Information processing system, ray tracing method, and program for radio wave propagation simulation
An information processing system includes: a first ray tracing unit configured to determine a two-dimensional ray trace from a transmission point at which a radio wave is transmitted, to a reception point at which the radio wave is received; a second ray tracing unit configured to determine a three-dimensional ray trace corresponding to the two-dimensional ray trace, using height information about the transmission point and the reception point; and a radio field intensity calculation unit that calculates the intensity of the radio wave at the reception point, using one or more three-dimensional ray traces determined by the second ray tracing unit.
1 . An information processing system comprising:
a processor configured to
determine a two-dimensional ray trace from a transmission point at which a radio wave is transmitted, to a reception point at which the radio wave is received;
determine a three-dimensional ray trace corresponding to the two-dimensional ray trace, using height information about the transmission point and the reception point;
calculate an intensity of the radio wave at the reception point, using one or more three-dimensional ray traces determined, and
determine a diffracted ray in the three-dimensional ray trace with replacing a structural object present between the transmission point and the reception point with a flat metal plate when there is no line of sight in a route between the transmission point and the reception point.
2 . The information processing system according to claim 1 , wherein
the processor is further configured to
determine the two-dimensional ray trace from the transmission point at which the radio wave is transmitted in a building to the reception point at which the radio wave is received in the building, using environment data indicating a structural object present in the building and the inside of the building, and
determine the three-dimensional ray trace corresponding to the two-dimensional ray trace, using height information about the transmission point and the reception point, and the environment data.
3 . The information processing system according to claim 1 , wherein the processor is further configured to determine the two-dimensional ray trace within a range of a predetermined number of transmissions, a predetermined number of reflections, and a predetermined number of diffractions.
4 . The information processing system according to claim 1 , wherein the processor is further configured to determine the two-dimensional ray trace with limiting a route from the transmission point to the reception point via a structural object, to a route from the transmission point to the reception point via a structural object having a line of sight from the transmission point or the reception point.
5 . The information processing system according to claim 1 , wherein the processor is further configured to, when determining one of a reflected ray or a diffracted ray in the three-dimensional ray trace, determine the one of the reflected ray or the diffracted ray with restricting a launch angle of ray launching.
6 . The information processing system according to claim 1 , wherein the processor is further configured to, when there is a plurality of objects between the transmission point and the reception point, determine the diffracted ray, using a Bullington model.
7 . The information processing system according to claim 1 , wherein
the processor is further configured to
determine the two-dimensional ray trace from the transmission point to the reception point in a vertical plane, when there is not a line of sight from the transmission point to the reception point in a two-dimensional ray trace from the transmission point to the reception point in a horizontal plane, and
determine that there is not a line of sight in the route between the transmission point and the reception point, when there is not a line of sight from the transmission point to the reception point in the two-dimensional ray trace in the vertical plane.
8 . A ray trace method comprising:
determining a two-dimensional ray trace from a transmission point at which a radio wave is transmitted, to a reception point at which the radio wave is received;
determining a three-dimensional ray trace corresponding to the two-dimensional ray trace, using height information about the transmission point and the reception point;
calculating an intensity of the radio wave at the reception point, using one or more three-dimensional ray traces determined; and
determine a diffracted ray in the three-dimensional ray trace with replacing a structural object present between the transmission point and the reception point with a flat metal plate when there is no line of sight in a route between the transmission point and the reception point,
wherein the determining a two-dimensional ray trade, the determining a three-dimensional ray trance, and the calculating an intensity of the radio wave are performed by an information processing system.
9 . A computer-readable non-transitory recording medium storing a program for causing an information processing system to:
determine a two-dimensional ray trace from a transmission point at which a radio wave is transmitted, to a reception point at which the radio wave is received;
determine a three-dimensional ray trace corresponding to the two-dimensional ray trace, using height information about the transmission point and the reception point;
calculate an intensity of the radio wave at the reception point, using one or more three-dimensional ray traces determined in the second ray tracing process, and
determine a diffracted ray in the three-dimensional ray trace with replacing a structural object present between the transmission point and the reception point with a flat metal plate when there is no line of sight in a route between the transmission point and the reception point.