, the transmission source No. 1, No. 1 2, No. 3 transmit antenna efficiencies are −33, −43, and −43, respectively.
[0060]
In FIG. 19, the solid line is the calculated value 6301 of the combined wave, and the Δ mark is the actually measured value 6210 of the combined wave. From this state, the phase offset is incremented and incremented by 1 degree for each transmission source or decremented by 1 degree, and the root mean square value of the difference between the measured value of the synthesized wave and the calculated value of the synthesized wave is minimized. Determine the phase offset combination.
[0061]
FIG. 20 shows a calculation example when the root mean square value is minimized in the fourth embodiment. The solid line is the calculated value 6401 of the combined wave, and the Δ mark is the actually measured value 6210 of the combined wave. Transmission source No. 1, No. 1 2, No. The phase offsets of 3 are −90 degrees, 0 degrees, and 0 degrees, respectively.
[0062]
According to the fourth embodiment, with respect to a composite wave of radio waves transmitted from a plurality of transmission sources, an actual measurement value of the composite wave and calculation of the composite wave are reset while resetting parameters and calculation formulas independently for each transmission source. It is possible to calculate the radio wave intensity at which the mean square value of the difference in values is minimized, and to simulate radio wave propagation by a plurality of transmission sources.
[0063]
【The invention's effect】
According to the present invention, a calculation formula can be selected according to the distance between a transmission source and a reception point, and an antenna parameter whose performance is unknown can be varied. Therefore, a radio wave propagation simulator with wide applicability can be provided. In addition, since the difference between the calculated radio wave intensity and the actually measured value is minimized, the accuracy of the radio wave intensity can be improved. In addition, radio wave propagation by a plurality of transmission sources can be simulated.
[0064]
In addition, since an approximate expression based on actual measurement values can be derived or a user-specified calculation expression can be used, when using an antenna with unclear performance, or depending on the frequency of radio waves or the structure of the space in which radio waves propagate, Even when the calculation formula cannot be used, it is possible to prevent a decrease in simulation accuracy.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a radio wave propagation simulator according to a first embodiment of the present invention.
FIG. 2 is a flowchart showing the operation of the radio wave propagation simulator according to the first embodiment.
FIG. 3 is an explanatory diagram showing an example of a parameter setting screen according to the first embodiment.
FIG. 4 is an explanatory diagram illustrating an example of a calculation formula setting screen according to the first embodiment.
FIG. 5 is a graph showing an example of a calculation result according to the first embodiment.
FIG. 6 is a graph showing an example of converged calculation results according to the first embodiment.
FIG. 7 is a block diagram showing a configuration of a radio wave propagation simulator according to a second embodiment of the present invention.
FIG. 8 is a flowchart showing the operation of the radio wave propagation simulator according to the second embodiment.
FIG. 9 is an explanatory diagram showing an example of a calculation formula setting screen according to the second embodiment.
FIG. 10 is a graph showing an example of a calculation result according to the second embodiment.
FIG. 11 is a graph showing an example of converged calculation results according to the second embodiment.
FIG. 12 is a block diagram showing a configuration of a radio wave propagation simulator according to a third embodiment of the present invention.
FIG. 13 is an explanatory diagram showing an example of derivation of an approximate curve according to the third embodiment.
FIG. 14 is an explanatory diagram showing an example of a calculation formula setting screen according to the third embodiment.
FIG. 15 is a block diagram showing a configuration of a radio wave propagation simulator according to a fourth embodiment of the present invention.
FIG. 16 is a flowchart showing the operation of the radio wave propagation simulator according to the fourth embodiment.
FIG. 17 is an explanatory diagram showing an example of a parameter setting screen according to the fourth embodiment.
FIG. 18 is a graph showing an example of a calculation result according to the fourth embodiment.
FIG. 19 is a graph showing an example of calculation results during convergence according to the fourth embodiment.
FIG. 20 is a graph showing an example of converged calculation results according to the fourth embodiment.
FIG. 21 is a hardware configuration diagram of a radio wave propagation simulator according to the first embodiment of the present invention.
FIG. 22 is a graph showing an example of a calculation result according to the calculation formula (2) in the first embodiment.
FIG. 23 is a graph showing an example of a recalculation result based on the calculation formula (3) in the first embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Parameter setting means, 2 ... Calculation formula setting means, 21 ... Calculation formula input means, 22 ... Calculation formula storage means, 23,231 ... Calculation formula selection means, 3 ... Actual value input means, 4 ... Radio wave intensity calculation means, DESCRIPTION OF SYMBOLS 5 ... Calculation result comparison means, 6 ... Calculation result output means, 7 ... Approximation curve derivation means, 8 ... Calculation result synthesis means, 91 ... Radio wave intensity calculation apparatus, 8000 ... Calculation apparatus, 8001 ... Keyboard, 8002 ... Storage apparatus, 8003 ... display, 8004 ... printer, 8005 ... disk drive.

