JP3852843B2 - Radio wave reception point ambient environment determination device, radio wave reception point ambient environment determination method, and radio wave reception point ambient environment determination program - Google Patents

Description

  The present invention relates to a radio wave reception point ambient environment determination apparatus, a radio wave reception point ambient environment determination method, and a radio wave reception point ambient environment determination program that determine an environment at a radio wave reception point that receives a broadcast wave or the like.

Conventionally, it is well known that the environment around a radio wave transmission point and a radio wave reception point affects electric field strength in radio wave propagation such as communication and broadcasting.
For example, the electric field strength of a certain radio wave reception point can be freely determined if the radio wave transmission point position (longitude, latitude, elevation above sea level), radio wave reception point position (longitude, latitude, elevation above sea level), and transmission antenna pattern (horizontal, vertical) are determined. Although the spatial electric field strength can be calculated, the actual electric field strength must consider the propagation attenuation caused by the topography around the receiving point and the building.

  Therefore, the propagation attenuation is calculated after obtaining the average value of the ground height of 1 km square centered on the radio wave reception point according to Notification 640 of Article 7, Paragraph 4 of the Ministry of Posts and Telecommunications Radio Station License Procedure Rules. From the average value, extract the building structure that can be cut in the horizontal plane of 1km square centered on the radio wave reception point 10m above, and determine the radio wave reception point from the sum of the horizontal cross-sectional areas of the extracted building structure It is determined from the density of the building expressed as a percentage with respect to 1 km square as the center, whether the radio wave reception point is an urban area or a suburb, and the incident angle of the radio wave to the radio wave reception point.

However, in order to obtain the height of a 1 km square building structure centering on the radio wave reception point, a great amount of labor and cost are required, which is not practical.
Therefore, a technology that calculates and corrects the propagation attenuation during radio wave propagation using data that is relatively easy to obtain and has high reliability in consideration of the influence on the electric field strength caused by the surrounding environment. Has also been proposed (see, for example, Patent Document 1).

The technique disclosed in Patent Document 1 is to obtain the propagation attenuation amount of a radio wave reception point in radio wave propagation from the Geographical Survey Institute land use numerical map and the regional mesh statistical census data. Specifically, from the Geographical Survey Institute land use numerical map, after judging the land use situation on the radio wave transmission point side from the radio wave reception point and calculating the maximum attenuation of the building, the number of households based on the regional mesh statistics census data The maximum attenuation of the building is corrected by the above, and the corrected attenuation is further corrected in consideration of the incident angle of the radio wave to the radio reception point, and then the city attenuation is obtained by adding the Fresnel loss. . -
Japanese Patent No. 3403701 (paragraph numbers 0014 to 0045)

  By the way, in the calculation method of the propagation attenuation described above, only the influence on the electric field strength due to the presence of the building is considered, but the influence on the electric field strength differs depending on whether it is the seaside or inland besides the building ( ITU-R [International Telecommunication Union-Radio Communication Sector] Since it does not consider "International Telecommunication Union-Radio Communication Sector" Recommendation Series P (Radio Propagation). The sex was even lower.

  Even if the existence of a building is taken into account, the above-described method for calculating propagation attenuation calculates propagation attenuation at a radio wave reception point. In the case where they are different, there is a possibility that an error may occur in the maximum attenuation amount of the building as the correction reference value.

  In addition, if the propagation attenuation correction reference value can be recognized in a wide area in advance based on the direction of arrival of radio waves, the usage environment is clear, such as a vehicle navigation system and a ship navigation system. Therefore, it has been desired that the environment of the radio wave reception point can be uniquely determined by a numerical definition without being influenced by the geographical environment.

  Also, consider the necessity of installing a repeater between the radio wave transmission point and the radio wave reception point, and consider the installation location when it is necessary to install a repeater. If the environment and the correction reference value can be recognized, a general computer can be used rather than a high-performance, expensive computer that uses a complex calculation to determine the maximum building attenuation that will be the correction reference value. However, since it is possible to perform subsequent correction processing using a value calculated once in advance, it has been desired that the environment of the radio wave reception point can be uniquely determined by a numerical definition. Furthermore, it has been desired to improve the electric field calculation simulation by bringing the actually measured value at the radio wave reception point close to the calculated value on the desk.

  Then, at the radio wave reception point, for example, radio waves that can be received by an unexpected foreign radio wave may be disturbed. For this reason, it has been desired to take defense measures by predicting the state of radio waves from overseas at the radio wave reception point.

  The present invention was devised to solve the above-described problem, and the radio wave receiving point is numerically defined as a surrounding environment based on the direction of arrival of the radio wave with respect to the influence of the electric field strength at the radio wave receiving point from the radio wave transmitting point. It can be determined uniquely by definition, the reliability of electric field calculation simulation can be improved, interference waves can be predicted, and the correction reference value according to the surrounding environment of the radio wave reception point A radio wave reception point surrounding environment determination device that can improve versatility by making it possible to deal with various fields that use radio wave propagation, such as the setting of and the use of set correction reference values for various devices. It is an object to provide a reception point surrounding environment determination method and a radio wave reception point surrounding environment determination program.

  In order to achieve the object, the radio wave reception point surrounding environment determination device according to the present invention is configured as follows. That is, the radio wave reception point ambient environment determination device determines an ambient environment at the radio wave reception point to be determined, and includes an information input unit, a geographic database unit, a point setting unit, a point environment determination unit, and a reception point determination unit. And an output unit.

  With this configuration, the radio wave reception point surrounding environment determination device receives radio wave transmission points and radio wave reception points based on geographic information stored in the geographic database unit when position information regarding the radio wave transmission point and the radio wave reception point is input to the information input unit. The positions of the transmission point and radio wave reception point are confirmed. Then, the radio wave propagation line that connects the radio wave transmission point and the radio wave reception point in a straight line by referring to the position information input to the information input unit by the point setting unit and the geographical information read from the geographic database unit On the other hand, a plurality of determination points are set at a fixed distance and a fixed interval from the radio wave reception point. Furthermore, when the determination point is set, the environmental condition for each determination point is determined by the point environment determination unit based on the geographical information and the environment determination condition set in advance. In the radio wave reception point ambient environment determination device, the radio wave reception point is determined by the reception point determination unit based on the ratio of the environment of each determination point determined by the point environment determination unit and a preset ambient environment threshold value. The surrounding environment is uniquely determined by a numerical definition, and the result determined by the receiving point determination unit by the output unit is output to a display means such as a monitor and displayed.

