STATION POSITIONING SYSTEM, STATION POSITIONING DEVICE, STATION POSITIONING METHOD, AND STATION POSITIONING PROGRAM

1 . An installed station determination system that determines an installed station of a RIS reflector when an electromagnetic wave transmitted from a transmission point is relayed by reflection to a reception point in a reception area shielded by a line of sight,

the installed station determination system comprising:

ray tracing circuitry configured to perform ray tracing from the transmission point with respect to an area including an installed station candidate area of the RIS reflector including a set of a plurality of subdivided small areas;

first calculation circuitry configured to calculate propagation path power and a reflection point position of each propagation path that propagates an electromagnetic wave from the transmission point to the reception area in the line of sight after one reflection in the installed station candidate area on a basis of a result of the ray tracing performed by the ray tracing circuitry;

installed station area determination circuitry configured to determine the small area including the most reflection point positions calculated by the first calculation circuitry as an installed station area of the RIS reflector;

second calculation circuitry configured to calculate, for the installed station area determined by the installed station area determination circuitry, an incident angle of the propagation path having the maximum propagation path power calculated by the first calculation circuitry and a reflection angle from a center of gravity based on the reflection point position calculated by the first calculation circuitry to the reception area; and

output circuitry configured to output the installed station area determined by the installed station area determination circuitry and values indicating the incident angle and the reflection angle calculated by the second calculation circuitry.

2 . The installed station determination system according to claim 1 , wherein

the second calculation circuitry include

calculating a reflection angle to a center of gravity of the reception area or a reflection angle to an arbitrary reception point in the reception area.

3 . The installed station determination system according to claim 1 , wherein

the second calculation circuitry include

using a geometric center or a geometric center weighted according to the propagation path power as the center of gravity.

4 . An installed station determination device that determines an installed station of a RIS reflector when an electromagnetic wave transmitted from a transmission point is relayed by reflection to a reception point in a reception area shielded by a line of sight,

the installed station determination device comprising:

first calculation circuitry configured to calculate, on a basis of a ray tracing result obtained by performing ray tracing from the transmission point with respect to an area including an installed station candidate area of the RIS reflector including a set of a plurality of subdivided small areas, propagation path power and a reflection point position of each propagation path that propagates an electromagnetic wave from the transmission point to the reception area in the line of sight after one reflection in the installed station candidate area;

installed station area determination circuitry configured to determine the small area including the most reflection point positions calculated by the first calculation circuitry as an installed station area of the RIS reflector;

second calculation circuitry configured to calculate, for the installed station area determined by the installed station area determination circuitry, an incident angle of the propagation path having the maximum propagation path power calculated by the first calculation circuitry and a reflection angle from a center of gravity based on the reflection point position calculated by the first calculation circuitry to the reception area; and

output circuitry configured to output the installed station area determined by the installed station area determination circuitry and values indicating the incident angle and the reflection angle calculated by the second calculation circuitry.

5 . The installed station determination device according to claim 4 , wherein

the second calculation circuitry include

calculating a reflection angle to a center of gravity of the reception area or a reflection angle to an arbitrary reception point in the reception area.

6 . The installed station determination device according to claim 4 , wherein

the second calculation circuitry include

using a geometric center or a geometric center weighted according to the propagation path power as the center of gravity.

7 . An installed station determination method for determining an installed station of a RIS reflector when an electromagnetic wave transmitted from a transmission point is relayed by reflection to a reception point in a reception area shielded by a line of sight,

the installed station determination method comprising:

performing ray tracing from the transmission point with respect to an area including an installed station candidate area of the RIS reflector including a set of a plurality of subdivided small areas;

first calculating propagation path power and a reflection point position of each propagation path that propagates an electromagnetic wave from the transmission point to the reception area in the line of sight after one reflection in the installed station candidate area on a basis of a result of the ray tracing performed in performing ray tracing;

determining the small area including the most reflection point positions calculated in first calculating as an installed station area of the RIS reflector;

calculating, for the installed station area determined in determining, an incident angle of the propagation path having the maximum propagation path power calculated in first calculating and a reflection angle from a center of gravity based on the reflection point position calculated in first calculating to the reception area; and

outputting the installed station area determined in determining and values indicating the incident angle and the reflection angle calculated in second calculating.

8 . A non-transitory computer-readable storage medium storing an installed station determination program for causing a computer to function as each circuitry of the installed station determination device according to claim 4 .