Propagation environment estimation method propagation environment estimation system and propagation environment estimation device
The present disclosure relates to a propagation environment estimation method suitable for environment estimation of a wireless signal using a scale model. The scale model is created. In the scale model, a light source regarded as a transmission station of a radio wave is installed. In the scale model, a light receiving element regarded as a receiver of the radio wave is installed. The light source irradiates a measurement range set in the scale model, and the light receiving element measures a light reception level. Data of the light reception level acquired in the previous step is converted into a reception level of the radio wave.
1 . A propagation environment estimation method for estimating a propagation environment of a radio wave using a scale model, the propagation environment estimation method comprising:
creating a scale model;
installing, in the scale model, a light source regarded as a transmission station of a radio wave and a light receiving element regarded as a receiver;
irradiating a measurement range in the scale model by the light source;
measuring, by the light receiving element, a light reception level of the measurement range irradiated by the light source; and
calibrating, by converting data of the light reception level obtained by the measurement into a reception level of the radio wave,
wherein the calibrating includes calibrating the data of the light reception level on a basis of an attenuation characteristic of the radio wave corresponding to a propagation distance in a target area.
2 . The propagation environment estimation method according to claim 1 , further comprising: setting a scale of the scale model prior to the creation of the scale model,
the setting of said scale including
acquiring information regarding installation spaces of the transmission station and the receiver in a target area,
acquiring dimensions of the light source and the light receiving element, and
setting the scale such that the light source and the light receiving element are accommodated in corresponding portions of the installation space in the scale model.
3 . The propagation environment estimation method according to claim 1 , further comprising: setting a scale of the scale model prior to the creation of the scale model,
the setting of said scale including
acquiring information of a range in which a propagation environment of the radio wave is to be measured in a target area,
recognizing a portion of the scale model, the portion corresponding to the range, as the measurement range,
acquiring information of an irradiation range by the light source, and
setting the scale such that the measurement range falls within the irradiation range.
4 . The propagation environment estimation method according to claim 1 , further comprising: applying reflection treatment to at least a part of the scale model such that a light reflectance in the scale model matches a radio wave reflectance in a target area.
5 . The propagation environment estimation method according to claim 1 , further comprising: setting a wavelength of light emitted from the light source on a basis of a frequency of the radio wave assumed to be used in a target area such that a behavior of light in the scale model matches a behavior of the radio wave in the target area.
6 . The propagation environment estimation method according to claim 1 , wherein
the calibrating further includes
acquiring an attenuation characteristic of light emitted from the light source in the scale model, and
calibrating the data of the light reception level on a basis of the attenuation characteristic of the radio wave and the attenuation characteristic of the light.
7 . A propagation environment estimation system that estimates a propagation environment of a radio wave using a scale model, the propagation environment estimation system comprising:
a 3D printer that creates a scale model;
an element mounter that installs, in the scale model, a light source regarded as a transmission station of a radio wave and a light receiving element regarded as a receiver; and
a controller that causes the light source to irradiate a measurement range in the scale model and causes the light receiving element to measure a light reception level, wherein
the controller is configured to execute calibration treatment of converting data of the light reception level obtained by the measurement into a reception level of the radio wave, the calibration treatment including calibrating the data of the light reception level on a basis of an attenuation characteristic of the radio wave corresponding to a propagation distance in a target area.
8 . A propagation environment estimation device that estimates a propagation environment of a radio wave using a scale model, the propagation environment estimation device comprising:
a 3D printer that creates a scale model;
an element mounter that installs, in the scale model, a light source regarded as a transmission station of a radio wave and a light receiving element regarded as a receiver; and
a controller that causes the light source to irradiate a measurement range in the scale model and causes the light receiving element to measure a light reception level, wherein
the controller is configured to execute calibration treatment of converting data of the light reception level obtained by the measurement into a reception level of the radio wave, the calibration treatment including calibrating the data of the light reception level on a basis of an attenuation characteristic of the radio wave corresponding to a propagation distance in a target area.
9 . The propagation environment estimation method according to claim 2 , further comprising: applying reflection treatment to at least a part of the scale model such that a light reflectance in the scale model matches a radio wave reflectance in a target area.
10 . The propagation environment estimation method according to claim 3 , further comprising: applying reflection treatment to at least a part of the scale model such that a light reflectance in the scale model matches a radio wave reflectance in a target area.
11 . The propagation environment estimation method according to claim 2 , further comprising: setting a wavelength of light emitted from the light source on a basis of a frequency of the radio wave assumed to be used in a target area such that a behavior of light in the scale model matches a behavior of the radio wave in the target area.
12 . The propagation environment estimation method according to claim 3 , further comprising: setting a wavelength of light emitted from the light source on a basis of a frequency of the radio wave assumed to be used in a target area such that a behavior of light in the scale model matches a behavior of the radio wave in the target area.
13 . The propagation environment estimation method according to claim 9 , further comprising: setting a wavelength of light emitted from the light source on a basis of a frequency of the radio wave assumed to be used in a target area such that a behavior of light in the scale model matches a behavior of the radio wave in the target area.
14 . The propagation environment estimation method according to claim 10 , further comprising: setting a wavelength of light emitted from the light source on a basis of a frequency of the radio wave assumed to be used in a target area such that a behavior of light in the scale model matches a behavior of the radio wave in the target area.
15 . The propagation environment estimation method according to claim 2 , wherein
the calibrating further includes
acquiring an attenuation characteristic of light emitted from the light source in the scale model, and
calibrating the data of the light reception level on a basis of the attenuation characteristic of the radio wave and the attenuation characteristic of the light.
16 . The propagation environment estimation method according to claim 3 , wherein
the calibrating further includes
acquiring an attenuation characteristic of light emitted from the light source in the scale model, and
calibrating the data of the light reception level on a basis of the attenuation characteristic of the radio wave and the attenuation characteristic of the light.
17 . The propagation environment estimation method according to claim 9 , wherein
the calibrating further includes
acquiring an attenuation characteristic of light emitted from the light source in the scale model, and
calibrating the data of the light reception level on a basis of the attenuation characteristic of the radio wave and the attenuation characteristic of the light.
18 . The propagation environment estimation method according to claim 11 , wherein
the calibrating further includes
acquiring an attenuation characteristic of light emitted from the light source in the scale model, and
calibrating the data of the light reception level on a basis of the attenuation characteristic of the radio wave and the attenuation characteristic of the light.
19 . The propagation environment estimation method according to claim 13 , wherein
the calibrating further includes
acquiring an attenuation characteristic of light emitted from the light source in the scale model, and
calibrating the data of the light reception level on a basis of the attenuation characteristic of the radio wave and the attenuation characteristic of the light.
20 . The propagation environment estimation method according to claim 14 , wherein
the calibrating further includes
acquiring an attenuation characteristic of light emitted from the light source in the scale model, and
calibrating the data of the light reception level on a basis of the attenuation characteristic of the radio wave and the attenuation characteristic of the light.