  In areas where radio waves from overseas may be affected by radio wave reception points, the surrounding environment at the radio wave reception point is virtually determined from the point known as the radio wave transmission point, and the result is It is also possible to take measures based on this. The environment determination condition is a condition that can be uniquely determined as “1” (applied) or “0” (not applicable) for the set determination point. For example, is the altitude above sea level = 0 m? No, or whether it is a building site or not. Furthermore, the surrounding environment threshold is determined by an empirical rule or by performing a simulation for an area in which the surrounding environment of the radio wave reception point R from the radio wave transmission point T is known in advance. .

  In the radio wave reception point surrounding environment determination device, at least a radio wave transmission point and a location or latitude / longitude of the radio wave reception point are input as position information to the information input unit, and geographic information is input to the geographic database unit. The sea level altitude corresponding to the topographic map is stored, the environment judgment condition is determined by the sea level altitude, and the reception point judgment unit determines whether the surrounding environment of the radio wave reception point is a seaside area or an inland area. The gist of this is to determine.

  With this configuration, the radio wave reception point surrounding environment determination device uses the geographic database to determine whether the surrounding environment of the radio wave reception point is a seaside area or an inland area with the reception point determination unit. Accordingly, it is possible to calculate a correction coefficient or the like for appropriately causing a radio wave such as a broadcast wave to reach the radio wave reception point. Further, it can be changed according to the purpose of appropriately determining the state of the determination point uniquely determined by the numerical definition.

  Further, in the radio wave reception point surrounding environment determination device, when the surrounding environment of the radio wave reception point is determined to be three or more, the number of the surrounding environments is set to n, and the surrounding environment threshold value is obtained by n−1. A threshold setting unit that sets and sets the reception point determination unit based on the ambient environment threshold set by the threshold setting unit and the ratio of the environment of the determination point. The surrounding environment is judged.

  With this configuration, in the radio wave reception point surrounding environment determination device, when the value of n is set to 3, for example, by the threshold setting unit, the value obtained by n−1 is “2”, and the surrounding environment threshold is 2 The environment around the radio wave reception point is uniquely determined by the numerical definition based on the divided values.

In the radio wave reception point surrounding environment determination device, at least a radio wave transmission point and a location or latitude / longitude of the radio wave reception point are input as position information to the information input unit, and geographic information is input to the geographic database unit. The land use data corresponding to the topographic map and the land use data corresponding to the topographic map are stored at least, and the land use data as the geographical information stored in the geographic database unit is two types of building land or other than building land, The reception point determination unit is configured to determine whether the surrounding environment of the radio wave reception point is a suburban area, an urban area, or a large urban area.

  With this configuration, the radio wave reception point surrounding environment determination device can determine the three surrounding environments with the minimum data based on the land use data corresponding to the topographic map and the topographic map. In addition, when transmitting radio waves such as broadcast waves, it is possible to employ correction factors (correction factors when transmitting radio waves) that match the local environment, and to determine the transmission of radio waves that correspond to the local environment. it can.

Further, in the radio wave reception point peripheral environment determination device, the point setting unit sets a plurality of peripheral lines in a straight line at a predetermined angle of swing angle with respect to the radio wave propagation line as a center, and the periphery thereof. Each line has a configuration including a peripheral line setting unit that sets determination points at the same number and the same interval as the radio wave propagation lines.
By configuring in this manner, the radio wave reception point surrounding environment determination device sets the environment condition of the radio wave reception point as a surface state by setting a plurality of peripheral lines for the topographic state of the radio wave reception point, and further, The reception point determination unit comprehensively summarizes the surrounding environment of the radio wave reception point based on a ratio of the environment of the determination point obtained based on the environment determination condition set in advance and a surrounding environment threshold set in advance. Judgment.

  Furthermore, the radio wave reception point surrounding environment determination method according to the present invention is configured as follows to achieve the above object. That is, the radio wave reception point surrounding environment determination method includes an input step, a point setting step, a point environment determination step, a reception point determination step, and an output step.

  In this way, in the radio wave reception point surrounding environment determination method, first, the position information about the radio wave transmission point and the radio wave reception point is input in the input step, and the geographical information stored in advance is referred to in the point setting step. A plurality of determination points are set for a radio wave propagation line connecting the input radio wave transmission point and the radio wave reception point at a constant distance and a constant interval from the radio wave reception point. Further, in the point environment determination step, the environment of the determination point is further determined and received based on the geographical information of the determination point and the environment determination condition set in advance for determining the environment of the determination point. Through the point determination step, the surrounding environment of the radio wave reception point is determined based on the determined environment ratio of the determination point and a preset ambient environment threshold.

  In addition, the radio wave reception point surrounding environment determination program according to the present invention is configured as follows in order to achieve the above object. That is, the radio wave reception point surrounding environment determination program is based on the radio wave transmission point and the position information related to the radio wave reception point input by the information input means for inputting information, and the geographical information previously input in the geographic database, In order to determine the surrounding environment of the radio wave reception point, a computer is caused to function as a point setting means, a point environment determination means, a reception point determination means, and an output means.

  With this configuration, in the radio wave reception point surrounding environment determination program, first, the radio wave transmission point input by the information input means for inputting information and the position information regarding the radio wave reception point are input, and the geographic database is preliminarily input. The point setting means sets a plurality of determination points at a fixed distance and at a fixed interval from the radio wave reception point for the radio wave propagation line connecting the radio wave transmission point and the radio wave reception point based on the geographic information input to . Then, the point environment determination means determines the environment of the determination point based on the geographic information of the determination point and an environment determination condition indicating the environment of the determination point set in advance, and further, a reception point determination means Therefore, the surrounding environment of the radio wave reception point is determined based on the ratio of the environment of the determination point determined by the point environment determination unit and a preset surrounding environment threshold value. The determined result is output to display means such as a monitor via output means.