Claims (8)

In the radio wave propagation simulator that simulates the state of the radio wave propagating in the space from the radio wave intensity of the space between the radio wave transmission source and the receiving antenna,
A calculation formula setting means for setting a plurality of calculation formulas for calculating the radio field intensity to be selectable, a parameter setting means for setting a part of parameters in the calculation formula to be changeable, and a set calculation formula. Radio wave intensity calculating means for calculating the radio wave intensity based on parameters, actual value input means for inputting an actual value of the radio wave intensity in a part of the space, and input of the radio wave intensity and the actual value by the radio wave intensity calculating means A radio wave propagation simulator characterized by comprising a calculation result comparison means for comparing with an actual measurement value by means, and optimizing the calculation formula or the parameter based on the result of the comparison. In the radio wave propagation simulator that simulates the state of the radio wave propagating in the space from the radio wave intensity of the space between the plurality of radio wave transmission sources and the receiving antenna,
A calculation formula setting means for setting a plurality of calculation formulas for calculating the radio field intensity to be selectable, a parameter setting means for setting a part of parameters in the calculation formula to be changeable, and a set calculation formula. A radio wave intensity calculating device for each transmission source, including radio wave intensity calculating means for calculating the radio wave intensity based on a parameter;
A calculation result combining means for combining the radio field intensity by each radio field intensity calculation device; an actual measurement value input means for inputting an actual measurement value of the radio field intensity in a part of the space;
Computation result comparison means for comparing the radio wave intensity by the computation result synthesis means with the actual measurement value by the actual measurement value input means is provided, and the calculation formula or the parameter is optimized based on the comparison result. Radio wave propagation simulator. In claim 1 or 2,
The calculation result comparison means changes the calculation formula or the parameter setting so that a difference between the radio wave intensity and the measured value is a minimum or a reference value or less. In claim 1 or 2,
The radio wave propagation simulator characterized in that the calculation formula setting means selects a calculation formula to be set according to the relationship between the wavelength of a transmission radio wave and the distance between transmission and reception. In claim 1 or 2,
The radio wave propagation simulator characterized in that the calculation formula setting means is configured to be able to incorporate a user-specified formula into a part of the plurality of calculation formulas. In claim 1 or 2,
An radio wave propagation simulator characterized by comprising an approximate curve deriving means for deriving an approximate expression from the actual measurement value, and setting the derived approximate expression in the calculation formula setting means. In the radio wave intensity calculation method of the radio wave propagation simulator that simulates the state of the radio wave propagating through the space from the radio wave intensity of the space between the radio wave transmission source and the receiving antenna,
One calculation formula is selected from a plurality of calculation formulas for calculating the radio field intensity, and a changeable parameter value is set among the parameters in the calculation formula, and the radio wave is set based on the set calculation formula and parameters. Calculating the intensity, comparing the radio field intensity of the calculation result with the actual value of the radio field intensity in a part of the space, until the difference between the radio field intensity and the actual measurement value is a minimum or a reference value or less, A radio wave intensity calculation method for a radio wave propagation simulator, wherein the calculation formula is reset and the calculation of the radio wave intensity is repeated. In claim 7,
The radio wave intensity calculation method for the radio wave propagation simulator, wherein the calculation of the radio wave intensity is performed while selecting the calculation formula according to the distance between the radio wave transmission / reception points until the calculation of all points is completed.

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