RADIO WAVE CONDITION OUTPUT DEVICE, RADIO WAVE CONDITION OUTPUT METHOD, AND RADIO WAVE CONDITION OUTPUT PROGRAM
A radio wave status output device has: a measurement circuitry that measure each reception power or a C/N value of a radio wave received; an angle measurement circuitry that measure each an azimuth angle and an elevation angle of the directional antenna; a calculation circuitry that calculate an approximate curved surface corresponding to each the reception power or C/N value at a position of each of the plurality of different points on an X-Y plane, respectively, and that the reception power or the C/N value measured is a value of a Z-axis; and an extraction circuitry that extract, from the approximate curved surface calculated, a range on the X-Y plane in which the value of the Z-axis is equal to or greater than a predetermined threshold.
1 . A radio wave status output device comprising:
measurement circuitry configured to measure, in a case where a directional antenna is directed to each of a plurality of different points positioned on a plane orthogonal to a reference straight line extending in a horizontal direction, each reception power or a C/N value of a radio wave received by the directional antenna;
angle measurement circuitry configured to measure an azimuth angle and an elevation angle of the directional antenna in a case where the directional antenna is directed to each of the plurality of different points;
calculation circuitry configured to calculate an approximate curved surface corresponding to either the reception power or C/N value at a position of each of the plurality of different points on an X-Y plane, based on an assumption that the azimuth angle and the elevation angle measured by the angle measurement circuitry with respect to each of the plurality of different points are a value of an X-axis and a value of a Y-axis, respectively, and that the reception power or the C/N value measured by the measurement circuitry is a value of a Z-axis;
extraction circuitry configured to extract, from the approximate curved surface calculated by the calculation circuitry, a range on the X-Y plane in which the value of the Z-axis is equal to or greater than a predetermined threshold; and
output circuitry configured to output the range on the X-Y plane extracted by the extraction circuitry.
2 . The radio wave status output device according to claim 1 ,
wherein the threshold is determined based on reception power or a C/N value of a radio wave received by an omni antenna disposed in the vicinity of the directional antenna.
3 . The radio wave status output device according to claim 1 ,
wherein the extraction circuitry extract on the X-Y plane in which the value of the Z-axis is equal to or greater than each of a plurality of thresholds.
4 . The radio wave status output device according to claim 1 ,
wherein the output circuitry output the range on the X-Y plane in which the value of the Z-axis is equal to or greater than a predetermined threshold by displaying it in a color different from that of other ranges.
5 . A radio wave status output method comprising:
measuring, in a case where a directional antenna is directed to each of a plurality of different points positioned on a plane orthogonal to a reference straight line extending in a horizontal direction, each reception power or a C/N value of a radio wave received by the directional antenna;
measuring an azimuth angle and an elevation angle of the directional antenna in a case where the directional antenna is directed to each of the plurality of different points;
calculating an approximate curved surface corresponding to either the reception power or C/N value at a position of each of the plurality of different points on an X-Y plane, based on an assumption that the azimuth angle and the elevation angle measured with respect to each of the plurality of different points are a value of an X-axis and a value of a Y-axis, respectively, and that the reception power or the C/N value measured is a value of a Z-axis;
extracting, from the calculated approximate curved surface, a range on the X-Y plane in which the value of the Z-axis is equal to or greater than a predetermined threshold; and
outputting the extracted range on the X-Y plane.
6 . The radio wave status output method according to claim 5 ,
wherein the threshold is determined based on reception power or a C/N value of a radio wave received by an omni antenna disposed in the vicinity of the directional antenna.
7 . The radio wave status output method according to claim 5 ,
wherein, in extracting, ranges on the X-Y plane in which the value of the Z-axis is equal to or greater than each of a plurality of thresholds are extracted.
8 . A non-transitory computer-readable storage medium storing a radio wave status output program for causing a computer to function as each circuitry of the radio wave status output device according to claim 1 .