  According to the first, sixth, and seventh aspects of the present invention, since the surrounding environment of the radio wave reception point can be uniquely determined by a numerical definition, a correction coefficient when transmitting radio waves such as broadcast waves, etc. Can be set appropriately. Further, unlike the environment determination using only the radio wave reception point, the environment determination considering the actual radio wave propagation environment can be uniquely determined by a numerical definition. In addition, since the surrounding environment at the radio wave reception point can be uniquely determined by a numerical definition, the environment at a certain point, such as a car or ship navigation system or game software, is divided into, for example, the seaside or inland. Application to a field to be used separately is also possible. Furthermore, it becomes possible to make the measured value at the radio wave reception point and the calculated value on the desk as close as possible, and the reliability of the electric field calculation simulation can be increased. Further, since it is possible to determine how much the radio wave from overseas or the like has an influence on the radio wave reception point, it is possible to take defensive measures at the radio wave reception point.

According to the second and fourth aspects of the invention, it is possible to determine whether the surrounding environment is a seaside area or an inland area, or a suburban area, an urban area, or a large urban area. Thus, it is possible to appropriately determine a correction coefficient at the time of radio wave transmission that is greatly related to the attenuation amount.
According to the third aspect of the present invention, even if there are three or more environments of radio wave reception points to be determined, the environment of the radio wave reception points can be appropriately determined uniquely by a numerical definition.

  According to the fifth aspect of the present invention, the determination of the surrounding environment at the radio wave reception point can be uniquely determined by numerical definition after considering geographical factors in a wider range. In addition, as the surrounding environment at the radio wave reception point can be uniquely determined by numerical definition, the environment at a certain point, such as a car or ship navigation system or game software, is distinguished from the seaside or inland. Application to the field to do is also possible. Further, it is possible to perform electric field calculation simulation with higher reliability than the determination of only the line shape of the radio wave propagation line.

[Embodiment 1]
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a radio wave reception point surrounding environment determination apparatus.
As shown in FIG. 1, a radio wave reception point surrounding environment determination device (hereinafter referred to as “determination device”) 10 is an information input unit for inputting position information regarding a radio wave transmission point T and a radio wave reception point R using a keyboard 2 or the like. 1 and the position information input by the information input unit 1 and the geographical information stored in advance in the geographic database unit 4, the determination point P is determined in the radio wave propagation line L with respect to the radio wave transmission point T and the radio wave reception point R. A point setting unit 5 to be set, a determination unit 6 for determining the surrounding environment of the radio wave reception point R via the determination point P set by the point setting unit 5, and a determination result by the determination unit 6 on a monitor 8 or the like The output unit 7 for outputting to the display means is provided.

The information input unit 1 includes, for the position information regarding the radio wave transmission point T and the radio wave reception point R, an environment determination condition for determining the location, latitude / longitude, determination distance D, or environment at the determination point P, and environment determination This is because information related to the surrounding environment threshold value for determining the surrounding environment of the radio wave reception point R with respect to the condition ratio is input via the keyboard 2 or the GPS 3.
Note that the position information regarding the radio wave transmission point T and the radio wave reception point R is the geographical location of the radio wave transmission point T and the radio wave reception point R, such as the location (or latitude / longitude) input by the keyboard 2. Information that can specify the position is essential information. Further, the position information related to the radio wave transmission point T and the radio wave reception point R can include information that can specify the direction (for example, the direction) of the radio wave transmission point viewed from the radio wave reception point.

  The geographic database unit 4 is a storage means such as a computer hard disk, RAM, or ROM such as a computer hard disk or RAM or ROM in which geographic information is installed and converted into a database, as well as a CD-ROM storing geographic information, a drive for reading an optical disk, etc. Geographic information compiled by the Geospatial Information Authority of Japan is stored, and here, at least data corresponding to the topographic map M and the altitude above sea level is stored as the geographical information. The geographic information stored in the geographic database unit 4 is data corresponding to the topographical map M and the altitude above sea level compiled by the Geographical Survey Institute (sales of the Japan Map Center).

  The point setting unit 5 refers to the position information input to the information input unit 1 and the geographic information stored in the geographic database unit 4 to connect the radio wave transmission point T and the radio wave reception point R with a straight line. , And a predetermined number of determination points P at a constant distance and a fixed interval from the radio wave reception point R are set for the radio wave propagation line L. The state set by the point setting unit 5 is set to be displayed on the monitor 8 here. Note that the point setting unit 5 sets the number of determination points P, the determination distance D, and the like in a preset state, or a determination point that is input every time determination is made from the information input unit 1. The radio wave propagation line L may be set according to the number of P and the determination distance D.

For example, the determination distance D is set by a value obtained by multiplying the line-of-sight distance of 4.12 × [received height (m)] ^1/2 (km) by a weighting factor w (0 <w <1). Is. The set number and set interval of the determination distance D and the determination point P are set in advance here. Therefore, when the radio wave transmission point T and the radio wave reception point R are input, the radio wave is displayed on the screen of the monitor 8. The propagation line L is shown on the geographic data, and the determination points P (P1 to P12 (see FIG. 4)) are shown at regular intervals up to the determination distance D.

  Further, the set number and set interval of the determination points P can be appropriately changed depending on the type of radio wave to be propagated or the environment, and here, the resolution in which the regional environment in Japan and the geographic information to be used are created 1 to several times as a reference. As an example, since the resolution of the topographic map M to be used is 25 m mesh or 50 m mesh data, the set interval is set as 250 m. Further, the number of determination points P is set as an example here from the determination distance D and the set interval of the determination points P as an example.

  The determination unit 6 includes a point environment determination unit 6a that determines the environment of each determination point P based on an environment determination condition for determining an environment for each determination point P that is set in advance, and the point environment determination unit 6a. A reception point determination unit 6b that determines the surrounding environment of the radio wave reception point R based on the ratio of the determined points P for determination and the surrounding environment threshold p set in advance is provided.

  Further, the altitude determination condition used for the determination by the point environment determination unit 6a is the altitude above sea level, and here, the altitude above sea level = 0 m is set as the environment determination condition. Therefore, the point environment determination unit 6a determines whether or not the altitude above sea level = 0 m. Here, the determination result by the point environment determination unit 6a is displayed on the monitor 8 through the output unit 7 as the determination point P shown on the monitor as a white circle or a black circle.

  Further, the ambient environment threshold p used when the reception point determination unit 6b makes a determination is set in advance. The value of the ambient environment threshold p is determined by an empirical rule, or the radio wave transmission point T is previously determined. It is determined by performing a simulation for an area where the surrounding environment of the radio wave reception point R from is known. The surrounding environment threshold p is compared with a set value with respect to the ratio (value) of the environment at each determination point P determined by the point environment determination unit 6a, thereby determining the surrounding environment of the radio wave reception point R. It is for judging. In this case, the reception point determination unit 6b sets p = 0.5, for example, when the ratio of the environment at each determination point P is smaller than the surrounding environment threshold p, when it is a seaside (sea or seaside) region, or when it is large It is judged as an inland area. Note that the surrounding environment threshold p is p = 1 / A when it is determined as inland if it is “d” (km) away from the coastline and the determination distance D is a value obtained by multiplying “d” by A. (A> 1) may be determined. “D” at this time is obtained empirically. “D” shown here is set as 2 km as an example.

  The surrounding environment threshold p and the environment determination condition (altitude above sea level) may be set in advance, or may be set by the threshold setting unit 9 via the information input unit 1. is there. With the configuration set by the threshold setting unit 9, it is possible to make two or more determinations of the surrounding environment of the radio wave reception point R. Further, w used for the line-of-sight distance is determined based on actually measured sample data whose measurement results are known in advance.

  The output unit 7 is for outputting the determination results by the point environment determination unit 6 a and the reception point determination unit 6 b to the monitor 8. Finally, if even the determination of the surrounding environment of the radio wave reception point R is known and the result is sufficient, when the ambient environment threshold value p is exceeded only for the radio wave reception point R, for example, “white circle” is set. Furthermore, when it is below the surrounding environment threshold value p, for example, it may be configured to output to the monitor 8 via the output unit 7 as “black circle”. In addition, the output destination from the output unit 7 is shown here as the monitor 8, but any device that uses radio wave propagation that can use the determination result is targeted.

  As shown in FIG. 2, the monitor 8 has, for example, a radio wave transmission point (transmission point point) T, a radio wave reception point (reception point point) R, and a radio wave propagation that connects the transmission point point T and the reception point point R with a straight line. Radio wave propagation line L corresponding to, determination points P1 to P12 (a total of 13 points including the radio wave reception point R) set by the point setting unit 5 and arranged on the radio wave propagation line L, transmission point T and reception A topographic map M including the point point R is displayed.

Next, the operation of the determination apparatus 10 will be described with reference to FIG. FIG. 3 is a flowchart showing the flow of the radio wave reception point surrounding environment determination method.
(Step 1)
In step 1, position information regarding the radio wave transmission point (transmission point) T and radio wave reception point (reception point point) R, information regarding the determination distance D, and the like are input from the information input unit 1 via the keyboard 2 or the GPS 3. Note that the determination distance D in which the determination points P1 to P12 are arranged at regular intervals from the radio wave reception point R to the radio wave transmission point T in the topographic map M, the environment determination condition by the determination unit 6 (altitude above sea level = 0 m), and The basic information necessary for the seaside inland determination such as the surrounding environment threshold p is set or input in advance, and the process proceeds to Step 2.

At this time, the determination distance D is set based on previously measured data, data obtained based on experience, and the like. For example, the determination distance D is 4.12 × [reception height that is the line-of-sight distance from the radio wave reception point R. (M)] ^1/2 (km) is multiplied by a weighting factor w (0 <w <1).
In the first embodiment, the ambient environment threshold value p = 0.5, w = 0.2, the reception height 10 m, the determination distance D = 4.12 × [10] ^1/2 × 0.2 = about 2.60 km. The number of determination points is 13 (reception point point R + determination points P1 to P12), and the determination point interval is 0.2 km.

(Step 2)
In step 2, at least the data corresponding to the topographical map M and the altitude above sea level is read from the geographic database section 4 as essential information as geographical information compiled by the Geographical Survey Institute (sales of the Japan Map Center), etc. And migrate.

(Step 3)
In step 3, among the geographical information read in step 2, the topographic map M extracted based on the positional information on the radio wave transmission point T and the radio wave reception point R input in step 1 and the radio wave on the topographic map M are extracted. The transmission point T and the radio wave reception point R are displayed on the monitor 8. At the same time, with reference to the position information input in step 1 and the geographic information read in step 2, the setting of the radio wave propagation line L that connects the radio wave transmission point T and the radio wave reception point R with a straight line, and the monitor The radio wave propagation line L to 8 is displayed on the monitor. At the same time, the determination points P1 to P12 having a predetermined interval are set together with the radio wave reception point R so as to be disposed within the determination distance D on the radio wave propagation line L.

(Step 4)
In step 4, the point environment determination unit 6 a determines using the environment determination condition (altitude above sea level = 0 m), and the point display state for each determined type (for example, sea level altitude = 0 m is a black circle point, sea level altitude is not 0 m). Is displayed on the monitor. At the same time, in step 4, the ratio of the result determined by the point environment determination unit 6a for a total of 13 points P1 to P12 for determination and the radio wave reception point R set in step 3, The surrounding environment with respect to the radio wave reception point R is determined based on the surrounding environment threshold value p (p = 0.5) set in advance.

  That is, if it is determined that the ratio of the environment occupying the radio wave reception point R and each of the determination points P1 to P12 is a value that falls within the range of 0 to p, the process proceeds to step 5 and the surrounding environment of the radio wave reception point. Is determined to be a seaside area, and when it is determined that the value falls within the range of 1 from p, the process proceeds to step 6 and the surrounding environment of the radio wave reception point R is determined to be an inland area. Then, the process proceeds to step 7, and the results of step 5 or step 6 are output and displayed as numerical values or colors (white circles or black circles) on the monitor 8 which is the output target.

  Specifically, in the case of the monitor display of FIG. 2, since the altitude of altitude = 0 m is 11 and the altitude of altitude ≠ 0 m is 2 for the 13 determination points, the surrounding environment threshold p = 0. .5, that is, based on the ratio of which area is more than half, the actual radio wave receiving point R itself is located inland, but the surrounding environment in consideration of the arrival direction of the radio wave is the seaside area. It is determined that there is.

  Further, for example, when the state shown in FIG. 4 is reached, the sea level altitude = 0 m and the sea level altitude ≠ 0 m are 5 for the determination of 13 points. p = 0.5, that is, based on the ratio of which area is more than half, the actual radio wave receiving point R itself is located inland, but the surrounding environment in consideration of the direction of arrival of radio waves is Determined to be a seaside area. At this time, the determination point P8 has an altitude not higher than 0 m, but it is assumed that a small island or the like is located on the map corresponding to the determination point P8.

  Further, for example, when the state shown in FIG. 5 is reached, the sea level altitude = 0 m and the sea level altitude ≠ 0 m are 8 for the judgment point number of 13; p = 0.5, that is, based on the ratio of which region is more than half, assuming that the actual radio wave receiving point R is located behind the seaside, the surrounding environment considering the arrival direction of the radio wave is It is determined that it is an inland area.

  Further, for example, when the state as shown in FIG. 6 is obtained, the sea level altitude = 0 m and the sea level altitude ≠ 0 m are 8 with respect to 13 points for determination. p = 0.5, that is, based on the ratio of which area is more than half, the surrounding environment considering the arrival direction of the radio wave is determined to be an inland area.

  In the first embodiment, the surrounding environment of the radio wave reception point R is determined only by the arrival direction of the radio wave on the straight line connecting the radio wave transmission point T and the radio wave reception point R (only the radio wave propagation line L). For example, as shown in FIG. 7, a plurality of peripheral lines L2 to L5 are set linearly with a deflection angle for each predetermined angle θ around the radio wave reception point R with respect to the radio wave propagation line L, and the peripheral lines The determination may be made by setting the determination points P at the same number and the same interval as the radio wave propagation lines L every L2 to L5.

  That is, as shown in FIG. 1, a plurality of peripheral lines L <b> 2 to L <b> 5 (here, four lines) are set in the point setting unit 5 for each predetermined angle θ with respect to the radio wave propagation line L around the radio wave reception point R. The peripheral line setting unit 5a is provided. The peripheral line setting unit 5a sets the peripheral lines L2 to L5 and sets the determination point P for the peripheral lines L2 to L5 under the same conditions as the determination points P1 to P12 in the radio wave propagation line L. Is. In the peripheral line setting unit 5a, even if the number of peripheral lines and the value of the predetermined angle θ are input from the keyboard 2 via the information input unit 1, or the number of peripheral lines and the predetermined angle θ are previously set. A value may be set (± θ, ± 2θ from the radio wave propagation line L as the center line).

  The number of peripheral lines to be set is shown here as four, but it may be two, three, five or more, and even numbers from odd numbers. This is more convenient because it can be determined in the surrounding environment with a uniform width to the left and right of the radio wave propagation line L. Further, the value of the predetermined angle θ is set by the half width of the main lobe of the receiving antenna (not shown) at the radio wave receiving point R, or the angle width when considering propagation due to radio wave diffraction (considering the Fresnel zone). Is. Here, the value of the predetermined angle θ is set to 15 degrees as an example (for example, θ is set in a range of 45 degrees from 5 degrees to 1 degree).

  Then, as shown in FIG. 7, when the peripheral lines L2 to L5 are set, determination points P (a total of 61 points) are also set at the same time. After the determination via the point environment determination unit 6a according to the conditions, the ratio of all the determination points arranged on the radio wave propagation line L and the peripheral lines L2 to L5 is set as a predetermined peripheral environment threshold (p = 0). .5), the surrounding environment of the radio wave reception point R is comprehensively determined via the reception point determination unit 6b.

  In the case of the example shown in FIG. 7, the sea level altitude = 0m is 40 and the sea level altitude ≠ 0m is 21 for each determination point (61 in total). That is, based on the ratio of which area is more than half, the surrounding environment in consideration of the arrival direction of the radio wave is comprehensively determined as a seaside area, and the reliability of the seaside inland determination is improved.

  Note that when only one radio wave propagation line L (for example, FIG. 4) is used as in the first embodiment, in the illustrated example, the sea level altitude = 0 m is 6 and the sea level altitude is not 0 m = 7. Therefore, the surrounding environment threshold p = 0.5, that is, based on the ratio of which area is more than half, it is determined that the surrounding environment in consideration of the arrival direction of the radio wave is an inland area. The determination result may be different from the case where the peripheral lines L2 to L5 are used. As described above, in the case where different results are obtained for the same radio wave reception point R, here, in order to improve the reliability of the seaside inland determination, a determination result in which a peripheral line is set is employed.

  The factor for determining θ is determined by, for example, the half-value width of the main lobe of the receiving antenna, or the angular width (consideration of Fresnel zone) when propagation due to radio wave diffraction is considered. All of L2 to L5 are preferably equiangular.

[Embodiment 2]
8 to 12 show a second embodiment of the radio wave reception point surrounding environment determination device according to the present invention, and FIG. 8 is a front view of a monitor schematically showing a screen display example of the radio wave reception point ambient environment determination device. FIG. 9 is a flowchart for explaining a radio wave reception point ambient environment determination method, FIGS. 10 and 11 are explanatory diagrams for explaining examples of determination in the radio wave reception point ambient environment determination device, and FIG. 12 is a radio wave reception point ambient environment. It is explanatory drawing for demonstrating the application example of a determination apparatus.
The system block diagram shown in FIG. 1 of the first embodiment is used because it is apparently the same in the second embodiment, and the configuration already described will be omitted.

  As shown in FIG. 1, a radio wave reception point surrounding environment determination device 10 includes an information input unit 1 for inputting a radio wave transmission point T and a radio wave reception point R using a keyboard 2 and the like, a geographic database unit 4 storing geographic information, and A point setting unit 5, a peripheral line setting unit 5 a, a determination unit 6 including a point environment determination unit 6 a and a reception point determination unit 6 b, and an output unit 7 that outputs a determination result in the determination unit 6 to a monitor 8 or the like It has.

  The geographic database unit 4 stores, for example, geographic information compiled by the Geospatial Information Authority of Japan. Here, the data corresponding to the topographic map M and the altitude above sea level, and the land use data corresponding to the topographic map M are used. The land use data is obtained by classifying the land use classification into building land or other than building land every 50 m or 25 m mesh. Further, the land use data includes information such as whether or not the number of high-rise buildings (for example, the fifth floor or higher) is more than 50% for each mesh divided on the topographic map M.

  In the information input unit 1, in addition to position information regarding the radio wave transmission point T and the radio wave reception point R, information regarding urban environment determination and the like are input. The position information regarding the radio wave transmission point T and the radio wave reception point R is the radio wave transmission point T and the radio wave reception point such as the location (or latitude / longitude) input from the keyboard 2 or the latitude / longitude obtained from the GPS 3. This is information that can specify the geographical location of R. Further, the position information related to the radio wave transmission point T and the radio wave reception point R can include information that can specify the direction (for example, the direction) of the radio wave transmission point T viewed from the radio wave reception point R. Further, the information on the urban environment determination includes information such as a determination distance D and surrounding environmental thresholds p and q described later, and information that is a standard for classifying the urban environment at the radio wave reception point R into a suburban area and an urban area. It is a waste. The peripheral environment threshold values p and q may be set in advance by a threshold setting unit 9 described later.

  The threshold setting unit 9 is for setting the surrounding environment thresholds p and q, environment determination conditions (whether or not it is a building site in land use data), and the like via the information input unit 1 from the keyboard 2 or the like. Configured to be set. When determining the surrounding environment of the radio wave reception point R as three or more regions, the threshold setting unit 9 sets the number to be determined as n, and sets the surrounding environment threshold by dividing the numerical value obtained by n−1. ing. For example, when n = 3, 3-1 = 2, and the surrounding environment threshold is set in two sections by p and q.

  Note that the ambient environment threshold values p and q are determined by empirical rules, or determined in advance by performing a simulation for an area where the surrounding environment of the radio wave reception point R from the radio wave transmission point T is known. It is. The peripheral environment threshold values p and q (p = q <p <1, q = 0 <q <p) are compared with the ratio (value) at each determination point P determined by the point environment determination unit 6a. Thus, the surrounding environment of the radio wave reception point R is determined.

  Therefore, the reception point determination unit 6b is set here as p = 0.75 and q = 0.5. For example, when the ratio of the environment to each determination point P is smaller than the surrounding environment threshold q, the suburbs If the area exceeds the surrounding environment threshold value q and falls below the surrounding environment threshold value p, it is determined as an urban area, and if it is larger than the surrounding environment threshold value p, it is determined as a large city area.

  The environment determination condition used for determination by the point environment determination unit 6a is set to be a building site in the land use data or other than a building site. Therefore, the point environment determination unit 6a determines whether each determination point P is a building site or a building site in the state of each mesh corresponding to the topographic map M read from the geographic database unit 4. . The determination result by the point environment determination unit 6a is displayed on the monitor 8 through the output unit 7 as the determination point P as a white circle or a black circle here.

  As shown in FIG. 8, for example, the monitor 8 has a transmission point T corresponding to a radio wave transmission point, a reception point R corresponding to a radio wave reception point, and a transmission point T and a reception point R connected by a straight line. A radio wave propagation line L corresponding to radio wave propagation, a building ground block (for example, a black block) for each mesh of determination points P1 to P12, 50m or 25m set by the point setting unit 5 and arranged on the radio wave propagation line L ) And blocks other than the building site (for example, white blocks). In addition, in the display state for each mesh, although not shown in the figure, the grid is actually displayed on the topographic map M. Moreover, as shown in FIG. 8, you may display typically.

Next, the operation of the determination apparatus 10 will be described with reference to FIG. FIG. 9 is a flowchart showing a flow of the radio wave reception point surrounding environment determination method.
(Step 11)
In step 11, the position information regarding the radio wave transmission point T and the radio wave reception point R, the information regarding the urban environment determination, and the like are input from the information input unit 1 via the keyboard 2 or the GPS 3. In addition, the determination distance D in which the determination points P1 to P12 are arranged at regular intervals from the radio wave reception point R to the radio wave transmission point T in the topographic map M, the environment determination condition determined by the point environment determination unit 6a, Further, basic information necessary for city environment determination such as the surrounding environment threshold values p and q for determination by the reception point determination unit 6b is input, and the process proceeds to step 12.

At this time, the determination distance D is set by data measured in advance, and is, for example, 4.12 × [reception height (m)] ^1/2 (km which is the line-of-sight distance from the radio wave reception point R. ) Multiplied by a weighting factor w (0 <w <1).
In the second embodiment, the ambient environment threshold values p = 0.75, q = 0.5, w = 0.2, the reception height 10 m, the determination distance D = 4.12 × [10] ^1/2 × 0. 2 = about 2.60 km, number of determination points 13 (reception point point R + determination points P1 to P12), and determination point interval = 0.2 km.

(Step 12)
In step 12, as geographical information compiled by the Geospatial Information Authority of Japan (sales of the Japan Map Center) etc., data that classifies the land use classification into building land and non-building land for every 50m or 25m mesh as essential information The program is read from the geographic database unit 4 and proceeds to step 13.

(Step 13)
In step 13, the topographic map M extracted based on the positional information on the radio wave transmission point T and the radio wave reception point R input in step 11 among the geographical information read in step 12 and the topographic map M are displayed. The radio wave transmission point T and the radio wave reception point R are displayed on the monitor 8 with respect to the mesh. At the same time, the position information input in step 11 and the geographical information read out in step 12 are referred to set the radio wave propagation line L that connects the radio wave transmission point T and the radio wave reception point R with a straight line and to the monitor 8. The radio wave propagation line L is displayed on the monitor. At the same time, the determination points P1 to P12 are set together with the reception point R so as to be arranged within the determination distance D on the radio wave propagation line L.

(Step 14)
In step 14, based on the environment determination condition, the point environment determination unit 6a determines whether it is located on the building site block or on a block other than the building site, and the point display state (for example, for each determined type) The building site is displayed as a white circle point, and other than the building site as a black circle point). At the same time, in step 14, a total of 13 determined ratios of the plurality of radio wave reception points R determined by the point environment determination unit 6a and the respective determination points P1 to P12, and preset ambient environment threshold values p, Based on q, the surrounding environment of the radio wave reception point R is determined.

  That is, when the ratio of the environment occupying the radio wave reception point R and each of the determination points P1 to P12 is determined to be in the range of 0 to q, the process proceeds to step 15 and the surrounding environment of the radio wave reception point R is the suburb. When it is determined that the area is within the range from q to p, the process proceeds to step 16 where the surrounding environment of the radio wave reception point R is determined to be an urban area, and further from p to 1 If it is determined that the area is within the range, the process proceeds to step 17 where it is determined that the surrounding environment of the radio wave reception point R is a metropolitan area, and each process proceeds to step 18 where the results of steps 15 to 17 are obtained. Output to the output target.

Specifically, as shown in FIG. 8, in the case of a monitor display, since there are 7 building sites and 6 other than building sites with respect to 13 points for determination, the arrival direction of radio waves is determined. The considered surrounding environment is determined to be an urban area.
In addition, for example, when the state shown in FIG. 10 is reached, the number of points for determination is 13 and there are 6 building sites and 7 other than the building sites. The surrounding environment is determined to be a suburban area.
Furthermore, for example, when the state shown in FIG. 11 is reached, there are 10 building sites and 3 other sites than the building sites for 13 determination points. The surrounding environment is determined to be a large urban area.

  In the second embodiment described above, the surrounding environment of the radio wave reception point is determined only by the arrival direction of the radio wave connecting the radio wave transmission point T and the radio wave reception point R (only the radio wave propagation line L). As shown in FIG. 12, a plurality of peripheral lines L2 to L5 are set linearly with a deflection angle for each predetermined angle θ centered on the radio wave reception point R with respect to the radio wave propagation line L, and the peripheral lines L2 to L5 are set. Each determination may be made by setting determination points P at the same number and the same interval as the radio wave propagation lines L.

  That is, the peripheral line setting unit 5a of the point setting unit 5 sets a plurality of peripheral lines L2 to L5 (here, four lines) for each predetermined angle θ around the radio wave reception point R with respect to the radio wave propagation line L, And the determination point P is set with respect to the surrounding lines L2-L5 on the same conditions as the determination points P1-P12 in the radio wave propagation line L.

  Then, the point environment determination unit 6a determines each of the determination points P (a total of 61) according to the environment determination conditions set in advance, and then all of the points disposed on the radio wave propagation line L and the peripheral lines L2 to L5. The surrounding environment of the radio wave reception point R is comprehensively determined based on the determined ratio of the determination points P and the surrounding environment threshold values (p = 0.75, q = 0.5) set in advance.

As shown in FIG. 12, in this case, since there are 21 building sites and 40 other than the building sites for each judgment point (61 in total), its surroundings in consideration of the direction of arrival of radio waves The environment is comprehensively determined to be a suburban area, and the reliability of the urban environment determination is improved.
In addition, when only one radio wave propagation line L is used as in the second embodiment, since the number of building sites in the illustrated example is seven and the number other than the building sites is six, the arrival direction of radio waves is considered. The surrounding environment is determined to be an urban area, and the determination result may be different from the case where a plurality of lines are used. As described above, when different results are obtained for the same radio wave reception point R, here, a determination result in which a peripheral line is set is employed in order to improve the reliability of the urban environment determination.
The factor for determining θ is determined by, for example, the half-value width of the main lobe of the receiving antenna, or the angular width (consideration of Fresnel zone) when propagation due to radio wave diffraction is considered. All of L2 to L5 are preferably equiangular.

In each of the above-described embodiments, one is a transmission side and the other is a reception side. However, for convenience of explanation, the present invention is not limited to a system that can transmit and receive in only one direction, and is bidirectional. Of course, even in a wireless system capable of transmitting and receiving, it is possible to determine the surrounding environment for both electric field strengths. Further, the radio wave transmission point and the radio wave reception point are not limited to one region in Japan, for example, and may be a region in another country or a region straddling each country.
Further, the display state on the monitor 8 is such that the display around the radio wave reception point including the radio wave transmission point T is removed and the radio wave reception point R and the determination points P1 to P12 are enlarged and displayed in a range including all points. Switching is also possible.

In addition, since it is possible to determine the influence of radio waves from overseas at the radio wave reception point, for example, in the Kitakyushu region, it is possible to determine how much radio waves from neighboring countries may be received at the radio wave reception point For this reason, it is possible to take defensive measures such as changing the frequency at the radio wave reception point.
Furthermore, the environment determination condition of the determination point P is not particularly limited as long as it can be uniquely determined.
The radio wave reception point surrounding environment determination device 10 can be realized by causing a general computer to execute a program and operating an arithmetic device or a storage device in the computer. This program can be used via a communication line, distributed, or written on a recording medium such as a CD-ROM.

It is a block diagram in Embodiment 1 and 2 of the electromagnetic wave receiving point surrounding environment determination apparatus concerning this invention. It is a front view of the monitor for demonstrating the example of the screen display shown typically in Embodiment 1 of the electromagnetic wave receiving point periphery environment determination apparatus concerning this invention. It is a flowchart for demonstrating Embodiment 1 of the electromagnetic wave receiving point surrounding environment determination method concerning this invention. It is explanatory drawing for demonstrating the example 1 of determination in Embodiment 1 using the electromagnetic wave receiving point periphery environment determination apparatus concerning this invention. It is explanatory drawing for demonstrating the example 2 of determination in Embodiment 1 using the electromagnetic wave receiving point periphery environment determination apparatus concerning this invention. It is explanatory drawing for demonstrating the determination example 3 in Embodiment 1 using the electromagnetic wave receiving point periphery environment determination apparatus concerning this invention. It is explanatory drawing for demonstrating the application example of Embodiment 1 of the electromagnetic wave receiving point periphery environment determination apparatus concerning this invention. It is a front view of the monitor for demonstrating the example of a screen display in Embodiment 2 of the electromagnetic wave receiving point surrounding environment determination apparatus of this invention. It is a flowchart for demonstrating Embodiment 2 of the electromagnetic wave receiving point surrounding environment determination method concerning this invention. It is explanatory drawing for demonstrating the example 2 of determination in Embodiment 2 using the electromagnetic wave receiving point periphery environment determination apparatus concerning this invention. It is explanatory drawing for demonstrating the example 3 of determination in Embodiment 2 using the electromagnetic wave receiving point surrounding environment determination apparatus concerning this invention. It is explanatory drawing for demonstrating the application example of Embodiment 2 of the electromagnetic wave receiving point periphery environment determination apparatus concerning this invention.

Explanation of symbols

D Judgment distance (fixed distance)
L Radio wave propagation line P (P1 to P12) Judgment point p Ambient environment threshold q Ambient environment threshold R Radio reception point (reception point)
T Radio wave transmission point (transmission point)
1 Information input part 2 Keyboard 3 GPS
DESCRIPTION OF SYMBOLS 4 Geographic database part 5 Point setting part 5a Peripheral line setting part 6 Judgment part 6a Point environment judgment part 6b Reception point judgment part 7 Output part 8 Monitor 9 Threshold setting part 10 Radio wave reception point circumference environment judgment apparatus

Claims (7)

  An information input unit for inputting location information regarding a radio wave transmission point and a radio wave reception point, a geographic database unit storing geographic information, a radio wave transmission point and a radio wave reception point with reference to the location information and the geographic information. A point setting unit that sets a plurality of determination points at a fixed distance and a fixed interval from the radio wave reception point with respect to the radio wave propagation line to be connected, the geographic information at the determination point set by the point setting unit, and in advance A point environment determination unit that determines an environment of the determination point according to an environment determination condition for determining the environment of the set determination point, and an environment of the determination point that is determined by the point environment determination unit Based on the ratio and the surrounding environment threshold set in advance to determine the surrounding environment of the radio wave receiving point, A reception point determination unit determines the surroundings of the wave receiving point, the reception point determination of the determination result radio wave reception points surrounding environment determination apparatus characterized by comprising an output section for outputting. The information input unit receives at least the location or latitude / longitude of a radio wave transmission point and radio wave reception point as position information, and the geographic database unit has a topographic map and elevation above sea level corresponding to the topographic map as geographical information. Is stored,
The environmental judgment condition is determined by the altitude above sea level,
The radio wave reception point surrounding environment determination device according to claim 1, wherein the reception point determination unit determines whether a surrounding environment of the radio wave reception point is a seaside area or an inland area. A threshold setting unit configured to divide and set the surrounding environment threshold by the number obtained by n−1, where n is the number of surrounding environments when the surrounding environment of the radio wave reception point is determined to be three or more; ,
The reception point determination unit determines a surrounding environment of the radio wave reception point based on the surrounding environment threshold set by the threshold setting unit and a ratio of the environment of the determination point. The radio wave reception point surrounding environment determination device according to 1. The information input unit receives at least the location or latitude / longitude of a radio wave transmission point and radio wave reception point as position information, and the geographic database unit has a topographic map and land use data corresponding to the topographic map as geographical information. Is stored at least,
The land use data as geographic information stored in the geographic database section is two types of building land or other than building land,
The radio wave reception point surrounding environment determination device according to claim 3, wherein the reception point determination unit determines whether the surrounding environment of the radio wave reception point is a suburban area, an urban area, or a metropolitan area.   The point setting section sets a plurality of peripheral lines in a straight line at a predetermined angle of swing angle with respect to the radio wave propagation line, and the same number and the same as the radio wave propagation lines for each peripheral line. The radio wave receiving point surrounding environment determining apparatus according to any one of claims 1 to 4, further comprising a peripheral line setting unit that sets determination points at intervals. An input step for inputting position information relating to a radio wave transmission point and a radio wave reception point; and referring to position information relating to the radio wave transmission point and the radio wave reception point and pre-stored geographic information, the radio wave transmission point and the radio wave reception point A point setting step for setting a plurality of determination points at a predetermined distance and a fixed interval from the radio wave reception point with respect to the radio wave propagation line connecting the points, and the determination point in order to determine the environment of the determination point A point environment determination step for determining the environment of the determination point according to the geographical information and a preset environment determination condition, a ratio of the environment of the determination point determined in the point environment determination step, and A surrounding environment threshold set in advance to determine the surrounding environment of the radio wave reception point Based on, and includes a reception point determination step of determining the surrounding environment of the radio wave reception point, and an output step of outputting a judgment result of the surrounding environment in the radio wave reception point determined by said reception point determination step A method for determining the surrounding environment of a radio wave reception point, characterized in that: In order to determine the surrounding environment of the radio wave reception point based on the location information regarding the radio wave transmission point and the radio wave reception point input by the information input means for inputting information and the geographical information previously input in the geographic database Computer
Point setting means for setting a plurality of determination points at a constant distance and a fixed interval from the radio wave reception point with respect to the radio wave propagation line connecting the radio wave transmission point and the radio wave reception point;
Point environment determination means for determining the environment of the determination point based on the geographic information of the determination point set by the point setting means and an environment determination condition for determining the determination point set in advance;
The ambient environment of the radio wave reception point based on the environment ratio of the determination point determined by the point environment determination unit and the ambient environment threshold set in advance to determine the ambient environment of the radio wave reception point Receiving point determination means for determining
Output means for outputting the result of the surrounding environment at the radio wave reception point determined by the reception point determination means;
A function for determining the surrounding environment of a radio wave receiving point, characterized by functioning as

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